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187 views28 pagesM - 49 M.G.P.S
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koskotzmannCopyright
© © All Rights Reserved
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/ 28
ISKMATI SPIRIT
i CorrsToch Korea td.
‘Salat SIAEETEIOL
ANTI-FOULING SYSTEM
185,000 DWT CLASS CRUDE OIL CARRIER
-- SAMHO --
( HULL NO. $148 / 149 )
CorrsTech Korea Ltd.
#34-2, Samjeong-dong, Ojeong-gu, Bucheon-si, Gyeonggi-do, Korea
Tel : +82-32-683-3204 Fax : +82-32-683-3233 5.
APPENDIX DRAWING SCHEDULE
INDEX
GENERAL DESCRIPTION
14. Introduction
1.2. Anti-Fouling System
MATERIALS AND EQUIPMENT
2.1 Power Contro) Unit
2.2 Electric Cable
2.3. Junction box
2.4 Alloy Anodes
INSTALLATION
3.1 Power Control Unit
3.2 Connecting Cables / Junction Boxes
ery
3.3 Anode / Cofferdam / Flange
COMMISSIONING 10
MAINTENANCE all
12 1
GENERAL DESCRIPTION
1.1. INTRODUCTION
Marine organisms enter the sea water circulation systems usually aS \arvee and
spats, and settle and fully grow in the ideal ship environment - namely lower water
flow rates, adequate supplies of nutrients, oxygen and higher temperatures.
If not combated, these marine fouling can result in partial or complete blockage of
pipeworks and restrict or completely prevent of use of the water systems.
Traditionally chlorination has been used to remove marine growth in sea water
systems, by the addition of chlotine/hypochlorite or by electrochlorination. However
these methods have not been suitable economic alternatives of providing
antifouling and are always afraid to increase corrosion.
CorrsTech Anti-Fouling System based on electrolytic cooper and aluminium or iron
dosage now provides a more reliable, economical and technically and
environmentally acceptable alternative,
1.2 ANTIF-FOULING SYSTEM
The system consists essentially of a power control unit, anti-fouling anode(s) and
anti-corrosion anode(s). The power control unit is usually installed in a place where it
can be easily accessed by ship staff, in ship's engine room and the anodes in each
sea chest of injection strainer or any
fermediate suitable reaction tank. The sea
water system downstream from the anodes will receive protection. A general
arrangement of the complete system is shown in Drawing No. AM 1164
Anode functions are as follows :
Cu - Anode Antifouling
Al Anode : Reduction in Corrosion of Steel Surfaces
Fe- Anode : Reduction in Corrasian of Non-Ferrous Surfaces
as Anti-Fouling and Corrosion Mitigation is achieved by dissolving anodes by the
application of a controlled D.C. current to the anodes in the sea water circulation
system.
D.C. current applied to the copper anode releases a controlled quantity cf copper ions
into the sea water circuits to create an environment in which primary forms of marine
life cannot settle and develope. The actual concentration of copper ions is extremely
small and measured in micrograms per litre of sea water.
Current applied to the aluminium anode releases an aluminium hydroxide ‘tioc’ of
colloidal properties, The aluminium oxidetion products reduce corrosion rates in the
sea water system of ferrous components by modifying the ferrous oxides formed and
boy film deposition. Similarly, iron anodes are utilised for reducing corrosion rates of
non-ferrous components. 2.
MATERIALS AND EQUIPMENT
2.1 Power Control Unit
The Power Control Unit is of modular construction with A.C. input and D.C. output
via individual modules as illustrated by Drawing No. AM 1158,
Each unit is made up of 1 - 4 separate modules, which are interchangeable. The
module has two separate positive outputs each of capacity 2 or 3 Amps (4 or 6
Amps total).
One Module 2 Positive Outputs 2 Way Unit
Two Modules 4 Positive Outputs 4. Way Unit
Three Modules —_—_6 Positive Outputs 6 Way Unit
Four Modules 8 Positive Outputs 8 Way Unit
A common negative exists for all modules.
A separate earthing connection should be provided on sea chests or injection
straines cover where the anodes are installed; if not already provided on the anode
coffetdam_unit.
OPTION : Facility to operate at reduced | increased output for variable low / high
flow rates
22 Electric Cable
(2) input
AC. input cable and fittings - terminations, glands, grommets and shrouds, etc., are
usually of shipyard supply. The A.C. supply cable size is rated according to the
maximum D.C. output of the power unit. Usually, a very small conductor size is
adequate but for physical and electrical reasons, it is preferable to use a larger cable
conductor size than the nominal cucrent capacity needed. Cable insulation, armoring
and sleeving is dictated by ship classification requirements. Input supply may de
440/380V 3 phase 60Hz; 220)240V single phase or 110V single phase. A 2.5 Amp input fuse is provided.
