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ABS - 289

GUIDANCE NOTES ON CATHODIC PROTECTION OF SHIPS

active, Most Current
Organization: ABS
Publication Date: 1 December 2017
Status: active
Page Count: 57
scope:

These Guidance Notes define the best practices and design recommendations for a ship's corrosion protection using cathodic protection (CP) systems and provide guidelines for ship CP design, installation, and maintenance.

Protective coatings are the most efficient way to protect ship steel structures from corrosion. However, cathodic protection, often in conjunction with protective coatings, is also used to protect immersed parts of bare steel surfaces (including coating damaged areas) from corrosion. This includes the external hull surface and the internal surfaces of tanks, such as ballast tanks. It is a common practice for a ship to have cathodic protection systems installed during its new construction.

External underwater surfaces include the underwater hull and all attachments and openings such as shafts, rudder, stabilizers, propeller, propeller bracket, sea chests, water intakes (up to the first valve), and scoops thruster).

The internal surfaces of various tanks include those of ballast water tanks, fresh water tanks, fuel storage tanks, crude oil tanks, bilges, etc. Pipes, such as condensers and heat exchangers, should also be protected cathodically.

Cathodic protection (CP) can be Impressed Current Cathodic Protection, Galvanic Anode Cathodic Protection or a combination of both. Cathodic protection controls corrosion by supplying direct current to the immersed surface of the structure, thus making the structure a cathode of a cell. The external hull of a ship is exposed to different waters with differing chemistries, which have a profound influence on the current distribution from the cathodic protection system. Thus, these Guidance Notes cover ships' cathodic protection only.

Document History

289
December 1, 2017
GUIDANCE NOTES ON CATHODIC PROTECTION OF SHIPS
These Guidance Notes define the best practices and design recommendations for a ship’s corrosion protection using cathodic protection (CP) systems and provide guidelines for ship CP design,...

References

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