Instruction Book

High Speed Separator

VNPX 710SGD-34GL

Product No. 881150-01-03/4

Book No. 1270109-02 Rev. 7
Alfa Laval Tumba AB
Separator Manuals, dept. PPDM
SE-147 80 Tumba, Sweden
Telephone: +46 8 530 650 00
Telefax: +46 8 530 310 40
Printed in Sweden, 05-05

© Alfa Laval Tumba AB 2005

This publication or any part thereof may not be
reproduced or transmitted by any process or
means without prior written permission of
Alfa Laval Tumba AB.
Contents
1 Safety Instructions 9

1.1 Warning signs in text 14

1.2 Environmental issues 15
1.3 Requirements of personnel 16

2 Technical description 17

2.1 Application 18
2.2 Design 18
2.3 Separation process, main parts and function 19
2.4 Mechanical power transmission, main parts
and function 25
2.5 Sensors and indicators 26

3 Operating Instructions 29

3.1 Before start 30

3.2 Start and run-up 31
3.3 Separation 32
3.4 Cleaning 32
3.5 Stop 33
3.6 Emergency stop 34

4 Trouble tracing 35

4.1 VNPX separating function 36

4.2 Separator mechanical functions 39

5 Maintenance general 43

5.1 Periodic maintenance 44

5.2 Maintenance schedule 46
5.3 Oil change in worm gear housing 56
5.4 Miscellaneous maintenance 58

3
6 Dismantling/Assembly 59

6.1 General information 60

6.2 Exploded views 61
6.3 Dismantling 67
6.4 Assembly 87
6.5 Exchange of brake lining 112
6.6 Exchange of coupling pads 114
6.7 Lifting and transport instruction 115
6.8 Exchange of frame feet 116
6.9 Vibration sensor 117
6.10 Speed sensor 118

7 Check points 121

7.1 IS - Intermediate service 122

7.2 Worm wheel and worm 127
7.3 Guiding surfaces 129
7.4 Spindle top and bowl body nave 132
7.5 Discharge mechanism 133
7.6 Bowl sealings 134
7.7 Threads of lock ring and bowl hood 136
7.8 Wear liners 138
7.9 Threads of inlet pipe, threads of paring disc 139
7.10 Friction coupling 140
7.11 Radial wobble of bowl spindle 141
7.12 Radial wobble of worm wheel shaft 142
7.13 Radial wobble of motor shaft 143
7.14 Ball bearing housing 143
7.15 Height position of operating water device 143
7.16 Priming of large lock ring 144
7.17 Disc stack pressure 146
7.18 Height position of paring disc 147

4
8 Technical References 149

8.1 Product desription 150

8.2 Technical data 151
8.3 Paring disc capacity 153
8.4 PX Sealing diagram 154
8.5 Drawings 156
8.6 Interconnection diagram 168
8.7 Demand specification, service water 174
8.8 Demand specification, compressed air 175
8.9 Identification and safety signs on machine 176

9 Installation 179

9.1 General information 180

9.2 Storage and transport of goods 181
9.3 Service space 183
9.4 Foundation 184

5
6
Study instruction manuals and observe the
warnings before installation, operation,
service and maintenance.

Not following the instructions can result in

serious accidents.

In order to make the information clear only foreseeable conditions

have been considered. No warnings are given, therefore, for
situations arising from the unintended usage of the machine and its
tools.

7
8
1 Safety Instructions

The centrifuge includes parts that rotate at high

speed. This means that:
• Kinetic energy is high
• Great forces are generated
•

G0010421
Stopping time is long

Manufacturing tolerances are extremely fine.

Rotating parts are carefully balanced to reduce
undesired vibrations that can cause a breakdown.
Material properties have been considered
carefully during design to withstand stress and
fatigue.
The separator is designed and supplied for a
specific separation duty (type of liquid, rotational
speed, temperature, density etc.) and must not be
used for any other purpose.
Incorrect operation and maintenance can result in
unbalance due to build-up of sediment, reduction
of material strength, etc., that subsequently could
lead to serious damage and/or injury.
The following basic safety instructions therefore
apply:
• Use the separator only for the purpose
and parameter range specified by
Alfa Laval.
• Strictly follow the instructions for
installation, operation and maintenance.
• Ensure that personnel are competent and
have sufficient knowledge of maintenance
and operation, especially concerning
emergency stopping procedures.
S0151211

• Use only Alfa Laval genuine spare parts

and the special tools supplied.

9
 1 Safety Instructions

Disintegration hazards

• When power cables are connected,

always check direction of motor rotation.
If incorrect, vital rotating parts could
unscrew.

S01512F1
• If excessive vibration occurs, stop
separator and keep bowl filled with
liquid during rundown.

S01512N1
• Use the separator only for the purpose
and parameter range specified by
Alfa Laval.

S01512P1
• Check that the gear ratio is correct for
power frequency used. If incorrect,
subsequent overspeed may result in a
serious break down.

• Welding or heating of parts that rotate S01512L1

can seriously affect material strength.

S0151241

• Wear on the large lock ring thread must

not exceed safety limit. φ-mark on lock
ring must not pass opposite φ-mark by
more than specified distance.
S01512G1

• Inspect regularly for corrosion and

erosion damage. Inspect frequently if
process liquid is corrosive or erosive.
S01512H1

10
1 Safety Instructions

Entrapment hazards

• Make sure that rotating parts have come

to a complete standstill before starting
any dismantling work.

S01512O1
• To avoid accidental start, switch off and
lock power supply before starting any
dismantling work.

S0151261
Assemble the machine completely
before start. All covers and guards must
be in place.

Electrical hazard

• Follow local regulations for electrical

installation and earthing (grounding).
• To avoid accidental start, switch off and

S0151271
lock power supply before starting any
dismantling work.

Crush hazards

• Use correct lifting tools and follow lifting

instructions.
S01512M1

Do not work under a hanging load.

S01512Y1

11
 1 Safety Instructions

Noise hazards

• Use ear protection in noisy

environments.

S0151291
Burn hazards

• Lubrication oil and various machine

surfaces can be hot and cause burns.

S01512A1
Skin irritation hazards

• When using chemical cleaning agents,

make sure you follow the general rules
and suppliers recommendation
regarding ventilation, personnel S01512D1

protection etc.
• Use of lubricants in various situations.

12
1 Safety Instructions

Cut hazards

• Sharp edges on bowl discs and threads

can cause cuts.

S01512B1
Flying objects

• Risk for accidental release of snap rings

and springs when dismantling and
assembly.

S01512C1
Health hazard

• Risk for unhealthy dust when handling

friction blocks/pads. Use a dust mask to
make sure not to inhale any dust.

S01512V1

13
 1 Safety Instructions

1.1 Warning signs in text

Pay attention to the safety instructions in this
manual. Below are definitions of the three grades
of warning signs used in the text where there is a
risk for injury to personnel.

DANGER

Type of hazard

DANGER indicates an imminently

hazardous situation which, if not avoided,
will result in death or serious injury.

WARNING

Type of hazard

WARNING indicates a potentially

hazardous situation which, if not avoided,
could result in death or serious injury.

CAUTION

Type of hazard

CAUTION indicates a potentially

hazardous situation which, if not avoided,
may result in minor or moderate injury.

NOTE
NOTE indicates a potentially hazardous
situation which, if not avoided, may result
in property damage.

14
1 Safety Instructions

1.2 Environmental issues

Unpacking
Packing material consists of wood, plastics,
cardboard boxes and in some cases metal straps.
Wood and cardboard boxes can be reused,
recycled or used for energy recovery.
Plastics should be recycled or burnt at a licensed
waste incineration plant.
Metal straps should be sent for material recycling.

Maintenance
During maintenance oil and wear parts in the
machine are replaced.
Oil must be taken care of in agreement with local
regulations.
Rubber and plastics should be burnt at a licensed
waste incineration plant. If not available they
should be disposed to a suitable licensed land fill
site.
Bearings and other metal parts should be sent to
a licensed handler for material recycling.
Seal rings and friction linings should be disposed
to a licensed land fill site. Check your local
regulations.
Worn out or defected electronic parts should be
sent to a licensed handler for material recycling.

15
 1 Safety Instructions

1.3 Requirements of
personnel
Only skilled or instructed persons are allowed to
operate the machine, e.g. operating and
maintenance staff.
• Skilled person: A person with technical
knowledge or sufficient experience to enable
him or her to perceive risks and to avoid
hazards which electricity/mechanics can
create.
• Instructed person: A person adequately
advised or supervised by a skilled person to
enable him or her to perceive risks and to
avoid hazards which electricity/mechanics
can create.
In some cases special skilled personnel may
need to be hired, like electricians and others. In
some of these cases the personnel has to be
certified according to local regulations with
experience of similar types of work.

16
2 Technical description

Contents
2.1 Application 18

2.2 Design 18

2.3 Separation process, main parts and

function 19
2.3.1 Inlet and outlet device 20
2.3.2 Separator bowl and sludge discharge
mechanism 21
2.3.3 Cyclone 21
2.3.4 Separating function 22
2.3.5 Sludge discharge function 23
2.3.6 Flushing water function 24
2.3.7 Cooling system function 24
2.3.8 Liquid seal in paring chamber 24

2.4 Mechanical power transmission,

main parts and function 25

2.5 Sensors and indicators 26

17
2.1 Application 2 Technical description

2.1 Application
The VNPX 710SGD-34GL is a high-speed
centrifugal separator for cleaning of wine and
wine must. It is a clarifier type of separator with
partial sludge discharge.
The separator must be installed together with
equipment for control and monitoring of the
separation process.

WARNING

Disintegration hazards

Never use the separator for separating other

liquids or liquids with other characteristics

G0256611
than originally specified. If your requirements
change, always consult Alfa Laval
representative before any changes are
made.

2.2 Design
The separator comprises a processing part and a
driving part. It is driven by an electric motor.
Mechanically, the separator machine frame is
composed of a bottom part, a top part and a
frame hood. The motor is flanged to the frame as
shown in the picture. The frame feet are vibration
damping.
The bottom part of the separator contains the
power transmission: a horizontal drive shaft with
coupling, a worm gear and a vertical spindle.
The bottom part also contains an oil bath for the
worm gear, a brake and a revolution counter.
G0256811

The frame top part and the frame hood contain

the processing parts of the separator, inlet, outlet
and piping. A. Electric motor
B. Friction coupling
The liquid is cleaned in the separator bowl. This is C. Worm gear
fitted on the upper part of the vertical spindle and D. Bowl spindle
rotates at a high speed in the space formed by E. Bowl
the frame top part and frame hood. The bowl also F. Inlet/Outlet device
G. Oil bath
contains the discharge mechanism which empties
H. Brake
the bowl of sludge.
I. Revolution counter

18
2 Technical description 2.3 Separation process, main parts and function

2.3 Separation process,

main parts and
function
The separation process takes place in the rotating
bowl, which is driven by the motor via the worm
gear transmission.
Unseparated liquid is fed to the bowl through the
inlet. The liquid is cleaned in the bowl and leaves
the separator through the outlet via a paring-disc
pump. Impurities heavier than the liquid are
collected in the sludge space in the bowl
periphery. The sludge is discharged at intervals
through ports in the bowl wall to the sludge outlet.
Permissible pressures and working conditions are
specified in the ‘‘8 Technical References” on page
149.
The processing parts of the separator are shown
in the adjacent picture, where the rotating parts
have a darker shadow.
There are no contacting surfaces between
rotating parts (the bowl) and stationary parts
(inlet, outlet, feed devices), the interfacing
surfaces are not sealed. Since the separation

G0256711
process is carefully balanced regarding pressures
and fluid levels, leakages do not occur as long as
the appropriate running conditions are fulfilled.

19
2.3 Separation process, main parts and function 2 Technical description

2.3.1 Inlet and outlet device

The inlet and outlet device consist of the following
parts:
• The inlet. This comprises the pipe bend and
the long inlet pipe which ends in the middle of
the bowl.
• The outlet. This comprises the discharge
cover and the paring disc, which pumps the
separated liquid out of the bowl. The paring
disc is located in the paring chamber in the
top of the bowl.
The inlet and outlet device is held together by the
inlet pipe threading which is fixed to the paring
disc. O-rings and a seal ring seal the connections
between the parts.
The outlet connection housing is tightened to the
separator frame hood. Height adjusting rings
determine the height position of the paring disc in

G0299311
the paring chamber.
Inlet and outlet device
a. Inlet pipe
b. Outlet connection housing
c. Paring disc
Separator bowl
d. Paring chamber cover
e. Bowl hood
f. Large lock ring
g. Bowl body
h. Distributing cone
i. Distributor, disc inlet
j. Disc stack
Discharge mechanism
k. Sliding bowl bottom
l. Operating slide
m. Dosing ring
n. Operating water device

20
2 Technical description 2.3 Separation process, main parts and function

2.3.2 Separator bowl and sludge

discharge mechanism
The separator bowl with the sludge discharge
mechanism is built-up as follows:
The bowl body and bowl hood are held together
by the large lock ring. Inside the bowl are the
distributing cone and the distributor with the disc
stack. The disc stack is kept compressed by the
hood. The sliding bowl bottom forms an internal
bottom in the bowl.
The bowl top is covered by the paring chamber
cover. The room between this cover and the bowl
hood is the paring chamber with the outlet paring
disc.
The sludge space is the space between the
sliding bowl bottom and the bowl hood in the bowl
periphery. It is kept closed by the sliding bowl
bottom which seals against a seal ring in the bowl
hood. At intervals set by the operator, the sliding
bowl bottom opens to empty the bowl of sludge.
The sludge discharge mechanism, which effects
the sliding bowl bottom, comprises operating slide
and operating water device. Passive parts are:
dosing ring, nozzles and valves.
The operating water device on the underside of
the bowl distributes water to the discharge
mechanism.

2.3.3 Cyclone
The cyclone is mounted on a short tube,
connected to the sludge duct in the frame top
part.
The cyclone reduces the strong kinetic energy of
the discharged sludge before the sludge is fed out
through outlet 222.

21
2.3 Separation process, main parts and function 2 Technical description

2.3.4 Separating function

Unseparated liquid is fed continuously from the
inlet and down through the pipe into the center of
the bowl. After having been accelerated in the
disc inlet the liquid is led by the distributing cone
towards the periphery of the bowl.
The liquid rises through slots in the distributor and
disc stack to be evenly distributed in the disc
stack.
In the disc stack the liquid is continuously
separated from sludge. The clean liquid flows
towards the centre, where it leaves the bowl and
enters the paring chamber. From there it is
pumped by the paring disc to the outlet.
Separated sludge collects in the sludge space to
be discharged.

22
2 Technical description 2.3 Separation process, main parts and function

2.3.5 Sludge discharge function

The sludge is discharged through a number of
ports (r) in the bowl wall. Between discharges
these ports are covered by the edge of sliding
bowl bottom (k), which is pressed upwards
against the seal ring in the bowl hood (e). The
sliding bowl bottom is kept in this position by the
force of a small quantity of water from the
operating water device (n) to the underside of the
sliding bowl bottom (k).
A discharge is effected by supplying further water
through the channel (v) in the distributing cover
under the bowl.

Bowl opening
The supplied operating water, which is led from
the operating device to the upper draining
chamber (t), gives a water pressure that presses

G0299211
the operating slide (l) with its valve plugs (s)
downwards. This allows the water under the
sliding bowl bottom (k) to run out through the e. Bowl hood
channels to the upper draining chamber (t). k. Sliding bowl bottom
The sliding bowl bottom is now pressed l. Operating slide
downwards by the force of the liquid in the bowl. It n. Operating water device
thereby opens the ports (r) and the sludge q. Sludge space
discharges. r. Sludge ports
s. Valve plugs
t. Upper draining chamber
u. Lower draining chamber
Bowl closing v. Operating water channels
The opening is immediately followed by the
closing.
The water in the upper draining chamber (t) runs
to the lower draining chamber (u). The pressure
on the operating slide decreases and the
operating slide is lifted by the pressure of the
piston in the operating water device. The valve
plugs (s) now prevent the water under the sliding
bowl bottom from escaping and the water
pressure under the sliding bowl bottom (k)
increases. The sliding bowl bottom is pressed
upwards against the seal ring in the bowl hood (e)
and the discharge is finished.

23
2.3 Separation process, main parts and function 2 Technical description

2.3.6 Flushing water function

The flushing water is used for cleaning of the
separator frame hood (inlet 302) and the cyclone
(inlet 304) internally without opening up the
separator.Cleaning can take place simultaneously
with the sludge discharge in the production
sequence as well as during the cleaning cycle.

2.3.7 Cooling system function

The frame hood lower and upper parts and the
bowl hood outside are cooled with freshwater
during operation. Inlet 405, outlet 406.

