Cathodic Protection Technology Pte Ltd Website: www.cptech.net Email:
[email protected] Tel: +65-6862 3551 Fax: +65-6861 6436
SHIPS’ CATHODIC PROTECTION SYSTEM ZINC & ALUMINIUM HULL & TANK ANODES Corrosion causes frictional drag on the ship’s hull which in turn leads to higher operating cost. A high quality coating provides a smooth hull and together with a well-engineered cathodic protection system, helps to ensure that the surface is maintained in good condition. Sacrificial anode systems are commonly used for external hull cathodic protection as they are virtually maintenance free. Anodes for the external hull are designed to protect local areas and are evenly spread to ensure a good distribution of current. Anodes located in the stern area are normally spaced closer together because turbulence in this area increases oxygen content in the water making it more corrosive and hence a higher current density is required to provide cathodic protection. Cathodic protection of ships’ cargo and ballast tanks is effected using sacrificial anodes. Zinc and/or aluminium anodes are used and the material selection depends on the compatibility of the alloy with the service of the tank. Aluminium anodes are acceptable in cargo/ballast tanks provided they are not located at a height (in metres) greater than ‘27/W’ where W is the total mass of anode and core (in kg). Zinc presents no spark hazard and thus zinc anodes are commonly used throughout. Magnesium anodes present a spark hazard and are not allowed, except as ribbon for descaling. CP TECH produces GALVALUM Specification 18001K.
®
aluminium anodes as well as zinc anodes conforming to US Military
®
GALVALUM is CP TECH’s proprietary aluminiumzinc-indium alloy and has been long-term tested by Det Norske Veritas (DNV) and obtained its Type Approval Certificate, complying with DNV's recommended practice B401 and NORSOK Standard M-503 Cathodic Protection Long-Term Testing. It has a high driving voltage and capacity, allowing high current output and reduced weight from anodes in all applications.
CHEMICAL COMPOSITION (%)
ALUMINIUM CP TECH GALVALUM®
ZINC US MIL SPECS 18001K
Iron (Fe)
0.13 max
0.005 max
Silicon (Si)
0.20 max
Copper (Cu)
0.006 max
0.005 max
CP TECH operates from modern purpose built plants and offices in Singapore and Malaysia. The company’s head office is in Singapore and is located together with the manufacturing plant on a 4,400m² site at Tuas, Singapore's major industrial area and has a built up area of 1,500m². In Malaysia, the facility is located in the Senai Industrial Estate, Johor, about half an hour drive from Singapore and has a land area of 4,000m² and built up area of 2,500m². The combined annual capacity of both the plants is in excess of 10,000MT of zinc and aluminium anodes.
Cadmium (Cd)
0.025 - 0.070
Indium (In)
0.01 - 0.02
Lead (Pb)
0.006 max
Aluminium (Al)
Remainder
0.10 - 0.50
Zinc (Zn)
2.00 - 6.00
Remainder
Others
0.02 max (each)
0.10 max (total)
CP TECH is committed to providing good quality products and services on time and at competitive prices, as evidenced by the quality of its staff and accreditation of its Quality Management System to ISO 9001 by Det Norske Veritas (DNV) for the design and manufacture of cathodic protection systems since 1994.
Cathodic Protection Technology Pte Ltd Website: www.cptech.net Tel: +65-6862 3551
E-mail:
[email protected] Fax: +65-6861 6436
CP TECH / WILSON WALTON
MARINE ANODES
Aluminium Hull Anodes Type W131 W130 W111 W114 W117 W119 W118 W124 W126 W128
A 340 350 530 650 650 650 650 1015 1015 1015
B 200 270 395 550 550 550 550 915 915 920
C 95 150 150 127 130 130 130 130 130 130
D 30 30 30 50 65 75 96 50 75 104
