Missouri Public Service Commission — Pipeline Safety Interpretation

Page 1November 1, 1976 Mr. Leonard M. Coffelt Missouri Public Service Commission P.O. Box 360 Jefferson City, Missouri 65101 Dear Mr. Coffelt: This responds to your letter dated September 21, 1976, asking that we review a previous interpretation dated October 21, 1973, regarding 49 CFR 192.357(d). You ask whether that interpretation permits "service regulators to be installed within a building without venting the diaphragm breather vent to the outside atmosphere." Section 192.357(d) reads: "Each regulator that might release gas in its operation must be vented to the outside atmosphere." The October 12, 1973, interpretation essentially provides that Section 192.357(d) does not apply to a regulator which does not release gas in its operation. That interpretation was not intended to permit installation of a regulator with a diaphragm breathe vent inside a building without placing the discharge end of the vent outside the building. Sections 192.199(e) and 192.355(b)(2) are clear that the outlet of each regulator vent must be located outside. Sincerely, Cesar DeLeon Acting Director Office of Pipeline Safety Operations dal\192\357\76-11-01#