{"operation":"document","citation":"PI-91-007","title":"PLIDCO — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1991-03-21","effective_on":null,"summary":"PI-91-007 response to PLIDCO concerning 192.713, 192.715.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-91-007.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-91-007.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-91-007","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1991/PI91007.pdf","body":"<<<PAGE 1>>>\n\nMr. W. C. Zanders\nChief Engineer\nPLIDCO\n870 Canterbury Road\nCleveland, OH 44145-1419\nDear Mr. Zanders:\nBy letters of May 21 and October 22, 1990, addressed to Richard Beam, you asked about the\ninstallation of a \"full encirclement welded split sleeve\" under 49 CFR 192,713(a)(2) and\n192.715(c). Please accept my apology for the unusual delay in replying to your letters.\nFirst, you asked whether the sleeve ends and pipe must be joined by circumferential fillet welds.\nSection 192.713(a) governs the repair of certain pipe imperfections or damage discovered in\ntransmission lines operating above 40 percent of SMYS, and §192.715 governs the repair of\ncertain girth weld defects discovered in any transmission line in service. Although both rules\nrequire the installation of a full encirclement welded split sleeve for certain repair situations, the\nrules are silent on whether the installation must include circumferential fillet welds. Such welds\nare required, therefore, only when necessary to accomplish the purpose of the installation.\nIf the imperfection or damage or girth weld defect is not leaking and may not reasonably be\nexpected to leak, the purpose of installing a full encirclement welded split sleeve is to bolster the\nstrength of the pipeline in the vicinity of the imperfection or damage or girth weld defect. This\npurpose can be accomplished without welding the sleeve ends to the pipe; so circumferential fillet\nwelds are not required. However, if the imperfection or damage or girth weld defect is leaking or\nmay reasonably be expected to leak, the purpose of the full encirclement welded split sleeve is not\nonly to bolster the strength of the pipeline, but also to stop the present or possible future leak. In\nthis case, either circumferential fillet welds or other suitable means must be used to permanently\nseal the sleeve ends and contain the pipeline pressure. Circumferential fillet welds would be\nrequired only if the other means available would not accomplish that purpose.\nNext you asked if the two half shells that form the full encirclement welded split sleeve must be\njoined by welding or may they be joined mechanically. Under §§192.713(a)(2) and 192.715(c), in\nthe phrase \"full encirclement welded split sleeve,\" the term \"welded\" modifies the term \"split\nsleeve.\" The meaning of the combined terms is that the two half shells must be joined by welding.\nIn contrast, §192.713(b) expressly allows submerged pipelines to be repaired by mechanically\njoining the two half shells of a full encirclement split sleeve. Note that in §192.713(b) the term\n\"welded\" does not appear in the phrase \"full encirclement split sleeve.\"\nDB\nC:\\WP51\\INTERPRT\\192\\713\\91-03-21\n1\n\n<<<PAGE 2>>>\n\nPlease let me know if we can be of any further assistance in understanding the Part 192\nregulations.\nSincerely,\n/signed/\nGeorge W. Tenley, Jr.\nAssociate Administrator for\nPipeline Safety\nDB\nC:\\WP51\\INTERPRT\\192\\713\\91-03-21\n2","truncated":false,"body_characters":2946}