{"operation":"document","citation":"21-0033","title":"Hunter Aviation International, Inc. — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2021-06-17","effective_on":null,"summary":"21-0033 response to Hunter Aviation International, Inc. concerning 173.115.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-21-0033.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-21-0033.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-21-0033","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/75246/210033.pdf","body":"<<<PAGE 1>>>\n\nU.S. Department\nof Transportation\nPipeline and Hazardous\nMaterials Safety\nAdministration\n1200 New Jersey Avenue, SE\nWashington, DC 20590\nJune 17, 2021\nMr. John Lusa\nHunter Aviation International, Inc.\n2915 Ogletown Road\nNewark, DE 19713\nReference No. 21-0033\nDear Mr. Lusa:\nThis letter is in response to your March 12, 2021, letter requesting clarification of the Hazardous\nMaterials Regulations (HMR; 49 CFR Parts 171-180) applicable to cylinders containing a\nDivision 2.2 material. Specifically, you ask whether the HMR is applicable to cylinders\ncontaining “UN1072, Oxygen, compressed, 2.2” charged to a pressure less than 200 kPa (29.0\npsig/43.8 psia) at 20 °C.\nAs provided in § 173.115(b), the HMR defines a Division 2.2 gas—which includes oxidizing\ngases—as a material (or mixture) which exerts in the packaging a gauge pressure of 200 kPa\n(29.0 psig/43.8 psia) or greater at 20 °C (68 °F), is a liquefied gas or a cryogenic liquid, and does\nnot meet the definition of a Division 2.1 (flammable gas) or 2.3 (gas poisonous by inhalation)\nmaterial. Therefore, provided the compressed oxygen in the cylinders exert a gauge pressure of\nless than 200 kPa (29.0 psig/43.8 psia) in the packaging and does not meet the definition of a\nDivision 2.1 or 2.3 material, they are not subject to the HMR.\nI hope this information is helpful. Please contact us if we can be of further assistance.\nSincerely,\nT. Glenn Foster\nChief, Regulatory Review and Reinvention Branch\nStandards and Rulemaking Division\n\n<<<PAGE 2>>>\n\nHUNTER AVIATION INTERNATIONAL, INC\nWolcott\n2915 OGLETOWN ROAD\nNEWARK, DE 19713 U.S.A.\n21-0033\n(418) 875-5111 (418) 875-2999 FAX\nDUNS# 020857222\nFriday, March 12, 2021\nMr. Shane Kelley\nDirector, Standards and Rulemaking Division\nU.S. DOT/PHMSA (PHH-10)\n1200 New Jersey Avenue, SE East Building, 2nd Floor\nWashington, DC 20590\nDear Mr. Kelley\nWe operate a fleet of 1950's era Hawker Hunter Fighter jets. The pilot's oxygen cylinders in our\njets were manufactured to British MOD standard 647 and are maintained according to an FAA\napproved inspection program.\nIn some instances, it would be preferrable to ship these cylinders with slight residual pressure (<\n200 kPA) to avoid possible corrosion or contamination. Does the HMR apply to the transportation\nof a Division 2.2 and 5.1 gas having a pressure in a container below 200 kPa (29.0 psig/43.8 psia)?\nIn the DOT response 09-0264 it states: \"PHMSA revised the definition in § 173.115(b)(1) for a\nDivision 2.2 gas in final rules issued on January 14,2009 and January 4, 2010. Section 173.115(b)\nstates a Division 2.2 gas is a nonflammable, non-poisonous compressed gas that includes\ncompressed gas, liquefied gas, pressurized cryogenic gas, compressed gas in solution, asphyxiant\ngas, and oxidizing gas. Therefore, as amended, a Division 2.2 gas, including one with an oxidizer\nsubsidiary hazard, is one that exerts a gauge pressure on a packaging of at least 200 kPa at 20°C\n(68 OF). In accordance with the revised definition, after January 1, 2010, a cylinder of oxygen gas\nthat exerts a gauge pressure less than 200 kPa at 20°C is not subject to the HMR. \"\nDoes the above hold true today? Can we ship our pilot oxygen cylinders as not subject to the HMR\nwhen at a pressure below 200kPA?\nSincerely,\nJohn Lusa\nGeneral Manager\nEncl: 09-0264\nPage 1 of 1","truncated":false,"body_characters":3326}