Input cable size of minimum cross-section 25 sq. mm per conductor is
recommended.
e.g. 3 x 2.5 sq. mm PVC/PVC/SWA/PVC
NOTE : Non Armoured cable can be used on runs in trays or conduits
(&) D.c. Output
The D.C. output from each module is connected to the anodes (positive output) and
sea chests or injection strainer covers respectively (negative output) via an
intermediate junction box.
Single core x 5.5 sq, mm cable is supplied for D.C. distribution to the anodes from
the junction box without any significant voltage drop.
Systems normally utilize 3 core cable per module output; two positive to Cu anode
and Al anode respectively and one negative to the sea chest (see Drawing No, AM
1164), between the power unit and the junction box. for this section of cabling an
armoured cable_is_preferable_(e.g._ EPR/CSP/GSW/CSP);—unless—cable—tray—or
conduit is used for distribution where cable with insulation and sleeving alone can
be adequate. This can be EPR/CSP or XLPEJPVC. Cable voltage rating is not
significant since units operate well below 15 volts D.C., the maximum output of the
power unit. Most cables have voltage ratings above 200 volts.
(c) Earthing
An insulated earthing cable minimum 1 x 5.5 mm? should be connected from the
power earth connection on the power unit housing to a suitable external earth
point.
2.3. Junction Box
CorrsTech supply standard junction boxes rated to IP65, (typical construction is shown in Drawing No. AM 1178), with input 3 x 5.5 mm? and 3 separate outputs to
Cu anode, Al anode and: sea chest or injection strainer respectively.
An intermediate junction box facilitates separation of anodes from the supply, thus
avoiding interference with the remainder of the installation - during inspection or
anode replacement periods and is necessary where anode assemblies are provided
as a separate unit complete with pre-connected cable.
2.4 Alloy Anodes
A typical anode arrangement, complete with cofferdam and mounting flange is
shown in Drawing No. AM 1174.
The_anode assembly can be separated from the cotferdamsflange;the latter_being
welded in-situ in the sea chest or injection strainer cover. The same type of
assembly construction is used for Cu, Al and Fe anodes.
The constituent components of the anode assembly construction are detailed in
Drawing No. AM 1174,
Anode sizes are designed according to a seawater flow rate and a dry docking or
anode replacement period,
Variations in Diameter, Length or Shape of anode can be provided depending on
(a) the space available to install anode assemblies,
(b) the period of use prior to dissolution and replacement. (For sea chest locations,
the replacement period is generally the dry docking interval.) 3.
INSTALLATION INSTRUCTIONS
3.1 Power Control Unit
The control panel should be located. as near as possible to A.C. power supply and
the anode locations (to minimise the D.C, cable length and voltage drop.)
The control panel location should meet the following requirements:
(a) Max. ambient temperature of $0 deg. C. (Unit rated to 55 deg. C.)
{b)-Adequate-space_around_unit to assist ventilation
(c) Approx. head height max to facilitate reading and output adjustment or servicing
(a) be easily accessible
(e) be in a safe non-hazardous environment
(f) bulkhead mounted andjor secured to suitable base
3.2. Connecting Cables / Junction Boxes
Input A.C, cable connection points and earthing cable connections are clearly marked
in the power control unit. See Drawing No. AM 1062.
Similarly positive output terminals on each module are evident with a common
negative cable connection, Cable sizing and specification for A.C. input and D.C.
output are described in Section 2.1.2.
The D.C. supply cable to the anodes should be connected to the intermediate
junction box.
A junction box is provided with cable glands for D.C. input and anode | earthing
output connections, see Drawing No. AM 1164.
‘Anode cables and negalive return should be connected to the D.C. supply in the
junction box. 3.3. Anode | Cotferdam | Flange
Anodes should be installed in the position specifically shown or advised for each
vessel.
The anodes are installed in the selected compartments, namely sea chests, or
injection strainers.
(a) The agreed positions for the apertures for the cofferdam entry points should be
marked and burncut out; taking precautions to protect surrounding
equipment with heat resistant blankets etc. A stand-by fire extinguisher should
be provided.
(b) The mating flange to receive the anode and cofferdam flange should be welded
in position - welding on both inside and outside joints.