Gross Wt 1.4 3.2 5.2 9.8 11.6 14.1 18.0 16.0 24.0 33.0
B 305 305 305 305 305 305 456
C 75 75 90 152 152 152 102
D 38 40 45 32 35 38 53
Gross Wt 4.5 5.0 6.8 8.5 9.7 10.0 15.0
B 585 585 585
C 134 142 149
D 37 53 69
Gross Wt 18.3 26.3 36.3
B 270 400 550 550 550 550 915
C 150 150 130 130 130 130 130
D 32 32 50 65 75 96 50
Gross Wt 7.1 12.0 22.5 27.0 34.7 44.9 36.5
B 220 290 280
C 75 100 150
D 38 50 75
Gross Wt 2.6 5.0 10.7
Zinc Hull Anodes Type Z41 Z50 Z64 Z81 Z93 Z100 Z140
A 425 425 425 425 425 425 625
Zinc Hull Anodes Type Z170 Z250 Z350
A 750 750 750
Zinc Hull Anodes Type W6Z W11Z W14Z W17Z W19Z W18Z W24Z
A 370 530 650 650 650 650 1015
Zinc Hull Anodes Type WP2 WP5 W10Z
A 300 370 370
All dimensions in mm & weight in kg
Cathodic Protection Technology Pte Ltd Website: www.cptech.net Tel: +65-6862 3551
E-mail:
[email protected] Fax: +65-6861 6436
CP TECH / WILSON WALTON
MARINE ANODES
Welded Hull Anode Type S2 S3 S4 S4E
Type S6 S8 S9 S9E S9F
A 238 350 350 350
A 300 300 300 300 300
Type S18
B 150 200 200 200
C 75 100 100 100
B 150 150 150 150 150
A 800
C 270 270 270 270 270
B 75
D 25 20 30 40
D 20 25 30 40 50
C 50
Zinc
Aluminium
Gross Wt 1.7 3.0 4.2 6.3
Gross Wt 0.7 1.4 1.7 2.7
Zinc
Aluminium
Gross Wt 6.5 8.0 9.5 12.0 14.6
Gross Wt 3.0 3.5 4.1 5.0 6.0
Zinc
Aluminium
Gross Wt 19.0
Gross Wt 7.5
Aluminium Bolted Hull Anodes Type A36B A45B A84B A114B RF80 MF93 RF96 RF118 RF155
A 305 305 300 456 540 400 540 460 540
B 76 80 150 102 130 150 140 200 200
C 36 38 30 53 53 60 64 64 65
D 205 205 200 230 340 180 340 260 340
EØ 19 17 18 23 26 26 26 26 26
FØ 50 50 32 60 60 60 60 60 60
Gross Wt 1.9 2.0 3.6 5.0 8.0 9.3 9.6 11.8 15.4
D 205 205 200 230 340 340 180 260 340
EØ 19 17 18 23 26 26 26 26 26
FØ 50 50 32 60 60 60 60 60 60
Gross Wt 4.1 4.5 8.4 12.1 19.7 23.7 23.0 30.8 40.0
Zinc Bolted Hull Anodes Type Z36B Z45B Z84B Z114B 20RB 24RB 23MB 30RB 40RB
A 305 305 300 456 540 540 400 460 540
B 76 80 150 102 130 140 150 200 200
C 36 38 30 53 53 64 60 64 65
All dimensions in mm & weight in kg
Cathodic Protection Technology Pte Ltd Website: www.cptech.net Tel: +65-6862 3551
E-mail:
[email protected] Fax: +65-6861 6436
CP TECH / WILSON WALTON
MARINE ANODES
Bolted Hull Anode Zinc
Aluminium
Type B2 B3 B4 B4E B6 B8 B9 B9E B9F B9G B12 B12D B12E
A 150 200 200 200 300 300 300 300 300 300 300 300 300
B 75 100 100 100 150 150 150 150 150 150 200 200 200
C 25 20 30 40 20 25 30 40 50 75 40 50 65
D 75 110 110 110 160 160 160 160 160 160 160 160 160
E 14 14 14 14 26 26 26 26 26 26 26 26 26
F 33 38 38 38 50 50 50 50 50 50 50 50 50
Gross Wt 1.5 2.5 3.6 4.2 5.9 7.3 8.3 11.0 13.8 22.0 15.2 18.8 26.8
Gross Wt 0.7 1.1 1.5 1.8 2.7 2.9 3.3 4.6 5.5 8.0 6.0 7.4 10.7
B18
800
75
50
400
26
50
15.8
6.3
Aluminium Tank Anode Type W110 W151 W152 W153 W154 W155 W156 W191 W192 W193 W194 W195 W196
A 1225 1985 1730 1475 1225 1070 765 1985 1720 1465 1210 1060 765
B 765 1525 1270 1015 765 610 305 1525 1260 1005 750 600 305
C 50 75 75 75 75 75 75 95 95 95 95 95 95
D 40 50 50 50 50 50 50 75 75 75 75 75 75
E 50 65 65 65 65 65 65 85 85 85 85 85 85
F 14 14 14 14 14 14 14 14 14 14 14 14 14
Gross Wt 5.4 19.3 16.3 13.1 10.0 8.1 3.8 32.9 27.2 21.7 16.3 13.2 6.3
C 57 69 79 57 69 79 91
D 64 77 83 64 77 83 94
E 14 14 14 14 14 14 14
F 19 23 25 19 23 25 32
Gross Wt 11.3 15.9 21.1 22.6 31.8 42.2 53.8
Zinc Tank Anode Type WT25Z WT35Z WT45Z WT50Z WT70Z WT90Z WT110Z
A 1066 1066 1066 1676 1676 1676 1676
B 610 610 610 1220 1220 1220 1220
Pit-Guard Tank Anode Type AT 2235 AT 2235/1 AT 2235/2 AT 2237 ZT 2247 ZT 2252
Material Aluminium Aluminium Aluminium Aluminium Zinc Zinc
A 200 400 356 395 332 342
B 70 70 70 76 70 76
C 76 76 76 63 76 63
Nett Wt 2.3 4.7 4.2 4.5 10.0 10.0
All dimensions in mm & weight in kg
