NlAi~MPRESS leep

IMPRESSED Cl1{~RENT SyC'!po::::"u.s:::::::a

·to
Azienda Chimica Genovese s"r.l. ·i'~s::::~~
Via F. Vezzani, 18
16159 Genova
Italy
 Azienda
Chi mica
Genovese s.r.l.

MARIMPRESS
IMPRESSED CURRENT CATHODIC PROTECTION SYS XEM

SHIPOWNER: OMC
SHIPYARD: GUANGZHOU WENCHONG SHIPY~

HULL N.: GWS317

ICCP300A

OPERATION & INST-ALLAn

MANUAL ON

tO
Azienda Chimica Genovese s
Via F. Vezzani, 18 .r.1·
16159 Genova
Italy

Tel. + 39 010 461371

Fax. + 39 010 7401224 I 128 9
E-mail: info@acgmarine.com
Website: http://www.acgrnar1·
ne.com
Chapter 1 INTRODUCTION
1.1 Main Components
1.2 Electric Cabinet
1.3 Anode
1.4 Reference Cell
1.5 Dielectric Shield

Chapter2 INSTALLATION
2.1 Electric Cabinet
2.2 Anodes
2.3 Dielectric Shield
2.4 Reference Cell
2.5 Sacrificial anodes
2.6 Slip ring
2. 7 Rudder stock grounding

Chapter3 OPERATION
3.1 Preliminary check
3.2 Start-up
3.3 Correct Operation Test
3.4 Operating Data
3.5 Manual Operation

Chapter4 MAINTENANCE
4.1 · Preventative Maintenance
4.2 Overhaul Schedule

ChapterS FAULT FINDING

Chapter6 FUNDAMENTAL PRINCIPLES OF CORROSION

Chapter 7 THEORY OF CATHODIC PROTECTION

ChapterS LIST OF DRAWINGS

Marirnpress ICCP 300A - Page 1

 CHAPTERJ
INTRODUCTION

1.1 Main Components

Marimpress impressed current cathodic protection (ICCP) system consists primarily of:
1 electric cabinet
2 titanium anodes 150A with cofferdams
2 reference cells with cofferdams
2 sets filler for dielectric shields around anodes
1 braided copper cable
1 spare parts

1.2 Electric cabinet

The electric cabinet consists of a drip-proof cabinet. It's principle components are:

transformers
semi-controlled bridge (SCR)
inductor
automatic card with digital display
safety fuses
cooling fan

Open the front of the cabinet to gain access to the internal components. The electric control cabinet has
two main functions:

a) to transfonn the on-board power supply to direct current which is transmitted to and emitted by
the anodes in order to protect the hU:il. · · ·

b) to compare the potential on the hull, measured by the reference cells, with the predetermined
OFFSET value. The OFFSET value is normally +200 to +220mVfor steel hulls. When the
hull's potential rises above +220mV the electric cabinet causes the a!!odes to output a
compensating current proportional to the difference between the measured potential and the
OFFSET value.

Marirnpress ICCP 300A - Page 2

1.3 Anode

The anode consists of an activated titanium plate encapsulated in a pvc base which is designed to be
securely recess mounted in its cofferdam using the boltholes around its perimeter. The anode has a
positive terminal for connection to the electric cabinet.
The anodes function is to output a compensating electric current in order to maintain the hull's
potential constant. Titanium is essentially an inert metal and as such is not consumed. By using a high
2
anodic current density (Nm ) a large area of steel can be protected using a small amount of titanium.

1.4 Reference Cell

The sensory part consists of hyper-pure zinc which is particularly suitable for measuring the potential
of the hull. As with the anode it is encapsulated in a pvc base designed to be securely recess mounted
in its cofferdam.
The function of the reference cell is to continuously measure the potential on the hull. The zinc is
isolated from the hull and as such will last indefinitely.

1.5 Dielectric Shield

The dielectric shield, once mixed should be applied ONLY around the anodes.
The function of the dielectric shield is to ensure that the current output from the anodes doesn't short
near the anodes and reaches the furthermost parts of the hull.

Marimpress ICCP 300A - Page 3

 Chapter 2
INSTALLATION
2.1 Electric Cabinet (Drw. 0000/369/1 Mod.O)

The electric cabinet is installed in the engine room (drw.P-D-2333 mod.Ol).

Choose a position where it will be easily accesable for eventuale maintenance and where the
instruments can be read easily. The cabinet should be shielded from direct water spray and drips. The
air temperature around the cabinet should not exceed 50°C. Fix the cabinet to the floor using 4 M16
bolts. Weld an M24 earthing stud to the wall approximately 0.3m below the cabinet. Weld 2 M8 studs
to the wall near the cabinet for the earthing of the cabinet and the earthing of the reference cell (RIF+).
Make the following connections (Dwg.2374/518/1 mod.01):
cabinet (F7) to anode 1 see table on dwg.2374/518/1 mod.01
cabinet (F8) to anode 2 see table on dwg.2374/518/1 mod.01
2
cabinet (-VE) to M24 stud**: 1 x 95 mm cable
2
cabinet (1 terminal) to reference cell 2 x 2.5 mm cable
this cable must be shielded
2
cabinet (2 terminal) to reference cell 2 x 2.5 mm cable
this cable must be shielded
2
cabinet (C terminal) to earth 1 x 4mm cable
2
cabinet to earth 1 x 10 mm cable
2
input to cabinet 3x440V, 60Hz 3 x 2.5 mm cable
2
terminals -c"& "NC" to remote alarm 2x 1 mm cable

** the hull ground connection must be tight. This ground connection should be covered with grease to
prevent corrosion

2.2 Anode (Drw.P-C-2320 Mod.06)

The 2 anodes are installed in the engin~ room as indicated on GENERAL ARRANGEMENT Dwg P-
D-2333 mod.01).
There must be a mjnjmun djstance of 2.5 m from the disc anode's centre to the other bull
penetrations.
In the indicated positions make 2 holes 521mm, 1 port and 1 starboard, in the hulL
Remove the anode from the cofferdam, place the cofferdam in the hole and weld securely according to
relevent class regulation.

