49 C.F.R. 49 CFR--PART 173
Title 49 - Transportation
Effective Date(s): September 11, 2006 25. In §173.301, paragraphs (a)(10) and (f)(5)(iv) are added; the section heading, paragraph (f)(1), the introductory text to paragraphs (a), (a)(1), (h), (h)(1), and (i), and paragraphs (c), (d), (j), (k) and (l) are revised to read as follows: (a) General qualifications for use of cylinders. Unless otherwise stated, as used in this section, the term “cylinder” includes a UN pressure receptacle. As used in this subpart, filled or charged means an introduction or presence of a hazardous material in a cylinder. A cylinder filled with a Class 2 hazardous material (gas) and offered for transportation must meet the requirements in this section and §§173.301a through 173.305, as applicable. (1) Compressed gases must be in UN pressure receptacles built in accordance with the UN standards or in metal cylinders and containers built in accordance with the DOT and ICC specifications and part 178 of this subchapter in effect at the time of manufacture, and requalified and marked as prescribed in subpart C in part 180 of this subchapter, if applicable. The DOT and ICC specifications authorized for use are as follows: * * * * * (10) Any person who installs a valve into an aluminum cylinder in oxygen service must verify the valve and the cylinder have the same thread type. * * * * * (c) Toxic gases and mixtures. Cylinders containing toxic gases and toxic gas mixtures meeting the criteria of Division 2.3 Hazard Zone A or B must conform to the requirements of §173.40 and CGA S–1.1 and S–7 (IBR; see §171.7 of this subchapter). The CGA S–1.1, 2001 edition should be used for DOT specification cylinders and the CGA S–1.1 2003 edition should be used for UN pressure receptacles (compliance with paragraph 9.1.1.1 of CGA S–1.1 is not required). A DOT 39 cylinder, UN non-refillable cylinder, or a UN composite cylinder certified to ISO–11119–3 may not be used for a toxic gas or toxic gas mixture meeting the criteria for Division 2.3, Hazard Zone A or B. (d) Gases capable of combining chemically. A cylinder may not contain any gas or material capable of combining chemically with the cylinder's contents or with the cylinder's material construction, so as to endanger the cylinder's serviceability. DOT 3AL cylinders made of aluminum alloy 6351–T6 may not be filled and offered for transportation with pyrophoric gases. The use of UN cylinders made of aluminum alloy 6351–T6 is prohibited. * * * * * (f) * * * (1) Except as provided in paragraphs (f)(5), (f)(6), and (l)(2) of this section, a cylinder filled with a gas and offered for transportation must be equipped with one or more pressure relief devices sized and selected as to type, location, and quantity, and tested in accordance with CGA S–1.1 and S–7. The CGA S–1.1, 2001 edition should be used for DOT specification cylinders and the CGA S–1.1 2003 edition should be used for UN pressure receptacles (compliance with paragraph 9.1.1.1 of CGA S–1.1 is not required). The pressure relief device must be capable of preventing rupture of the normally filled cylinder when subjected to a fire test conducted in accordance with CGA C–14 (IBR, see §171.7 of this subchapter), or, in the case of an acetylene cylinder, CGA C–12 (IBR, see §171.7 of this subchapter). * * * * * (5) * * * (iv) A UN pressure receptacle transported in accordance with paragraph (k) or (l) or this section. * * * * * (h) Cylinder valve protection. UN pressure receptacles must meet the valve protection requirements in §173.301b(f). A DOT specification cylinder used to transport a hazardous material must meet the requirements specified in this paragraph (h). (1) The following specification cylinders are not subject to the cylinder valve protection requirements in this paragraph (h): * * * * * (i) Cylinders mounted on motor vehicles or in frames. MEGCs must conform to the requirements in §173.313. DOT specification cylinders mounted on motor vehicles or in frames must conform to the requirements specified in this paragraph (i). Seamless DOT specification cylinders longer than 2 m (6.5 feet) are authorized for transportation only when horizontally mounted on a motor vehicle or in an ISO framework or other framework of equivalent structural integrity. Cylinders may not be transported by rail in container on freight car (COFC) or trailer on flat car (TOFC) service except under conditions approved by the Associate Administrator for Safety, Federal Railroad Administration. The cylinder must be configured as follows: * * * * * (j) Non-specification cylinders in domestic use. Except as provided in paragraphs (k) and (l) of this section, a filled cylinder manufactured to other than a DOT specification or a UN standard in accordance with part 178 of this subchapter, or a DOT exemption or special permit cylinder or a cylinder used as a fire extinguisher in conformance with §173.309(a), may not be transported to, from, or within the United States. (k) Importation of cylinders for discharge within a single port area. A cylinder manufactured to other than a DOT specification or UN standard in accordance with part 178 of this subchapter and certified as being in conformance with the transportation regulations of another country may be authorized, upon written request to and approval by the Associate Administrator, for transportation within a single port area, provided– (1) The cylinder is transported in a closed freight container; (2) The cylinder is certified by the importer to provide a level of safety at least equivalent to that required by the regulations in this subchapter for a comparable DOT specification or UN cylinder; and (3) The cylinder is not refilled for export unless in compliance with paragraph (l) of this section. (l) Filling of cylinders for export. (1) A cylinder not manufactured, inspected, tested and marked in accordance with part 178 of this subchapter, or a cylinder manufactured to other than a UN standard, DOT specification, exemption or special permit, may be filled with a gas in the United States and offered for transportation and transported for export or alternatively, for use on board a vessel, if the following conditions are met: (i) The cylinder has been requalified and marked with the month and year of requalification in accordance with subpart C of part 180 of this subchapter, or has been requalified as authorized by the Associate Administrator; (ii) In addition to other requirements of this subchapter, the maximum filling density, service pressure, and pressure relief device for each cylinder conform to the requirements of this part for the gas involved; and (iii) The bill of lading or other shipping paper identifies the cylinder and includes the following certification: “This cylinder has (These cylinders have) been qualified, as required, and filled in accordance with the DOT requirements for export.” (2) A DOT specification or a UN cylinder manufactured, inspected, tested and marked in accordance with part 178 of this subchapter and otherwise conforms to the requirements of this part for the gas involved, except that the cylinder is not equipped with a pressure relief device may be filled with a gas and offered for transportation and transported for export if the following conditions are met: (i) Each DOT specification cylinder or UN pressure receptacle must be plainly and durably marked “For Export Only” (ii) The shipping paper must carry the following certification: “This cylinder has (These cylinders have) been retested and refilled in accordance with the DOT requirements for export.”; and (iii) The emergency response information provided with the shipment and available from the emergency response telephone contact person must indicate that the pressure receptacles are not fitted with pressure relief devices and provide appropriate guidance for exposure to fire. * * * * *
Amendment from June 12, 2006
49 CFR--PART 173
Amendment(s) published June 12, 2006, in 71 FR 33881
§ 173.301 General requirements for shipment of compressed gases and other hazardous materials in cylinders, UN pressure receptacles and spherical pressure vessels.
