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CP Design for sub sea pipeline with bare welded joints

CP Design for sub sea pipeline with bare welded joints

CP Design for sub sea pipeline with bare welded joints

(OP)
Client does not want to coat welded joints (12-inch width) , but wishes to add extra anode weight and/or reduce spacing based upon higher coating breakdown factor. Is it acceptable practice. I like to know your thoughts.
Which coating breakdown factor should be followed? DNV or ISO?

RE: CP Design for sub sea pipeline with bare welded joints

It is a feasible practice, as can be noted from the text of ISO 15589-2, but it might not be considered as established: see NACE Corrosion 2013, Paper 2258. The coating breakdown factor determination methodology to be applied should be in the client's cathodic protection specification.

Steve Jones
Corrosion Management Consultant

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

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