In a natural gas city gas regulator station with two parallel regulators, one primary and one secondary both with backup monitor regulators for overpressure protection, should a bypass be allowed? The station is taking gas from an 800 psig MAOP pipeline, and after regulation down to 60 psig and then after odorization is delivering it to two systems. One has a set of meters for an industrial customer and the second to a stub out for a low pressure polyethylene pipe LP distribution system. There is no relief or high pressure shutdown being proposed on the system so it is strictly relying on the dual regulation to provide overpressure protection. It is my belief that the addition of the bypass should mandate either a front end high pressure shutdown if the back end gets above the MAOP of 60 psig. While it appears the DOT regulations and ASME B31.8 code does not mandate this, it would seem that sound engineering would. Operating with a bypass open would make any overpressure protection by the regulators effectively non-existent. Can I get some discussion on this?
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