Operation Notes
A permanent bed of salt at least 150mm thick must be
maintained to ensure that fully saturated brine is produced
and this bed acts as an efficient filter removing dirt or dust
which may have arrived with the water supply or from the
atmosphere. If the permanent salt bed becomes very dirty
indicated by discoloured brine or reduced flow the
installation must be thoroughly cleaned.
The constant head pressure behind the discharge is equal
to the normal level of water in the saturator. Brine should
not be pumped at a rate exceeding the nominal continuous
output of the unit (see table) as tracking may occur
through the salt bed, allowing partially saturated brine to
pass. If there is a need for large volumes of brine to be
available more quickly than the normal output of the
saturator provides, a separate collection tank or break
tank should be employed. This will allow the saturator to
operate smoothly and at maximum efficiency.
Deliveries
Road deliveries of PDV salt by air discharge through 4NB
pipe are most common. The pipework is normally NT3 or
NT4 grade aluminium and as corrosion can take place
under wet conditions the pipes should be examined
regularly. Plastic pipes are not recommended in view of
potential static electricity build up.
Your Forbes saturator is normally provided with a fill pipe
terminating, complete with tanker coupling, against its
vertical wall to within 1.3 metres of ground level. If the
standard fill pipe is not required, care should be taken in
the design of the fill line and reference should be made to
the salt suppliers recommendations regarding radius of
bends and other considerations.
In determining the correct specification for your salt
saturator it will be important to consider the bulk delivery
quantities available from your supplier commonly 7, 10,
14, 18, 22 and 24 tonnes.
Considerations When Specifying
Salt usage, including predicted brine draw-off
requirements
Available bulk delivery quanities from salt suppliers
Location of saturator indoors or outdoors
Vehicle access and salt fill line requirements
Orientation of all nozzles Type of dust control
PRODUCT RANGE
Thermoplastics Tanks
Tanks, Vessels & Fabrications
GRP/THERMOPLASTICS DUAL LAMINATES
Salt
Saturators
Tanks, Vessels & Silos
GRP COMPOSITES
MINIBULK Chemical Storage
Systems
Sectional Tanks
Silos
FOR SOLIDS & LIQUIDS
Salt Saturators
Pressure and Vacuum Vessels
Fume and Odour Scrubbing
Systems
Vent Scrubbers
CO2 Degassers
Stripping Towers
Carbon Adsorption Units
Bio Treatment Systems
Ancillary Steelwork
Skid Mounted Modules
Turnkey Projects
For further information visit our
website at: www.forbesgroup.co.uk
Each Forbes Salt Saturator is provided as standard with a
detailed manual including offloading and general handling
instructions, installation and commissioning instructions
and assembly drawings.
All tanks and salt saturators need a firm, flat and level
concrete base.
Useful Data
The density of PVD salt (either in air or submerged)
FORBES
Denver Downham Market Norfolk PE38 0DR UK
Tel +44 (0)1366 389 600 Fax +44 (0)1366 385 274
Email sales@forbesgroup.co.uk
Website: www.forbesgroup.co.uk
is 1,200 kg per cubic metre 75 lbs per cubic foot
The specific gravity of saturated brine is 1.2
Saturated brine at 20 degrees centigrade contains
26.45% salt by weight.
BS EN ISO 9001 FM 24188
ANGLIA DESIGN AND MARKETING 01 366 384 942 030802
Important
MODEL
NUMBER
2.4 Series
Salt Saturators
A CONTINUOUS SUPPLY OF SATURATED BRINE
3.0 Series
Brine is necessary for many applications in the food and chemical industries
and for water treatment. Forbes salt saturators provide a constant
controllable supply of saturated brine solution. They are fabricated on
advanced, largely automatic, machinery using GRP materials fully approved
to the stringent requirements of the Water Research Council (Wrc).
The saturator vessel contains layers of graded gravel on which rests a bed of salt
covered by a constant head of water. The water dissolves the salt and, filtering
through the gravel, emerges as clean, saturated brine in an automatic process
needing only a water supply and refilling with salt from time to time.
