Wisconsin Administrative Code
Public Service Commission
Chapter PSC 135 - Gas Safety
Subchapter II - Additions to 49 CFR Part 192
Section PSC 135.195 - Protection against accidental overpressuring additions [49 CFR 192.195]
Universal Citation: WI Admin Code ยง PSC 135.195
Current through August 26, 2024
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.
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