[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR173.320]

[Page 593]
 
                        TITLE 49--TRANSPORTATION
 
 CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 173--SHIPPERS--GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS--Table of Contents
 
               Subpart G--Gases; Preparation and Packaging
 
Sec. 173.320  Cryogenic liquids; exceptions.

    (a) Atmospheric gases and helium, cryogenic liquids, in Dewar 
flasks, insulated cylinders, insulated portable tanks, insulated cargo 
tanks, and insulated tank cars, designed and constructed so that the 
pressure in such packagings will not exceed 25.3 psig under ambient 
temperature conditions during transportation are not subject to the 
requirements of this subchapter when transported by motor vehicle or 
railcar except as specified in paragraphs (a)(1), (a)(2), and (a)(3) of 
this section.
    (1) Sections 171.15 and 171.16 of this subchapter pertaining to the 
reporting of incidents, not including a release that is the result of 
venting through a pressure control valve, or the neck of the Dewar 
flask.
    (2) Subparts A, B, C, and D of part 172, (Secs. 174.24 for rail and 
177.817 for highway) and in addition, part 172 in its entirety for 
oxygen.
    (3) Subparts A and B of part 173, and Secs. 174.1 and 177.800, 
177.804, and 177.823 of this subchapter.
    (b) The requirements of this subchapter do not apply to atmospheric 
gases and helium:
    (1) During loading and unloading operations (pressure rises may 
exceed 25.3 psig); or
    (2) When used in operation of a process system; such as a 
refrigeration system (pressure may exceed 25.3 psig).
    (c) For transportation aboard aircraft, see the ICAO Technical 
Instructions, Packing Instruction 202 and the packaging specifications 
in part 6, Chapter 5. (See Sec. 171.7 of this subchapter for ICAO 
Technical Instructions.)

[Amdt. 173-201, 52 FR 13043, Apr. 20, 1987, as amended at 62 FR 51561, 
Oct. 1, 1997; 66 FR 33436, June 21, 2001; 67 FR 61014, Sept. 27, 2002]