2.3 Dielectric Shield ( drw.P-C-2461/E mod.06)

The dielectric shield is to be applied ONLY around the anodes. It comes in 2 parts:
1. Gray Base
2. Curing Agent
The total dielectric shield requires 40 litres/each anode ie.
20 liters of Gray Base
20 liters of Curing Agent
a) Before mounting the anode in the cofferdam sand-blast (SA 2.5) an area of Radius (R) 2m
around the anode cofferdam.
b) Mount the anode in the cofferdam making sure to include the rubber seal. Fix securely using

Marimpress ICCP 300A - Page 4

the mounting bolts. The anode should be protected from being painted by covering it. Do NO.I attach
anything to the anode surface.
c) Mix a quantity of filler in the ratio of one part base and one part curing agent until an even
colour is achieved. The curing time is dependent on temperature and the filler must be applied
without delay after mixing is finished. Apply to the sand-blasted surface area using a spatula or
broad bladed knife.
The thickness near the cofferdam (A) is 4mm and should taper down to 1rnm (B) at 2m from
the cofferdam.
It is very important that the required thickness is achieved and if necessary the filler can be
applied in two coats. In this case the second coat must be applied within 24hrs of application of
the first coat - wash the first coat With freshwater, scrub well, and dry before appling the
second coat.
d) Apply the filler right up to the PVC anode holder, and fill the boltholes with filler. Do NOI
allow the filler to come into contact with the titanium anode.
e) Last coat (antifouling) of ship's paint is also to be applied over the dielectric shield. Do NOI
allow the paint to come into contact with the titanium anode.

2.4 Reference Cell (Drw.P-C-2442 Mod.07)

The 2 reference cells are installed in the engine room, one port and one starboard (drw.P-D-2333
mod.01 ). The reference electrodes must be placed minirnun 5 meters away from different metals than
steel hull. In the indicated positions make 2 holes 220mm, 1 port and 1 starboard, in the hull.
Remove the cell from the cofferdam, place the cofferdam in the hole and weld securely
according to relevent class regulation.
Secure the cell and its seal to the cofferdam using the M8 hex bolts. Fill the boltholes with the
supplied filler. Use tape and plastic sheeting to cover the reference cell so as to protect it from paint
splashes.

2.5 Sacrificial Anodes

Sacrificial Zinc anodes should be installed inside the seachests, in the bow thr11ster tunnel and in any
. other submerged recessed area.

2.6 Slip Ring

The slip ring is a ring of silver copper, divided in 2 halves, of 5 mm width, 40 mm height and diameter·
according to the propeller shaft. It is, usually, composed of 3 brushes and 2 brush holders which must
be fastened by welding or bolting to the ship. To ensure a low resistance path between the shaf and the
hull, it can be used a short eletric cable fitted between the brush holder and a bolt welded to the hull.
The efficiency of the grounding device can be cheked measuring the potential difference between the
propeller shaft and hull (the positive pin must be pressed to the rotating propeller and the negative pin
to the ground). As an option a monitor and separate brush holder can be installed to enable constant
remote monitoring of the propellers potential (drw. P-C-8725 mod.O&P-C-8727 mod.O).
Contact A. C. G. when you have to change brushes. Brushes are consumable parts and imitated
brushes result in damages on slip ring.

2.7 Rudder Stock Grounding(Dwg P-C-2492 Mod.02 & P-D-2333 mod.O)

Part of the current from the anodes of a cathodic protection will also go to the rudder and from here it
returns to the rectifier via the rudder bearing. To prevent corrosion due to passage of this current, the
rudder stock must be connected to the hull using the flexible cable copper strap.

Marimpress ICCP 300A - Page 5

 Chapter3
OPERATION

The commissioning of the ICCP system should be carried out by a suitably qualified person given that
the correct functioning of the equipment is dependent on correct installation, polarity, etc.

3.1 Preliminary Check

Use a high impedance tester (20.000 ohms!V).
These checks must be done inside the cofferdams or at the terminal blocks inside the control panel.
a) Check the voltage anode; the anode is positive (+), the hull is negative (-):
a.l An unenergized titanium anode develops a voltage versus the steel hull in a range from
0.8 to 2.0 Vdc.
a.2 If this voltage is 0, it indicates or an opened circuit wire or a short circuit.
a.3 If the voltage is in the range 0.2 to 0.5 Volt, it means that a copper wire is immersed in
seawater.
b) Check the reference cell potential; the reference cell is negative (-), the hull is positive (+):
b.l An unprotected hull develops a potential over 300 mV (vs. Zinc reference cell).
b.2 A protected hull develops a potential below 300mV (vs. Zinc reference cell).

3.2 Start up (drw.0000/369/1 mod.O)

Star up ,the POWER ON lamp (pos.2) will light.

When power supply is switched on, LCD display screen (pos.l) will show different start screens one
by one, starting with company name screen.
(Note: This will happen when system is set to normal conditions: if settings are not correct during
· start up, two methods can be enforced.
~simply turn off power and turn back on again.
-Remove reset jumper to reset position for one second then return reset jumper to the non connector
position.) ·

<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>
<*** ACG S.r.l
<*** ICCPSYSTEM
<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>

Fig 1.

Two seconds after the ACG S.r.l screen has been displayed, the ICCP system screen will appear.
In this instance the computer has been initialized (Fig.2)

Marimpress ICCP 300A - Page 6

 ##### ICCP SYSTEM #####
PLEASE WAIT .. • . . . .. . ..

Fig 2.

After another two seconds, system LCD screen will confirm initialization is complete (Fig.3).

COMPLETE !! !!! !!!! !!!!!

Fig3.

The next screen to be indicated is the self test screen which will begin initialization, also the J4
connector, control and check will begin running (Fig.4 and Fig.5).

Please wait for SELF TEST ......... .

Fi!~ 4.

***** J4 is CONNECTED*****

FigS.

Once the previous set up is complete and there have been no problems during the check with regards
to the co11trol and PCB board then the system is ready to run as normal. .
Should a problem arise during any of the set-up procedures, then an -error" message will be
indicated.
Once the self test has been fully initialized (Fig 6.) the display will indicate the current capacity of the
system and the type of electrodes for some seconds. During this time, should the ESCAPE key be
pressed then the system will automatically move to (Fig 7).

