Monday, January 9, 2012

Review of CP Criteria in Five Standards

Further to the discussion of CP criteria there is a very good article in the Pipeline and Gas Journal (December 2011) that discusses the various industry standards and compares one to the other.

This article is written by Fengmei Song and Hui Yu.  They have done a very good job of providing the infromation as well as providing so very good comments concerning the criteria contained in each.  You can contact Fengmei (Frank) Song at fsong@swri.org for more information.

One of the best quotes I like is "It was found that none of the CP criteria or even their combinations sufficiently guaranteed adequate protection of a pipeline in all field conditions, such as pitting under a shielding coating disbonded from the pipe surface."

This, of course, is what I have been writing about for many years.  As the industry starts using more coatings that are proven to be non-shielding to CP when disbondments occur, there will be less external corrosion and SCC!  I will be presenting a paper at CORROSION 2012 that discusses the use of EMAT technology to find disbonded coatings on pipelines.  See you there!

Richard Norsworthy

No comments: