{"operation":"document","citation":"PI-74-015","title":"Tennessee Public Service Commission — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1974-03-07","effective_on":null,"summary":"PI-74-015 response to Tennessee Public Service Commission concerning 192.619.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-74-015.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-74-015.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-74-015","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1974/PI74015.pdf","body":"<<<PAGE 1>>>\n\nMr. John Searcy\nEngineering Division\nTennessee Public Service Commission\nCordell Hull Building\nNashville, TN 37219\nDear Mr. Searcy:\nThis responds to your letter of February 21, 1974, concerning uprating requirements for steel\npipelines operated at 100 psig, or more, with hoop stresses less than 30 percent of SMYS. You\nask whether \"the pressure must be increased in the increments required to the desired maximum\nallowable operating pressure times the appropriate factor in the table in 192.619(a)(2)(ii)?\"\nSubject to the requirements of section 192.621, the maximum allowable operating pressure\n(MAOP) for the pipelines to which you refer may not be increased above the lowest pressure\ndetermined in accordance with action 102.619(a). In uprating to a pressure permitted by section\n102.619(a)(2)(ii), a strength test must be performed. The increments prescribed by section\n192.557(c) apply to the increase in pressure between the existing MAOP and the test pressure or\nthe desired MAOP multiplied by the appropriate factor in section 192.619(a)(2)(ii).\nThank you for your interest in pipeline safety.\nSincerely,\ns/Cesar DeLeon\nJoseph C. Caldwell\nDirector\nOffice of Pipeline Safety\nDB\nC:\\WP51\\INTERPRT\\192\\619\\74-03-07\n1\n\n<<<PAGE 2>>>\n\nTENNESSEE PUBLIC SERVICE COMMISSION\nCORDELL HULL BUILDING\nNASHVILLE, TENNESSEE 37219\nFebruary 21, 1974\nMr. Joseph C. Caldwell\nDirector\nOffice of Pipeline Safety\nDepartment of Transportation\n2100 2nd Street, SW\nWashington, D. C. 20590\nDear Mr. Caldwell:\n192.557(c) states that \". . .the increase in maximum allowable operating pressure must be in\nincrements that are equal to 10 p.s.i.g. or 25% of the total pressure increase,. . .\" 192.557 does\nnot refer in particular to test requirements, which may be used as a criteria for determining\nmaximum allowable operating pressure, as does 192.555. 192.553(d) does, however, refer\ngenerally to limitations on maximum allowable operating pressures.\nTherefore, using test pressure as the criteria for determining maximum allowable operating\npressure for steel pipelines operating at 100 p.s.i.g. or more, is it a correct interpretation that to\nuprate, the pressure must be increased in the increments required to the desired maximum\nallowable operating pressure times the appropriate factor in the table in 192.619(a)(2)(ii)?\nSincerely,\nJohn Searcy\nEngineering Division\nDB\nC:\\WP51\\INTERPRT\\192\\619\\74-03-07\n2\n\n<<<PAGE 3>>>\n\nC:WPS IUNTERPRT19261974-03-07","truncated":false,"body_characters":2447}