{"operation":"document","citation":"02-0140","title":"Carlton W. Hendrix, Jr — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2002-07-01","effective_on":null,"summary":"02-0140 concerning 177.840.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-02-0140.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-02-0140.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-02-0140","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2002/020140.pdf","body":"<<<PAGE 1>>>\n\nof Transportation\nU.S. Department\n400 Sevonth St., S.W.\nSpecial Programs\nResearch and\nWashington, D.C. 20590\nAdministration\nJUL 1 - 2002\nMr. Carlton W. Hendrix, JI.\n230 Ellenwood Drive\nRef No. 02-0140\nCanton, GA 30115-8276\nDear Mr. Hendrix:\nThis is in response to your May 1, 2002 letter requesting interpretation of the Hazardous Materials\nRegulations (HMR; 49 CFR Parts 100-185) applicable to open valves on cargo tanks. Specifically,\nyou question the practice of some transporters of non-flammable, compressed gases leaving a valve,\nlocated between the pump and the cargo tank's hose connection, slightly open on transports with a\ncapacity greater than 3500 water gallons. Per your letter, the purpose of this practice is to allow any\nexcess pressure that builds up in the 2 inch \"wet\" hose to return to the cargo tank through the bypass\nfeature of the internal valve.\nAs provided in § 177.840(g) each liquid discharge valve on a cargo tank motor vehicle, other than an\nengine fuel line valve, must be closed during transportation except during loading and unloading. This\nmeans each discharge valve in a liquid discharge system must be closed during transportation. This\nrequirement does not pertain to any intermediate isolation valves that may be present in a liquid\ndischarge system. The main internal valve and delivery hose end valve must be closed while in\ntransport. You are not required to close any other valves in the system.\nI hope this information is helpful. If we can be of further assistance, do not hesitate to contact us.\nSincerely,\nWhen A lis\nDelmer F. Billings\nChief, Standards Development\nOffice of Hazardous Materials Standards\n\n<<<PAGE 2>>>\n\n•\n•\n:\n230 Ellenwood Drive\nCanton, GA 30115-8276\nFoster\nMay 1, 2002\nMr. Thomas G. Allen\n§177.840 (9)\nSenior Transportation Regulations Specialist\nOffice of Hazardous Materials Standards\nCargo Tanks\nU.S. Department of Transportation\n02-0140\n400 Seventh Street, S. W.\nWashington, D.C. 20590\nDear Sir:\nI have a question concerning the requirements found in 49 CFR 177.840, (g). It states\n\"Each liquid discharge on a cargo tank, other than an engine fuel line valve, must be\nclosed during transportation except during loading and unloading\"\nThere are some transporters of non-flammable, compressed gases that are leaving the\nvalve, located between the pump and the cargo tank's hose connection, slightly open on\ntransports with a capacity greater than 3500 water gallons. The purpose of this is to\nallow any excess pressure that builds up in the 2 inch \"wet\" hose to return to the cargo\ntank through the bypass feature of the internal valve.\nIt is my belief that this practice is contrary to the requirement found in 177.840(g).\nPlease advise if I am correct in my interpretation of the regulations so I can advise my\nclients.\nSincerely,\nCanton W. Hendrix, fo.\nCarlton W. Hendrix. Jr.\n....\n\n<<<PAGE 3>>>\n\n(770) 345-9451\n> ROUTING & REQUEST\nPlease...\n•Read\nTo: —\nFoster\n• Handle\nNew\n~ Approve\nIntrepretation\nAnd...\n•Forward\n-\n02-0140\n• Return\n• Keep or Recycle -\n• Review with Me From:.\nOD\nPost-t 7664 COM 1996\nDate: 5/16/02\n\n<<<PAGE 4>>>\n\n5/22/02\nDel,\ncalla Ma Pendin to\nconfirm that he is sefessing ta\na liquid discharge sore, and not\nan intermediate isolation volve\nHe confirmed chis inquiry pestains\nits a liquid discharge value onlap.\nThanks,\nAlean\n\n<<<PAGE 5>>>\n\nMETRO\n* 238 Ellenwood Drive\n.. W. Hendrix, Jr.\nC: MAY cit\nCanton, GA 30115-8276\nMr. Thomas G. Allen\nSenior Transportation Regulations Specialist\nOffice of Hazardous Materials Standards\n!\nU.S. Department of Transportation\n400 Seventh Street, S.W.\nWashington, D.C. 20590\n20530+0003\n...!","truncated":false,"body_characters":3629}