The saturator accepts bulk deliveries of PDV salt and avoids the need for separate
storage of dry salt. If bagged deliveries are required for smaller capacity
saturators, cones/hoppers and grids can be supplied.
3.5 Series
Our standard range of salt saturators has been designed for an optimal operating
water head pressure while allowing for the normal increase in the water level after
a full recharge of salt. Custom-designed low head models are available to help
customers with site limitations, but the implications for managing such units should
be discussed with our technical sales staff.
The extensive range of sizes listed is further complimented by a new small range
fabricated from natural or black pigmented polypropylene materials with capacities
of 100, 300, 550 and 1800 kilogrammes. These small units are designed for
manual recharge with 25kg bags of PDV salt.
All units are built from corrosion free materials and can be sited outdoors where
most convenient for delivery vehicles. Maintenance is limited to checking the
operation of the water level control system, visual monitoring of the salt stock level
through a translucent strip (GRP and natural PP models) and very occasional
thorough cleaning. All steel parts, including nuts, bolt and washers are protected
from corrosion by hot dip galvanising. The water inlet control float valve is housed
within a protective chamber to avoid obstruction by salt.
Standard features include :
Salt inlet flange with aluminium fill pipe and
tanker connection Brine outlet with internal
collector pipe system Water inlet with ball
float valve Air vent with weather cowl
Visual salt level indication Flange for overflow Lifting lugs Two layer gravel bed
Salt Dust Control
Our salt saturators are supplied as standard with a simple cowled vent. With an
outdoor installation, the small amount of dust expelled during deliveries may
present no hazard or nuisance. Indoors or in sensitive areas dust control options
should be considered.
Options include :
Dust control Level alarm Overflow
pipework Access steelwork Installation
For outdoor installations only, a salt dust arrestor pot can be used. It will not
usually trap all dust from a high volume air discharge system but may be
acceptable if a moderate escape of dust can be tolerated.
DOME
A pair of sock or bag filters fitted to a branched vent pipe should normally control
the problem. The socks must be kept dry at all times, cleaned of salt and stored in
a dry place between deliveries.
4.0 Series
Side access manway Top access manway
MAXIMUM
MAXIMUM NOMINAL
SALT
SALT
BEFORE
HEIGHT
RECHARGE
CAPACITY
RECHARGE
A(mm)
7/5
2100
8/6
2400
10/8
10
3000
12/10
12
10
3600
15/12
15
12
4500
18/15
18
15
5400
20/17
20
17
6000
10/7
10
2000
17/14
17
14
3250
21/18
21
18
4000
23/18
23
18
4250
25/20
25
20
4600
27/20
27
20
4850
30/20
30
20
10
5200
38/28
38
28
10
6600
40/28
40
28
12
6750
30/20
30
20
10
4200
40/30
40
30
10
5050
50/40
50
40
10
5900
60/50
60
50
10
6800
70/60
70
60
10
7650
80/70
80
70
10
8500
90/80
90
80
10
9400
100/90
100
90
10
10250
40/30
40
30
10
3900
50/40
50
40
10
4550
60/50
60
50
10
5200
70/60
70
60
10
5800
80/70
80
70
10
6450
90/80
90
80
10
7050
100/90
100
90
10
7700
110/100
110
100
10
8300
120/110
120
110
10
8950
130/120
130
120
10
9600
140/130
140
130
10
10200
ALL ABOVE IN TONNES
A mechanical filter unit can provide a high level of protection.
Nominal internal
diameter (mm)
Nominal dome
height (mm)
12-20mm gravel
(tonnes)
3-6mm gravel
(tonnes)
Continuous
output (litres/hr)
Short term high
demand (litres/hr)
PERMANENT SALT BED
FINE GRAVEL
150
150
COARSE GRAVEL
75
2.4
SERIES
3.0
SERIES
3.5
SERIES
4.0
SERIES
2400
3050
3500
4100
600
600
700
800
0.6
1.0
1.3
1.8
1.2
2.0
2.6
3.6
2400
3700
4900
6800
3500
5500
7200
9500
