July 2007


Similar service assessment of aboveground storage tanks

API publishes the 4th Edition of API Standard 653

Lieb, J., Tank Industry Consultants; Mikkola, C., Enbridge Energy Company LP

The American Petroleum Institute (API) has released for publication the 4th Edition of API Standard 653. The 4th Edition contains a new Appendix H that provides guidance for conducting a similar service assessment to establish inspection intervals for aboveground storage tanks for which corrosion rates have not been directly measured. This article discusses the similar service assessment presented in Appendix H. Appendix H is not all inclusive; it is not mandatory and it is not intended to prevent the use of other similar service assessment methods. Concepts of similar service. The concept of "similar service" has existed for a long time. The practice of identifying, comparing, observing

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