How is a higher alternative MAOP calculated?
49 CFR 192.620(a) describes how to calculate the alternative MAOP based on the higher operating stress levels. Qualifying segments of pipeline use higher design factors to calculate the alternative MAOP. For a segment currently in operation this results in an increase in MAOP. No changes were made in the design factors used for segments within compressor or meter stations or segments underlying certain crossings. PHMSA expects new pipelines operating in accordance with the alternative MAOP Rule to have road/railroad crossings, fabrications, headers, mainline valve assemblies, separators, meter stations and compressor stations designed and operated per design factors in 49 CFR 192.111.
49 CFR 192.620(a) describes how to calculate the alternative MAOP based on the higher operating stress levels. Operators must use higher design factors to calculate the alternative MAOP for qualifying segments of the pipeline. For a segment currently in operation this will result in an increase in MAOP. No changes were made in the design factors used for segments within compressor or meter stations or segments underlying certain crossings. Operators must design road/railroad crossings, fabrications, headers, mainline valve assemblies, separators, meter stations and compressor stations on new pipelines operating under an alternative MAOP in accordance with the design factors in 49 CFR 192.111.
Related Questions
- Does PHMSA expect the operator of an alternative MAOP pipeline to run geometry and high resolution MFL tools at separate time intervals?
- The alternative MAOP Rule requires the use of non-shielding coating. What coatings does PHMSA consider to be non-shielding?
- How is a higher alternative MAOP calculated?