2.3.8 Liquid seal in paring

G0245711
chamber
Liquid is supplied to the paring chamber in order
to prevent air to mix with the process liquid in the
bowl. Inlet 441.

G0245811

Process connections
201. Inlet for process liquid
220. Outlet for clarified liquid
222. Outlet for sludge
302. Flushing above the bowl
304. Flushing in sediment outlet
375. Inlet for discharge water
405. Inlet for cooling of frame parts
406. Outlet for cooling of frame parts
441. Inlet for liquid seal in paring chamber
462. Drain of frame top part, lower
463. Drain of frame top part, upper
830. Junction box

24
2 Technical description 2.4 Mechanical power transmission, main parts and function

2.4 Mechanical power

transmission, main
parts and function
The main parts of the power transmission
between motor and bowl are:
Friction coupling (F), worm gear (C,D) and bowl
spindle (A).
The friction coupling (F) ensures a gentle start
and acceleration and prevents overloading of
worm gear and motor.
The worm gear ratio is about 5 to 1 (50 Hz) or
about 4 to 1 (60 Hz).
To decrease bearing wear and reduce
transmission of bowl vibrations to frame and
foundation the top bearing (B) of the bowl spindle
is mounted in a spring casing.
The worm wheel runs in a lubricating oil bath. The
bearings on the spindle and the worm wheel shaft
are lubricated by the oil mist produced by the
running worm wheel.

G0246411
A. Bowl spindle
B. Top bearing and spring casing
C,D. Worm gear
E. Worm wheel shaft
F. Friction coupling

Brake
The separator is equipped with a brake to be
used when stopping the separator. The use of the
brake reduces the retardation time of the bowl
and the critical speed will thus be passed quickly.
The brake lining acts on the outer ring of the
coupling drum.
G0246311

25
2.5 Sensors and indicators 2 Technical description

2.5 Sensors and

indicators

G0262211
• The revolution counter
(1) is driven from the worm wheel shaft to
ensure operation of the separator at correct
speed both in order to achieve the best
separating results and for reasons of safety.
The number of revolutions is counted per
minute. Refer to name plate for speed
particulars.
• The sight glass
(2) shows the oil level in the bottom part.
• Safety lock switch
The lock switch (3) should be connected to
the starter equipment so that starting of the
motor is prevent when the separator hood is
not (completely) closed.
• Junction box
The sensor is connected to a common
junction box from where the signals could be
taken to secondary devices.

26
2 Technical description 2.5 Sensors and indicators

• Speed sensor
The separator is equipped with a proximity
sensor (4) mounted near the brake pulley.
The pulley is equipped with four grooves
giving four impulses per revolution.
The sensor is of inductive type according to
the DIN 19234 (NAMUR) standard. When
supplied with a rated voltage it gives a current
signal with a size depending of the position of
the sensor head above the metal surface or
above the grove (non-metal).
The sensor is connected to a common
junction box from where the signals could be
taken to secondary devices.
• Vibration sensor
The separator is equipped with a vibration
sensor (vibration velocity sensor) mounted on
the frame. The sensor converts the
mechanical vibrations to an electric signal.
The signal has to be converted in a special
converter, in which the signal is compared
with preset values.
When the preset values are exceeded
appropriate countermeasures has to be
performed. The two levels are warning for
acceptable vibrations and safety stop when
extreme unbalance should occur.
Two levels of vibration are considered:
− acceptable unbalance, this is an vibration
level which causes no risk for the
environment, but which may reduce the
life time of bearings and other
components and therefore should be
detected and a warning be given in order
to be observed.
− extreme vibration, this is a state caused
by e.g unbalance of the bowl due to
sludge deposits on one side in the bowl.
In this case safety countermeasures have
to be performed as preventing of further
sludge discharges before stopping.
The sensor is connected to a common
junction box from where the signals could be
taken to secondary devices.

27
2.5 Sensors and indicators 2 Technical description

28
3 Operating Instructions

Contents

3.1 Before start 30

3.2 Start and run-up 31

3.3 Separation 32

3.4 Cleaning 32

3.5 Stop 33

3.6 Emergency stop 34

29
3.1 Before start 3 Operating Instructions

3.1 Before start

NOTE
If the separator is delivered as part of a
complete system, follow the operating
instructions for the system.

• Check that the bolts of the outlet cover and

the screws of the frame hood are fully
tightened.
• Check that the inlet pipe is tightened.

WARNING

Make sure that all couplings

and connections are securely
tightened to prevent leakage.
Escaping steam and hot liquids
can cause serious burns.

• If the separator has been dismantled -

check the assembly and the connections to
make sure that they are correct.
• Check that the oil level is in the middle of the
sightglass.

G0262011

• Open the valve to the operating water tank.

Look into the tank and check that it is filled to
the right level.
• Check that the brake is released.
G0262611

30
3 Operating Instructions 3.2 Start and run-up

3.2 Start and run-up

• Start the separator.
• Check the pressure guide (200 kPa) of
operating water.
• Check frame cooling water, inlet 405, outlet
406.
• Check the direction of rotation of the bowl.
The revolution counter should run clockwise.

WARNING

G0246211
Disintegration hazards

When power cables have been connected,

always check direction of rotation. If
incorrect, vital rotating parts could unscrew
causing disintegration of the machine.

• Check the separator for vibrations. When the

separator passes its critical speeds of
revolution a higher vibration is normal.
• Abnormal vibration of the separator during
run-up may be due to wrong assembly or bad
cleaning of the bowl. If so, stop the separator
immediately and inspect the bowl.
• Check the ammeter on the motor starter to
ensure that the separator has reached full
speed.
During start, the ammeter reaches a peak
and then slowly drops. When the friction
coupling engages, the ammeter goes slowly
up again and then slowly drops to a low and
stable position, which is the normal running
position.
• At idling speed, the valve for operating water
opens for approximately 10 seconds, to close
the bowl.
S0009611

31
3.3 Separation 3 Operating Instructions

3.3 Separation
• Check that the separator has correct inlet and
outlet pressures. See ‘‘8 Technical
References” on page 149.
• Check the throughput.
• Discharge by opening the valve for the
operating water. Opening time: See ‘‘8.2
Technical data” on page 151.
• The discharge interval must be adjusted
according to the solids content in the feed.
See ‘‘8.2 Technical data” on page 151.

WARNING

Disintegration hazards

Ensure that correct discharge intervals and

cleaning procedures are used.
Unbalance due to improper washing out of
solids may lead to contact between rotating
and non-rotating parts.

3.4 Cleaning
Cleaning of the separator after separation is
imperative.
Discharge repeatedly until solids no longer
remain in the bowl.

32
3 Operating Instructions 3.5 Stop

3.5 Stop
Clean the separator before stopping. Otherwise
manual cleaning has to be done before next start
up.
• Stop the separator.
• Pull the brake.

WARNING

Entrapment hazard

Make sure that rotating parts have come to a

complete standstill before starting any
dismantling work.
The revolution counter indicates if separator
parts are rotating or not.

33
3.6 Emergency stop 3 Operating Instructions

3.6 Emergency stop

If the separator begins to vibrate excessively
during operation, stop it immediately by pushing
the emergency stop.
The following will happen automatically:
• The bowl is kept full until standstill.
• The bowl is kept close.
• The separator motor is switched off.

S0009911
Evacuate the room. The separator may be
hazardous when passing resonance frequencies
during the spin down.

WARNING

Never discharge a vibrating

separator.

Never acknowledge the alarm until the separator

has stopped and the danger has passed.
After an emergency stop the cause of the fault
must be found.
If no cause can be found, a major service must be
carried out and all moving parts checked
carefully.
For further information about service see ‘‘5
Maintenance general” on page 43.
Reset the emergency push button by turning it in
the direction of the arrow.

34
4 Trouble tracing

Contents

4.1 VNPX separating function 36

4.2 Separator mechanical functions 39

35
4.1 VNPX separating function 4 Trouble tracing

4.1 VNPX separating

function
Cause Remedy

A Liquid flows out through bowl casing drain and/or cyclone outlet

See also B, below

• Hermetic seal water. Normal.

• Bowl flushing. Normal.

• Sludge duct flushing. Normal.

• Sludge discharge in progress. None (normal).

• O-ring at paring chamber cover defective. Replace.

• Bowl hood seal ring defective or sealing Replace seal ring. Smoothen surface on sliding
surface of sliding bowl bottom damaged. bowl bottom or replace the erosion liner.

• Seal rings in paring disc device defective. Replace.

• Bowl speed too low. Make sure current is on and brake is off, examine
motor and power transmission.

• Overflow over paring chamber cover. Reduce outlet pressure or reduce flow rate.

• Valve(s) in outlet line closed. Check.

• Bowl is not closed. Stop liquid flow and close the bowl.

B Bowl opens unintentionally during operation

See also A, above.

• Square ring in sliding bowl bottom defective. Replace.

• Nozzles in bowl body clogged. Clean.

• Leakage in operation device. Check and replace O-rings.

• Valve plugs defective. Replace.

36
4 Trouble tracing 4.1 VNPX separating function

Cause Remedy

C Bowl fails to close before operation

• Hydraulic piston does not move. Check.

• Operating slide does not move. Check.

• Nozzles in bowl body clogged or worn. Clean or replace.

• Water pressure too low. Check the pressure: 200 kPa.

• Valve opening time too short. Check.

• Valve strainer clogged. Check.

• Seal ring in operating slide defective. Replace.

• Valve plugs defective. Replace.

• Leakage in operating device. Check and replace O-rings.

37
4.1 VNPX separating function 4 Trouble tracing

Cause Remedy

D Bowl fails to open for sludge discharge

• Hydraulic piston does not move. Check.

• Operating slide does not move. Check.

• Strainer in valve for operating water clogged. Clean the strainer.

• Water pressure too low. Check the pressure: 200 kPa.

• Valve opening time too short. Check opening time.

• Hose between solenoid valve and separator Remedy.

kinked.

• Seal ring in operating slide defective. Replace.

E Unsatisfactory sludge discharge

• Nozzles in bowl body clogged or worn. Clean or replace.

• Valve opening time too short. Check opening time.

• Water pressure too low. Check the pressure: 200 kPa.

• Sludge deposits in operating system. Clean.

F Unsatisfactory separation result

• Throughput too high. Adjust.

• Sludge space in bowl filled. Discharge and shorten time between discharges.

• Bowl disc stack clogged. Clean.

• Inlet clogged. Clean.

• Bowl speed too low. Make sue the brake is off, examine motor and
power transmission.

38
4 Trouble tracing 4.2 Separator mechanical functions

4.2 Separator mechanical

functions
Cause Remedy

A Separator vibrates during starting sequence

Note! Some vibrations are normal during starting sequence, when the separator passes its
critical speeds.

• Bowl out of balance due to: Stop immediately by pressing emergency stop
− bad cleaning push-button or switching off power. Apply the
− incorrect assembling brake. Establish cause.
− too few discs Incorrectly tightened lock ring involves fatal
− bad tightening of lock ring danger.
− bowl assembled with parts from different
separators

• Uneven sludge deposits in sludge space. See Separating function above.

• Height position of paring disc or bowl spindle is Stop, check and adjust.
wrong.

• Bowl spindle bent (max 0,04mm). Replace.

B Separator vibrates, running sequence

• Uneven sludge deposits in sludge space. See Separating function above.

• Bearing damaged or worn. Replace.

• Vibration - damping rubber washer worn out. Renew frame feet washers every four years.

• Spindle top bearing spring broken. Replace all springs.

C Smell

• Normal occurrence during start as friction None.

blocks are sliding.

• Brake applied. Release.

• Too low oil level in gear housing. Check quantity and add oil if necessary.

39
4.2 Separator mechanical functions 4 Trouble tracing

Cause Remedy

D Noise

• Too low oil level in gear housing. Check quantity and add oil if necessary.

• Height position of paring disc or operating Stop, check and adjust.

device is wrong.

• Worm wheel and worm are worn Replace.

• Bearings damaged or worn. Replace.

• Friction pads worn. Replace.

E Speed too high

• Wrong gear transmission (50Hz gears for 60 Stop immediately and rectify faults.
Hz current). In case of overspeed check bowl for possible
deformation.
Contact your Alfa Laval representative.

• Frequency of power supply. (50Hz/60Hz). Check.

F Speed too low

• Brake applied. Release.

• Friction pads worn or oily. Replace or clean.

• Bowl not closed or leaking. Dismantle and check.

• Motor failure. Repair.

• Bearing damaged or worn. Replace.

• Bearing overheated. Replace.

• Wrong gear transmission (60 Hz gears for Stop and remedy. See paragraph E.
50 Hz current).

G Starting power too low

• Wrong transmission. See paragraph E.

40
4 Trouble tracing 4.2 Separator mechanical functions

Cause Remedy

H Starting time too long

• Brake applied. Release.

• Friction pads worn or oily. Replace or clean.

• Height position of paring disc or operating Stop, check and adjust.

device wrong.

• Worm wheel and worm are worn. Replace.

• Motor failure. Repair.

• Bearing damaged or worn. Replace.

I Starting power too high

• Wrong gear transmission (50 Hz gears for 60 Stop immediately. See paragraph E.
Hz current).

• Liquid flow through bowl. Stop flow.

• Opposite direction of rotation. Tell electrician to switch electrical phase.

J Retardation time too long

• Brake lining worn or oily. Replace or clean.

K Water in worm gear housing

• Bowl casing drain obstructed. Clean. Change oil.

• Leakage at stop bearing. Replace seal ring and change oil.

• Condensation. Change oil.

41
4.2 Separator mechanical functions 4 Trouble tracing

42
5 Maintenance general

Contents

5.1 Periodic maintenance 44

5.1.1 Maintenance activities 44
5.1.2 Spare parts kits 45

5.2 Maintenance schedule 46

5.2.1 Lubrication chart, general 48
5.2.2 Recommended lubricating oils 50
5.2.3 Lubricants 51
5.2.4 Recommended oil brands 55

5.3 Oil change in worm gear housing 56

5.4 Miscellaneous maintenance 58

5.4.1 Vibration analysis 58
5.4.2 Oiling 58
5.4.3 Shut-downs 58

43
5.1 Periodic maintenance 5 Maintenance general

5.1 Periodic maintenance

Periodic maintenance reduces the risk of
unexpected stoppages and breakdowns. A
maintenance schedule is shown on the following
pages in order to facilitate preventive
maintenance.

WARNING

Disintegration hazards

Worn, eroded or improperly assembled

machine parts may cause severe damage.
Follow maintenance instructions and check
for possible damage.

5.1.1 Maintenance activities

The following directions for preventive
maintenance specify what is to be cleaned,
checked and replaced with new items in
accordance with the maintenance schedule.
IS; Intermediate service
Cleaning, checking, replacement of sealing
parts in bowl, inlet/outlet and separator top
part.
Interval: 2000 operating hours, or 3 months
MS;Major service
Cleaning, checking, replacement of O-rings,
ball bearings and buffers for bowl spindle, O-
rings for separator top part. Interval: 8000
operating hours or 1 year
Cleaning, checking and/or replacement of bottom
bearing holder for bowl spindle, ball bearings and
frame feet are to be done within a 4-year service
interval. Spares for this service, and additional
service which requires spares not included in the
spare parts kits, have to be ordered separately as
required.

44
5 Maintenance general 5.1 Periodic maintenance

5.1.2 Spare parts kits

Special kits of spares are available for the
periodic maintenance. These kits are designated
in accordance with the separator maintenance

S0021031
schedule as follows:
• IS; Intermediate service kit Spare parts kits
• MS; Major service kit
The contents of the spare parts kits are described
in the Spare Parts Catalogue (SPC).

45
5.2 Maintenance schedule 5 Maintenance general

5.2 Maintenance
schedule
Maximum intervals
Part Action More
Monthly IS MS Every 4 infor-
years mation

Note: Corrosion and erosion must be checked every time the separator and/or ancillary parts
are dismantled.