CAPA CITY : 300 AMP

ZINC ELECTRODE

Fig 6.

Fig 7. indicates the system setting conditions: i.e-number of cells to control self test time, fan

Marimpress ICCP 300A - Page 7

temperature intervention CCC), self test time (# hours), remote alarm (on/off), input power phase (#
phases), fresh water detection (on/off).

<*><*> ICCP SYSTEM STATUS <*><*>

CELL No. : 2 FAN: 60 oc
SELF TEST : 8HRS PHASE: 3
ALARM ON FRESH WATER: OFF

Fig 7.

(Fig 8.) will be displayed 5 seconds later, if desired, (Fig 8.) can be displayed during this five seconds
period by pressing the ENTER key.
To start the system control, all preparation of control rules and input frequency will be calculated
and initialized automatically.

<<<<< STAND BY >>>>>

CELL#1 xmV CELL#2: ymV
VOLTAGE: z VDC CURRENT: wA
TEMP: 22 oc FREQ.: 60Hz

Fig 8.

(Fig 10.) will indicate two seconds after (Fig 8.) or should ENTER key be depressed whilst still in the
(Fig 8.) mode, (Fig 10.) will be shown immediately.
(Fig 10.) is operational when in the manual setting state.

.>*<MANUAL>*<CURRENT; DAMP .

G
I
ELL#1: x mV
VOLTAGE: z VDC
TEMP: 22 oc
CELL#2: y mV
CURR.ENT: w A
FREQ.: · · · 60Hz

Fig 10.

On either screen under the current (Amp) line, these values are each sensor values, i.e.- Temperature,
Frequency, Current, etc.

>*<AUTOMATIC>*< CELL: 220 mV

CELL#1: xmV CELL#2: ymV
VOLTAGE: z VDC CURRENT: w A
TEMP: 22 oc FREO.: 60Hz

Fig 12.

Fig 12 will be displayed when the operation mode is set to automatic.

Marimpress ICCP 300A - Page 8

The first line cell number (220mV) shows the potential value of OFFSET. All other values represent
the operating status.

Marimpress ICCP 300A - Page 9

3.3 The Keypad (Drw 0000/369/1 Mod.O)

On the automatic PCB card there is a keypad with some pushbuttons

...
ESCAPE UP ENTER
I I I I
.... T .....
T,F', F"T' I I DOWN I I RTl,H'T'

All input data and values can be changed only through computer keypad.

ESCAPE During either the automatic or manual operation, if the ESCAPE button is
pressed, LCD display will indicate the mode selection menu. If the ESCAPE
button is depressed a second time, the initial start screens will appear. The
ESCAPE button can also be used to view previous selected screen.

... The up-cursor button is used to change the <*>, increasing the current values,
UP during the system set mode, only this key can be used to change the value of
parameters<*>.

ENTER The ENTER/RETURN key is used during the mode selection display in order to
set/lock.
This screen in its new state, once the<*><*> icon can then be moved, in order to
have locked state, simply press ESCAPE button. The <*><*> icon can then be
moved to new mode ready to be locked again using the ENTER key. During the
potential set mode display, the ENTER key will save all information and the cusor
can be moved to alternate mode.

.... The left facing cursor button is used to move the<*><*> icon to left side of LCD
LEFT display screen. The left facing cursor button is also used to change <*> value
settings from 10,100,1000 whilst in the potential set mode or the current capacity
set mode or operation set mode.
T
DOWN The down facing cursor key is used to decrease the <*> value.

..... The right facing key is used in much the same way as that of the left facing key,
RIGHT with opposite results.

Marimpress ICCP 300A - Page 10

 3.3 Operating data

3.3.1 GENERAL
To maintain a good level of hull protection the power unit should always be switched on. Shutting
down the system for a few hours will be of little significance, however if the system is shut down for
longer periods the system, once restarted, will require some time before the system re-reaches it's
optimum protection level.
Periodic preventative maintenance will extend the life of the equipment and reduce the necessity to
shutdown the system due to component failure.

3.3.2 AUTOMATIC OPERATION (drw 0000/369/B/01 mod.O)

The ICCP system should normally run in automatic mode.
If the potential is more than offset (200-220 mV), there will be an output at the anodes, and it will be
possible to read on the display current, potential and voltage data.
The system runs in a completely automatic way, with the amount of current output at the anodes
dependent on the potential condition of the hull.

The system OFFSET, is set from +200 to +220 mV. At the beginning of the life of a ship, and if the
hull is in good condition (new paint etc.) the potential on the hull is likely to be less than the OFFSET
and the cabinet will not give current output to the anodes (A=O,V=1-2). However as the paint becomes
consumed the potential will tend to rise above +220mV and the cabinet will automatically give a
current output to the anodes in order to correct this.
V= 2- 20Vdc
A= 0 -150Adc
The readings of reference cells should be between 10 and 500 mV depending on paint condition
The readings displayed on LCD should be recorded in the logpad on a daily basis.

3.4 Manual Operation

The system is completely automatic and there is usually no need for any manual intervention. However
for testing purposes . where the automation fails (eg. controller card needs replacing) it is possible to
run the. system in manua~ mode. ·
This operation can be done only under the guide of a qualified ACG technician.·
··NOTE: The system is designed to fail safe., ie. jf the reference cell signal is broken:. (below 10 mV) or
shortcircuited the current output will be reduced to zero (0 amps) and a message of erior will
be displayed on LCD screen.the correct functioning of the equipment is dependent on correct .
installation,polarity,etc.

Marirnpress ICCP 300A - Page 11

 Chapter4
MAINTENANCE

To ensure the correct working of ICCP system its performance should be monitored regularly and any
problems should be promply investigated and corrected.
All uncorrected problems should be reported to ACG for assistance.

