49 CFR 173.301a - Additional general requirements for shipment of specification cylinders.

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§ 173.301a Additional general requirements for shipment of specification cylinders.
(a) General. The requirements in this section are in addition to the requirements in § 173.301 and apply to the shipment of gases in specification cylinders.
(b) Authorized cylinders not marked with a service pressure. For authorized cylinders not marked with a service pressure, the service pressure is designated as follows:
Specification marking Service Pressure psig
3 1800
3E 1800
8 250
(c) Cylinder pressure at 21 °C (70 °F). The pressure in a cylinder at 21 °C (70 °F) may not exceed the service pressure for which the cylinder is marked or designated, except as provided in § 173.302a(b). For certain liquefied gases, the pressure at 21 °C (70 °F) must be lower than the marked service pressure to avoid having a pressure at a temperature of 55 °C (131 °F) that is greater than permitted.
(d) Cylinder pressure at 55 °C (131 °F). The pressure in a cylinder at 55 °C (131 °F) may not exceed 5/4 times the service pressure, except:
(1) For a cylinder filled with acetylene, liquefied nitrous oxide, or carbon dioxide.
(2) For a cylinder filled in accordance with § 173.302a(b), the pressure in the cylinder at 55 °C (131 °F) may not exceed 5/4 times the filling pressure.
(3) The pressure at 55 °C (131 °F) of Hazard Zone A and Hazard Zone B materials may not exceed the service pressure of the cylinder. Sufficient outage must be provided so that the cylinder will not be liquid full at 55 °C (131 °F).
(e) Grandfather clause. A cylinder in domestic use prior to the date on which the specification for the cylinder was first made effective may be used if the cylinder has been properly tested and otherwise conforms to the requirements applicable to the gas with which it is charged.
[67 FR 51645, Aug. 8, 2002, as amended at 67 FR 61289, Sept. 30, 2002; 68 FR 24661, May 8, 2003; 76 FR 56317, Sept. 13, 2011]

Title 49 published on 2013-10-01

The following are only the Rules published in the Federal Register after the published date of Title 49.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-03-18; vol. 79 # 52 - Tuesday, March 18, 2014
    1. 79 FR 15033 - Hazardous Materials: Adoption of Certain Special Permits and Competent Authorities Into Regulations
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Pipeline and Hazardous Materials Safety Administration
      Final rule.
      This regulation is effective April 17, 2014. The incorporation by reference of certain publications listed in the rule is approved by the Director of the Federal Register as of April 17, 2014.
      49 CFR Parts 107, 171, 172, 173, 175 and 178

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United States Code

Title 49 published on 2013-10-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 49 CFR 173 after this date.

  • 2014-03-18; vol. 79 # 52 - Tuesday, March 18, 2014
    1. 79 FR 15033 - Hazardous Materials: Adoption of Certain Special Permits and Competent Authorities Into Regulations
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Pipeline and Hazardous Materials Safety Administration
      Final rule.
      This regulation is effective April 17, 2014. The incorporation by reference of certain publications listed in the rule is approved by the Director of the Federal Register as of April 17, 2014.
      49 CFR Parts 107, 171, 172, 173, 175 and 178