Inlet, outlet, bowl

Inlet/outlet Cleaning and inspection X

Frame hood Cleaning and inspection X

Threads of lock ring and bowl Cleaning and inspection X

body

Threads of inlet pipe and Cleaning and inspection X

paring disc

Bowl discs Cleaning and inspection X

Disc stack pressure Checking X

Sliding bowl bottom Cleaning and inspection X

Body body nave Cleaning and inspection X

Body body nozzles Cleaning and inspection X

Discharges mechanism Cleaning and inspection X

Valve plugs Checking X

Erosion liner on sliding bowl Checking X

bottom

Erosion liners on sediment Checking X

ports

Inlet discs Checking X

Height position of paring disc Checking X

IS: Intermediate Service. Interval see ‘‘5.1.1

Maintenance activities” on page 44
MS:Major service. Interval see ‘‘5.1.1
Maintenance activities” on page 44

46
5 Maintenance general 5.2 Maintenance schedule

Maximum intervals
Part Action More
Monthly IS MS Every infor-
4 years mation

Bowl spindle

Bowl spindle Cleaning and inspection X

Bearing Exchange X

Ball bearing housings Inspection X

Bowl spindle top Inspection X

Bowl spindle radial wobble Inspection X

Bowl spindle height position Checking and X

adjustment

Oil mist fan Checking top X

Friction coupling

Friction pads Cleaning inspection X

Brake

Brake lining Cleaning inspection X

Brake spring and shoe Checking X

Frame feet

Frame feet Exchange X

Oil sump

Oil sump Oil change X

Oil filling device Cleaning and inspection X

Electric motor

Electric motor See manufacturer’s

instructions

IS: Intermediate Service. Interval see ‘‘5.1.1

Maintenance activities” on page 44
MS:Major service. Interval see ‘‘5.1.1
Maintenance activities” on page 44

47
5.2 Maintenance schedule 5 Maintenance general

5.2.1 Lubrication chart, general

Alfa Laval ref. 553216-01, rev. 6

Lubrication chart, general

Lubricating points Type of lubricant

Bowl spindle ball bearings and buffers are Lubricating oil as specified in “‘‘5.2.2
lubricated by oil mist Recommended lubricating oils” on page 50

Bowl spindle taper Lube oil, only a few drops for rust protection

Metal buffers of bowl spindle Lube oil

Bowl: Pastes as specified in ‘‘5.2.3 Lubricants” on page

Sliding contact surfaces and pressure loaded 51
surfaces such as lock rings, threads of lock
rings, bowl hood and cap nut

Rubber seal rings Grease as specified in ‘‘5.2.3 Lubricants” on page

51

Friction coupling ball bearings The bearings are packed with grease and sealed
and need no extra lubrication

Electric motor Follow manufacturer's instructions

48
5 Maintenance general 5.2 Maintenance schedule

Alfa Laval Lubricating Oil Groups

• Group A oil: a high quality gear oil on paraffin base with stable AW (anti wear) additives.
• Group B oil: a high quality gear oil on paraffin base with stable EP (extreme pressure)
additives.
• Group D oil: a synthetic base oil with additives stable at high operating temperatures.
• Group E oil: Characteristics as a group D-oil but suitable at a higher operation power (≤55 kW)
• Do not mix different oil brands or oils from different oil groups.
Always use clean vessels when handling lubricating oil.
Great attention must be paid not to contaminate the lubricating oil. Of particular importance is
to avoid mixing of different types of oil. Even a few drops of motor oil mixed into a synthetic oil
may result in severe foaming.
Any presence of black deposits in a mineral type oil is an indication that the oil base has
deteriorated seriously or that some of the oil additives have precipitated. Always investigate
why black deposits occurs.
• If it is necessary to change from one group of oil brand to another it is recommended to do this
in connection with an overhaul of the separator. Clean the gear housing and the spindle parts
thoroughly and remove all deposits before filling the new oil.

NOTE
Always clean and dry parts (also tools) before
lubricants are applied.

CAUTION

Check the oil level before start.

Top up when necessary.
Oil volume = see “Technical Data”.

• It is of utmost importance to use the lubricants recommended in our documentation.

This does not exclude, however, the use of other brands, provided they have equivalently high
quality properties as the brands recommended. The use of oilbrands and other lubricants than
recommended, is done on the exclusive responsibility of the user or oil supplier.
Applying, handling and storing of lubricants
Always be sure to follow lubricants manufacturer's instructions.

49
5.2 Maintenance schedule 5 Maintenance general

5.2.2 Recommended lubricating

oils
Alfa Laval ref. 553219-07, rev. 2

Type of frame: X 10 with motor <25 kW

One group of lubricating oils is approved.
It is designated as lubricating oil group B.
The numerical value after the letter states the
viscosity grade.

Ambient temperature °C Alfa Laval Time in operation Oil

lubricating oil group change interval

between +5 and 45 B/220 1500 h

Note!
• In a new installation or after change of gear
transmission, change oil after 200 operating
hours.
• When the separator is running for short
periods, lubricating oil must be changed
every 12 months even if the total number of
operating hours is less than stated in the
recommendations above.
• Check and prelubricate spindle bearings on
separators which have been out of service for
6 months or longer.
• In seasonal operation: change oil before
every operating period.

50
5 Maintenance general 5.2 Maintenance schedule

5.2.3 Lubricants
Alfa Laval ref. 553217-01, rev. 9

NOTE
The data in below tables is based on supplier information in regards to lubrication properties.
Trade names and designations might vary from country to country, contact your local supplier for
more information.
Brands with Alfa Laval article number are approved and recommended for use.

Pastes for non-food applications:

Manufacturer Designation Alfa Laval No

Fuchs Lubritech Gleitmo 805K

Gleitmo 705

Dow Corning Molykote 1000 (Paste) 537086-02 (1000 g)

Molykote 1000 (Paste) 537086-03 (100 g)
Molykote G-rapid plus (Paste) 537086-04 (50 g)

Rocol Dry Moly Paste

MT-LM

Klüber Wolfracoat C (Paste)

Bonded coatings:

Manufacturer Designation Alfa Laval No

Fuchs Lubritech Gleitmo 900 (Varnish or spray)

Dow Corning Molykote D321R (Spray) 535586-01 (400 ml)

Molykote D321R (Varnish)

51
5.2 Maintenance schedule 5 Maintenance general

Pastes for hygienic applications

(NSF registered H1 is prefered):

Manufacturer Designation Hygienic Comment Alfa Laval No

Fuchs Lubritech Gleitmo 805 DVGW (KTW) approval

for drinking water
(TZW prüfzeugnis)

Geralyn 2 NSF Registered H1 561764-01 (50 g)

(3 sep 2004)

Bremer & Rivolta F.L.A NSF Registered H1

Leguil, Fuchs (15 Feb 2003)
Lubritech German §5 Absatz 1
LMBG approved

Dow Corning Molykote TP 42

Molykote D

Molykote P1900 NSF Registered H1

(7 Jan 2004)

Klüber Klüberpaste 46 MR 401 White; contains no

lead, cadmium, nickel,
sulphur nor halogens.

Klüberpaste UH1 96-402 NSF Registered H1

(25 Feb 2004)

Rocol Foodlube Multi Paste NSF Registered H1

(13 Apr 2001)

52
5 Maintenance general 5.2 Maintenance schedule

Silicone grease for rubber rings:

Manufacturer Designation Follows according. to Alfa Laval No
Manufacturer
Dow Corning Molykote 111 Conform to the FDA 539474-02 (100 g)
(Compound) regulations (21 CFR
Molykote 111 178.3570) for occasional 539474-03 (25 g)
(Compound) food contact. Certified:
National Water Council UK
and WRC, UK. Certified:
food industry as per
Chemical Testing Laboratory
Dr. Böhm, Munich.
Molykote Foodslip Former USDA H1 approved. 569415-01 (50 g)
SR grease
Fuchs Chemplex 750 DVGW approved according
Lubritech to the German KTW-
recomendations for drinking
water.
Bremer & Leguil NSF Registered H1
Rivolta F.L.G MD2 (15 Feb 2003)
Klüber Unisilkon L 250 L Complies with German
Environmental Agency on
hygiene requirements for tap
water. Certified by DVGW-
KTW, WRC, AS4020, ACS.
Paraliq GTE 703 NSF Registered H1 (25 Feb
2004) Complies with LMBG
and the European standard
EN 1672, part2.
Bel-Ray No-Tox Silicone NSF Registered H1
valve seal (19 June 2002)
MMCC ALCO 220 NSF Registered H1
(25 March 2002)
Rocol Foodlube Hi-Temp NSF Registered H1
(18 April 2001)

53
5.2 Maintenance schedule 5 Maintenance general

Greases for ball and roller bearings:

NOTE
Always follow the specific recommendation for lubrication as advised by the
manufacturer.

Manufacturer Designation Alfa Laval No

BP Energrease MP-MG2
Energrease LS2
Energrease LS-EP2

Castrol APS 2
Spheerol EPL 2

Chevron Texaco Chevron Dura-Lith Grease EP2

Texaco Multifak AFB 2

Dow Corning Molykote G-0101

Molykote Multilub

ExxonMobil Beacon EP2

Unirex N2
Mobilith SHC 460
Mobilux EP2

Fuchs Lubritech Lagermeister EP2

Q8/Kuwait Rembrandt EP2

Petroleum

Shell Alvania EP 2
Albida EP2

SKF LGEP 2
LGMT 2

Total Multis EP2

54
5 Maintenance general 5.2 Maintenance schedule

5.2.4 Recommended oil brands

Alfa Laval ref. 553218-02, rev. 3

Alfa Laval lubrication oil group B

Viscosity grade VG (ISO 3448/3104) 220

Viscosity index VI (ISO 2909) >92

Manufacturer Designation

Bel-Ray 06-220

BP Energol GR-XP 220

Castrol Alpha SP 220

Chevron Ultra Gear 220

Gear Compound EP 220

ELF Epona Z 220

Esso/Exxon Spartan EP 220

Fina Giran 220

Mobil Mobilgear 630

(Mobilgear SHC 220) * Synthetic

Optimol Optigear BM 220

Q8/Kuwait Petroleum Goya 220

Shell Omala 220

(Delima HT 320) * Synthetic

Texaco/Caltex Meropa 220

* These oils must be used when the frame

temperature is above 80 °C.
If you can’t verify the temperature by
measuring, a rough estimate is that 80 °C
is when you can touch the surface of lower part of
frame for a short time only.

55
5.3 Oil change in worm gear housing 5 Maintenance general

5.3 Oil change in worm

gear housing

1. Oil filling hole and plug

2. Sight glass
3. Oil drain hole and screw

G0134411
• Place a collecting tray under the drain hole,
remove the screw and drain off the oil.

CAUTION

Burn hazards

Lubricating oil and various machine surfaces

can be hot and cause burns.

G0262111

56
5 Maintenance general 5.3 Oil change in worm gear housing

• Fill new oil into the worm gear housing. Oil

level slightly above middle of sight glass. For
correct oil quality and quantity, see ‘‘5.2.1
Lubrication chart, general” on page 48.

NOTE

G0262011
The separator is delivered without oil in the
worm gear housing. Therefore, it is
necessary to supply oil to the worm gear
housing before the first start of the separator.

CAUTION

Skin irritation hazard

Personnel handling the oil must be instructed

in its use (e.g. the possible risk of skin
irritation, dermatitis). Ask for and follow the
instructions from the oil supplier.
Spray should only be used in well ventilated
localities.

57
5.4 Miscellaneous maintenance 5 Maintenance general

5.4 Miscellaneous
maintenance

5.4.1 Vibration analysis

Excessive vibration or noise indicates that
something is incorrect. Stop the separator and
look for the cause.

S0050811
Use the vibration analysis equipment to
periodically check and record the magnitude of
vibration.

5.4.2 Oiling
Protect cleaned carbon steel parts against
corrosion by oiling. Separator parts that are not
assembled after cleaning must be wiped and
protected against dust and dirt.

5.4.3 Shut-downs
If the separator is shut down for some time, the
parts in contact with process liquid must be oiled.
The O-rings should be removed.

NOTE
The bowl must not be left on the spindle.
Vibrations in the foundation can be
transmitted to the bowl and produce one-
sided loading of the bearings. The resultant
indentations in the ball bearing races can
cause bearing failure.

58
6 Dismantling/Assembly

Contents

6.1 General information 60 6.5 Exchange of brake lining 112

6.2 Exploded views 61 6.6 Exchange of coupling pads 114

6.2.1 Inlet, bowl hood, disc stack 61
6.2.2 Bowl body and discharge mechanism62 6.7 Lifting and transport instruction 115
6.2.3 Operating water device 63
6.2.4 Bowl spindle 64 6.8 Exchange of frame feet 116
6.2.5 Horizontal driving device 66

6.9 Vibration sensor 117

6.3 Dismantling 67
6.9.1 Replacing vibration sensor 117
6.3.1 Dismantling of inlet/outlet, bowl hood,
disc stack 67
6.10 Speed sensor 118
6.3.2 Dismantling of bowl body 72
6.10.1 Replacing the speed sensor 118
6.3.3 Dismantling of the operating water
device 75 6.10.2 Adjustment of speed sensor
distance 119
6.3.4 Dismantling of disc stack and
disc inlet 77
6.3.5 Dismantling of bowl spindle 78
6.3.6 Dismantling of horizontal driving
device 84

6.4 Assembly 87
6.4.1 Assembly of horizontal driving device,
friction coupling 87
6.4.2 Assembly of bowl spindle 91
6.4.3 Assembly of disc stack and
disc inlet 100
6.4.4 Assembly of operating water device 101
6.4.5 Assembly of wear liners in the bowl 101
6.4.6 Assembly of discharge mechanism
and bowl body 102
6.4.7 Assembly of disc stack, bowl hood,
inlet/outlet 105

59
6.1 General information 6 Dismantling/Assembly

6.1 General information

The separator has to be dismantled regularly for
cleaning and inspection.
The recommended intervals are stated in ‘‘5
Maintenance general” on page 43.

WARNING

Entrapment hazard

Make sure that rotating parts have come to a

complete standstill before starting any
dismantling work.
The revolution counter indicates if separator
parts are rotating or not.

The frame hood and the heavy bowl parts must

be lifted by means of a hoist. Position the hoist
exactly straight above the bowl centre. Use an
endless sling and a lifting hook with catch.
The parts must be handled carefully.
Don’t place parts directly on the floor, but on a
clean rubber mat, fibreboard or a suitable pallet.

60
6 Dismantling/Assembly 6.2 Exploded views

6.2 Exploded views

6.2.1 Inlet, bowl hood, disc stack

A. Elbow pipe
B Rectangular ring
C. Inlet pipe
D O-ring
E. Discharge cover
F. Height adjusting ring
G. Frame hood
H. Small lock ring
I. Paring chamber cover
J. Seal disc
K. Wing insert
L. O-ring
M. Paring disc
N. O-ring
O. Large lock ring
P. Bowl hood
Q. O-ring
R. Seal ring
S. Top disc
T. Distributor and disc stack

G0479631

61
6.2 Exploded views 6 Dismantling/Assembly

6.2.2 Bowl body and discharge

mechanism
A. O-ring
B. Center screw
C. Distributing cone
D. Clamp ring
E. O-ring
F. O-ring
G. Erosion liner
H. Sliding bowl bottom
I. Rectangular ring
J. Bowl body
K. Operating slide
L. O-ring
M. O-ring
N. Dosing ring
O. Valve plug
P. Wear protection
Q. O-ring

G0477511

62
6 Dismantling/Assembly 6.2 Exploded views

6.2.3 Operating water device

A. Upper part of distributing ring
B. O-ring
C. O-ring
D. Piston
E. Rectangular ring
F. O-ring
G. O-ring
H Center part of distributing ring
I O-ring
J. Bottom part of distributing ring
K. O-ring
L Screw

G0190411

63
6.2 Exploded views 6 Dismantling/Assembly

6.2.4 Bowl spindle

G0259581

A. Bottom bearing housing

B. O-ring
C. Screw
D. Bowl spindle

64
6 Dismantling/Assembly 6.2 Exploded views

E. Single row ball bearing

F. Ball bearing holder, lower
G. Rubber buffer, lower
H. Compression spring
I. Top bearing support
J. Oil fan
K. Ball bearing holder, upper
L Rubber buffer, upper
M. Top bearing cover
N. O-ring
O. Screw
P. Worm
Q Support washer
R. Double row roller bearing
S. Spacing washer
T. Lock washer
U. Round nut
V. Gasket
W. Screw
X. Protecting collar
Z Rubber ring
AA. Screw
BB. O-ring
CC. Protecting plate
DD. Screw
EE. O-ring

65
6.2 Exploded views 6 Dismantling/Assembly

6.2.5 Horizontal driving device

G02465R1
A. Motor Q. Plain washer
B. Stud bolt R. Brake pulley
B1. Nut S. Round nut
C. Washer T. Frame bottom part
D. Screw U. Bearing housing
E. Flat key for coupling V. Round nut
F. Motor adapter W. Large ball bearing
G. Nut X. Lock ring
H. Spring washer Y. Worm wheel shaft
I. Screw Z. Worm wheel
J. Coupling disc AA. Clamp element
K. Flat key BB. Small ball bearing
L. Hinge bolt CC. O-ring
M. Friction block DD. Corrugated shim
N. Split pin EE. Gasket
O. Screw FF. Bearing shield
P. Spring washer GG Screw

66
6 Dismantling/Assembly 6.3 Dismantling

6.3 Dismantling

6.3.1 Dismantling of inlet/outlet,

bowl hood, disc stack
1. Unscrew and remove the elbow pipe. Use the
hook key.

