{"operation":"document","citation":"04-0236","title":"Tom Dunaway & Associates, Inc — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2004-11-16","effective_on":null,"summary":"04-0236 response to Tom Dunaway & Associates, Inc concerning 173.33, 177.848.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-04-0236.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-04-0236.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-04-0236","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2004/040236.pdf","body":"<<<PAGE 1>>>\n\n400 Seventh St., S.W.\nNOV 16 2004\nWashington, D.C. 20590\nSpecial Programs\nResearch and\nAdministration\nMr. Robert Brown, Jr.\nRef. No.: 04-0236\nP.O. Box 712\nTom Dunaway & Associates, Inc.\nAntioch. California 94509\nDear Mr. Brown:\nThis responds to your letter regarding the proper segregation and separation of a Division 5.1\n(oxidizer) and a Class 8 (corrosive) liquid under the Hazardous Materials Regulations (HMR; 49\nCFR Parts 171-180). Specifically, your questions concerns the segregation and separation\nrequirements for hazardous materials identified by the letter \"O\" in § 177.848(e)(3). You state\nthat you have a client who wishes to transport a Class 8 (corrosive) material and a Division 5.1\n(oxidizer) material in a multi-compartmented cargo tank. Your questions are paraphrased and\nanswered as follows:\nQ1. Are these hazardous materials authorized to be transported in adjacent or non-adjacent\ntanks of the same cargo tank?\nAl.\nThe arswer is no. Section 177.848(a)(2) applies to materials that meet one or more\nhazard class definitions and are in a compartment within a multi-compartmented cargo\ntank subject to the restrictions in § 173.33. Section 173.33(a)(2) prohibits the loading of\nexplosion, fire, excessive increase in pressure or heat, or the release of toxic vapors. This\nmaterials on the same cargo tank motor vehicle that, if mixed, could result in an\nrestric ion applies regardless of whether the incompatible materials on the cargo tank\nmotor vehicle are separated by adjacent compartments/tanks or non-adjacent\ncompartments/tanks.\n02.\nIf the answer to Ql is no, would that answer change if the shipper certifies that the\nmixture of the contents would not create a fire or a dangerous evolution of heat or gas?\nA2.\nThe ariswer is yes. Section 173.33(a)(2) is not intended to prevent the shipment of\nmaterials that, if mixed, would produce a moderate exothermic reaction that would not\nstart a fire, rupture the tank, or release acutely toxic vapors.\n193:33 (a) 2)\n177.848 (a)z)\n040236\n\n<<<PAGE 2>>>\n\nMany factors affect how materials may react with each other. They include the chemical\ncomposition and properties of the materials involved, and how they react to air, water,\ncontaminants, or temperature conditions during transportation. Because there are so many\nvariables, under the HMR, the parties involved must evaluate the potential risk posed by different\nmaterials that are offered and accepted for transportation on the same multi-compartmented cargo\ntank motor vehicle. If your client has specific questions on making these determination, your\nclient may contact Mr. Charles Hochman, Office of Hazardous Materials Technology, at (202)\n366-4545 for assistance.\nI hope this satisfies your request.\nSincerely,\nHotte 2. Michels\nHattie L. Mitchell, Chief\nRegulatory Review and Reinvention\nOffice of Hazardous Materials Standards\n\n<<<PAGE 3>>>\n\nBetts\n8177848(0)2)\nTom Dunaway & Associates, Inc.\n§173.33 (a) (8)\nSegregatior36\nJune 29, 2004\nOffice of Hazardous Materials Standards\nResearch and Special Programs Administration\nAttn: DHM-10\nU.S. Department Of Transportation\n400 7\" Street SW\nWashington, DC 20590-001\nClarification 49 CFR 177.848(a)(2)/173.33(a)(2)\nMy questions concern the Segregation Requirements for materials identified by Note \"O\" in\n177.848(e)(3). I have both phone and e-nailed the RSPA Information center. The responses to\nmy inquiry only deal with non-bulk packages.\nA client wishes to transport a Class 8 corrosive\nmaterial and a Division 5.1 oxidizing material in a multi-compartmented cargo tank.\nQ-1 May these materials be transported in adjacent compartments/tanks of the same cargo tank\nmotor vehicle?\nQ-2 If the answer to Q-1 is no, may they be transported in non-adjacent compartments/tanks?\nQ-3 Would the intervening tank need to be empty?\ncertifies that the mixture of the contents would not create a fire or a dangerous evolution of heat\nQ-4 If the answer to Q-1 or Q-2 was No, would there be change to the answer if the shipper\nor gas?\nSincerely\nPhalat\nRobert J. Brown, Ji\nTDA, Inc.\nPO Box 712\nAntioch, California 94509\nPh: (925) 706-0199\nfax: (925) 706-0199","truncated":false,"body_characters":4133}