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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9 NACE INTERNATIONAL: VOL. 53, NO. 12 MATERIALS PERFORMANCE DECEMBER 2014 Continued on page 10 years has been avoided at least four times, on average, which places the direct savings to date at close to $1,000,000 for each tank. Doug Weybright, South Valley Corrosion Consulting, Bakersf ield , California Ed Darrimon , Bay Area Coating Consultants, Inc., Denair, California The following are excerpts f rom the NACE International Corrosion Net work (NCN) and NACE Coatings Net work . These are e-mail-based discussion g roups for corro- sion professionals , with more than 3 ,000 participants . The excerpts are selected for their potential interest to a large number of NACE members . They are edited for clarit y and leng th . Authors are kept anony mous for publication . Please be advised that the items are not peer-reviewed , and opinions and sug gestions are entirely those of the inquirers and respondents . NACE does not g uarantee the accuracy of the techni- cal solutions discussed . MP welcomes additional responses to these items . They may be edited for clarit y. For information on how to subscribe to these f ree list ser vers , click on the "Corrosion Central " link and then "Online Corrosion Communit y List Ser vers" on the NACE Web site: nace .org. Failure on a hydrogen reformer Q: We have hydrogen reformer heaters that have been in service since 1989. The outlet header is made of ASTM B407 UNS NO8810 and the tee is of ASTM B564 UNS NO8810. The feed is natural gas. The design temperature is 1,620 °F (882 °C) and the operating temperature is 1,440 °F (782 °C). Over the last four years, the weld joints of the outlet header pipe to the tee joints (connection from reformer outlet header to waste heat gas exchanger) started developing linear cracks in every shutdown. Recently the same joint of one reformer heater has developed a leak on-stream. On inspection, we found a wide-open crack spreading almost to three quarters of the circumference of the weld of the outlet header pipe to the tee joint. We had the same problem during the last two shutdowns. We have three identical trains of hydrogen units. Each train has one reformer heater and the outlet header pipe to the tee joints of each heater has the same problem in every shutdown. Has anyone experienced this ty pe of problem in the weld of a reformer outlet header pipe to the tee joint? A lso, what

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