G0182911
2. Unscrew the inlet pipe with the other end of
the hook key. Lift it out carefully.

G0183011
3. Remove the discharge cover which is
attached to the frame hood by four screws.
Some slight prizing may be necessary.

G0183111

67
6.3 Dismantling 6 Dismantling/Assembly

4. Unscrew and remove the frame hood

fastening bolts.

G0183211
5. Fit two eye bolts opposite each other on the
frame-hood top. Lift off the frame hood by
means of hoist and slings.

G0183311
6. Apply the special tool so that the screws of
the tool fit into the holes in the small lock ring.
Tighten the screws.
Unscrew and remove the small lock ring.
Note! Left-hand thread!
G0284711

68
6 Dismantling/Assembly 6.3 Dismantling

7. Remove the paring chamber cover.

G0183511
8. Remove the seal disc.

G0183611
9. Remove the wing insert.

G0183711

69
6.3 Dismantling 6 Dismantling/Assembly

10. Carefully lift out the paring disc and the inlet
pipe.

G0183811
11. Screw the lifting tool for the bowl hood onto
the bowl hood top.

G0183921
12. Put the compressing tool on the lifting tool.
Use the lever arm to screw the pole of the tool
into the threads of the distributor.
Note! The switch position.

G0184041

13. Turn the switch to position for compression.

Compress the disc stack by pumping with the
lever arm. The compressing tool is hydraulic
and has a relief valve.
G0184141

70
6 Dismantling/Assembly 6.3 Dismantling

14. Fit the large lock ring tool.

Apply the brake to prevent the separator bowl
from rotating.
Loosen the large lock ring by hitting the tool
handle with the tin mallet. Unscrew the large
lock ring.
Note! Left-hand thread!
Fit eye bolts and remove the ring by hoist.

NOTE
The large lock ring must be kept lying

G0259121
horizontally or it may deform. Even the
slightest deformation could make it
impossible to mount again.

15. Lift off the bowl hood by hoist. If it sticks -

loosen the bowl hood in the following way:
Release the compressing tool and the lifting
tool and rearrange them:
Put the compressing tool on the top of the
distributor before the lifting tool is screwed
onto the bowl hood top.
Pump with the lever arm till the bowl hood lifts
from the bowl body. Remove the compressing
tool. Fit a lifting sling to the handles of the tool
and lift off the bowl hood by hoist.

G0184321
WARNING

Crush hazards

Use correct lifting tools and follow lifting

instructions.
Do not work under hanging load.

71
6.3 Dismantling 6 Dismantling/Assembly

16. Fit an eye bolt to the distributor and lift the

distributor with the disc stack by hoist.
Dismantling, cleaning and inspection of disc
stack and disc inlet.

CAUTION

Cut hazard

Sharp edges on separator discs may cause

cuts.

G0184411
6.3.2 Dismantling of bowl body
1. Unscrew and remove the cap nut.
Note! Left-hand thread!

G0184511
2. Fit the lifting tool to the distributing cone.

G0184611

3. Lift it out.
G0184711

72
6 Dismantling/Assembly 6.3 Dismantling

4. Tighten the special lifting tool to the sliding

bowl bottom and lift it off by hoist.
Remove the O-ring from the bowl body nave.

G0184911
5. Dismantle the sliding bowl by hitting the tool
pins with the tin mallet.
Note! Left-hand thread!

G0477411
6. Remove the bowl body in the following way to
get access to the operating water
mechanism.
Remove three screws in the bottom of the
bowl body.
Fit the bowl body lifting tool in the bowl body
bottom with the three screws.
Release the bowl body from the spindle by
using the eye bolt as a puller: Turn the eye
G0185011

bolt by using a bar till a “click” is heard.

73
6.3 Dismantling 6 Dismantling/Assembly

7. Lift off the bowl body with a hoist.

G0185111
8. Turn the bowl body upside down by fitting a
strap through a sludge port and using the
hoist.

WARNING

Crush hazard

Risk for jamming injury when turning the

G0135111
bowl body.

9. Unscrew the three screws which fasten the

operating water device. Remove the device
and take care of the O-ring.
See ‘‘6.3.3 Dismantling of the operating water
device” on page 75.
G0185311

74
6 Dismantling/Assembly 6.3 Dismantling

10. The dosing ring is threaded and tightened to

the bowl body. The direction for dismantling is
indicated by an arrow on the dosing ring.
Fit the special tool on the dosing ring. Give
the tool some light blows with the tin mallet to
release the dosing ring. Unscrew it.
Fit an eye bolt opposite the tool and lift off the
dosing ring by hoist.

G0185411
11. Lift off the operating slide by hoist.
Exchange of valve plugs at regular intervals,
see ‘‘7.5.4 Valve plugs” on page 133.

G0185511
6.3.3 Dismantling of the operating
water device
1. Carefully lift out the upper part of the
distributing ring by means of two thin screw
drivers.

G0185611

2. Carefully knock out the bottom part of the

distributing ring and remove it.
G0185711

75
6.3 Dismantling 6 Dismantling/Assembly

3. Put the distributing ring - the piston pointing

downwards - on a support. Knock out the
piston carefully.
4. Take care of all O-rings. Check that O-rings
and guiding and sealing surfaces are not
damaged, see ‘‘7.3 Guiding surfaces” on
page 129.
Exchange of O-rings at Intermediate Service.

G0185811

76
6 Dismantling/Assembly 6.3 Dismantling

6.3.4 Dismantling of disc stack

and disc inlet
1. Lift off the discs, a couple at a time.
2. Undo the three screws on the top of the
distributor. Lay the distributor down and take
out the disc inlet.
3. Flush the disc inlet with water. If needed,
unscrew the three nuts and dismantle the disc

G0185911
inlet.

G0186011

77
6.3 Dismantling 6 Dismantling/Assembly

6.3.5 Dismantling of bowl spindle

1. Drain off the oil from the gear housing.

CAUTION

Burn hazards

Lubricating oil and various machine surfaces

can be hot and cause burns.

G0493311
2. Remove the cover before starting
dismantling. Check the teeth of the worm
wheel and worm for wear. See ‘‘7 Check
points” on page 121.

G0127911
3. On the horizontal driving device, loosen the
screws in the clamping element uniformly and
in the order shown in the figure. In the first
round, do not loosen them more than 1/4 turn
to avoid wryness in the clamping rings. Do
not unscrew the screws entirely.

CAUTION

Crush hazards

The worm wheel is quite heavy. Hold it firmly

when dismantling. Risk for jamming injury.
G0207911

78
6 Dismantling/Assembly 6.3 Dismantling

4. Push the worm wheel with the clamping

element aside, for example by means of a
piece of wood.

G0187411
5. Unscrew the six screws and remove the
hood.

G0187511
6. Remove the three screws and remove the
protecting plate.

G0187611

7. Remove the O-ring and pull off the protecting

collar.
Note! No threads.
G0187711

79
6.3 Dismantling 6 Dismantling/Assembly

8. Unscrew the six screws and lift out the guard.

G0187811
9. Remove the rubber ring.

G0187911
10. Unscrew the six screws in the top bearing
cover.
Note! The screws are locked with Loctite.

G0188011

11. Lift out the spindle unit and place it

horizontally.
G0188111

80
6 Dismantling/Assembly 6.3 Dismantling

12. Make a wooden support to be used during

certain sub-operations.
Open the lock washer and loosen the nut.

G0188211
13. Remove the round nut, the lock washer and
the spacing washer.

G0188311
14. Pull off the worm together with its roller
bearing and the support washer.

G0188411
15. Unscrew and remove the oil fan.
Fit the lifting tool to the spindle bottom end.
Lift the spindle upside down into the mounting
tube to rest on the top bearing cover. G0188511

81
6.3 Dismantling 6 Dismantling/Assembly

16. Remove the three screws.

Remove the top bearing support and the
lower rubber buffer. The lower rubber buffer is
provided with springs.

G0188611
17. Lift out the spindle and lay it down again.
Remove the bearing cover and the upper
rubber buffer.

G0188711
18. Ease off the lower and upper ball bearing
holders by using the three screws removed in
16 (above).

G0188811
19. Drive off the ball bearing from the top end.
Use a wooden bed for the spindle top.

G0188911

82
6 Dismantling/Assembly 6.3 Dismantling

20. Remove the bottom bearing housing from the

frame.

G0259561
21. Clean the parts thoroughly.

83
6.3 Dismantling 6 Dismantling/Assembly

6.3.6 Dismantling of horizontal

driving device
Make sure the power is off.
The horizontal driving device is dismantled as
follows. It will be easiest to loosen the clamping of
the worm wheel if the bowl and spindle are still
fitted in the machine.
1. Drain off oil from the worm gear housing.

G0212411
CAUTION

Burn hazards

Lubricating oil and various machine surfaces

can be hot and cause burns.

2. Remove the worm wheel guard with the

revolution counter.
3. Remove the brake cover.
4. Remove the bearing shield: ease it off by
means of two of the fastening bolts.

CAUTION

Crush hazards

The shield is quite heavy (15 kg cast iron).

Hold the shield firmly or use two longer
screws as guide pins so as not to drop it
during dismantling.

5. Fit the puller tool and pull off the ball bearing.
G0212511

84
6 Dismantling/Assembly 6.3 Dismantling

6. Loosen the clamp screws uniformly and

successively around the clamping rings in the
order stated. In the first round, do not loosen
them more than 1/4 turn to avoid wryness in
the clamping rings. Do not screw out the
clamp screws entirely.
7. Remove the clamping element and the worm
wheel.

CAUTION

Crush hazards

Risk of injury. Be careful not to get fingers

trapped when removing the worm wheel.

G0212811
8. Remove the motor, as illustrated.

G0191811

9. Unscrew the center screw but leave the

spring washer. Remove the plain washer.
Then tighten the screw again to protect the
shaft during next operation.
10. Fit the puller tool and pull off the coupling.
G0191711

85
6.3 Dismantling 6 Dismantling/Assembly

11. Remove the round nut.

Note! Left-hand thread.

G0192311
12. Knock loose the worm wheel shaft by means
of a piece of wood and a tin hammer. Use
light blows from the motor side.

G0213411
13. Unscrew the round nut.

G0212611

14. Remove the ball bearing. Put some cotton

twist into the tool to avoid damage to the
shaft. The pressure should be applied to the
inner race of the ball bearing.
G0212711

86
6 Dismantling/Assembly 6.4 Assembly

6.4 Assembly

6.4.1 Assembly of horizontal

driving device, friction
coupling
1. Clean and oil the seat of the large ball
bearing on the worm wheel shaft.
2. Heat the large ball bearing to 100 °C (212 °F)
in oil or in an oven.
Mount the ball bearing on the shaft.
Use protective gloves.

G0192411
3. Apply some Loctite 242 on the threads of the
round nut. Lock the ball bearing in its position
by tightening the nut.

G0191611
4. Clean the ball bearing housing in the frame
and oil the outer race of the ball bearing.
Force the worm wheel shaft into its position in
the frame so that the ball bearing enters
correctly into its seat. Use the mounting
sleeve and the ring forcing the outer race of
the ball bearing.
G0213511

87
6.4 Assembly 6 Dismantling/Assembly

5. Fit the lock ring. Tighten it with the pin

spanner.
Note! Left-hand thread

G0246011
6. When mounting the brake pulley. See to it
that the key in the worm wheel shaft enters
into the recess in the nave of the pulley.
Lock the brake pulley in its position by means
of the plain washer, spring washer and centre
screw.

G0192011
7. Worm wheel assembly:
If the rubber bumpers have been replaced,
apply some Loctite 270 on the six screws.
Tightening torque=25 Nm.
Clean the worm wheel shaft and the inner
surface of the worm wheel nave thoroughly.
Carefully push the worm wheel into its
position on the shaft.
G0191911

8. Clean the inner surface of the nave of the

clamping element and oil it. The oil must be of
the same quality as is used in the gear
housing.
Slip the clamping element onto the worm
wheel. The tightening is described later in this
assembly instruction.
G0213811

88
6 Dismantling/Assembly 6.4 Assembly

9. Mount the ball bearing. Apply the mounting

tool and hit a few blows on the latter to
ascertain that the bearing is in the correct
position.
Clean the ball bearing housing in the end
shield. Press the shield into its position by
tightening its screws or by knocking
cautiously on the centre of the shield with a
tin hammer.

G0192111
10. Clean the bearing seat in the bearing shield.
Fit a new corrugated shim and O-ring into the
bearing shield.
11. Renew the gasket and fit the bearing shield.
Note that the shield only can be fitted in one

G08286B1
position only.
If necessary, pull it into position using the
screws or tap its centre with a tin hammer.

The remaining description in this section implies

that the bowl spindle is mounted into the frame. If
not, proceed with the instructions for the ‘‘6.4.2
Assembly of bowl spindle” on page 91.
12. Push the worm wheel on the horizontal shaft
into position for driving the bowl spindle.
13. First tighten the three clamp screws A, B and
C (see figure), but only so little that the
clamping element sticks on to the worm
wheel.
Then tighten all the screws uniformly and in
the order indicated in the order indicated in
the figure (1-12). Do not tighten crosswise.
Tightening torque: 29 Nm. This must be done
several turns around the clamping element
until it is impossible to turn the screws further
with the prescribed torque.
The catch of the dynamometric wrench is
immediately released. Check continuously
that the ring of the clamping element remains
plane parallel.
G0207811

89
6.4 Assembly 6 Dismantling/Assembly

14. Check the friction coupling. Clean or change

the friction pads, if needed, see ‘‘7.10 Friction
coupling” on page 140.
15. Fit the motor.
16. Check the axial play between the coupling
and motor, see ‘‘7.10 Friction coupling” on
page 140.

G0191811

90
6 Dismantling/Assembly 6.4 Assembly

6.4.2 Assembly of bowl spindle

At the regular Major Service, the bowl spindle is
assembled in the following way!
Before assembling the bowl spindle make sure
the checkings according to chapter ‘‘7 Check
points” on page 121 have been carried out.

NOTE
The bearings used for the bowl spindle are
specifically designed to withstand the speed,
vibration, temperature and load
characteristics of high-speed separators. Do
not use other bearings than those stated in
the Spare Parts Catalogue.
Do not re-fit a used bearing. Always replace
it with a new one.

1. Wipe off and oil the bearing seat before fitting

the ball bearing.

G0189011

91
6.4 Assembly 6 Dismantling/Assembly

2. Heat the upper and lower ball bearing

supports to 100 °C and mount them on the
top bearing.
Use protective gloves!

G0299011
3. Heat the top bearing assembly to 100 °C and
mount it on the spindle. Mount the oil fan as a
tool to secure the correct position of the top
bearing assembly.
Remove the oil fan after about 5 minutes.

G0189211
4. Place the top bearing cover and the upper
rubber buffer, the one without springs, upside
down in the mounting tube tool.
Lower the bowl spindle upside down in the
tube and adjust the parts into their positions.

G0189311

92
6 Dismantling/Assembly 6.4 Assembly

5. Place the lower rubber buffer with its springs

on the ball bearing holder.
Maximum admitted indentations in the
bearing holder and bearing support are
0,5 mm.

G0189411
G0190511
6. Fit a new O-ring in the top bearing cover.
Screw the top bearing support together with
the top bearing cover by tightening the three
screws.
G0188611

93
6.4 Assembly 6 Dismantling/Assembly

7. Mount the oil fan.

G0189511
8. Force the worm by hand onto the lower
cleaned tapered part of the bowl spindle.
Note! The worm should not be heated before
assembly.

G0189611
9. Fit the support washer.
Wipe off and oil the bearing seat before fitting
the roller bearing.

G0189711

94
6 Dismantling/Assembly 6.4 Assembly

10. Heat the bottom bearing to 100 °C (212 °F)

and mount it on the spindle.

S0038711
G0189911
11. Fit the spacing washer, the lock washer and
the round nut.

G0190011

95
6.4 Assembly 6 Dismantling/Assembly

12. Fasten the whole assembly with the round nut

and lock it with the lock washer.

G0190111
13. Fit new O-rings to the bottom bearing housing
and fit the bottom bearing housing to the
frame

G0259571
14. Fit a new gasket in the frame top part.
Note! The old one must be completely
removed.
Lift the bowl drive cartridge into the frame
with the lifting tool.

G0188111

15. Fasten the bowl drive cartridge in the frame

with the six screws.
Note! The screws must be locked with
Loctite 242.
G0188011

96
6 Dismantling/Assembly 6.4 Assembly

16. Fit a rubber ring in the frame top part.

G0187911
17. Mount the guard and tighten the six screws.

G0187811
18. Mount the protecting collar and the O-ring.
Note! The collar must rest against the thrust
collar on the bowl spindle.

