{"operation":"document","citation":"PI-78-018","title":"LAVALCO Pipeline Products Division — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1978-06-23","effective_on":null,"summary":"PI-78-018 response to LAVALCO Pipeline Products Division concerning 192.149.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-78-018.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-78-018.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-78-018","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1978/PI78018.pdf","body":"<<<PAGE 1>>>\n\nJune 23, 1978\nMr. James H. Thompson, Manager\nLAVALCO Pipeline Products Division\nP.O. Box 5604\nShreveport, Louisiana 71105\nDear Mr. Thompson:\nYour letter of May 12, 1978, and the telephone call to you on June 1, 1978, by Paul Cory of this\noffice raises the following question:\n\"If a weld fitting has been manufactured and marked in accordance with an\nappropriate specification which is listed in 49 CFR Parts 192 and 195, but is found\nto be made of steel with a higher yield strength than the SMYS to which it was\nmanufactured and marked, may the actual higher yield strength be used for the\ndesign instead of the SMYS?\"\nIn response to this question, your attention is called to §192.149, Standard fittings, paragraph (b),\nwhich states in part, \"Each steel butt-welding fitting must have pressure and temperature ratings\nbased on stresses for pipe of the same or equivalent material.\"\nSection 195.118, Fittings, paragraph (c), states \"The fitting must be suitable for the intended\nservice and be at least as strong as the pipe and fittings in the pipeline systems to which it is\nattached.\"\nThe intent of these sections is that fitting strength be no lower than the strength of pipe of the\nsame or equivalent material. In both §192.105, Design formula for steel pipe, and §195.106,\nInternal design pressure, it is required that the pipe design pressure be based upon the specified\nminimum yield strength. Thus, the specified minimum yield strength would be required to be used\nas the basis for determining the design pressure for weld fittings and not the actual measured yield\nstrength.\nSincerely,\nCesar De Leon\nAssociate Director for\nPipeline Safety Regulation\nMaterials Transportation Bureau\ndal\\192\\149\\78-06-23","truncated":false,"body_characters":1727}