Section PSC 135.195 - Protection against accidental overpressuring additions [49 CFR 192.195]After 49 CFR 192.195(b)(2), insert:
(3w) Suitable types of protective devices to prevent overpressuring of high-pressure distribution systems include: (i) Spring-loaded relief valves of types meeting the provisions of the ASME Unfired Pressure Vessel Code.(ii) Pilot-loaded back-pressure regulators used as relief valves, so designed that failure of the pilot system or control lines will cause the regulator to open.(iii) Spring loaded diaphragm-type relief valves.(iv) A monitoring regulator installed in series with the primary pressure regulator.(v) A series regulator installed upstream from the primary regulator, and set to continuously limit the pressure on the inlet of the primary regulator in accordance with the provisions of 49 CFR 192.201.(vi) An automatic shut-off device installed in series with the primary pressure regulator, and set to shut off in accordance with the provisions of 49 CFR 192.201. This device shall remain closed until manually reset. It may not be used where it might cause an interruption in service to a large number of customers.(4w) Suitable types of protective devices to prevent overpressuring of low-pressure distribution systems include: (i) A liquid seal relief device that can be set to open accurately and consistently at the desired pressure.(ii) A series regulator, as described in s. PSC 135.195(3w) (v).(iii) An automatic shut-off device, as described in s. PSC 135.195(3w) (vi).(iv) A pilot loaded back-pressure regulator, as described in s. PSC 135.195(3w) (ii).(v) A monitoring regulator, as described in s. PSC 135.195(3w) (iv). (cw) Suitable types of protective devices to prevent overpressuring of gas pressure holders, pipelines and other facilities that might at times be bottle tight include: (1) Spring-loaded relief valves of types meeting the provisions of the ASME Unfired Pressure Vessel Code.(2) Pilot-loaded back-pressure regulators used as relief valves, so designed that failure of the pilot system or control lines will cause the regulator to open.Wis. Admin. Code Public Service Commission PSC 135.195
CR Register, October, 1999, No. 526, eff. 11-1-99; corrections in (4w) (ii) to (v) made under s. 13.93(2m) (b) 7, Stats., Register February 2004, No. 578; correction in (4w) (v) made under s. 13.92(4) (b) 7, Stats., Register February 2011 No. 662.