§ 3a.25. Pressure reducing stations.
(a) The installation of pressure reducing stations must comply with ASME B 31.1.
(b) Hand-controlled bypasses around reducing valves may be used if the bypass has no greater capacity than the reducing valve. Hand controlled bypasses may be used around reducing valves at greater capacity than the reducing valve if the system or unfired pressure vessel has adequate relief or safety valve protection, or meets the requirements of the high pressure system.
(c) A pressure gauge must be installed on the low-pressure side of a reducing station.
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