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ERW pipe for Sea Water Line

January 19, 2009

Hello,
I am working for a shipyard in Istanbul. We are thinking to use ERW type pipe on the sea water line of one our vessel. We are not sure for the way that protect the pipes from corrosion.
Does anyone have any exact info that what kind of material we should coat inside of the pipes in order to protect the pipes and also data for coating method of the protection material.

Thanks,

Acar Acar
Engineer - Istanbul, Turkey

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January 19, 2009

I suggest you consider using a material that is inherently resistant to corrosion in the application, rather than use a plain carbon steel then try to coat it with some resistant material. Continued maintenance of the coating would be critical to long-term survival of the pipe.

Depending on the service temperature (that is, whether the pipe would be handling sea water at sea temperature, or sea water that has been heated by process on the ship), you could consider 316 or 316L stainless steel for ambient temperature or 2205 stainless for temperature above about 40 degrees C.

Bill Reynolds [deceased]
consultant metallurgist - Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.

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January 21, 2009

Hi Acar,

Bill Reynolds hit it on the head ... try to use some material that is fully corrosion resistant to sea water.

Consider Pe or PVC.... subject to temperatures involved
which you didn't mention.


Cheers from foggy White Rock,

Freeman Newton [deceased]
(It is our sad duty to advise that Freeman passed away
April 21, 2012. R.I.P. old friend).