The following information should be remembered when any attempt to service the equipment is made:

1. If the anode current is increasing, the hull protection increases and the reference potential is
diminishes
2. The optimum level of protection is a range of potential between -0.75 to -0.85 V (vs Ag/AgCl)
corresponding to + 0.3 to +0.2v (vs Zn)
3. Increasing anode current above the protection level doesn't improve corrosion protection. It
does waste power and can damage paint.
4. If the hull potential is over the set value (> +200mV to +250mV vs Zn), the output of the
power supply increases until the reference cell potential equals the set value whereupon the
anode current should stabilize.
5. Under normal operating conditions the values of the potential vary slight with the salinity of
the seawater, draft and vessel speed, but these variations should be not interpreted as system
faults.
6. The output readings will increase with time due to possible paint damage or deterioration.

4.1 Preventative Maintenance

Preventative operation will extend the life of the equipment and reduce the necessity of shutdown
due to component failure.

4.1.1 POWER UNIT

Visually inspectthe electrical connections to the power supply and particulary the ground connections
(NEGATNE, RIF +)'to the hull for loose or corroded connections.

4.1.2 REFERENCE CELL

Normally the reference cells will not require any maintenance works between drydocking periods. A
visually inspection, every six months, is enought to check the state of the cable runs between the
power supply and the reference cell.
During the drydocking period, the electrode cofferdam should be opened from inside the vessel and be
inspected for any deterioration caused by leakage or condensation.
4.1.3 ANODE
Every Six Months: The hull penetrations of the anodes should be checked. The cofferdam cover
should first be opened (making sure that there is not water pressure inside them). The general
condition of the inside of these cofferdams should be noted for future reference.
Where junction boxes are fitted between the anode cofferdam and the power unit, the cable
connections should be checked for continuity to ensure that the anodes are connected to the power
unit.

Marimpress ICCP 300A - Page 12

4.1.4 PROPELLER SHAFT EARTHING- SLIP RING

Every Week: Check the grounding assembly for cleanliness. The slip-ring should be degreased from any oil
that has built-up and any dirt should be removed to avoid the blocking of the brushes and brush holder.
1J.spect the brush copper leads to ensure they have not become loose or corroded.
The brush wear should be noted and if necessary adjust the compression of the springs on the brush to
ensure good electrical contact.

4.1.5 RUDDER BOND

Every Week: The rudder bonding cable should be checked to ensure it has not suffered any mechanical
damage and that there is good electrical continuity between the vessel's hull and the rudder stock.

4.1.6 OPERATING LOG

To ensure continued optimum hull protection the operating log should be filled out on a daily basis and
forwarded every month to the company. The information contained in the log will enable the ACG engineer
to identifying potential system problems.
Any deviations on the log sheet should be highlighted by separate letter. These deviations wiJJ he analized
and promptly answered

LOG SHEET DATA

The data recorder on the log sheet is useful in determining the total system performance. The log sheet will
show if the ICCP system is functioning to maintain the hull potential at the desidered value.
The readings using the portable reference cell should correspond to the readings given by the hull· reference
cell.

1. List ship position and sea temperature (0 C)

2. List all reference electrode potential readings (mV) and location on the hull.
3. List all anode locations and their current and voltage readings and location.
4. 'List all separate ICCP systems installed with model number and location.

The number of suspect anodes that will require attention at the vessel drydocking can be determined from
this data. A visually inspection wiil determine if an ariode must be replaced:

Marimpress ICCP 300A - Page 13

4.1.7 MAINTENANCE CHART

FUNCTION Daily Weekly Montly Six

Month

1. Inspect reference
cell cables X

2. Clean Controller X

3. Clean Power Supply X

4. Inspect Anode
Connections X

5. Inspect (and Clean) Slipring X

6. Inspect Rudder Bonding X

7. Take Log readings X

8. Test System Meters X

4.2 Overhaul Schedule

4.2.1 PRE-DRYDOCKING INSPECTION

This service can be carried out by the vessel's crew. This inspection should be carried out before the
scheduled drydocking while the vessel is at sea and underway or while is at anchor in salt water. This
inspection is not to be taken alongside a dock or in fresh or brackish water.

4.2.1.1 HULL POTENTIAL ..

An Ag/AgCl portable cell (or Zn portable cell) is needed for this inspectiol}.
The readings are taken by attaching one lead of the portable ·reference cell to the vessel's hull (avoid
proximity of anodes) and dropping the electrode into the water adjacent to the hull to a depth of between 3 ·
and 6 meters
The first reading should be taken at about 15 meters from the forward perpendicular and every 60 meters
thereafter. One reading should be taken at or near the hull frame of the system reference cell.

4.2.1.2 REFERENCE CELL PERFORMANCE

Record on the log sheet, the DC potential (mV) of each hull reference cell using the millivoltmeter in the
power unit.

4.2.1.3 ANODE PERFORMANCE

a. List the total number of the anodes on the hull and their position.
b. Place the power unit in the manual mode.
c. Remove all the anode fuses except the one being measured and gradually increase the
manual control on the power unit. Measure the anode voltage and current using the

Marimpress ICCP 300A - Page 14

 voltmeter and ammeter on the electric cabinet at intervals of 2 to 3 V. Current should be
(for each anode): 0-75 A 2-20V
d. Don't exceed 85% of the amperage rating of the anode being tested. ie. given a 300A
power supply with two 150A anodes, the maximun current allowed to pass throught the
anode during the test would be 127A.
e. Restore the equipment to the automatic operation mode with all anode fuses connected.

4.2.1.4 LOG SHEET DATA

Enter the data normally submitted on the daily log sheet at the time of this survey.

4.2.1.5 EVALUATION OF DATA

The data collected from this inspection will be used in determining the total system performance and will
pinpoint areas for repair.
a. An evalutation of the log-sheet will show the control system is functioning to mantain the
hull reference cell at the desidered value.
b. The hull survey will show if the entire hull is being protected and to what degree.
TAB.l

HALF CELL TYPE CORROSION IDEAL PROTECTION OVER-

ZONE ZONE PROTECTION
ZONE
Ag!AgCl -0,6V -0,75V to 0,85V -l,OV or higher
Zn + 0,45V or more + 0,3 V to 0,2V 0,05V or less

N.B.Vessels with a Zinc hull reference cell will have to correct the portable reference cell readings before a
comparison can be made (table 1).

