{"operation":"document","citation":"PI-81-015","title":"Missouri Public Service Commission — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1981-07-28","effective_on":null,"summary":"PI-81-015 response to Missouri Public Service Commission concerning 192.355.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-81-015.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-81-015.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-81-015","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1981/PI81015.pdf","body":"<<<PAGE 1>>>\n\nJuly 28, 1981\nMr. Dale W. Johansen\nAssistant Director, Gas Department\nEngineering Section\nMissouri Public Service Commission\nP. O. Box 360\nJefferson City, Missouri 65102\nDear Mr. Johansen:\nWe apologize for the lateness of our response to your letter of April 14, 1981, asking whether\n§192.357(d) requires nonrelief type service regulators, which would release gas only upon failure\nto have their breather vents vented to the outside atmosphere.\nAs indicated by the enclosed interpretations (dated October 12, 1973, and November 1, 1976),\n§192.357(d) does not apply to nonrelief type service regulators because they do not release gas\nduring operation. Nevertheless, nonrelief type service regulators that have breather vents are\nsubject to the requirements of §192.355(b)(2) and must be installed so that gas escaping from the\nvents in the events of diaphragm or other failure is released into the outside atmosphere.\nWe trust that this response will satisfy your concerns.\nSincerely,\n/signed/\nMelvin A. Judah\nActing Associate Director for\nPipeline Safety Regulation\nMaterials Transportation Bureau\ndal\\192\\355\\81-07-28\n1\n\n<<<PAGE 2>>>\n\nOctober 12, 1973\nMr. A. C. Singer\nVice President of Operations\nThe Gas Service Company\n700 Scarritt Building\nKansas City, Mo. 64142\nDear Mr. Singer:\nIn your letter of September 24, 1973, you requested an interpretation of Paragraph 192.357(d),\nTitle 49, Code of Federal Regulations, which reads as follows:\n\"Each regulator that might release gas in its operation must be vented to the outside\natmosphere.\"\nYour specific question was whether the above paragraph requires an outside vent on service\nregulators which are installed inside, and which are not equipped with relief facilities. Since they\ndo not release gas in their operation, you have considered such regulators as constituting a closed\nsystem.\nYour interpretation is correct. Since there is no release of gas in the operation of such a service\nregulator, that regulator need not be vented to the outside atmosphere.\nIf we may assist further, please let us know.\nSincerely,\n/signed/\nJoseph C. Caldwell\nDirector\nOffice of Pipeline Safety\ndal\\192\\355\\81-07-28\n2\n\n<<<PAGE 3>>>\n\nNovember 1, 1976\nMr. Leonard M. Coffelt\nMissouri Public Service Commission\nP. O. Box 360\nJefferson City, Missouri 65101\nDear Mr. Coffelt:\nThis responds to your letter dated September 21, 1976, asking that we review a previous\ninterpretation dated October 12, 1973, regarding 49 CFR 192.357(d). You ask whether that\ninterpretation permits \"service regulators to be installed within a building without venting the\ndiaphragm breather vent to the outside atmosphere.\"\nSection 192.357(d) reads:\n\"Each regulator that might release gas in its\noperation must be vented to the outside atmosphere.\"\nThe October 12, 1973, interpretation essentially provides that Section 192.357(d) does not apply\nto a regulator which does not release gas in its operation.\nThat interpretation was not intended to permit installation of a regulator with a diaphragm\nbreather vent inside a building without placing the discharge end of the vent outside the building.\nSections 192.199(e) and 192.355(b)(2) are clear that the outlet of each regulator vent must be\nlocated outside.\nSincerely,\n/signed/\nCesar DeLeon\nActing Director\nOffice of Pipeline\nSafety Operations\ndal\\192\\355\\81-07-28\n3","truncated":false,"body_characters":3345}