Materials Performance

DEC 2014

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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58 DECEMBER 2014 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 53, NO. 12 Continued from The MP Blog, p. 13. The following items relate to chemical treatment. Please be advised that the items are not peer-reviewed, and opinions and suggestions are entirely those of the in- quirers and respondents. NACE Interna- tional does not guarantee the accuracy of the technical solutions discussed. MP welcomes additional responses to these items. They may be edited for clarity. BLOG Corrosion inhibition in subsea pipelines Q: I am interested in experience with corrosion inhibitors in sub sea pipelines, particularly tiebacks. A subsea tieback is typically a f lowline that ties directly from a well into a subsea man ifold (i.e., there are no topside facilities available to dehydrate the product). Most of the f lowlines will be required to operate for at least a 20year design life and have high corrosion rates, which dictate the use of clad pipe. However, future f lowlines may be installed and operated for only five to 10 years. Carbon steel (CS) could be suit able for these f lowlines, but would require a corrosion inhibitor. At this stage, the client hasn't pro vided suff icient data to be able to give a full appraisal of the system, but the f low is likely to be stratif ied. Consequently, I am interested in vapor phase corrosion inhibitors, which I have seen referenced in work by others, although no one has given these products any credence. I've been involved with many projects pre dicting corrosion rates of CS assuming an effectiveness of inhibitor eff iciency. How ever, since I don't work for an operator, I never hear whether the inhibitors actu ally did their job properly during the de sign life of the system. I'd be interested in hearing of any problems with corrosion inhibitors in service, especially in tiebacks. Additionally, I'd be interested in any experience, good or bad, with the use of gas phase corrosion inhibitors. Do they work for stratif ied f low conditions? A: In the case of stratifed fow, the inhibitor has to make it to the water phase. Tere are many well documented cases where the inhibitor Attention Authors New Starting January 2015 corrosionjournal.org • No Manuscript Page Charges • Flat Fee for Color in Print ($1,500 USD) • Flat Fee for Open Access ($1,500 USD) CORROSION is the industry's premier research journal featuring the latest progresses in the science and technology of corrosion control. The world's top corrosion researchers present original, peer-reviewed articles, critical reviews, special topics, and research topical symposium papers. Join the prestigious authors and top researchers receiving worldwide recognition by publishing their research in CORROSION – submit your paper today!

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