G0187711
19. Mount the protecting plate and tighten the
three screws.
Note! Do not tighten too hard because the
protecting collar is made of brass.
G0187611

97
6.4 Assembly 6 Dismantling/Assembly

20. Mount the hood above the top bearing.

Tighten the screws.
Measure the height. Adjust if necessary. See
‘‘7.15 Height position of operating water
device” on page 143
Rotate the spindle and check for smooth run.
No scrapings or other jarring sounds must be
heard.

G0187511
21. Push the worm wheel on the horizontal shaft
into position for driving the bowl spindle.
Fix the worm wheel: First tighten the three
clamping element screws A, B and C (see
figure), but only so little that the clamping
element sticks onto the worm wheel.
Then tighten all the screws uniformly and in
the order indicated in the figure (1-12). Do not
tighten crosswise. Tightening torque: 29 Nm.
This must be done several turns around the
clamping element until it is impossible to turn
the screws.
The catch of the dynamometric wrench is
immediately released. Check continuously
that the ring of the clamping element remains
plane-parallel.

G0207811
22. Mount the cover and the oil drain plug. G0127911

98
6 Dismantling/Assembly 6.4 Assembly

23. Fill new oil into the worm gear housing. The
oil level should reach the middle of the sight
glass. For correct oil quality, see ‘‘5.2.1
Lubrication chart, general” on page 48.
Mount the oil plug.

G0208011

99
6.4 Assembly 6 Dismantling/Assembly

6.4.3 Assembly of disc stack and

disc inlet
1. Check that the discs of the disc inlet are
completely clean. Assemble the disc inlet.
Insert the disc inlet into the distributor.
Note the guide lug!
Tighten the three screws.

G0186011
2. Put a number of discs on the top of the
distributor. Turn the discs till they find their
proper position, that is where they fit into the
guidings and fall down in order on the
distributor.
G0185911

100
6 Dismantling/Assembly 6.4 Assembly

6.4.4 Assembly of operating water

device
All O-rings should be lubricated with silicone
grease before assembly.
1. Fit the rectangular ring on the piston.
Fit the O-ring on the distributing ring.
Assemble the piston and the distributing ring.

G0186111
2. Fit the outer O-ring on the upper part of the
distributing ring.
Fit the three small O-rings into their grooves.
3. Turn the distributing ring so that the piston
points downwards and assemble the
distributing ring and the upper part.

G0186211
4. Fit the outer O-ring on the bottom part.
Fit the three small O-rings in their grooves in
the bottom part of the distributing ring.
Assemble the bottom and centre parts of the
distributing ring.

G0186311
6.4.5 Assembly of wear liners in
the bowl
1. Place the liner blank in the sediment port.
S0032011

2. Fasten the tool between the sediment ports

as shown in the illustration and clamp the
liner blank with it.
G0298611

101
6.4 Assembly 6 Dismantling/Assembly

3. Tighten the tool nut with a spanner until the

liner is firmly pressed to its seat.

G0298711
4. Bend the shank A at right angles to the
outside of the bowl wall by using a drift.

G0298911
5. Knock shank A flat against the wall of the
port.

S0031811
6. Remove the tool and check that the wear liner
is well attached and that the shank A does
not protrude beyond the bowl periphery.
Fit the other liners as described above.

G0298811

6.4.6 Assembly of discharge

mechanism and bowl body
1. Check that the three valve plugs are in order
in their seats and that the O-ring is properly fit
and lubricated in the operating slide.
2. Fit the operating slide on the bowl body.
Note the guide lug!
G0186411

102
6 Dismantling/Assembly 6.4 Assembly

3. Fit the O-ring. Lay the dosing ring - the tool

fitted - on the bowl body. Screw the dosing
ring on the bowl body by hitting with the tin
mallet.
Tighten till the φ marks on dosing ring and
bowl body are aligned.

G0259011
4. Fit the O-ring and the operating water device
on the bowl body and tighten the three
screws.

G0185311
5. Check the spindle height before fitting the
bowl body, see ‘‘7 Check points” on page 121
6. Turn the bowl body over (by fitting a strap
through a sludge port and using the hoist).
Apply a few drops of oil to the bowl spindle
taper of corrosion protecting reasons.
Wipe off with a dry cloth.
7. Fit the bowl body lifting tool and the eye bolt.
Lift the bowl body into the frame. Center
carefully and lower the bowl body slowly onto
the spindle top.
Remove the eye bolt and the other tool.
G0185211

103
6.4 Assembly 6 Dismantling/Assembly

8. Fit the lining and the small O-rings in the

sliding bowl bottom.
Fit the third O-ring to the clampring, screw the
clampring on the sliding bowl. Use the
clampring spanner.
Use a tin mallet. Hit the spanner pins.
Note! Left-hand thread!

G0477411
9. Fit the rectangular ring on the sliding bowl
bottom and lubricate with silicone grease.
Fit the lifting tool and lift the sliding bowl
bottom into the bowl body.
Take care that the guide pin in the bowl body
fits into the corresponding hole in the sliding
bowl bottom.

G0184911
10. Lubricate and fit the O-ring in the groove
between the bowl body and the sliding bowl
bottom. G0186611

11. Lift the distributing cone into the bowl, and fit
properly onto the guide lugs.
Remove the eye bolt.
G0184611

104
6 Dismantling/Assembly 6.4 Assembly

12. Fit the O-ring on the centre screw and tighten

the centre screw.
Note! Left-hand thread!

G0299111
6.4.7 Assembly of disc stack,
bowl hood, inlet/outlet
1. Fit an eye bolt and lift the distributor with the
disc stack. Match with the guide lugs when
lowering it into the bowl.
Remove the eye bolt.

CAUTION

Cut hazard

Sharp edges on separator discs may cause

cuts.

G0184411
2. Check that the O-ring and the seal ring of the
bowl hood are properly fitted and lubricated.
Screw the bowl-hood tool onto the bowl hood
and lift it by hoist. When the bowl hood is
lowered onto the bowl body take care that
− the guide lug on the body enters the
corresponding groove in the hood and
− that the bowl hood is lowered straight
down onto the disc stack. Otherwise it
may get stuck.
G0184311

105
6.4 Assembly 6 Dismantling/Assembly

3. Use the hoist to fit the large lock ring - its tool
on.

G0186721
4. Fit the compressing tool. Screw the pole of
the tool into the threads of the distributor by
means of the lever arm.
Turn the switch to position for compression.

G0284421

106
6 Dismantling/Assembly 6.4 Assembly

5. Compress the disc stack by pumping with the

lever arm until the sound of oil flowing
through the relief valve is heard.

G0284521
6. Tighten the large lock ring by hand till the
φ marks on the lock ring and the bowl body
are almost aligned. Do the final tightening by
means of the tin mallet.
Note! Left-hand thread!

WARNING

Disintegration hazards

G0184221
Wear on large lock ring thread must not
exceed safety limit. φ-mark on lock ring must
not pass opposite φ-mark by more than the
specified distance.

See further chapter ‘‘7.17 Disc stack

pressure” on page 146.
Remove the tools.

107
6.4 Assembly 6 Dismantling/Assembly

7. Fit the O-ring.

Lubricate and insert the paring disc with inlet
pipe.

G0186811
8. Fit the wing insert.

G0183711
9. - the seal disc

G0183611

108
6 Dismantling/Assembly 6.4 Assembly

10. - the O-ring and the paring chamber cover.

G0186911
11. Fit the special tool to the small lock ring and
screw the small lock ring onto the bowl hood
top.
Note! Left-hand thread!
Give the tool some light blows with a tin
mallet for the final tightening.
Remove the special tool.

G0187011
12. Check the seal strip in the frame. Lift the
frame hood by hoist and lower it onto the
frame. Let the safety lock switch serve as a
guide for the correct positioning and make
sure that the cooling-water pipe fits into its
hole.

G0183311

109
6.4 Assembly 6 Dismantling/Assembly

13. Fit the 12 fastening bolts. Tighten them

crosswise by hand.
Do not use a machine for tightening these
bolts.

G0187111
14. Before fitting the discharge cover measure
the height of the paring disc
Correct height, see ‘‘7.18 Height position of
paring disc” on page 147.
15. Adjust the height by adding height adjusting
rings.

G0187211
NOTE
Incorrect height will cause the paring disc to
scrape against the rotating bowl.

16. Fit the discharge cover on the frame hood.

G0183111

110
6 Dismantling/Assembly 6.4 Assembly

17. Insert the inlet pipe with the two O-rings.

Tighten it by means of the hook key.

G0187311
18. Fit the angle pipe and the rectangular ring in
the correct direction before tightening with the
other hook key.
Connect inlets and outlets to the separator.

G0182911

111
6.5 Exchange of brake lining 6 Dismantling/Assembly

6.5 Exchange of brake

lining
A worn or oily lining will lengthen the braking
period.

CAUTION
Inhalation hazard

When handling friction blocks/pads use a

dust mask to make sure not to inhalate any
dust.
Do not use compressed air for removal of
any dust. Remove dust by vacuum or wet
cloth.
See Safety instructions for environmental
issues regarding correct disposal of used
friction blocks/pads.

• Remove the brake cover.

G0134011

If the lining is worn:

− Remove the screws and exchange the
lining.
Note! The screws are slotted in both
ends.
G0134111

112
6 Dismantling/Assembly 6.5 Exchange of brake lining

If the lining is oily:

− Clean the lining and the coupling drum
with a suitable degreasing agent.
− Roughen the friction surface of the lining
with a coarse file.

G0134211
Checking of spring and brake shoe:
Formation of rust on the brake parts may cause
the brake to jam.
• Remove any rust from the surface (1) of the
brake shoe and the corresponding guiding
surface in the cap (2).
• Rub the surfaces for instance with Molykote
Paste.
•

G0134311
Replace the spring (3) if it has lost its
stiffness.
• Oil the spring when assembling.

113
6.6 Exchange of coupling pads 6 Dismantling/Assembly

6.6 Exchange of coupling

pads
• Worn or oily pads will cause a long
acceleration period.
Replace all pads even if only one is worn.

CAUTION
Inhalation hazard

G0257511
When handling friction blocks/pads use a
dust mask to make sure not to inhalate any
dust.
Do not use compressed air for removal of
any dust. Remove dust by vacuum or wet
cloth.
See Safety instructions for environmental
issues regarding correct disposal of used
friction blocks/pads.

If the pads are oily: clean the pads and the inside
of the coupling drum with a suitable degreasing
agent. Roughen the friction surfaces of the pads
with a coarse file.
• Remove the motor. The friction blocks are
mounted on the motor coupling pulley.

G0257611

• Exchange the friction pads. Note that the

screws are slotted in both ends.
Exchanging can be done without removing
the friction blocks from the coupling pulley.
G0257711

114
6 Dismantling/Assembly 6.7 Lifting and transport instruction

6.7 Lifting and transport

instruction
Specification
• During the lifting and transport of a separator
the in- and outlet device, the frame hood
and the bowl must always be taken out of the
machine for separate transport.
• When lifting a separator it must always be

G0000111
hung safely as in the illustration.

WARNING

Crush hazards

Incorrect lifting methods may be dangerous

to personnel and cause damage.

When lifting parts without weight specifications,

always use lifting slings with a lifting capacity of at
least 500 kg.
• During installation, all inlets and outlets to the
separators and accessories must be covered
to be protected from dirt and dust.
Machine weight excluding bowl, frame hood and
inlet and outlet device is approx 1000 kg.
Weight of bowl: 300 kg.

G0583311

AB. = 3 adjustable slings

AC. = Max 12mm

115
6.8 Exchange of frame feet 6 Dismantling/Assembly

6.8 Exchange of frame

feet
Remove the nuts (3,4). Lift the frame.
See ‘‘6.7 Lifting and transport instruction” on page
115.
Exchange the vibration dampers (1,2) and lower
the frame.
Tighten the nuts (3) till they touch the cup covers.
Then tighten with 20 Nm.
Hold the nuts (3) firmly and secure with the lock
nuts (4).
Service interval ≈ 3 - 4 years.

G0258911

116
6 Dismantling/Assembly 6.9 Vibration sensor

6.9 Vibration sensor

The vibration sensor is placed in the upper part of
the frame.

G0262511
1. Vibration sensor
2. Junction box

6.9.1 Replacing vibration sensor

To exchange the complete sensor proceed as
follows:
1. Disconnect the vibration sensor cables in the
junction box.
2. Install the new vibration sensor.
3. Connect the cables in the junction box
Connections, see ‘‘8.5 Drawings” on page
156.

117
6.10 Speed sensor 6 Dismantling/Assembly

6.10 Speed sensor

The speed sensor is mounted to the right inside
the brake cover. If the sensor has been damaged
or if the current is out of stated value, change the
complete sensor.

G0262311
1. Speed sensor
2. Junction box

6.10.1 Replacing the speed sensor

1. Remove the brake cover.
2. Disconnect the cables of the speed sensor in
the junction box.
3. Loosen the two nuts and remove the speed
sensor.
4. Install the new speed sensor.
5. Pull the cable into the junction box and
connect.
Connections, see ‘‘8.5 Drawings” on page
156.
6. Adjust the sensor distance, see ‘‘6.10.2
Adjustment of speed sensor distance” on
page 119.
7. Replace the brake cover.

118
6 Dismantling/Assembly 6.10 Speed sensor

6.10.2 Adjustment of speed sensor

distance
Incorrect speed sensor position may cause
incorrect speed monitoring. For access to the
speed sensor remove the brake cover.
The position of the speed sensor should be
checked if the bowl spindle or the speed sensor
has been dismantled or replaced.
• Adjust the distance between the speed
sensor and the brake pulley. The distance
“near” i.e. between two slots: 2 ±0,5 mm.
• Tighten the speed sensor with a torque of
max 50 Nm.

G0245911

119
6.10 Speed sensor 6 Dismantling/Assembly

120
7 Check points

Contents

7.1 IS - Intermediate service 122 7.9 Threads of inlet pipe, threads of

7.1.1 Corrosion 122 paring disc 139
7.1.2 Erosion 124
7.1.3 Cracks 126 7.10 Friction coupling 140

7.2 Worm wheel and worm 127 7.11 Radial wobble of bowl spindle 141
7.2.1 Tooth appearances examples 128
7.12 Radial wobble of worm wheel
7.3 Guiding surfaces 129 shaft 142
7.3.1 Check of guiding surfaces 129
7.3.2 Repair of galling on guiding surfaces130 7.13 Radial wobble of motor shaft 143

7.4 Spindle top and bowl body nave 132 7.14 Ball bearing housing 143

7.5 Discharge mechanism 133 7.15 Height position of operating water

7.5.1 Bowl body 133 device 143
7.5.2 Dosing ring 133
7.5.3 Operating slide 133 7.16 Priming of large lock ring 144
7.5.4 Valve plugs 133
7.17 Disc stack pressure 146
7.6 Bowl sealings 134
7.6.1 Bowl hood seal ring 134 7.18 Height position of paring disc 147
7.6.2 Seal ring of sliding bowl bottom 135

7.7 Threads of lock ring and bowl hood

136

7.8 Wear liners 138

7.8.1 Erosion liner in the bowl 138
7.8.2 Wear liners in the bowl 138

121
7.1 IS - Intermediate service 7 Check points

7.1 IS - Intermediate
service

7.1.1 Corrosion
Evidence of corrosion attacks should be looked
for and rectified each time the separator is
dismantled. Main bowl parts such as the bowl
body, bowl hood and lock ring must be inspected
with particular care for corrosion damage.

WARNING

Disintegration hazard

G0206111
Inspect regularly for corrosion damage.
Inspect frequently if the process liquid is
corrosive.

Always contact your Alfa Laval representative if

you suspect that the largest depth of the
corrosion damage exceeds 1,0 mm or if cracks
have been found. Do not continue to use the
separator until it has been inspected and given
clearance for operation by Alfa Laval.
Cracks or damage forming a line should be
considered as being particularly hazardous.

Non-stainless steel and cast iron parts

Corrosion (rusting) can occur on unprotected
surfaces of non-stainless steel and cast iron.
Frame parts can corrode when exposed to an
aggressive environment.

122
7 Check points 7.1 IS - Intermediate service

Stainless steel
Stainless steel parts corrode when in contact with
either chlorides or acidic solutions. Acidic
solutions causes a general corrosion. The
chloride corrosion is characterised by local
damage such as pitting, grooves or cracks. The

S0020611
risk of chloride corrosion is higher if the surface is:
• Exposed to a stationary solution.
• In a crevice.
• Covered by deposits.
• Exposed to a solution that has a low pH
value.
A corrosion damage caused by chlorides on
stainless steel begins as small dark spots that
can be difficult to detect.
1. Inspect closely for all types of damage by
corrosion and record these observations
carefully.
2. Polish dark-coloured spots and other
corrosion marks with a fine grain emery cloth.

S0020511
This may prevent further damage.

WARNING

Disintegration hazard

Pits and spots forming a line may indicate

cracks beneath the surface.
All forms of cracks are a potential danger
and are totally unacceptable.
Replace the part if corrosion can be
suspected of affecting its strength or
function.

Other metal parts

Separator parts made of materials other than
steel, such as brass or other copper alloys, can
also be damaged by corrosion when exposed to
an aggressive environment. Possible corrosion
damage can be in the form of pits and/or cracks.

123
7.1 IS - Intermediate service 7 Check points

7.1.2 Erosion
Erosion can occur when particles suspended in
the process liquid slide along or strike against a
surface. Erosion can become intensified locally by
flows of higher velocity.

WARNING

G0205211
Disintegration hazard

Inspect regularly for erosion damage.

Inspect frequently if the process liquid is
erosive.

Always contact your Alfa Laval representative if

the largest depth of any erosion damage exceeds
1,0 mm. Valuable information as to the nature of
the damage can be recorded using photographs,
plaster impressions or hammered-in lead.
Erosion is characterized by:
• Burnished traces in the material.
• Dents and pits having a granular and shiny
surface.
Surfaces particularly subjected to erosion are:
1. The upper paring disc.
2. The top disc.
3. The pillars between the sludge ports in the
bowl wall.
4. The sealing edge of the sliding bowl bottom.
5. The underside of the distributor in the vicinity
of the distribution holes and wings.
6. The surface of the sliding bowl bottom that
faces the conical part of the distributor.
7. The sealing edge of the bowl body for the
G0581311

seal ring in the sliding bowl bottom.

Look carefully for any signs of erosion damage.
Erosion damage can deepen rapidly and
consequently weaken parts by reducing the
thickness of the metal.

124
7 Check points 7.1 IS - Intermediate service

WARNING

Disintegration hazard

Erosion damage can weaken parts by

reducing the thickness of the metal.
Pay special attention to the pillars between
the sludge ports in the bowl wall.
Replace the part if erosion can be suspected
of affecting its strength or function.

Wear and erosion liners in the bowl!

The wear liners protect both the wall pillars in the
bowl body and the sliding bowl bottom. They must
be replaced before the liner has been perforated
by erosion.

125
7.1 IS - Intermediate service 7 Check points

7.1.3 Cracks
Cracks can initiate on the machine after a period
of operation and propagate with time.
• Cracks often initiate in an area exposed to
high cyclic material stresses. These are
called fatigue cracks.
• Cracks can also initiate due to corrosion in an
aggressive environment.
• Although very unlikely, cracks may also occur
due to the low temperature embrittlement of
certain materials.
The combination of an aggressive environment
and cyclic stresses will speed-up the formation of
cracks. Keeping the machine and its parts clean
and free from deposits will help to prevent
corrosion attacks.

WARNING

Disintegration hazard

All forms of cracks are potentially dangerous

as they reduce the strength and functional
ability of components.
Always replace a part if cracks are present.

It is particularly important to inspect for cracks in

rotating parts and especially the pillars between
the sludge ports in the bowl wall.
Always contact your Alfa Laval representative if
you suspect that the largest depth of the damage
exceeds 1,0 mm. Do not continue to use the
separator until it has been inspected and cleared
for operation by Alfa Laval.

126
7 Check points 7.2 Worm wheel and worm

7.2 Worm wheel and

worm

Check at each oil change.

Check the teeth of worm wheel and worm for
wear.
Examine the contact surfaces and compare the
tooth profiles.
The gear may work satisfactorily even when worn
to some degree.
• Replace worm wheel and worm at the same
time, even if only one of them is worn.

G0205311
• To avoid damaging the teeth when lifting the
bowl spindle, first push the worm wheel aside.
1. Worm
Put the spindle in place before mounting the 2. Worm wheel
worm wheel.

WARNING

Disintegration hazard

Check that gear ratio is correct for power

frequency used. If incorrect, subsequent
overspeed may result in a serious

G0205411
breakdown.

NOTE
Presence of metal chips in the oil bath is an
indication that the gear is wearing
abnormally.

127
7.2 Worm wheel and worm 7 Check points

7.2.1 Tooth appearances

examples

Satisfactory teeth:
Uniform wear of contact surfaces. Surfaces are
smooth.
Good contact surfaces will form on the teeth when

G0538711
the gear is subjected only to moderate load
during a running-in period.

Worn teeth:
Permissible wear is as a rule 1/3 of the thickness
of the upper part of a tooth, provided that
• the wear is uniform over the whole of the flank

G0538811
of a tooth
• and all teeth are worn in the same way.

Spalling:
Small bits of the teeth have split off, so-called
spalling. Generally due to excessive load or
improper lubrication. Damage of this type need

G0538911
not necessitate immediate replacement, but
careful checking at short intervals is imperative.

Pitting:
Small cavities in the teeth, so-called pitting. Can
occur through excessive load or improper
lubrication. Damage of this type need not
necessitate immediate replacement, but careful
G0539011

check at short intervals is imperative.

128
7 Check points 7.3 Guiding surfaces

7.3 Guiding surfaces

7.3.1 Check of guiding surfaces

• Check surfaces indicated A for burrs.
Remedy when necessary.
• Check surfaces indicated B and C for galling.
Repair if necessary.
• Prime surfaces indicated B and C with
lubricating spray Molykote 321 R. Proceed in
the same way as for the large lock ring, see
‘‘7.16 Priming of large lock ring” on page 144.
• Lubricate surfaces indicated B and C with
Molykote 1000 Paste after priming.

1. Sliding bowl bottom G0190611

2. Bowl body
3. Operating slide
4. Dosing ring
5. Hydraulic piston

129
7.3 Guiding surfaces 7 Check points

7.3.2 Repair of galling on guiding

surfaces
Galling (friction marks) may appear on guiding
surfaces of the bowl discharge mechanism, the
bowl body and the sliding bowl bottom. Surfaces
subject to repair are indicated by an arrow.
The example below describes the repair of the

G0205511
lower guiding surface of the bowl body nave.
Recommended tools for correction of galling:
Emery cloth, 240 grade.
Hand drilling machine.
Degreasing agent.
Fibre brush, ø 25 mm.
Fibre brush, ø 50 mm.
Very fine single-cut file.
1. Clean the surface thoroughly with a
degreasing agent, i.e. white spirit. This is
important.

G0205611
2. If the galling is excessive, first use the fine
single-cut file. The file should be used with
caution so that the damage is not made
worse.
Remove the high spots on the surface. Do not
use rotating files or similar. Remove the high
spots only - not the undamaged material.
G0205711

3. A fine grain emery cloth of 240 grade should

be used to smooth the edges and to remove
any burnt-in foreign matter.
G0205811

130
7 Check points 7.3 Guiding surfaces

4. Finish off by polishing the damaged spot with

the fibre brushes and brush wax. It is
recommended that the whole area where
galling may occur should be polished.
Polishing will help smoothen the whole of the
damaged area, even in the deepest parts.

G0205911
5. Prime the repaired area with lubricating spray
Molykote 321 R. Read the correct procedure
under ‘‘7.16 Priming of large lock ring” on
page 144. Apply Molykote 1000 Paste onto
the surface after priming.

131
7.4 Spindle top and bowl body nave 7 Check points

7.4 Spindle top and bowl

body nave
Impact marks on the spindle cone or in the bowl
body nave may cause bad bowl run.
The bowl spindle and the nave should also be
checked if the bowl spindle has been dismantled
or if the bowl runs roughly.
• Remove any impact marks with a scraper
and/or whetstone.
Rust can be removed by using a fine-grain
emery cloth (e.g. No 320).
Finish with polishing paper (e.g. No 600).

NOTE
Always use the scraper with great care. The
conicity must not be marred.

G0206011

132
7 Check points 7.5 Discharge mechanism

7.5 Discharge
mechanism
Dirt and lime deposits in the sludge discharge
mechanism may cause bad discharge function, or
none at all. Clean and polish surfaces with steel
wool if necessary, see below.

7.5.1 Bowl body

• Check the nozzles (A). (Polish the surface (1)
with steel wool).
• Examine the three sealing surfaces (3) of the
bowl body which are in contact with the valve
plugs. Remove any marks and lime deposits
with a very fine-grain emery cloth.

7.5.2 Dosing ring

• Polish the surface (1) with steel wool.
• Inspect the surface (2) in contact with the
operating slide. Remove any marks with
whetstone (grain size 240).

G0190711
7.5.3 Operating slide
A. Nozzle
Inspect the guiding surface (4) in contact with the B. Bowl body
dosing ring and the surface (5) in contact with the C. Operating slide
bowl body. Remove any marks with whetstone D. Dosing ring
(grain size 240). E Valve plug

7.5.4 Valve plugs

• Exchange the valve plugs (E).
Tap in the new plugs with a rubber mallet.

133
7.6 Bowl sealings 7 Check points

7.6 Bowl sealings

Check every 2000 operating hours or

3 months

7.6.1 Bowl hood seal ring

Poor sealing between the bowl hood seal ring and
the sealing edge of the sliding bowl bottom will
cause a leakage of process liquid from the bowl.
Replace the bowl hood seal ring at each
intermediate service (IS) if the ring is damaged or
indented more than 1 mm.

G0206211
If the seal ring needs replacement, force out the
ring by means of a pin, inserting it in the holes
intended for this purpose.

G0206311

Fit the new ring as follows:

Press the ring into the groove with a straight
board (1” x 4”), placed across the ring.

NOTE
If a new ring is too narrow, put it into hot
G0206411

water, 70-80 °C for about 5 min.

If it is too wide it will recover after drying in
80-90 °C for about 24 hours.

134
7 Check points 7.6 Bowl sealings

7.6.2 Seal ring of sliding bowl

bottom
If the seal ring of the sliding bowl bottom is to be
replaced and compressed air is available, turn the
sliding bowl bottom upside down and inject
compressed air through the hole on the
underside. This will press the ring outwards far
enough to be easily gripped.

G0207511

135
7.7 Threads of lock ring and bowl hood 7 Check points

7.7 Threads of lock ring

and bowl hood
Excessive wear or impact marks on threads and
guiding surfaces of the lock ring, bowl hood or
bowl body may cause hazardous seizure
damage.
• Check the thread condition by tightening the
bowl hood after removing the disc stack with
top disc from the bowl and the O-ring from the
bowl hood.
• In a new bowl the alignment marks on the
lock ring and the bowl body should be
aligned.

G0207411
If thread wear is observed, mark the bowl body at
the new position by punching a new alignment
mark. If the mark on the lock ring passes the
corresponding mark on the bowl by more than
25°C, an Alfa Laval representative must be
contacted immediately.
If the marks are not legible, an Alfa Laval
representative should be contacted for
determination and punching of new alignment
marks.

136
7 Check points 7.7 Threads of lock ring and bowl hood

Damage
Position of threads, contact and guiding surfaces
are indicated by broad lines in the illustration.
• Check for burrs and protrusions caused by
impact.
Watch your fingers for sharp edges!
• If damage is established, rectify by using a
whetstone or fine emery cloth.
Recommended grain size 240.
• If the damage is considerable use a fine
single cut file, followed by a whetstone.

G0284611
A. Lock ring
B. Bowl hood
C. Bowl body

G0207711

137
7.8 Wear liners 7 Check points

7.8 Wear liners

7.8.1 Erosion liner in the bowl

Check the edge of the erosion liner for damage,
corrosion or erosion.
Maximum permitted reduction of the original
profile height: 0,5 mm.

G0481111
7.8.2 Wear liners in the bowl
When fitting the liners keep in mind that they will

G0207611
be subjected to a very high service stress. It is
essential, therefore, that the liners are mounted
carefully in full agreement with the instructions,
see ‘‘6.4.5 Assembly of wear liners in the bowl” on
page 101. The wear liners are made of 1 mm
stainless, cold-rolled sheet metal according to the
adjoining sketch.

138
7 Check points 7.9 Threads of inlet pipe, threads of paring disc

7.9 Threads of inlet pipe,

threads of paring disc
Damage to the threads of the inlet pipe or the
internal threads of the paring disc may cause
incorrect positioning of the paring disc in the
paring chamber, even though the height
adjustment of the paring disc has been made
correctly.
• Check the threads for damage and rectify if
required.

G0191011

139
7.10 Friction coupling 7 Check points

7.10 Friction coupling

Check friction pads for wear and replace if
necessary.
All pads must be replaced at the same time, even
if only one is worm.
The axial play should be 3 mm (approx.).
Check the play as follows:
1. Measure the distance, A, from motor frame
ring to coupling disc of the separator.
2. Measure the distance, B, from motor frame
ring to motor coupling disc.
3. A mm - B mm = 3±1 mm
If required, adjust the position of the motor
coupling disc.

G0191111

140
7 Check points 7.11 Radial wobble of bowl spindle

7.11 Radial wobble of bowl

spindle
The bowl spindle wobble should also be checked
if the bowl spindle has been dismantled or if
rough bowl run (vibration) occurs.

NOTE
Spindle wobble may cause vibration and
reduce life of ball bearings.

Check the wobble before mantling the spindle.

Before measuring make sure the buffer plugs are
properly tightened.
• Fit a dial indicator in a support and fasten it to
the frame.
• Measure the wobble at the top of the tapered
end of the spindle
Maximum permissible radial wobble:
0,04 mm.
• Remove the brake cover to get access to the
coupling drum. Use the coupling drum to
revolve the spindle manually.
• If wobble is too large: replace rolling bearings
in top and bottom bearings.

G0191511
Measure wobble after assembly. If it is still
excessive, the spindle is probably damaged
and must be replaced.

141
7.12 Radial wobble of worm wheel shaft 7 Check points

7.12 Radial wobble of

worm wheel shaft
Excessive wobble on the worm wheel shaft may
cause vibration and noise.
Clamp a dial indicator in a magnetic support and
fasten the latter to the plane for the worm wheel
guard (the gasket should be removed). Revolve
the worm wheel shaft by hand.
Maximum permissible radial wobble is 0,1 mm.
If the wobble is excessive, the worm wheel shaft
must be removed from the frame for closer
examination. Get in touch with your Alfa Laval
representative. The worm wheel shaft may need
to be replaced.

G0246111

142
7 Check points 7.13 Radial wobble of motor shaft

7.13 Radial wobble of

motor shaft
Excessive wobble on the motor shaft may cause
vibration and noise.
Clamp dial indicator in a magnetic support, and
fasten the latter to the flange of the motor.
Revolve the motor shaft by hand. Read the
wobble on the shaft according to measurement in
the figure.
Maximum permissible radial wobble 0,10 mm
If the wobble is excessive, contact an Alfa Laval
representative.
Check the wobble as a preventive measure in
connection with major service.

G0192211
7.14 Ball bearing housing
• Examine the contact surface for the buffers
on the ball bearing housing.
In case of defects indentions deeper than
0,5 mm replace the housing as well as buffers
and springs.

G0190511
7.15 Height position of
operating water
device
The height position should also be checked if the
bowl spindle has been dismantled.
• Measure the distance according to the
picture. If necessary adjust to correct height
by adding height adjusting rings under the
guard.
G0191221

143
7.16 Priming of large lock ring 7 Check points

7.16 Priming of large lock

ring
The arrows indicate positions of threads, guiding
and contact surfaces to be primed.

NOTE
The procedure of priming also applies to the
discharge mechanism.

Recommended agents for priming procedure:

Degreasing agent
Lubricating spray Molykote 321 R
Hand drilling machine
2 fibre brushes
1. Clean the lock ring thoroughly with a
degreasing agent and wipe it.

G0206911

2. Spray the threads, guiding and contact

surfaces with lubricating spray
Molykote 321 R. Let the ring dry for about
15 minutes.
G0207011

144
7 Check points 7.16 Priming of large lock ring

3. Use a fibre brush to polish the Molykote into

the surface. The black spray will look like well
polished black shoe cream when properly
polished.

G0207111
4. Spray the lock ring a second time and let it
dry for about 15 minutes.

G0207211
5. Polish the Molykote to a black shining surface
which now can last about one year.

NOTE
Never use the same brush as in the previous
operation.

Proceed in the same way with the threads of the

bowl body and with the guiding surfaces of sliding
G0207311

bowl bottom, bowl body, operating slide and

dosing ring.

145
7.17 Disc stack pressure 7 Check points

7.17 Disc stack pressure

NOTE
Ensure that the disk stack pressure is
sufficient to maintain bowl balance.
Insufficient pressure in the disk stack can
cause vibration and reduce life of ball
bearings.

The lock ring (1) should press the bowl hood (2)
firmly against the bowl body (3). The hood in turn
should exert a pressure on the disc stack (4),
clamping it in place.

