{"operation":"document","citation":"03-0093","title":"Riddick Engineering Corporation — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2003-06-13","effective_on":null,"summary":"03-0093 response to Riddick Engineering Corporation concerning 178.347.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-03-0093.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-03-0093.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-03-0093","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2003/030093.pdf","body":"<<<PAGE 1>>>\n\nJ.S. Department\nof Transportation\n400 Seventh St., S.W.\nWashington, D.C. 20590\nJUN 13 2003\nMr. Chris J. Teas, PE\nRiddick Engineering Corporation\nConsultants\nRef. No.: 03-0093\n2300 Cottondale Drive\nSuite 200\nLittle Rock, Arkansas 72202\nDear Mr. Teas:\nThis responds to your letter regarding requirements for an internal self-closing stop valve on a DOT\n407 cargo tank under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180).\nSpecifically, you asked whether a \"swing check valve\" as shown in the enclosed diagram would be\nacceptable to meet the \"internal self-closing stop valve\" provisions in §178.345-11(b).\nEach specification DOT 407 cargo tank must conform to the general design and construction\nrequirements in §178.345 in addition to the specific provisions contained in §178.347. Each cargo\ntank (e.g., DOT 407) loading/unloading outlet must be equipped with an internal self-closing stop valve\not with an external self-closing stop valve located as close as practicable to the cargo tank wall.\nAn internal self-closing stop valve is a self-closing stop valve designed so that the self-stored energy\nsource is located inside the cargo tank oi cargo tank sump, or within the welded flange, and the valve\nseat is located within the cargo tank or within one inch of the external face of the welded flange or sump\nof the cargo tank. The regulations do not prohibit a design of the type, such as the \"swing check\nvalve,\" shown in the enclosed diagram if it meets all of the requirements for an \"internal self-closing stop\nvalve,\" specified in §178.345-11(b). You did not provide sufficient information in your letter or a\ndetailed drawing of the components of the \"swing check valve\" for us to determine if it complies with\nthe requirements in §178.345-11(b).\nIf we can be of further assistance, please contact us.\nSincerely,\nDelmer F. Billlings\nChief, Standards Division\nOffice of Hazardous Materials Standards\n030093\n176.347\n\n<<<PAGE 2>>>\n\na: Edward Mazzullo\nFrom: Chris J. Teas\n3/28/2003 14:07:09 (Page 2 of 2)\nRIDDICK ENGINEERING CORPORATION\n4600 WEST MARKHAM\nConsultants\nLITTLE ROCK, ARKANSAS 72205\nEngrum\nFAX 501-374-3700\n501-000-7300\n3178.347-11 (b)\nCargo Tank\nEDGAR K. RIDDICK UR, PE\n1923-1997\nFOUNDER\nMarch 28, 2003\n03-0093.\nMr. Edward Mazzulto\nDirector, Office of HAZMAT Standards\nUSDOT/RSPA (DHM-10)\nCHRIS J: TEAS, PE\nVICE PRESIDENT\n400 7* Street Southwest\nWashington DC, 20590-0001\nRe: Formal interpretation request\nPart 178.347-11 (b) Tank outlets.\nCode Needing Interpretation: Title 49, SUBTITLE B, CHAPTER 1, SUBCHAPTER C,\nCargo Tank Description: Cargo tank to be designed and manufactured is as follows:\n2. 1500 gallon, stainless steel\nDOT 407 vacuum cargo tank vehicle.\n3.\nUsed to clean up various hazardous spills.\n5. Besides this interpretation, all other regulation requirements are in direct compliance.\nCustomer: US Government.\nQuestions:\n1. This section states, \"Each cargo tank loading/unloading outlet must be equipped with\nin internal self-closing stop-valve...\". By definition from section §178.345-1 (c)\nprofessional opinion that a swing check valve (as shown below) will meet the intent of\nis type valve must be shut by self stored energy within the tank. Therefore, it is m\n-SWING CHECK VALVE\nVACUUM\nSHEAR SECTION\n-BALL VALVE\n-DUST CAP\nSincerely,\nChris J. Teas, PE, DOT CT10023\nMechanical\nElectrical\nIndustrial Structural Powor & Procoss Energy Analysis & Computer Modeling\nIndustrial Studies & Masterplanning\nENGINEERS SCIENTIFIC CONSULTANTS\nCo-generation","truncated":false,"body_characters":3513}