{"operation":"document","citation":"15-0136","title":"Mr. Edwin Van Schoick — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2016-03-29","effective_on":null,"summary":"15-0136 concerning 177.848.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-15-0136.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-15-0136.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-15-0136","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2016/150136.pdf","body":"<<<PAGE 1>>>\n\nof Transportation\nU.S. Department\nWashington, D.C. 20590\n1200 New Jersey Avenue, SE\nPipeline and Hazardous\nAdministration\nMaterials Safety\nMAR 2 9 2016\nMr. Edwin Van Schoick\n18213 Bittern Avenue\nLutz, FL 33558\nReference No. 15-0136\nDear Mr. Van Schoick:\nThis is in response to your recent letter requesting clarification of the Hazardous Materials\nRegulations (HMR; 49 CFR Parts 171-180) applicable to transporting five Division 2.3\n(poisonous) gases and one Division 2.2 (non-flammable) gas, all with subsidiary hazards. We\nhave listed the gases you described in the table below. Specifically, you ask if these gases are\nsegregated in the manner prescribed in § 177.848(e)(6) may they be transported on the same\nvehicle. We have paraphrased your questions and answered them in the order you provided.\nNo.\nID No.\nHazardous Material\nPrimary\nHazard\nSubsidiary\n| Hazard\nHazard\nZone\n2\nUN 2188\n3\nUN 2199\nArsine\n2.3\n2.1\n2.3\n2.1\nA\nUN 1953\nPhosphine\n4\n5\nUN 2418\nSulfur tetrafluoride\nCompressed gas, toxic, flammable, n.o.s.\n2.3\n2.3\n2.1\nC\n8\nUN 2190\n2.3\n2.2\n5.1, 8\nA\nUN 1070\nOxygen difluoride, compressed\n5.1\nA\nNitrous oxide\nNone\nQ1.\nDo my Division 2.3 hazardous materials that have a Class 8 (corrosive) subsidiary\nhazard need to be segregated from other Division 2.3 hazardous materials when the\nClass 8 material is not in a liquid state since the segregation table in § 177.848\nrequires that Division 2.3 materials must be segregated from \"8 liquids only\"?\nAl. The answer is no. Division 2.3 hazardous materials with a Class 8 subsidiary hazard\nare not subject to the segregation requirements prescribed in § 177.848 for\ntransportation in commerce by motor vehicle when no corrosive liquid is present. In\naddition, § 177.848(e)(6) waives the segregation requirements for subsidiary\n\"secondary\" hazards in hazardous materials with the same primary hazard class\nprovided these materials will not react dangerously with each other.\nQ2.\nBy segregating in a motor vehicle the materials meeting the Division 2.1 (flammable\ngas) subsidiary hazard class from the materials meeting the Division 5.1 (oxidizer)\nsubsidiary hazard class, in my opinion a dangerous reaction between them would be\neliminated by virtue of the fact that if there were simultaneous leaking containers of\n\n<<<PAGE 2>>>\n\nthese materials, both gases would be sufficiently diluted in concentration by the air\nin the transport vehicle. The hazard of a dangerous reaction is posed by the air in the\ntransport vehicle in the event of a leaking Division 2.1 subsidiary hazard\nmaterial. Can these materials be transported on the same transport vehicle if\nproperly segregated?\nA2.\nThe segregation requirements in § 177.848(d) and (e) permit Division 2.1 materials\nto be placed in the same motor vehicle with Division 5.1 materials, but prohibit\nDivision 2.3, Zone A, materials from being placed in the same motor vehicle with\nDivision S.1 materials. However, § 177.848(e)(6) provides segregation reliet by\npermitting materials with the same primary hazard regardless of their subsidiary\nhazards to be placed on the same motor vehicle provided they are not capable of\nreacting dangerously with each other and causing combustion or dangerous\nevolution of heat, evolution of flammable, poisonous, or asphyxiant gases, or\nformation of corrosive or unstable materials.\nI hope this satisfies your request.\nSincerely,\nTaken Faster\nT. Glenn Foster\nChief, Regulatory Review and Reinvention Branch\nStandards and Rulemaking Division\n2\n\n<<<PAGE 3>>>\n\nEdmonson\n§177.848(eXt)\nsegregation\n15-0136\nU.S. DOT\nJune 24, 2015\nPHMSA: Office of Hazardous Materials Standards\nAttn: PHH-10.\nEast Building\n1200 New Jersey Ave., SE.\nWashington, DC 20590-0001\nRequest for interpretation of 49CFR177.848(e)(6):\nCan the following hazardous materials be transported on the same transport vehicle:\nHazardous\nID No.\nPrimary\nZone\nSubsidiary\nMaterial\nHazard\nHazard\nArsine\nUN2188\nA\n2.1\nPhosphine\nUN2199\n2.3\nA\n2.1\nCompressed gas,\nUN1953\n2.3\n2.1\ntoxic, flammable,\nn.o.s., IHZ C\nSulfur tetrafluoride\nUN2418\n2.3\nA\n8\nOxygen difluoride,\nUN2190\n2.3\nA\n5:1/8\nCompressed\nNitrous oxide\nUN1070\n2.2\nnone\n5.1\nSince all of the above materials are gases in hazard class 2, then if they meet the standard in\n49CFR177.848(e)(6) they would be able to be transported on the same transport vehicle.\nQuestions:\n1. Given that neither of the materials with a subsidiary hazard of class 8 are liquids, is it\nnecessary that they be segregated?\n2. By segregating the materials with the division 2.1 subsidiary hazard from the materials\nwith the division 5.1 subsidiary hazard a dangerous reaction between them is eliminated\nby virtue of the fact that if there were simultaneous leaking containers of these\nmaterials, both of them would be diluted in concentration by the air in the transport\nvehicle. The hazard of a dangerous reaction is posed by the air in the transport vehicle in\nthe event of a leaking division 2.1 subsidiary hazard material.\nCan these materials be transported on the same transport vehicle if properly\nsegregated?\nThank you for your guidance in this matter.\nEdwin Van Schoick\n18213 Bittern Ave.:\nLutz, FL. 33558\n(713)817-8033 daytime phone no.","truncated":false,"body_characters":5166}