(c) A 6 mm % 20 mm hexagon screw can be welded onto the mating flange to
provide a negative connection point as shown in Drawing No. AM 1170 or
welded on any other location directly in metallic contact with the sea chest to
obtain a zero resistance connection (if not already provided).
(a) All weld scale should be removed and any damaged paintwork reinstated,
(e) Carefully lift the anode | cofferdam | flange assembly by means of the eye boits
provided and lower the anode onto the sea chest or strainer mating flange,
making sure that the rubber gasket is in position. Evenly tighten down the anode
flange bolts.
(THE PROCESS IS REPEATED FOR ALL ANODES)
() Make the negative cable connection onto the welded flange. After making
this connection, the stud and nut assembly should be completely covered with
light coating of corrosion protection grease.
(g) Secure anode cables and negative single cable together and take back for connection in the junction box.
NOTE : Painting colour of cofferdam flange
Blue : Cu Anode
White : Al Anode
Black - Fe Anode
{h) When vessel is afloat, carry out leakage tests by checking for ingress of water
into the cofferdam. i
4. COMMISSIONING
(ONLY TO BE CARRIED OUT WHEN THE VESSEL IS AFLOAT)
Check all cable connections at power control unit, junction boxes and anodes.
Identify each positive output and releyant anode and ensure that all anode output
adjustment knobs are in the zero position.
Switch on AC. supply and then the panel on/off switch. Adjust output to the
recommended current values on each anode.
Anode Current
The digital readout display for each anode is indicated in 0.01 amp steps trom 0.0 to
2.0 or 3.0 amps. The current show is the actual current supplied from the module
In cases where the anode resistance is high (worn anodes or vessel in fresh water)
the indicated current may be less than the set current,
Alarms
The following-abnormal-conditions of anodes are indicated by illumination of red alarm
LED on the relevant anode module :
- Anode life span is completed or anode is consumed
No output
‘And also when power fails the power fail alarm relay attached in the panel would
operate.
Alarms are non latching and will clear when the alarm condition has ceased to exist
10 yO
MAINTENANCE
The maintenance requirement is minimal. The system operates at constant current
output and does not therefore require adjustment.
A weekly recording of current output on each anode is recommended. This provides a
record of the system’s operation, an. indication of any changes in tunction, and a
Feminder when anode replacements are scheduled.
A complete loss of current on any anode should be investigated by checking all cabte
connections, power panel fuse of by interchanging modules,
Anode Replacement
Anode rods can be replaced during vessel's drydocking or with closing the sea water
valves for strainers in where anodes are installed (See Orawing No. AM 1174)
{a) Turn the current adjustment knobs on the modules to the zero position and switeh
off the panel onjoff switch before vessss js dry docked or strainer valves are
closed.
{b) Take off the grand shroud (tem 18) and unstrew the cable gland (tem 21} fully.
(c) Open the cotferdam lid (item 2) by turning anti-clockwise and disconnect the
anode cable from the anode stud bolt (item 19) by unscrewing M6 hex. head
screw (Item 22}
{dl} Unscrew the bolt and nut (Item 9), remove the washer (!tem 8) from the cofferdam
flange, carefully lift the anodejcotferdam assembly and move to a suitable piace
for anode replacement work.
Ce) Unscrew the Jock nuts (Item 11) and fuit nut (item 12), remove the washers (tem
2, 14 and 16) and separate the anode (!lem 6) and the stud bolt (Item 19) from
the cofferdam (tet 1) and remove the insulating sleeve (jtem 15} inserted into the
bottom hole of cofferdam.
NW he)
(f) Remove all burrs on the -bottom surface of cofferdam which comes in contact with
the upper neoprene gasket (item 4) and file the bottom surface with a fine flat file,
if required, to form a even surface and clean all traces of cust and dust from the
cofferdam bottom.
(g) Insert the anode stud (Item 19) and insulating sleeve (Item 15) of the new anode
into the bottom hole of cofferdam.
(h) Put the insulating washer (Item 14) with large inside diameter on the anode stud
first, the insulating washer (Item 13) with small inside diameter secondly and the
galvanized steel washer (Item 16) thirdly, to secure the insulation between the
anode stud and the cofferdam.
()) Screw the tull_out (tem 12)-and-lock nuts (item 11) tightly to-secure-watertight seal —
of the anode | cofferdam assembly.
() Carefully lift the anode | cofferdam assembly and lower the anode onto the
mounting boss (Item 10), making sure that the neoprene gasket (tem 7) is
in position.