4.2.2 DRYDOCK INSPECTION

4.2.2.1 · ANODE

· The first operation is check the physical state of each anode. Check the state of the encapsulating material
and stud hole filler. The anode should be securely fastened to the hull, and all areas of possible water ingress
between the anode and the hull are to· be sealed with epoxy mastic coating. A sign of water ingress will be
the build-up of a calcreous deposit around the anode.

4.2.2.2 DIELECTRIC SHIELD

Examine each anode's dielectric shield for damage. If the damage area is small, grit blast to bright metal and
patch. If the damaged area is large, grit blast the entire shield area to SA3 or better and apply a new shield.

4.2.2.3 REFERENCE CELL

Examine each reference cell for physical damage or marine damage over.

Marimpress ICCP 300A - Page 15

 ChapterS
FAULT FINDING
5.1 Display of faults

Should an abnormal condition occur, the alarm screen will be activated. At this point, once enter key is
pressed this will display first alarm message.

<?>ALARM CHECKING STATUS more ->

CELL#l OVER PROTECTION FAULT
LIMIT 0-500 510 m V

Fig 14.
Fig 14. Displays when cell #1's input limitation range is over the set value. i.e. 10-500mV
Alarm message will be shown if over 500 (i.e. 510mV)
10 N being under limit. 500 N being peak over limit
The right hand side of screen 510mV shows existing value.

<?>ALARM CHECKING STATUS more->

CELL#1 UNDER PROTECTION FAULT
LIMIT 10-500 7 m V

Fig 15.
Fig 15. displays when cell #1's input limitation range is under the set value.
Screen shows under limit of set value and existing value.

I <?>~1\.R.M CHECKING STATUS more->

CELL#2 OVER.PROTECTION FAULT
LIMIT 0-500 510 m V

Fig 16.
Fig 16. displays when cell #2's input limitation range is over the set value.
Screen shows over limit of set value and existing value.

<?>ALARM CHECKING STATUS more->

CELL#2 UNDER PROTECTION FAULT
LIMIT 10-500 7 m V

Fig 17.

Fig 17. displays when cell #2's input limitation range is under the set value.

Marimpress ICCP 300A - Page 16

Screen shows under limit of set value and existing value.

<?>ALARM CHECKING STATUS more ->

TEMPERATURE OVER PROTECTION
FAULT
LIMIT 0-50 65° C

Fig 22.
Fig 22. displays when temperature's input limitation range is over the set value.
Screen shows over limit of set value and existing value.

<?>ALARM CHECKING STATUS more->

TEMPERATURE UNDER PROTECTION
FAULT
LIMIT 0-50 -10° C

Fig 23.
Fig 23. displays when temperature's input limitation range is under the set value.
Screen shows under limit of set value and existing value.

<?>ALARM CHECKING STATUS more->

VOLTAGE OVER PROTECTION FAULT
LIMIT 0-20 25 VDC

. Fig24.
Fig24. displays when voltage's input limitation range is over the set value.
Screen shows over limit of set value and existing value.

<?>ALARM CHECKING STATUS more->

CURRENT OVER PROTECTION FAULT
LIMIT 0-400 420 AMP

Fig 26.
Fig 26. displays when current's input limitation is over the set values.
Screen shows-over limit of set value and existing value.

Marimpress ICCP 300A - Page 17

(
5.2 Fault finding

mV -readings show negative values

Reason Solution

The AUTOMATIC CARD is faulty Replace the AUTOMATIC CARD

The reference cells is broken Check the the reference cells

There are some wrong connections Check the external wiring connections

m V -readings show values greater than +500mV

Reason Solution

the ANODE CIRCUIT is faulty check the negative cable and connections
check the anode fuses and connections
the vessel is in FRESH water if the vessel will remain in FRESH WATER
for more than 12 hours switch off the
system
the ANODE needs replacing replace the ANODE

m V -readings show values greater than +300m V and

Voltmeter = l.SVde ;·Ammeter = 0
". .......

Reason Solution
,. '.
·-

I the AUTOMATIC CARD is fa:ulty replace the AUTOMATIC CARD

mV-meter shows a value ofO (zero)

Reason Solution

the REFERENCE CELL has been short check the reference cell and its connections
circuited or has been disconnected

Marimpress ICCP 300A - Page 18

 Chapter6

FUNDAMENTAL PRINCIPLES OF CORROSION

Corrosion on a ship's hull in sea water is an electrochemical phenomen caused by the formation of a
multitude of galvanic cells on the hull's metal surfaces.
Corrosion current flows , like in a battery, from the metal parts that are more active (anode) to the metal
parts that are less active (cathode), through seawater. The anode corrodes whilst the cathode is protected
from corrosion.
Galvanic cells are formed not only between metals of different types, but also between different zones of the
same metal. In this case the areas that are less protected by the paint act as anodes with respect to those areas
that are well protected.
To give an idea of the damaged caused by corrosion, it must be remembered that the corrosion current has a
direct relationship to the amount of metal that is corroded.
A current of lA causes the corrosion of lOKg of steel in 1 year. The intensity of the corrosion current in
2
normal circumstances mar vary between 10- 15 rnNm . In particular cases the current density may rise to
as high as 80 - 100 mAim .
The intensity of the corrosion depends on:
a) the difference in potential between the anodic and cathodic zones
b) the surface area of the anodic and cathodic zones
c) the condition of the paintwork
d) the temperature of the sea water
e) the salinity of the sea water
f) the oxygen content of the sea water
g) the ship's velocity
h) for vessels undergoing work, the current output by the welding equipment.

Marimpress ICCP 300A - Page 19

 Chapter 7
THEORY OF CATHODIC PROTECTION

The aim of cathodic protection is to polarise cathodically the surface to be protected, the ship, using various
types of anodes. The current output by the anodes counteracts the corrosion current. There is only one way
to check the condition of the immersed hull, that is to measure the potential on the hull using a probe
(reference cell). The reference cell can be made of Zn or Ag/Ag Cl. Zinc is used for the cathodic protection
of hulls whose projected potential is not more than 450mV. A hull is protected if its potential lies between
+220- +250mV.
If the hull's potential falls below +lOOmV, then the hull becomes over-protected which can cause problems
with the paintwork. It is very important therefore not only that the hull doesn't become under-protected, but
also that it doesn't become over-protected.

