(a) Each pressure-relief or pressure-limiting station or group of stations installed in a low pressure distribution system must have enough capacity, and must be set to operate, to ensure that the pressure may not cause the unsafe operation of any connected and properly adjusted gas utilization equipment.
(b) Each pressure-relief or pressure-limiting station or group of stations installed in pipelines other than low pressure distribution systems must have enough capacity, and must be set to operate to limit the pressure according to the following paragraphs:
(1) If the maximum allowable operating pressure is 60 psig (414 kPa) or more, the pressure may not exceed the maximum allowable operating pressure plus 10 percent, or the pressure that produces a hoop stress of 75 percent of SMYS, whichever is lower.
(2) If the maximum allowable operating pressure is 12 psig (83 kPa) or more, but less than 60 psig (414 kPa), the pressure may not exceed the maximum allowable operating pressure plus 6 psig (41.4 kPa).
(3) If the maximum allowable operating pressure is less than 12 psig (83 kPa), the pressure may not exceed the maximum allowable operating pressure plus 50 percent.
(c) When more than one pressure-regulating or compressor station feeds into a pipeline, relief valves or other protective devices must be installed at each station to ensure that the complete failure of the largest capacity regulator or compressor, or any single run of lesser capacity regulators or compressors in that station, will not impose pressures on any part of the pipeline or distribution system in excess of those for which it was designed, or against which it was protected, whichever is lower.
(d) Relief valves or other pressure-limiting devices must be installed at or near each regulator station in a low-pressure distribution system, with a capacity to limit the maximum pressure in the main to two psig (14 kPa).