{"operation":"document","citation":"05-0124","title":"U.S. Coast Guard MSO Jacksonville — Hazardous Materials Safety Interpretation","source_type":"guidance","agency":"Pipeline and Hazardous Materials Safety Administration","status":"guidance","official":true,"published_on":"2005-06-29","effective_on":null,"summary":"05-0124 response to U.S. Coast Guard MSO Jacksonville concerning 176.83.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-interpretation-05-0124.json","markdown":"https://regulus.evalyn.ai/document/phmsa-interpretation-05-0124.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-interpretation-05-0124","source_url":"https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2005/050124.pdf","body":"<<<PAGE 1>>>\n\nof Transportation\nU.S. Department\n400 Seventh Street, S.W.\nWashington, D.C. 20590\nPipeline and\nAdministration\nHazardous Materials Safety\nJUN 29 2005\nLt. John Fitzgerald\nRef No.: 05-0124\nU.S. Coast Guard MSO Jacksonville\n7820 Arlington Expressway, Suite 400\nJacksonville, FL 32211\nDear Lt. Fitzgerald:\nThis responds to your May 20, 2005 letter requesting clarification of the Hazardous\nthe vessel segregation requirements specified in § 176.83.\nMaterials Regulations (HMR; 49 CPR Parts 171-180). Specifically, you ask us to clarify\nYou ask us to reconsider an interpretation that was issued on June 1, 1995 to Ker. Prater\nof Cotter & Company as it would apply to acetylene (Division 2.1) and oxygen (Division\n2.2 primary and Division 5.1 subsidiary hazard). In that letter we interpreted the\nregulations in effect as of June 1, 1995. Section 176.83 required Division 2.1 materials to\nbe segregated \"separate from\" materials with oxidizing properties (i.e., oxygen).\nHowever, § 176.83(a)(8) permitted hazardous materials of the same class to be stowed\ntogether without regard to segregation required by the secondary hazard if the materials\nwere not incompatible. The letter authorized propane (Division 2.1) to be stowed.\ntogether with oxygen (Division 2.2 primary and Division 5.1 subsidiary hazard) when\ntransported by vessel because we considered the two materials to be of the same class\n(Class 2), under the HIMR and they were not incompatible.\nSection § 176.83(a)(8) was amended on June 2, 1999 under Docket No. RSPA-93-4185\n(HM-215C). The revised language in § 176.83 currently states that \"..hazardous\nmaterials of the same class may be stowed together without regard to segregation\neact dangerously with each other and cause: (i) combustion and/or evolution o\nequired by secondary hazards (subsidiary risk label(s)), provided the substances do no\nconsiderable heat; (ii) evolution of flammable, toxic or asphyxiant gases; (iii) the\nformation of corrosive substances; or, (iv) the formation of unstable substances.\" For the\npurposes of the general segregation table in § 176.83(b), we now consider Division 2.1\nand Division 2.2 materials to be of different classes, and they are listed as such in the\ntable. This is consistent with the approach in the International Maritime Dangerous\nGoods (IMDG) Code.\n176.83 (a)8)\n050124\n\n<<<PAGE 2>>>\n\nBecause Acetylene (Division 2.1) and Oxygen (Division 2.2) are now considered\nseparate classes for the purposes of § 176.83(b), the subsidiary hazard must be used to\ndetermine the appropriate segregation. Therefore, acetylene must be stowed \"separated\nfrom\" oxygen. This will be clarified in a future rulemaking.\nI hope this information is helpful. Please contact us if you require additional assistance.\nSincerely,\nXina Im,\nJohn A. Gale\nChief, Standards Development\nOffice of Hazardous Materials Standards\n\n<<<PAGE 3>>>\n\nINFOCNTR <PHMSA>\nFrom:\nEichenlaut\nSent:\njfitzgerald@msojax.uscg.mil\nSubject:\nTo:\nINFOCNTR <PHMSA>\nFriday, May 20, 2005 10:31 AM\n5176.83 G) (8)\nInformation Center Comments/Questions\nSegregation\nBelow is the result of your feedback form.\nIt was submitted by\n05-0124\nLT John Fitzgerald (jfitzgerald@msojax.uscg.mil) on Friday, May 20, 2005 at\n10:31:06.\nEmail:\njfitzgerald@msojax.uscg.mil\nName :\nLT John Fitzgerald\nCategory: Interpretations\n(Letters)\nissued by PHMSA\nOrganization: US Coast Guard MSO Jacksonville\nStreet: 7820 Arlington Expressway, Suite 400\nCity: Jacksonville\nState: Florida\nZip Code: 32211\nPhone:\n904-232-2640 sext 140 - Comancer Ronalds\nFax:\n904-232-1014\nComments: IMMEDIATE RESPONSE NEEDED. May 20, 2005\nI need a re-interpretation of Cotter and Company, 1995. The original interpretation\napply this interpretation to the segregation of acetylene and oxygen.\nsegregation of propane and oxygen.\nCurrently, we (USCG) have been requested to\n49CFR176.83 (a) (8)..\nCotter and Company interpretation applies.\n., I do not believe that the requested application of the orginal 1995\nhave military and commercial shipments that wish to apply this standard today.\nPlease provide me with clarification as we","truncated":false,"body_characters":4092}