{"operation":"document","citation":"PI-82-0110","title":"Pipeline Safety Interpretation PI-82-0110","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1982-11-18","effective_on":null,"summary":"PI-82-0110 concerning 195.106.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-82-0110.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-82-0110.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-82-0110","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1982/g82-11-18_Blackmon_195.106-DBx.pdf","body":"<<<PAGE 1>>>\n\nPI-82-0110\nNovember 18, 1982\nMr. B.H. Blackmon\nPresident, Cook Inlet Pipe Line Company\nP.O. Box 900\nDallas, TX 75221\nDear Mr. Blackmon:\nYour letter dated October 25, 1982, concerned the maximum operating pressure for a segment of the Cook\nInlet pipeline system and asked whether a reduction in operating pressure is an acceptable remedy for\ncorrosion pitting. You referred to an interpretation of §§195.416(f) and (g) given to Williams Pipe Line\nCompany on August 16, 1982, and asked whether your understanding of that interpretation is correct.\nThe referenced interpretation says in rather lead-footed terms that a reduction in operating pressure,\ncommensurate with the remaining pipe thickness, is an acceptable remedy for general corrosion under\n§195.416(f) as well as isolated corrosion pitting under §195.416(g).\nYour understanding of that interpretation is correct as given in your letter. Please be advised, however, that\nmaximum operating pressure is limited by all of the requirements of §195.406.\nSincerely,\nOriginal signed by Richard L. Beam\nRichard L. Beam\nAssociate Director for\nPipeline Safety Regulation\nMaterials Transportation Bureau\n\n<<<PAGE 2>>>\n\nOctober 25, 1982\nCOOK INLET PIPE LINE COMPANY\nP. O. BOX 900\nDALLAS, TEXAS 75221\nMr. Richard L. Beam\nAssociate Director for Pipeline Safety Regulation\nMaterials Transportation Bureau\nU.S. Department of Transportation\n400 Seventh Street, S.W.\nWashington, D.C. 20590\nDear Mr. Beam:\nWe would like to establish an understanding relative to the repair of the Cook Inlet pipeline system, which was\ndiscussed by our representative, Mr. Dale Wilson, at the API-DOT meeting on September 8.\nA 20-mile segment of the Cook Inlet pipeline system was surveyed for corrosion pitting this summer and no\ncorrosion indications more severe than \"moderate\" (30% to 50% wall loss) were disclosed. The maximum\noperating pressure of this system based on 20\" O.D., .250\" WT, Grade X52 has been established at 936 psi. It is\nour understanding that the DOT's August 16, 1982 Pipeline Safety Regulatory Interpretation granted to\nWilliams Brothers will allow us to reestablish the maximum operating pressure at 468 psi for this pipeline\nsegment. This is based on using the remaining wall thickness at the bottom of a moderate pit of maximum\ndepth in the pressure formula of Section 195.106 (liquid regulations).\nPlease let us know if our understanding is correct.\nYours very truly,\nB. H. Blackmon\nPresident","truncated":false,"body_characters":2457}