There are two main types of cathodic protection:

7.1 Sacrificial Anodes

They consist of a material less noble than the hull which they protect. They are connected directly (shorted)
to the hull. They are called sacrificial anodes because they are consumed by the very action of protecting the
hull. The intensity of the current they produce for the protection of the hull is proportional to the rate that
they are consumed. For the protection of steel hulls in sea water zinc anodes are most commonly used.
Because the anode potential between zinc and the hull is only 0.5Vdc, the maximum current output depends
on the size of the anode. A certain number of zinc anodes are fixed to the hull especially near the stem. The
current output by zinc anodes cannot be controlled or regulated automatically. The system will not
automatically respond to the continuous variations in current demand due to different situations (eg. ship
speed, sea water temperature I salinity, etc.) Zinc anodes are consumed during the protection process and
must therefore be renewed on a regular basis (every drydocking).
'

7.2 Impressed Cun-ent

This system is b.ased on the continual measurement of the.potential on the hull using zinc (or Ag/AgCl)
reference cells which regulate the amount of ·compensating current output by the permanent activated .
titanium anodes. The anodes are strategically positioned on the hull in order to provide optimum and total
hull protection. The reference cells are positioned on both sides of the hull. The electric cabinet can output
up to 20Vde allowing for impressed currents tens of times greater than that available with sacrificial anodes,
and as such can cope with the full range of possible hull potentials. The ideal potential (OFFSET) is set to
+220mV for steel hulls and any deviation from this potential is immediately corrected by automatically
outputing an impressed current. In this way the potential on the hull is maintained as near as possible to the
ideal value under which the hull is immune from corrosion. It is also possible to protect the ship's axle by
short-circuiting it using a ring (slip-ring) and graphite brushes. Similarly it is possible to protect the rudder
and any other appendages by earthing them.

Marimpress ICCP 300A - Page 20

 ChapterS
LIST OF DRAWINGS
··-.:-

TITLE DRAWING NO.

INSTALLATION DIAGRAM P-D-2333 Mod.Ol

ANODE TYPE 150A P-C-2320 Mod.06

ANODE ASSEMBLY P-C-2520 Mod.O

REFERENCE CELL WITH FLANGED PIPE P-C-2442 Mod.07

ELECTRIC PANEL 0000/369/01 Mod.O

. EXTERNAL WIRING CONNECTIONS 2374/518/t Rev.O

RUDDER EARTHING P-C-2492 Mod.02

DIELECTRIC SHIELD P-C-2461/E Mod.06

SLIP RING P-C-8725 Mod.O

REMOTECONTROLPANEL P-C-8727 Mod.O

Marimpress ICCP 300A - Page 21

 I
I
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REFERENCE CEll : l,
... ',
................................. -:-. ...............

ELEGRIC CABINET ................... ...... .....

',

ANODE

SHAFf MONITOR

REFERENCE CELL

'-----ANODE
SUP RING
RUDDER EARTHING

OBJECT

REV. DAlE DESCRIPTION DESIGN FILE AZIENDA CHIMICA V!aVezzanlla

0 25-03-1996 FIRST EMISSION S.F. P-D-2333.DWG GENOVESE 16159GENOVA-ITALY
01 10-03-1999 REVISION S.L.
MARIMPRESS ICCP SYSTEM
1 SYSTEM-INSTAUATION DIAGRAM
MOD.

P-D-2333 01
 r-----------------------------------------------DIAS20mm.------------------------------------------------4

492mm.--------------------------------------------~

~--------------------------------------445--------------------------------------~
HULL

FLANGE DIA I00 mm.

K- 75 mm. WJTH 4 HOLES DIA 11 mm.

POS. DESCRIPTION MATERIAL O.lY

I ANODE AGIVATED TITANIUM
2 . FIXING M10 x 55 ANODE STUDS INOX 12
3 COFFERDAM GRADE A I
4 GASKET RUBBER
5 ISOLATING SLEEVE PVC
6 FIXING WASHER STEEL
7 M14NUT BRASS 2
8 WASHER BRASS 2
9 COVER STEEL
10 INSPEcnON CAP STEEL "
11 GASKET RUBBER
12 MB x 50 FIXING COVER STUDS IN OX 8
VIa Vezzanl J8
13 CABLE GLAND BRASS I6 J59 GENOVA-ITALY
14 FLANGE STEEL
15 LUG BRASS
16 ISOLATING HEAD PVC
17 0-RING RUBBER 2
06
 1 - - - - - - - - - - - - - DIA219 mm. - - - - - - - - - - - - - - - - 1
!-------·-----DIAl91mm-------------------l FULL PENETRATlON WELDING WITH STEEL PlATING

.5

M----+ FUINGE DIA I 00 mm.

K- 75 mm. WITH 'I HOLES DIA II mm.

POS. 0. DESCRJPTJON MATERIAL DIMENSION ..

COFFERDAM GRADE A see dwg.
FIXING BOLTS STAINLESS STEEL HB x 45
REFERENCE CELL ZINC Oi~m.46mm H=1Z0mm
HEAD PVC Diam.: 190 mm.
NUT BRASS HS
CABLE COPPER 1 x 10 mm 2 SHIELDED
CABLE FLANGE STEEL DIA ext.: 100 mm. K = 75 mm. with 4 holes DIA 11 mm.
GASKET RUBBER Diam.ext.:315 mm Diam.int.:190 mm Thkh:3 mm
GASKET RUBBER Diam.ext,:180 mm Di~m.int:71 mm Thich:3 mm
10 INSPECTION CAP STEEL 1/Z" VIa Vez>anl 18
16159 GENOVMTM.Y
11 WASHER BRASS DIAH.:14 mm
12 1 COVER STEEL DIA.:320mm k=280mm WITH 6 HOLES DIA.:18mm MARIMPRESS ICCP SYSTEM
13 1 CABLE GLAND BRASS 3/1," REFERENCE CELl WITH FLANGED PIPE
14 BOLTS WITH NUTS STAINLESS STEEL H16 x 70
15 LUG BRASS
16 0-RING RUBBER
 r---------------------------------------~--------------------~------------,

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MARIMPRESS ICCP SYSTEM I
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Ill .....- u.J ~
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3 X 440 V - 60 Hz. .....- VI .....- VI

OR
3 X 380 v - 50 Hz.

