{"operation":"document","citation":"PI-79-031","title":"Memo: Internal — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1979-08-31","effective_on":null,"summary":"PI-79-031 response to Memo: Internal concerning 192.741.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-79-031.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-79-031.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-79-031","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1979/PI79031.pdf","body":"<<<PAGE 1>>>\n\nInterpretation of §192.741\nAssociate Director for Pipeline Safety Regulation, DMT-30\nChief, Central Region, DNT-14\nIn your memo of June 22, 1979, you ask several questions with regard to a piping schematic.\nFirst, you would like to know at what regulator stations telemetering or recording pressure gages\nare required under §192.741(a).\nSection 192.741(a) provides: \"Each distribution system supplied by more than one district\npressure regulating station must be equipped with telemetering or recording pressure gages to\nindicate the gas pressure in the district.\" As indicated by §192.741(c) the purpose of paragraph\n(a) is to identify any high or low pressure within a distribution system district which would\nindicate unsatisfactory operation of a pressure regulator or auxiliary equipment supplying the\ndistrict with gas. Section 192.741(a) does not require that pressure gages be placed at regulator\nstations; they may be located there or at other places within the district. However, the number\nand location of the telemetering equipment or recording pressure gages must be such that the\nperformance of the regulator(s) and auxiliary equipment is adequately monitored to detect\nunsatisfactory operation.\nSecondly, you asked if it is the intent of §192.741(a) to require telemetering or pressure recording\ndevices only when the entire distribution is supplied by more than one regulator station, or does it\nalso apply to districts within one distribution system. As indicated in answer to the first question,\nthe intent of §192.741(a) is to require operators to monitor the gas pressure in each district of a\ndistribution system if the district is supplied by more than one pressure regulating station.\nThirdly, you asked whether each pressure district within a system is a separate distribution system.\nIn accordance with the intent of §192.741(a) the terms \"distribution system\" and \"district\" refer to\npipelines located downstream from regulator stations used to maintain pressure in the pipelines.\nThese pressure districts may be considered separate distribution systems within a larger more\ncomplex system.\nFinally, you asked if Part 192 requires the installation of overpressure protection at regulator\nstations D, E, F, and G, shown on your schematic, which were installed in the 1950's with MAOP\nbased on §192.619(a)(3). Since the regulator stations D, E, F, and G were installed in the 1950's\nthe overpressure protection requirements of §192.195 would not apply to them unless they have\nbeen replaced, relocated, or otherwise changed within the meaning of §192.13. Since MAOP is\nDB\nC:\\WP51\\INTERPRT\\192\\741\\79-08-31\n1\n\n<<<PAGE 2>>>\n\ngoverned by §192.619(a)(3), they need not have overpressure protection in accordance with\n§192.195, as they would if §192.619(b) or §192.621(b) applied.\nCesar DeLeon\nDB\nC:\\WP51\\INTERPRT\\192\\741\\79-08-31\n2","truncated":false,"body_characters":2865}