{"operation":"document","citation":"PI-72-035","title":"New Hampshire Public Utilities — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1972-08-09","effective_on":null,"summary":"PI-72-035 response to New Hampshire Public Utilities concerning 192.503.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-72-035.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-72-035.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-72-035","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1972/PI72035.pdf","body":"<<<PAGE 1>>>\n\nAugust 9, 1972\nMr. Bruce B. Ellsworth\nGas Safety Engineer\nNew Hampshire Public Utilities\nCommission\n26 Pleasant Street\nConcord, New Hampshire 03301\nDear Mr. Ellsworth:\nThis is in response to your letter dated July 26, 1972, and your telephone conversation with our\nMr. Lance Heverly on August 2, 1972.\nYour letter indicates that there is a situation in your State in which two parallel transmission lines,\none of which is 6\" and the other 10\" are operating at approximately 400 psig. The transmission\ncompany intends to shut down the 6\" line and make permanent field repairs to some corrosion\nleaks that had been repaired with leak clamps in 1968. From your conversation with Mr. Heverly,\nyou agreed that the hoop stress of 7.15 percent of SMYS was in error and that the pipe involved\nis Grade B,.188\" wall thickness, and about 50 feet long. Your letter indicated that the company\nintends to x-ray all welds but questions whether a hydrostatic test is also required.\nIf the operating company plans to pressure test the replacing section of pipe in the operating\npipeline, then the pressure test would have to be made with air or water since the permissible test\npressure in a Class III location using gas, as set forth in Section 192.503(c), falls just short of that\nrequired to comply with Section 192.619(a)(2)(ii). However, gas, air, or water could be used on\nthe fabricated short section of pipe at some other location than in the pipeline, such as covered by\nSection 192.505 for pipe operating above 30 percent of SMYS, and then installed in the pipeline.\nWe trust that this has answered your particular question. If we can be of further service, please\nlet us know.\nSincerely,\n/signed/\nJoseph C. Caldwell\nDirector\nOffice of Pipeline Safety\nDB/dal/192.503\n72-08-09\n1","truncated":false,"body_characters":1785}