() Put the washer (Item 8) on the bolt (Item 9) and evenly tighten the bolt and nut
(item 9).
()) Reconnect the anode cable to the anode stud (Item 19), leave a slack of approx. 1
ft cable length inside the cofferdam body and screw the cotferdam lid (Item 2)
back onto the cofferdam tightly.
(m) Tighten the cable gland (Item 21) and put the gland shroud (\tem 18) on the cable
gland.
(n) Switch on the panel on/off switch when the anodes are immersed in the sea wat
and set the output to the recommended current values on each anode by turing
the current adjustment knobs clockwise. APPENDIX
1. AM 1164
2. AM 1158
3. AM 1062
4. AM 1170
5. AM 1174
6 AM 1178
7. AM 1140
DRAWING SCHEDULE
General Arrangement
Controller Power Unit Assembly
Control Panel Input Cable Termination Dtails
Anode Flange Arrangement in Sea Chest
Anode Assembly
Junction Box Detail
Spare Part
13 is
Blucheon-si Gyeonggi-doKorea
, CorrsTech Korea Ltd. om +#34-2.Samjeong-dong Ojeong-gu
BO esen SAaeI01 ¥ Neg Tel:+82-32-683-3204
Fax:482-92-683-3233
E-mailestkorea@corrstech.co ke
i "$0 font lor Camas Petocion 8 WEP'S
Hull No, ; 148/149
CT No + 31.036
SAMHO HEAVY INDUSTRIES CO., LTD.
1700, YONGDANG-RI, SAMHO-MYUN, YOUNGAM-GUN,CHOLLANAM, KOREA
-PROJECT-
To-provide an automatically controlled Antifouling and Corrosion Mitigation System
for the sea water system employing specially formulated Copper and Aluminium
alloy anodes.
-DESIGN CRITERIA~
1. No of sea inlets : 2EA
2. Flow rate of water: 1,600 Hr per sea iniet,
3. Design life span: _5 Years (Working : 2.5 years, Stand By : 2.5 yeras)
-SCOPE OF SUPPLY-
Item 1. : One electronic automatic controller power unit having a maximum DC rated
output of 12 Amps, The unit supplies a constant current and is distributed to
4 anodes outputs which can be individually adjusted to suit operating
conditions,
Power supply : AC 220V, 1Ph, 60Hz.
Stem 2: Two copper anodes to prevent marine fouling supplied complete with
cofferdam comprising flange and hull penetration unit, Additionally two
copper anodes without cofferdam box are supplied for stand-by.
(One in each strainer 9125 x 765L -» 84 Kg/Pc ).
4 Calculation : 2 PPB x 8,760 Hrs | Yr x 1,600m‘JHr x 2.5 Years
* 10° Kgjm* x (1+20% Erosion)
tem 3. : Two aluminium alloy anodes to mitigate corrosion supplied complete
with cofferdam comprising flange and hull penetration unit. Additionally two
aluminium alloyed anodes without cofferdam box are supplied for stand-by.
(One in each strainer 125 x 765L -> 25Kg/Pc ) CorrsTech Korea Lid.
sien ASSCIO
item 4 : Two junction boxes are provided for location close to the Strainer to facil
easy connection to the anodes.
Item 5 : Three spare input fuses.
Item 6 : One set of alarm contact to be normal close type for power failure.
- SERVICES -
Provis
n-of fayout drawings, together with- written installation instructions are included
in the contract price.
- GUARANTEE -
The equipment will be guaranteed against defective component design,
workmanship and materials for a period of 13 months after the ship is delivered to
the-owner. This guarantee is based-on- the system being-installed-according-to
CorrsTech Korea's installation procedures and to the satisfaction of our engineer.
- NOTE -
CorrsTech Korea Limited reserve the right to incorporate improvements in
their system and component design in the period between the submission of
this quotation and the subsequent placing of an order.
The system would be supplied complete but interconnecting cables and cable
trays etc would be of shipyard supply. COMTROWER POWER UNT
AC NPUT 2200 1 PH 60H
> POWER FALURE ALAR
(YARD SUPPLY)
INCTION BOX SLUNCTION BOX
(WeKER SUPPLY) S] waer susP.r)
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(weet SUPALY) (nee SuPeLY)
EARTH BLE EARTH CABLE
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GE CorrsTech Korea Ltd.
ARRANGEMENT
STRANER 1 SIRANES 2 SMM HULL NO. $148/149
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