[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: 49CFR173.304]

[Page 560]
 
                        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. 173.304  Filling of cylinders with liquefied compressed gases.

    (a) General requirements. Liquefied compressed gases (except gas in 
solution) must be shipped in accordance with the requirements in this 
section and in Secs. 173.301, 173.301a, 173.304a, and 173.305.
    (1) A DOT 3AL cylinder may not be used for any material with a 
primary or subsidiary hazard of Class 8.
    (2) Shipments of Division 2.1 materials in aluminum cylinders are 
authorized only when transported by motor vehicle, rail car, or cargo-
only aircraft.
    (b) Filling limits. Except for carbon dioxide; 1,1-Difluoroethylene 
(R-1132A); nitrous oxide; and vinyl fluoride, inhibited, the liquid 
portion of a liquefied gas may not completely fill the packaging at any 
temperature up to and including 54  deg.C (130  deg.F). The liquid 
portion of vinyl fluoride, inhibited, may completely fill the cylinder 
at 54  deg.C (130  deg.F) provided the pressure at the critical 
temperature does not exceed 1.25 times the service pressure of the 
cylinder.
    (c) Mixture of compressed gas and other material. A mixture of 
compressed gas must be shipped in accordance with Sec. 173.305.
    (d) Refrigerant and dispersant gases. Nontoxic and nonflammable 
refrigerant or dispersant gases must be offered for transportation in 
cylinders prescribed in Sec. 173.304a, or in DOT 2P and 2Q containers 
(Secs. 178.33, 178.33a of this subchapter). DOT 2P and 2Q containers 
must be packaged in a strong wooden or fiberboard box of such design as 
to protect valves from damage or accidental functioning under conditions 
incident to transportation. Pressure in the inside metal containers may 
not exceed 87 psia at 21  deg.C (70  deg.F). Each completed metal 
container filled for shipment must be heated until its contents reach a 
minimum temperature of 54  deg.C (130  deg.F) without evidence of 
leakage, distortion, or other defect. Each outside package must be 
plainly marked ``INSIDE CONTAINERS COMPLY WITH PRESCRIBED 
SPECIFICATIONS''.
    (e) Engine starting fluid. Engine starting fluid containing a 
flammable compressed gas or gases must be shipped in a cylinder as 
prescribed in Sec. 173.304a or as follows:
    (1) Inside non-refillable metal containers having a capacity not 
greater than 500 mL (32 in \3\). The containers must be packaged in 
strong, tight outer packagings. The pressure in the container may not 
exceed 145 psia at 54  deg.C (130  deg.F). If the pressure exceeds 145 
psia at 54  deg.C (130  deg.F), a DOT 2P container must be used. In 
either case, the metal container must be capable of withstanding, 
without bursting, a pressure of 1.5 times the pressure of the contents 
at 54  deg.C (130  deg.F). The liquid content of the material and gas 
may not completely fill the container at 54  deg.C (130  deg.F). Each 
container filled for shipment must have been heated until its contents 
reach a minimum temperature of 54  deg.C (130  deg.F), without evidence 
of leakage, distortion, or other defect. Each outside shipping container 
must be plainly marked, ``INSIDE CONTAINERS COMPLY WITH PRESCRIBED 
SPECIFICATIONS''.
    (2) [Reserved]

[67 FR 51647, Aug. 8, 2002]