-
(Tab.1 RECOMENDED CABLE SIZE FOR ANODE 50 A)
CABLE SECTION CABLE RUN
25 mm~
35 mm~
40 m.
57 m. R- R- I
I f=tI I
I f=t-I
50 mm~ 87 m.
REF.CELL N. 1 REF.CELL. N. 2 ANODE N. 1 ANODE N. 2
70 mm~ 140m.

(Tab.1 RECOMENDED CABLE SIZE FOR ANODE 75A/100A) (Tab.1 RECOMENDED CABLE SIZE FOR ANODE 150A) (Tab.1 RECOMENDED CABLE SIZE FOR ANODE 200A)
~
r--·
0 CABLE SECTION CABLE RUN CABLE SECTION CABLE RUN CABLE SECTION CABLE RUN
0
~~ w 25 mm~ 35 m. 50mm 2 30m. 70 mm 2 30 m.
~
1--
c ....
,!. 35 mmf! 50 m. 7Cmm 2 48 m. 95 mm 2 48 m.
"' 50 mm? 60 m. 120 mm 2 90 m.
0:
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CHIMICA MARIMPRESS ICCP SYSTEM 2374/518/1 0
GENOVESE EXTERNAL WIRING CONNECTIONS DRAWING N. SHEET
FILE 518-A-03-1.DWG -! e-mallinfo@acgmarine.com ~nJ I ni.J C:Ut'~T DI:'V n
 HULL

SEE DETAIL 'A'

L - I m. COPPER CABLE
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I WENT I JOB N. I OBJECT

REV. DATE DESCRIPTION DESIGN Fll£ AZIENDA CHIMICA

0
01
10-09-1996 FIRST EMISSION
22-03-2000 REVISION
.S.F
S.L
P-C-2492.0\.VG

-. - - --·--- - - - - -
6
TITLE
GENOVESE
Vra Vezzani 18
16159 GENOVA-ITALY
:
MARIMPRESS ICCP 2 'STEM
02
i
29- '0-2002 REVISION L_ ____ -
~-: ~- . ---- ·------~
RUDDER EARTHING
:

··~ ·- ---- ·-
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10-09-1996
10-09-1996 I P-C-2492 I021
 ~------------------------0----------------------~~

DIELEGRIC SHIELD

DIELEGRIC SHIELD l IDIELEQRIC SHIELD

HULL PART. 1

SEQION A-/\ .

DIELEGRIC SHIELD QUANTITIES

ANODE1YPE ANODE
DIAMETER (D) Lt/ ANODE
25A I.Smt Bit
SOA 2.5 mt 16ft
?SA 3mt 241t.
IOOA 3mt 24ft.
JSOA 4mt 40 lt.
200A Smt. 56ft

CLIENT JOB N OBJECT I HULL N

REV. DATE DESCRIPTION DESIGN FILE AZIENDA CHIMICA
·a10-01-199 8
01 20-05 1998
FIRST EMISSION
REVISION
S.F.
S.F.
P-C-2461(DWG
!1
TITLE
GENOVESE
VJa Vezzani 18
16159 GENOVA-ITALY

02 26-07-1999 REVISION S.L. . MARIMPRESS ICCP SYSTEM

03 21-04-2000 REVISION S.L. DIELECTRIC SHIELD
04 13 03 2001 S.L. SIGNATURE DATE SCALE FOHMAT DRAWING N.
REVISION DESIGNED I<;;·~ 10-01-1998 I
HOD. N.
05 19 03-2001 REVISION S.L. CHECKED ;1/A:, 10-01-1998 P...C-2461/E 06
APPROVED -i1.JlA 10-01-1998 I
06 05 11-2003 REVISION S.L.
 BRUSH HOLDER STRUCTURE
BRUSH HOLDER STRUC!URE (SEE DRAWING P-C-8309)

40 X 20 X 5

TO
STERN TUBE
TO MONITORING
PANEL
MONfTORING
PANEL
BRUSH HOlDER STRUOUR£

BEARING

VIEW A-A

A-A- VIEW
TO
MONfTORING
PANEL LEGEND
I- STRUCTURE FOR FIXING
2- BRUSH HOLDER
3- BRUSH
4- ISOlATED PIN
5 - FIXING STUD
TOP VIEW 6 - EARTHING CABLE TERMINAL- I x 70 mm 2
BRUSH HOLDER STRUCTURE CORE FLEXIBLE CABLE
7 - BRUSH COPPER BRAID
8- REGUlATION BOLT
9-SUPRING

~ 200 300 400 450 700

(mmJ
PART. I X
(mmJ
33 32 31 30.5 28
BRUSH HOLDER Wf11-l
TWO BRUSHES
OBJHT
ISOLATED BRUSH HOLDER Wf11-l REV. DATE DESCRIPTION DESIGN FILE
ONE BRUSH
01
02
11-11-1997
13-11-1998
04-03-1999
FIRST EMISSION
REVISION
REVISION
S.L.
S.L.
S.L.
P-C-244B.DWG

ITLE
l1 A21ENDA CHIMICA
GENOVESE
V1a Vezzanl 18
16159GENOVMTAlY

03
MARIMPRESS JCCP SYSTEM
15-07-1999 REVISION S.L.
04 19-01-2000. S.L.
SUPRING INSTALLATION EXAMPLE
REVISION
05 DAAIIJU
16-06-2000 REVISION DIMENSIONS S.L. [)(SIGNED
VIEW B-8 06 06-11-2001 REVISION DIMENSIONS S.L. CHECXEO P-C-2448
07 10-12-2001 REVISION DIMENSIONS S.L. APPROVED
 MONITORING PANEL
4 holes
Diam.6 mm

