US PIPELINE REGULATIONS-1: Increasing US natural gas lines’ MAOP requires close study

Increasing the maximum allowable operating pressure of US gas transmission pipelines requires careful consideration and must be done on a case-by-case basis.A higher maximum stress level (as a percent of specified minimum yield strength, or SMYS) for various class locations (increasing the maximum design factor to 0.8 from 0.72), allowing higher design factors in class locations, and waiving traditional pressure testing requirements usually mandated for class-location changes would allow the MAOP of certain US natural gas transmission pipelines to be increased.1 2A higher design factor allows the pipeline operator to increase pressures, improving gas pipeline efficiency through a combinat...

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