G0191311
1. Lock ring
2. Bowl hood
3. Bowl body
4. Disc stack

Compress the disc stack by using the

compression tool, see ‘‘6.3.4 Dismantling of disc
stack and disc inlet” on page 77 and ‘‘6.4.3
Assembly of disc stack and disc inlet” on page
100.
Correct pressure is obtained when it is possible to
tighten the lock ring so far by hand that the
φ-mark on the lock ring is positioned 10° - 30°
before the mark on the bowl body. To achieve this,
add an appropriate number of discs to the top of
G0135811

the disc stack beneath the top disc.

Then advance the ring by giving the spanner
handle some light blows till the φ-marks are
aligned.

146
7 Check points 7.18 Height position of paring disc

7.18 Height position of

paring disc
The height position of the paring disc should also
be checked if the bowl spindle has been
dismantled or if the bowl has been replaced

NOTE
Ensure the height is correctly adjusted.
Incorrect height will cause the paring disc to
scrape against the rotating bowl.

The height position of the paring disc is checked

when the bowl has been completely assembled
and the frame hood has been fixed in its place
with the hinged bolts.
Pay attention of scraping noises at the start-up.

G0321611

A. Height adjusting ring

B. Paring disc

147
7.18 Height position of paring disc 7 Check points

148
8 Technical References

Contents

8.1 Product desription 150

8.2 Technical data 151

8.3 Paring disc capacity 153

8.4 PX Sealing diagram 154

8.5 Drawings 156

8.5.1 Basic size drawing 156
8.5.2 Separator connections 157
8.5.3 Connections list 158
8.5.4 Interface description 161
8.5.5 Foundation 166
8.5.6 Electric motor 167

8.6 Interconnection diagram 168

8.6.1 Discharge valve 169
8.6.2 Speed sensor 170
8.6.3 Vibration sensor 171
8.6.4 Discharge valve 172
8.6.5 Lock switch 173

8.7 Demand specification,

service water 174

8.8 Demand specification,

compressed air 175

8.9 Identification and safety signs on

machine 176

149
8.1 Product desription 8 Technical References

8.1 Product desription

Alfa Laval ref. 557268, rev. 5

Product number 881150-01-03/4

Separator type VNPX 710SGD-34GLG
Application Wine and wine must.
Technical design Clarifier with fixed partial discharge system.
Water cooled jacket.
Hydraulic hermetic seal.
Designed in accordance with standards 98/37/EC Machinery directive
EN 292-2 Safety of machines. Use of the machine
in applications subject to hygienic
demands requires a well adapted
cleaning program.
89/336 EEC EMC and amendments related to said
directive.
Restrictions Feed temperature: 0 °C to +100 °C.
Hydraulic capacity: 20 m3/h
Discharge intervals: 1 - 60 minutes
Max. running time without throughput (stand by):
- Empty or filled bowl: 180 minutes
Ambient temperature: +0 to +35 °C.
Only land based installations are permitted.
Bowl must be kept filled during stop sequence.
Risk for corrosion and erosion has to be investigated
in each case by the application centre.
Further restrictions and instructions are found in other
chapters in this manual.

150
8 Technical References 8.2 Technical data

8.2 Technical data

Alfa Laval ref. 555600, rev. 3

Throughput capacity Maximum hydraulic capacity 20 000 l/h

Motor 22 kW standard motor for 380/660 V, 50 or 60 Hz 3-phase AC

Working power
Depending on throughflow and 5 000 l/h approx. 14 kW
outlet pressures. 15 000 l/h approx. 18 kW

Speed The prescribed speed of the worm wheel shaft, which must
not be exceeded, is stamped on the name plate of the
machine

The table indicates maximum 50Hz 60Hz

permissible speed of rotation
(rpm): Drive motor 1500 1800
Bowl 7432 7488
Revolution counter 125 150
Gear ratio 109:22 104:25

Running up time 4 - 5 min

Stopping time
Running out with brake applied 9 - 11 min (min. - max.)
Running out without brake 57 min (average)

Outlet pressure Recommended outlet pressure 700 kPa

Sediment space volume Approx. 6,6 litres

Discharge volume Nom. discharge volume 6 litres

Discharge interval Depending on process. Minimum interval 1 min

Oil volume Lubricating oil volume 8,0 litres

Feed temperature 0/100 min/max °C

151
8.2 Technical data 8 Technical References

Material There are other materials than stainless steel in contact with
process liquid

Water consumption
Operating water: approx. 2 litres/discharge
Water for cooling: 3 - 5 litres/minute
Flow rate for flushing of bowl
outside and sludge duct during approx, 1 200 l/h.
discharge:

Operating water quality See ‘‘8.7 Demand specification, service water” on page 174.

Weight
Separator without motor: Net weight approx. 1009 kg
Motor: Net weight, approx 181 kg
Complete bowl: Approx. 290 kg

Overhead hoist for 1 000 kp (10 kN) is required. The

separator must be lifted without bowl.
See lifting instructions

The manufacturer reserves the rights to change

specifications without notice

Vibration level Max. 7,1/11,2 mm/sec (new sep/after running-in period)

Note! These are not values to be set on the vibration monitoring

equipment, but limit values for a hand-held vibration
instrument. See ‘‘7 Check points” on page 121

Bowl max. inner diameter 411 mm

Bowl volume 12,8 litres

152
8 Technical References 8.3 Paring disc capacity

8.3 Paring disc capacity

G0493511
P max (overflow)
P min for air effluvent

153
8.4 PX Sealing diagram 8 Technical References

8.4 PX Sealing diagram

Alfa Laval ref. 557272, rev. 0

Reference diagram for feed = 1100 kg/m3

Reference diagram for wet solids = 1251 kg/m3

Separator Bowl speed = 7432 rev/min

Note!
Should the need occur to separate liquids
containing solids of higher densities, first contact
your local Alfa Laval representative for advice.
Maximum permitted operating liquid density =
1000 (kg/m3).

Explanation of the PX SEALING diagram

When the sealing capacity of a separator with a
sliding bowl bottom (SBB) is calculated, the result
is often presented in graphic form. This graph is
called the sealing graph.
As shown by the diagram, the solids density, ρs,
on the Y-axis is plotted as a function of the feed
density, ρf on the X-axis. There are 2 lines on the
graph that intersect at one point in the middle of
the graph. These two lines describe two
mathematical relations regarding the sealing
capacity of the machine.
G0607111
The line starting at the lower left corner of the
graph is the relation A = No Sealing
ρs = ρf i.e. solids density equals feed density. B = Operational Envelope
C = Non Physical
Anything below this line means that the solids
density is less than the feed density which is Ps = Wet solids density
impossible in a separator since we need a higher Pf = Feed density
density of the solids phase in order to obtain a
centrifugal separation or “settling”. Thus, the
lower right triangle can be disregarded as a “non-
physical” - non-operative - area.
Any point above the line, however, is theoretically
possible, from a separation point of view.

154
8 Technical References 8.4 PX Sealing diagram

The machine, which has a hydraulically operated

sliding bowl bottom, can not maintain a good seal
along the circumference of the area where solids
are deposited unless certain other conditions are
fulfilled.
Very much simplified, the line starting in the upper
left corner sloping downwards to the point of
intersection, describes the geometry of the
machine with regard to the hydraulic seal capacity
when the operating liquid density as well as
various gas pressures are taken into account.
The downward sloping line can be described by
the equation:
ρs = const1 - const2 . ρf
i.e. The solids density equals the difference
between a constant and the feed density
multiplied by another constant.
Here, the constants take into account all
geometrical relations such as interface radius
between feed and solids phase, seal inner radius,
seal width etc. The operating liquid and, if
applicable, various gas pressures in the operating
system will also affect the constants.
Thus, the line describes the design parameters
and the critical operating parameters for a
satisfactory seal condition.
Any composition of solids and feed density, (ρs, ρf)
that falls to the right of the sloping line means that
the seal will NOT operate in the desired manner
and we have a state of unwanted self-triggering
(= leakage). It is only within the triangle confined
by the 2 lines that the separator will have an
acceptable sealing function.

155
8.5 Drawings 8 Technical References

8.5 Drawings

8.5.1 Basic size drawing

Alfa Laval ref. 557074, rev. 0

G0583111

A. Tightening torque 20 Nm secured Connection 220 turnable in 90° steps

with counter nut
Connection 201 turnable 360°

All connection to be installed non-loaded and flexible

Maximum horizontal displacement at the in/outlet connections

during operation ±20 mm

Maximum vertical displacement at the cyclone connection

during operation ±10 mm

156
8 Technical References 8.5 Drawings

8.5.2 Separator connections

G0583211

157
8.5 Drawings 8 Technical References

8.5.3 Connections list

Alfa Laval ref. 557477, rev. 0

Connection No. Description Requirements/limits

201 Inlet for product

- Allowed temperature Min. 0 °C, max. 100 °C

- Flow rate 0-25 m3/h

- Pressure 25-400 kPa

220 Outlet for light phase

- Pressure 400-1000 kPa

- Flow rate 0-25 m3/h

222 Outlet for solid phase

- Discharge volume 6 liter

- Discharge interval Max 1 discharge/min

- The outlet after the cyclone should be installed in

such a way that you can not fill the cyclone with
sludge. (Guidance of sludge pump or open outlet)

302 Flushing above the bowl

- Flow rate 0-720 litres/h

304 Flushing in sediment outlet

- Flow rate 0-720 litres/h

375 Inlet for discharges and make-up liquid

- Pressure 150-600 kPa

- Flow rate at open valve 35-50 liter/minutes

- Quality requirements see ‘‘8.7 Demand

specification, service
water” on page 174

158
8 Technical References 8.5 Drawings

Connection No. Description Requirements/limits

405 Inlet for cooling liquid, frame top parts

- Flow rate 3-5 litres/min

406 Outlet for cooling liquid, frame parts

-Free outlet to drain

441 Inlet for liquid seal in paring chamber

- Flow rate 0-1 litres/minutes

462 Drain frame top part lower

- Draining of discharge liquid in connection with

discharge

- Free outlet to drain.

463 Drain frame top part, upper

- Free outlet to drain.

701 Motor for separation

- Max. deviation from nominal frequency ± 5%

710 Solenoid valve for discharge device

Type: 2-way solenoid valve

Voltage (50/60 Hz) 24 V AC 48 V AC 110 V AC

Effect, inrush 45 VA 45 VA 45 VA
Effect, holding 23 VA 23 VA 23 VA
Voltage 24 V DC
Effect, nominal 11,2 W

159
8.5 Drawings 8 Technical References

Connection No. Description Requirements/limits

741 Speed sensor for motor shaft.

Electrical data:

Type: inductive proximity switch, NAMUR type

For technical data see separate document

Connection: see Interconnection Diagram

Supply voltage, nominal: 8 V

The secondary switching device for speed

indicating and alarm functions must be capable of
handling pulses with a duration of 0,5 ms

750 Vibration sensor

Type: vibration velocity transducer

Technical data: see separate document

Signal output at 80 Hz RL ≥1 Mhom: 100mV/mm/s

Frequency range: 10 - 2000 Hz

760 Cover interlocking switch

Type: Double, two-way microswitch

Switch rating capacity with 1 million cycles

12/24 V 48 V 127V 220V

AC (VA) Inductive 75 280 500 550
DC (W) 7 9 13 -

160
8 Technical References 8.5 Drawings

8.5.4 Interface description

Alfa Laval ref. 557067, rev. 0

General
In addition to the Connection List this document
describes limitations and conditions for safe
control, monitoring and reliable operation.
At the end of the document a function graph and
running limitations are to be found.

Definitions
Ready for start means:
• The machine is assembled correctly.
• All connections are installed according to
Connection List, Interconnection Diagram
and Interface Description.
Start means:
• The power to the separator is on.
• The acceleration is supervised to insure that
a certain speed has been reached within a
certain time.See ‘‘8.2 Technical data” on page
151.
The start procedure continues until the full speed
has been reached and a stabilization period has
passed (about 1 minute).
Normal stop means:
Stopping of the machine at any time with or
without feed or safety/backup liquid with brake
applied.
Safety stop means:
The machine must be stopped in the quickest and
safest way due to vibrations or process reasons.

161
8.5 Drawings 8 Technical References

Comply to following conditions:

• The bowl must be kept filled.
• Sludge ejection must not be made.
• The machine must not be restarted before the
reason for the safety stop has been
investigated and action has been taken.
In case of safety condition in the plant, the
machine must be stopped in a way that is
described in EN 418.

Component description and Signal

processing

Electrical connections
Separator motor 701
The separator is equipped with a 3-phase DOL-
(direct on line) motor. The separator can also be
started by a Y/D starter, but then the time in Y-
position must be maximized to 5 seconds.

Discharge valve 710

Available versions: 24, 48 or 110 V AC 50/60 Hz
or 24 V DC.
Before first start and after exchange always check
that the valve coil has correct data. A closed valve
can be manually opened.
Signal Processing
At indication of the absence of a discharge the
operator or the control system must initiate a new
discharge. At indication of the absence of two
consecutive sludge discharges, an alarm must be
given and action must be taken. The control
system shall contain a memory function for
registration of the number of initiated discharges.

162
8 Technical References 8.5 Drawings

Speed sensor 741

Proximity sensor of inductive type according to
DIN 19234 (NAMUR) standard giving four
impulses per revolution of the motor shaft. The
bowl speed is calculated from the gear ratio and
the r.p.m. of the motor shaft.
When supplied with rated voltage the sensor
gives a current signal with a size depending if the
position of the sensor head is near the metal
surface or in front of a groove (non-metal).
Speed signal
During start
The machine must be stopped and an alarm must
be given if the speed has not been reached within
the time specified in Technical Data.

During normal operation:

Normal operation condition is considered to have
been achieved 1 minute after the time specified in
Technical Data.
During normal operation the speed is allowed to
vary within speed limits specified below:
• When the speed exceeds the synchronous
speed more than 5%, the machine must be
stopped and a high speed alarm must be
given.
• When the speed falls to 7% below the
synchronous speed for a period longer than 1
minute, a low speed alarm signal must be
given.

Vibration sensor 750

The vibration sensor is of velocity type. The signal
has to be converted in a special transducer, in
which the signal is compared with preset limit
values.
When the preset limit values are exceeded
appropriate countermeasures have to be
performed. The two levels are warning for
acceptable vibrations and safety stop respectively
in case of extreme unbalance.

163
8.5 Drawings 8 Technical References

A frequency band 15-19 Hz is filtered 3dB with a

NOTCH FILTER. The purpose is to reduce the
effect of resonance in the machine excited by the
paring disc.

Vibration signal
During Start
The vibration signal levels given below in mV or
mm/s are expressed as rms values.
During start (bowl speed range of 0 - 95% of
synchronous speed)
In case of a vibration signal exceeding 600 mV
(corresponding to a vibration level of 6 mm/s) the
machine must be stopped and an alarm should
be given.
During normal operation
Two levels of vibration are considered for this
machine:
1. In case of a signal exceeding 400 mV
(corresponding to a vibration velocity of 4
mm/s) following action must be taken:
a warning alarm shall be given. The machine
shall be stopped manually with a normal stop
sequence and the reason of the vibration
investigated.
2. In case of a signal exceeding 600 mV
(corresponding to a vibration level of 6 mm/s)
following actions must be taken:
immediate Safety automatic stop of the
machine including alarm for extreme
unbalance.

Cover interlocking switch 760

The cover of the separator is equipped with an
interlocking switch. When the cover is closed the
interlocking circuit in the starter control is closed
and the separator could be started.
Signal processing
The circuit is closed when the frame hood of the
separator is closed.
The interlocking switch should be connected so
that starting of the motor is prevented when the
separator hood is not closed.

164
8 Technical References 8.5 Drawings

Function graph and running limitations

E
G0543221

A. Stand still
B. Starting mode
C. Running mode
D. Stop mode
E. Safety stop mode

165
8.5 Drawings 8 Technical References

8.5.5 Foundation
Alfa Laval ref. 557079, rev. 0

G0583011
A. Min. lifting capacity required when doing service: 1000 kg
B. Max. height of largest component incl. lifting tool
C. Horizontal max. deviation 0,4°
E. Floor level
F. Anchor bolt
G. Structural concrete
H. Center of separator bowl
I. 3 holes 3/8” - 11UNC for horizontal adjustment
K. 8 holes φ 20 for anchorage

Recommended free floor space for

unloading when doing service.

No fixed installations within this area.

Vertical force not exceeding 20 kN/foot.

Horizontal force not exceeding 20 kN/foot.

Center of gravity (Complete machine)

166
8 Technical References 8.5 Drawings

8.5.6 Electric motor

Alfa Laval ref. 540472, rev. 4

G0692821
A. 4 holes, Ø18

Manufacturer Not fixed

Standards IEC 72
Size 180L
Poles 4
Degree of protection IP44
Method of cooling R
Specification Totally enclosed fan-
cooled three-phase
induction motor

NOTE
For complete information about motor
variants, please contact your Tetra Pak
representative.

