{"operation":"document","citation":"PI-71-024","title":"Williams Brothers Engineering Co. — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1971-02-22","effective_on":null,"summary":"PI-71-024 response to Williams Brothers Engineering Co. concerning 192.611.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-71-024.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-71-024.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-71-024","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1971/PI71024.pdf","body":"<<<PAGE 1>>>\n\nMr. Clinton McClure\nSenior Engineer\nWilliams Brothers Engineering Co.\nResource Sciences Center\nTulsa, Oklahoma 74103\nDear Mr. McClure:\nThis is in reply to your letter of December 4, 1970, requesting an interpretation of 49 CFR,\nSection 192.611(a).\nYou state: \"It has been our practice for a number of years, where the crossing is not cased, to\nplace beneath the road or railroad, pipe of greater wall thickness than the line pipe. There may be\na transition pipe of an intermediate wall thickness between the crossing and line pipe in order to\ncomply with welding standards.\nIt has been our practice to test the crossing pipe and the transition pipe with the line pipe and to\ntest it to the same pressure. The test has been 90 percent or more of the SMYS of the line pipe.\nIn most cases this is less than 90 percent SMYS of the crossing pipe and in some cases less than\n90 percent SMYS of the transition pipe.\nThere are a number of locations where it will become necessary to changes out pipe on each side\nof a crossing to comply with the requirements of the new DOT rules and regulations. Will it be\nnecessary to retest the crossing pipe or re-lay new crossing pipe tested to 90 percent of the\nSMYS of the crossing pipe? I have attached example diagrams.\"\nThe answer to your question is that it will be necessary either to test as much of the pipe as was\nnot tested to 90% of SMYS or replace such pipe with the pipe meeting the design and testing\nrequirements of Part 192 for new pipe in the location, or the maximum operating pressure may be\nreduced consistent with the requirements of that Part.\nSecondly, you ask: \"If pipelines designed, constructed and tested in the future become involved\nin class location changes of this nature, will this subsection of the rule and regulations be applied\nliterally to the \"segments\" of pipe varying in wall thickness?\nThe answer to your question is that Section 192.611 will be literally applied to segments of pipe\nsuch as road crossings.\nDB\nC:\\WP51\\INTERPRT\\192\\611\\71-02-22\n1\n\n<<<PAGE 2>>>\n\nIf we can be of further assistance to you, please let us know.\nSincerely,\nJoseph C. Caldwell\nDirector, Acting\nOffice of Pipeline Safety\nDB\nC:\\WP51\\INTERPRT\\192\\611\\71-02-22\n2","truncated":false,"body_characters":2223}