{"operation":"document","citation":"PI-75-012","title":"San Diego Gas & Electric Company — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1975-03-21","effective_on":null,"summary":"PI-75-012 response to San Diego Gas & Electric Company concerning 192.123, 192.375.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-75-012.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-75-012.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-75-012","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1975/PI75012.pdf","body":"<<<PAGE 1>>>\n\nMr. Paul L. Hathaway\nVice President - Gas\nSan Diego Gas & Electric Company\nP. O. Box 1831\nSan Diego, Ca 92112\nDear Mr. Hathaway:\nReferring to your letter of February 21, 1975, and figures attached thereto, the redesigned riser\nshown in Figure 2 with a protective sleeve covering all plastic materials aboveground appears to\nmeet the requirements of 49 CFR 192.375(a) for protection of plastic service lines. Although we\ndo not have enough information to opine whether the riser shown in Figure 2 would meet all the\nrequirements of 49 CFR 192.123, we have particular misgivings about its meeting the temperature\nlimitations of section 192.123(b) under ordinary aboveground operating conditions.\nThe two 4-inch PVC lines which are shown in Figure 3 are mains. This is so because in\naccordance with the definition of the term \"main\" in 49 CFR 192.3 each 4-inch line serves as a\ncommon source of supply for more than one service line.\nWe trust this adequately responds to your inquiry.\nSincerely,\nJoseph C. Caldwell\nDirector\nOffice of Pipeline Safety\nMr. Joseph C. Caldwell, Director\nOffice of Pipeline Safety\nDB\nC:\\WP51\\INTERPRT\\192\\3\\75-03-21\n1\n\n<<<PAGE 2>>>\n\nWashington, D. C. 20590\nDear Mr. Caldwell:\nThank you for your response to my letter of November 7, 1974, concerning risers used in\nprivately owned (non-utility) gas systems subject to the OPS regulations. Your comments were\nmost helpful; however, we would like additional clarification on two points. Both questions again\nrelate only to privately owned gas distribution on systems subject to the OPS regulations.\n1. You pointed out that when used on a service line, the PVC riser shown in Figure 1\n(attached) would not comply with the OPS regulations since the PVC flange was\nexposed. If the riser was redesigned to extend the protective sleeve beyond the\nPVC flange, as shown in Figure 2 (attached), would the riser then comply with\nparagraphs 192.123 and 192.375(a)?\n2. Figure 3 (attached) shows a master-metered housing project. The gas is metered\nby a utility master meter, and then enters a privately owned distribution system\nsupplying gas to a number of multi-unit apartment buildings.\nThe two 4-inch PVC lines connect to the utility master meter, and extend\nthroughout the development. These 4-inch lines do not connect directly to the\nmulti-unit apartment buildings; gas reaches each building through a smaller\ndiameter pipe which taps into the 4-inch line nearest the building. Figure 3 shows\ntypical 1-1/2 inch PVC pipes supplying individual buildings.\nAs shown in Figure 3, are the two 4-inch lines connecting to the utility master\nmeter \"mains\" or are they \"service lines,\" according to OPS definition of these\nterms?\nThank you for your assistance in resolving these questions.\nYours very truly,\nPaul L. Hathaway\nNOTE: ATTACHED TWO PAGES - DIAGRAMS\nDB\nC:\\WP51\\INTERPRT\\192\\3\\75-03-21\n2","truncated":false,"body_characters":2870}