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Pipeline corrosion by salt or seawater

Pipeline corrosion by salt or seawater

(OP)
Hi,
I am working to transport refined oil through pipeline and searching the corrosion caused by the salt or seawater.
Can anyone give me the data for below?
- Mechanism of corrosion by salt or seawater(Feature, Shapes, etc.)
- Case of pipeline corrosion(External, Internal) caused by salt or seawater
Thanks.

RE: Pipeline corrosion by salt or seawater

Look at API RP 571, which addresses mechanisms in detail.

RE: Pipeline corrosion by salt or seawater

Here is a site for technical papers:
https://www.onepetro.org/

Google probably carries a fair few as well.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: Pipeline corrosion by salt or seawater

salts are ionic solids : they have various properties depending on composition

chloride ions may be involved in the salt formula, but I believe chloride ions has little influence on the corrosion of carbon steel, in oposition with austenitic stainless steels that are sensitive to chlorides.

the risk on carbon steel material is most probably due to corrosion by dissolved oxygen

RE: Pipeline corrosion by salt or seawater

sea water is "normal corrosion" - there is oxygen in the water. The ions in the water helps. You protect the pipeline with anodes

RE: Pipeline corrosion by salt or seawater

1% Ni weld fillers are often used, which make the WM cathodic relative to the BM. In salt water (i.e. conductive electrolyte), this tends to protect the WM from preferential weld corrosion. Care must be taken if the water is diluted with fresh water and becomes less conductive, as Ni also increases the metal's intrinsic corrosion rate.

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