{"operation":"document","citation":"PI-72-0102","title":"Albert Switzer & Associates, Inc. — Pipeline Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"1972-02-08","effective_on":null,"summary":"PI-72-0102 response to Albert Switzer & Associates, Inc. concerning 192.121.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-72-0102.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-72-0102.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-pi-72-0102","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/Pipeline/1972/g72-02-08_Kidd_192.121-lmxs.pdf","body":"<<<PAGE 1>>>\n\nPI-72-0102\nFebruary 8, 1972\nMr. J. M. Kidd\nAlbert Switzer & Associates, Inc.\nConsulting Engineers\nP.O. Box 14658\nBarton Rouge, Louisiana 70808\nDear Mr. Kidd\nThis letter is in regard to your inquiry to and subsequent discussions with Mr. Marshall Taylor of our Houston field office\nrelative to the use of plastic pipe.\nYou stated that your firm is designing a natural gas distribution system for a predominately rural area (Class Locations 1\n& 2), and supplied design information that shows sizes ranging from 6”to 12” and pressures from 36 to 150 psig.\nIn your letter you state, “The DOT regulations appear to be silent on pressure above 100psig and pipe sizes larger than\n6”\nASTM D2513, Thermoplastic Gas Pressure Pipe, Tubing and Fittings referenced in Section I of Appendix B of 49 CFR, part\n192 includes specifications for thermoplastic pipe. Section 4.1.1.4 of ASTM D2513 references specifications for Poly Vinyl\nChloride (PVC) Plastic pipe (SDR-PR and Class T) with the noted limitations.\nWith regard to your comment on pressures above 100 psig, we refer you to Sections 192.121 and 192.123 which specify\nthe design limitations for the operating pressures of plastic pipe meeting all other requirements of the regulations.\nIf you have further questions, please advise.\nSincerely\nJoseph C. Caldwell\nActing Director\nOffice of Pipeline Safety\n\n<<<PAGE 2>>>\n\nAlbert Switzer & Associates, Inc.\nP.O. Box 14658\n3150 Valley Street\nBaton Rouge, Louisiana 70808\nAugust 24, 1971\nMr. Marshall W. Taylor\nUSDT Office of Pipe Line Safety\n201 Fannin Street - Suite 315\nHouston, Texas\nRe: Plastic Pipe\nASA Job No. 326\nDear Mr. Taylor:\nPlease refer to our conversation this date concerning the use of plastic pipe.\nOur firm is designing a natural gas distribution system for a predominately rural area (Classes 1 and 2). The following is\nthe design information.\nASTM D 2513\nClass 200\nStation Size Miles PSIG PVC – 2 Wall Thick\nA 150\n12” 19.6 0.606”\nB 123\n10” 8.3 0.511”\nC 92\n8” 9.3 0.410”\nD 81\n8” 4.2 0.410”\nE 65\n8” 6.2 0.410”\nF 43\n6” 2.9 0.316”\nG 36\nThe DOT regulations appear to be silent on pressures above 100 psig and pipe sizes larger than 6\".\nWe would appreciate your review of this information and solicit your recommendations.\nYour s truly,\nALBERT SWITZER & ASSOCIATES, INC.\nConsulting Engineers\nJ. M. Kidd, P. E.","truncated":false,"body_characters":2324}