167
8.6 Interconnection diagram 8 Technical References

8.6 Interconnection
diagram
Alfa Laval ref. 552954, rev. 2

G0607011

Wire colour codes Attention:

BK = black All wires to be cut to appropriate length to match respective

BN = brown earth connection terminal. Wires 5,6,8 and loose wire ends
BU = blue at cable 7 to be insulated with appropriate shrinking tubing.
GN-YW = green-yellow Wire ends to be marked with “PARTEX” PA01 (1,2,5,6) and
BK-YW = black-yellow PA02 (8,40,41) (yellow with black marking) after insulation
YW = yellow and fitted with ferrules with insulated collar.
WT = white
RD = red 710. Solenoid valve (Discharge)
SHI. = shield 741. Speed sensor (Motor shaft speed)
SIG. = signal 750. Vibration sensor (Velocity transducer)
TRANS. = transparent 760. Interlocking switch (Frame top part)

168
8 Technical References 8.6 Interconnection diagram

8.6.1 Discharge valve

G0629521
A. Alfa Laval identification number

Technical data

Water pressure: 0-0,7 MPa (0-7 bar)

Water temp.: max 85 °C

Ambient temp.: max 75 °C

Flow factor Kv: 4,3 m3/h

Orifice size: 19 mm

Diaphragm in viton

Cable connection: Pg11 for cable φ 9-φ 11

Enclosure: IP 65 (NEMA 4)

Manufactured acc. to IEC 144

Continuous duty moulded coil class F
Valve may be mounted in any position

169
8.6 Interconnection diagram 8 Technical References

8.6.2 Speed sensor

G0636111
Electrical data: A. Metal free zone
Nominal voltage 8 V DC B. Cable. Marked: PEPPERL+FUCHS
Current consumption: target absent ≥ 3 mA NJ4-12GM-N
target present ≤ 1 mA Colour: Blue
Internal resistance approx. 1 kohm Length: 2 metres
Self inductance 29 µH Copper area: 0,34 mm2
Self capacitance 45 nF C. Test plate
Switching frequency f max. 1,5 kHz D. Proximity switch
Performance according to DIN 19 234 (NAMUR) E. Current (mA9), Distance (mm)
Max. cable resistance 100 ohm Output signals as function of distance
Mechanical data: Example: material mild steel
Ambient temperature 1/ -25 °C to + 100 °C 1/At
ambient temperature above 80°C the
Protection class IP 67 cable must be permanently fastened
2/ According to EN 50 010
Material: sleeve Stainless steel Approval:
cable PVC PTB Nr. Ex-83/2022 X
Nominal swit6ching range, Sn 2/ 4 mm EEx ia IIC and EEx ib IIC resp.
Operational switching distance, Sa 0 - 3,2 mm Temperature class: 45 °C T6, 60 °C T5, 80 °C
T4, T3, T2 and T1
Shock and vibration loading acc. to IEC 68-2-6 and 68-2-27 Certificate: see drawing No 552192
Shock b ≤ 30g, t ≤ 11 ms Manufactured by Pepper+Fuchs, Germany
Vibration f ≤ 55 Hz, a ≤ 1 mm Supplier in sweden: Electrona-Sievert
Industrielektronik AB

170
8 Technical References 8.6 Interconnection diagram

8.6.3 Vibration sensor

G0636311
Mechanical data:
Protection class: (DIN 40050) IP66 A. Direction of measurement
Ambient temperature: -40 °C....+ 100 °C B. Protective hose
Weight: (without cable) Approx. 0,5 kg Material: Steel with PU coating
Material, enclosure: Steinless steel, hermetically sealed Diam.: φ 10 mm
Mounting position: Horizontal (as shown) ±5 ° deviation Glands: PG7
Vibration displacement: Max. ±0,45 mm Colour: Blue/Grey
Measuring parameter: Vibration velocity C. Cable
Working frequencies: Material: Teflon
Normal range: 10 to 2000 Hz Diam.: φ 4 mm
With linearization circuits: 1 to 2000 Hz Leads area: 0,38 mm2
Transverse sensitivity: ≤ 7% D. Signal
Electrical data: E. 0 V-Zero
Measuring principle: Electrodynamic F. Shield
Sensitivity: (f=80Hz, RL≥ 1MΩ) 100 mV/mm/s
Internal impedance: 4 kOhm±5%
Resonant frequency fa: 8Hz±10%
Manufacturer: Carl Schenck AG

171
8.6 Interconnection diagram 8 Technical References

8.6.4 Discharge valve

G0629521
A. Alfa Laval identification number

Technical data

Water pressure: 0-0,7 MPa (0-7 bar)

Water temp.: max 85 °C

Ambient temp.: max 75 °C

Flow factor Kv: 4,3 m3/h

Orifice size: 19 mm

Diaphragm in viton

Cable connection: Pg11 for cable φ 9-φ 11

Enclosure: IP 65 (NEMA 4)

Manufactured acc. to IEC 144

Continuous duty moulded coil class F
Valve may be mounted in any position

172
8 Technical References 8.6 Interconnection diagram

8.6.5 Lock switch

G0636411
Mechanical data:
Protection class: IP67 acc to IEC 529 A. Cable:
Ambient temperature: -25 °C to + 70 °C Colour: Grey
Resistance against: Leads area: 0,75 mm2
Shock: 50 g acc to IEC 68-2-7 Material: PVC
Vibration: 5 g (10-500 Hz) acc to IEC 68-2-7 B. Switching points
Enclosure: C. Contact closed
Material: Zinc D. Contact open
Coating: THROPIC treatment Approvals:
Switch mechanism: Approved for flameproof applications
according to EN 50014/NFC 23-514, EN
Material: Stainless steel 50018/NFC 23-518
Sealing rings: Chloroprene rubber Approval: LCIE n.o 81,6089. See AL
Electrical data: drawing 551338
Switching capacity: 1 miljon cycles
Maximum voltage: 500 AC/DC acc to NCF 20,040 */ Type code:
Switching capacity: Actuator and ring made of stainless steel
Voltage: 12 24 48 127 220 Cable length= 5 metres
AC load in VA: 75 200 280 500 550
DC load in W. 7 7 9 13

173
8.7 Demand specification, service water 8 Technical References

8.7 Demand
specification, service
water
Alfa Laval ref. 553406, rev. 7

Operating water is used in the separator for several different functions: e.g. to operate the discharge
mechanism, to lubricate and cool mechanical seals, etc.
Poor quality of the operating water may with time cause erosion, corrosion and/or operating
problem in the separator and must therefore be treated to meet certain demands.

The following requirements are of fundamental importance

1.1 Turbidity-free water, solids content <0,001% by volume.
Deposits must not be allowed to form in certain areas in the separator.
1.2 Max particle size 50 µm.
2. Total hardness less than 180 mg CaCO3 per litre, which corresponds to 10 °dH or 12,5 °E.
Hard water may with time form deposits in the operating mechanism. The precipitation rate is
accelerated with increased operating temperature and low discharge frequency. These effects
become more severe the harder the water is.
3. Chloride content max 100 ppm NaCl (equivalent to 60 mg Cl/l).
Chloride ions contribute to corrosion on the separator surfaces in contact with the operating
water, including the spindle. Corrosion is a process that is accelerated by increased separating
temperature, low pH, and high chloride ion concentration.
A chloride concentration above 60 mg/l is not recommended.
4. pH>6
Increased acidity (lower pH) increases the risk for corrosion; this is accelerated by increased
temperature and high chloride ion content.

NOTE
Alfa Laval accepts no liability for consequences
arising from unsatisfactorily purified operating
water supplied by the customer.

174
8 Technical References 8.8 Demand specification, compressed air

8.8 Demand
specification,
compressed air
Alfa Laval ref. 553407, rev. 4

The supply of compressed air to separator discharge system, valve actuators, positioners,
instruments etc. must be of such a quality that satisfactory function is ensured for a reasonable
time.
To this end three conditions must be fulfilled:
1. Dirt in the form of solid particles down to a size below 10 micron (0,01 mm) must be removed
from the air. This is preferably done by means of special filters or reducing valves provided with
filters.
2. Oil is always transferred to the compressed air from oil-lubricated compressors and must be
removed to the highest possible degree. It constitutes a serious contamination, which it is
difficult to remove from the instruments. Special filters or oil separators must, therefore, be
provided before the instruments. In small plants, oil-free compressors can be used as an
alternative.
3. In the compressed-air system a condensation takes place at various rates, depending on the
moisture content at the air inlet, the temperature before and after the compressor, partially
lower temperature in any cold zone passed by the pipe (outdoor, cellar etc.) and the like.
The air must thus be dried with regard to the lowest temperature existing after the drying
device, so that condensate in the instruments is avoided. Note that the air will also be cooled
through expansion after passing constrictions and nozzles in the instruments, with
condensation as a result. In view of the above, the following must be observed:
At the inlet to an instrument, the dew point of the compressed air should lie at least 10 °C below
the lowest ambient temperature. This is usually obtained by using an absorption drier of
suitable capacity. If the air contains much water, provide a primary separator before the filter.

Air filters should be placed so as to be easily surveyable and accessible in order to facilitate daily
condition checks, and exchange of the filter cartridge.

NOTE
Alfa Laval accepts no liability for consequences
arising from unsatisfactorily purified
compressed air supplied by the customer.

175
8.9 Identification and safety signs on machine 8 Technical References

8.9 Identification and

safety signs on
machine
Alfa Laval ref. 557099, rev. 0

G0262741
1. Machine plate
Separator type
Manufacturing serial No / Year
Product No

S0061411
Machine top part
Inlet and outlet
Bowl
Machine bottom part
Max. speed (bowl)
Direction of rotation (bowl)
Speed motor shaft
El. current frequency
Recommended motor power
Max. density of feed
Max. density of sediment
Max. density of operating liquid
Process temperature min./max.

176
8 Technical References 8.9 Identification and safety signs on machine

3. Safety label
! WA R N I N G
Text on label:
XXXXXXXXXXXXXXXXX

WARNING XXXX XXXX XXXX

XXXXXXXXXXXX XXX
XXXXXXX XXXXX XX
XXXXX XXXXXXX
XXX XXX X XXX XX XXXX
XXXX XX X X XXXXX XXX
X XXX XXXX XXX XX XX X
XX X XXXXX XX X XXXX
XXX XXX X XXXXXX
XXXXXXXXX. X XXX X XXX. XXX XXX XXX X XXXXX

S00690N1
XXX X XXXX .
XXXXX XXX XXXX XXX

Read the instruction manuals before installation, XXXXX XXXX X XXXX XXX XXXXX X XXXXX XX X
XX. XXX XX XXX XXX XX X.
XXXXXXX/XX,X XX

operation and maintenance. Consider inspection

intervals.
Failure to strictly follow instructions can lead to
fatal injury.
If excessive vibration occurs, stop separator and
keep bowl filled with liquid during rundown.
Out of balance vibration will become worse if bowl
is not full.
Separator must stop rotating before any
dismantling work is started.
4. Name plate

S0063211
5. Power supply frequency

S0063111
6. Arrow

S006882
Indicating direction of rotation of horizontal driving
device.
7. Lifting instructions
S0069111

177
8.9 Identification and safety signs on machine 8 Technical References

178
9 Installation

Contents

9.1 General information 180

9.1.1 Planning of installation 180
9.1.2 Important measurements 180

9.2 Storage and transport of goods 181

9.2.1 Storage 181
9.2.2 Transport 182

9.3 Service space 183

9.3.1 Space for separator 183
9.3.2 Space for transport of bowl 183
9.3.3 Space for gear oil changing 183

9.4 Foundation 184

179
9.1 General information 9 Installation

9.1 General information

9.1.1 Planning of installation

The spaces required for one or more separation
systems can be calculated by consulting the
dimension drawings and instructions for ancillary
equipment, electrical and electronic equipment
and cables equipment.

G0020611
9.1.2 Important measurements
Important measurements are minimum lifting
height for lifting tackle, shortest distance between
e.g. driving motor and wall, free passage for
dismantling and assembly, as well as for
maintenance and operation.

G0020711
Plan your installation with sufficient room for
control and operation, so that instruments are
easily visible, valves and control means within
convenient reach. Pay attention to space for
maintenance work, work benches, space on floor
for machine parts or for a service carriage.

G0020811

180
9 Installation 9.2 Storage and transport of goods

9.2 Storage and transport

of goods

9.2.1 Storage
Specification
Upon arrival to the store, check all components
and keep them:
1. well stored and protected from mechanical
damages,
2. dry and protected from rain and humidity,
3. organized in the store in such a way that the
goods will be easily accessible when
installation is about to take place.
A separator can be delivered in different types of
protection:
• Fixed on a pallet.
The separator must be stored in a storage
room and protected as per paragraph 1 and
2.

G0115711
• In a wooden box which is not water tight.
The separator must be stored as per
paragraph 2.
G0116011

181
9.2 Storage and transport of goods 9 Installation

9.2.2 Transport
Specification
• During the transport of a separator the bowl
must always be taken out of the machine
for separate transport.
1. When lifting a separator it must always be
well slinged.

G0000111
WARNING

Wrong lifting method may be

dangerous to personnel and
cause damage.

• During installation, all inlets and outlets to

separators and accessories must be covered
to be protected from dirt and dust.

G0583411

182
9 Installation 9.3 Service space

9.3 Service space

9.3.1 Space for separator

The separator shall be placed in such a way that
suitable space for maintenance and repair is
obtained.
Specification
• Service space required with the separator
installed.
See ‘‘8.5.5 Foundation” on page 166.
Recommendation
The spanner for the large lock ring should be
given free space to make a complete turn without
touching any of the ancillary equipment
surrounding the separator.

9.3.2 Space for transport of bowl

Specification
• A minimum height is required to lift the bowl
and the bowl parts.
See ‘‘8.5.5 Foundation” on page 166.
Recommendation
When two or more separators are installed, the
lifting height may have to be increased to enable
parts from one separator to be lifted and moved
over an adjoining separator.

9.3.3 Space for gear oil changing

Specification
• The plug for gearbox oil draining must not be
blocked by e.g. floor plates arrangement.
Recommendation
A portable collecting tray should be able to be
placed under the gearbox drain plug for changing
of gear oil.
G0262111

183
9.4 Foundation 9 Installation

9.4 Foundation
Specification
• The separator can either be installed at the
floor level or on a platform. See ‘‘8.5.5
Foundation” on page 166.
• The separator must be installed on a strong
and rigid foundation to reduce the influence of
vibrations from adjacent machinery.
• Mount the separator frame on the foundation
as follows:
• The foundation shall be provided with a
cofferdam.
− Place the separator frame without
cushions in position
− Check that the bolts do not press against
the edges of the holes, otherwise the
resilient mounting of the separator frame
will be impeded.
− If height adjusting washers has been
found necessary fit these washers.
− Check that the separator frame is
horizontal and that all feet rest on the
foundation.
− Lift the separator frame, fit the vibration
dampers, lower and check that the bolts
do not press against the edges of the
holes.
− Lock the vibration dampers with double
nuts. Screw down the nuts till they touch
the cup covers and tighten a further half-
turn. Hold the nuts firmly and secure with
the lock nuts.

184
Reader’s Comment Form
Dear reader,

It is our ambition to produce as useful and instructive manuals as possible. Should you have any
comments (positive or negative) regarding this manual, please note them down and send them to
us. You can do this by copying this page and sending it by fax, or you could mail it, or hand it over
to your local Alfa Laval representative.
Alfa Laval Tumba AB, Separator Manuals, dept. PPDM, SE-147 80 Tumba, Sweden.
Fax: +46 8 530 310 40.

Your name: Company:

Address: City:

Country:

Product: VNPX 710SGD-34GL Book No.: 1270109-02 Rev. 7

Date:

Yes No
Is it easy to find what you are looking for by using the table of contents? ❒ ❒
Are the chapter and section headings clear and adequate? ❒ ❒
Is the information presented in the correct order for your purposes? ❒ ❒
Does the information in the manual cover your needs? ❒ ❒
Is it easy to understand the instructions in the manual? ❒ ❒
Is the terminology sufficiently explained? ❒ ❒
Are the illustrations easy to understand? ❒ ❒
Your comments:

185
186
Order Form
If you wish to order extra copies of this manual, please copy this page and give it to your local
Alfa Laval representative, who will advise you of current prices.
Your local Alfa Laval representative will also be able to help you with information regarding any
other manuals.

Your name: Company:

Address: City:

Country:

Product: VNPX 710SGD-34GL Book No.: 1270109-02 Rev. 7

Quantity: Date:

Comments:

187
188