January 2019, Vol. 246, No. 1

Features

MAOP Reconfirmation via Hydrotest – Considerations for Success

By Colin Silla, District Manager, Gas Transmission Systems (GTS) For many years, hydrostatic testing of pipelines has been used to ensure fitness for service by ruling out manufacturing and construction related defects. Current federal code requires hydrostatic tests for newly installed natural gas transmission pipelines and is outlined in Subpart J of 49 CFR, Part 192. The testing requirements were modified from ASME B31.8 by the Office of Pipeline Safety/DOT and included into the federal code in 1970 as requirements to establish the Maximum Allowable Operating Pressure (MAOP) of pipelines. The code included a clause allowing operators to continue to operate their pre- 1970 pipelines at t

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