170 185 185

/'

FRONT VIEW L:_155_j

SIDE VIEW
r-----------------------,
MONITORING
PANEL

_______ ....
1..-------
8 2
.___:_:_Ix-'----4'---'-m.:. .C:.m-'-'------/l//ll/1111" · HUlL

STUGUREFOR
FIXING BRUSH
HOlDER to be welded
sec Dvvg.P-c-8309 to a firm

EARTH
REFERENCE BONDING
~----l_x_70_m_m_._ _ _ _CA_BLE
2
BRUSH __ , /[III''' HUlL
11111

REV. ()..o\TE DESCRIPTION DESIGN RlE

0 15-09-1996 FIRST EMISSION S.F. P'C-ZJBI.DWG
01 20-09-1997 REVISION S.F.
02 10-10-1997 REVISION S.F.
03 25-05-2000 REVISION DIMENSIONS S.L.
04 10-07-2002 REVISION DIMENSIONS CABLES S.l.

CLIENT OBJECT

A AZIENDA CHIMICA VIa Vc:zzanl Ia

ti GENOVESE 16159 GENOVMTN..Y
TilLE
MARJMPRESS ICCP SYSTEM
SUP RING WITH BRACKET FOR PROPELLER SHAFT \XIlTH
MONITORING PANEL
SUP RING SIGNED
/'100 N

CHECKED
APPROVED
P-c-2381 04
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850 600
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VIEW A-A
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2 -VOLTMETER 7 - 'AUTO' lAMP
3 -A-METER 8 - 'OVER-PROTEOlON' LAMP
4- MIUNOLTMETER 9 - 'UNDER PROTECTION' LAMP (OPTIONAL)
5 - MAIN SWITCH I 0 - 'REF. CELL I - REF. CELL II' SWITCH

CUSTOMER JOB I OFFER N OBJECT

REV. DATE DESCRIPTION DESlGN RtE

0 05-05-1996
01 12-01.-1998
02 15-10-1998
FIRST EMISSION
REVISION
REVISION
S.F.
SJ.
S.F. • S.L.
P-C-8326.DWG
fi
Till£
AZ/ENDA CH/M/CA
GENOVESE
VIa Vezzan! 18
16!59 GENOVA-ITN.Y

03 22-07-1999 REVISION S.L.

MARIMPRESS /CCP SYSTEM
04 10-02-2000 REVISION S.L. ELECfR/C PANEL 1YPE 300A- SOOA
05 13-06-2000 REVISION S.L. SIGNA lURE DATE SCALE FORMAT DRAWING N. HOD 1.

"''
0 Sl N 0 05-0S-1996
06 06-02-2001 REVISION S.L. (H£ KED 0/A.. 15-07-2002 I
07 26-07-2002 REVISION S.L. APPROVED L ,(J 15-07-1002 I P-c-8326 08
08 28-10-2002 REVISION SL.
 .----- N. 4 MOUNTING HOLES M20
\
810

\II 750

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2 ~ "POWER ON" tAMP
3 = "FAN" LAMP
4 = DISPLAY PUSH BUITON

CLIENT I JOB N I 0°FER N I OBJECT I HULL N

REV. DATE DESCRIPTION DESIGN FlL£

0 28-10-2004 FIRST Ei'11SSION S.L 369-03-1DWG
!i
TITLE
AZIENDA CHIMICA
GENOVESE
VJa Vezzani 18
16159 GENOVA-ITALY

MARIMPRESS ICCP SYSTEM

ELECTRIC PANEL 7YPE.300Aj0- 400Aj0
DESIGNED
S1G/l_l. lURE
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DAlE
28-10-2001,
SCALE FORt<1AT DRAWING _N. ! C)
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I
28-10-200'
18-10-100'·
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 ~------~--168----------~
SECTION C-C

COVER

8 1 0
1 0 1 8

4 HOLES DIA 6 mm.

4 HOLES DIA 6 mm.

VIEW B-B
VIEW A-A

MONITORING PANEL

. STUGURE FOR
FIXING BRUSH HOLDER TO BE WELDED
TO A FIRM FOUNDATION c
I
REFERENCE BRUSH
{INSULATED PIN) ,_._1_x_7_0_m_m_~___EA_R_TH_B_O_N_D_IN_G_CA_B_LE__ 1IIII!illl 1,,. HULL

BRUSH HOLDER WITH TWO BRUSHES

REV DATE DESCRIPTION DESIGN FILE

0 10-07-2002 FIRST EMISSION SL P-C-8727.DWG
01 25-11-2004 REVISION S.L.
02 23-02-2005 REVISION DIMENSIONS S.L.

CLIENT OBJECT I HULL N.

A AZIENDA CHIMICA Via Venani 18

U GENOVESE 16159 GENOVA-fTALY

TITLE
MARIMPRESS ICCP SYSTEM
SUP RING WITH BRACKET FOR PROPELLER SHAFT WITH
MONITORING' PANEL
AT SCALE FORHAT DRAWING N. HOD. N.

02
 BRUSH HOLDER STRUCTURE BRUSH HOlDER STRUOURE !SEE DRAWING P..C-8309)
TOP VIEW
HULL

STERN TUBE
TO
MONITORING
PANEL
SUPPORT

T
A
VIEW A-A

A-A- VIEW
TO
MONITORING
PANEL . LEGEND

I • S'TRlJClURE FOR FOONG ..

2 • BRUSH HOLDER
3· BRUSH
BRUSH HOLDER STRUOURE 4 • ISOLJA.TED PIN
5 • FIXING STUD.
6 • EMTHING CA.BLE TERMIN/\1.-
CORE FlEXIBLE CA.BLE
MIN 15 mm.
7 • BRUSH COPPER BRAID
8 • REGUIJA.TION BOLT
9 ·SUI'RING

ISOLATED BRUSH HOlDER \IVITH ·.

ONE BRUSH AZIENDA CHIMICA 111!1 \ll!mrl 18
16J59GENOVMTN..Y
GENOVESE
MARIMPRESS ICCP SYSTEM
SUPRING INSTALlATION EXAMPLE
VlEWB-8