[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR173.302b]

[Page 603]
 
                        TITLE 49--TRANSPORTATION
 
   CHAPTER I--PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, 
                      DEPARTMENT OF TRANSPORTATION
 
PART 173_SHIPPERS_GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS--
 
               Subpart G_Gases; Preparation and Packaging
 
Sec.  173.302b  Additional requirements for shipment of non-liquefied 

(permanent) compressed gases in UN pressure receptacles.

    (a) General. A cylinder filled with a non-liquefied gas must be 
offered for transportation in UN pressure receptacles subject to the 
requirements in this section and Sec.  173.302. In addition, the 
requirements in Sec. Sec.  173.301 and 173.301b must be met.
    (b) UN pressure receptacles filling limits. A UN pressure receptacle 
is authorized for the transportation of non-liquefied compressed gases 
as specified in this section. Except where filling limits are 
specifically prescribed in this section, the working pressure of a UN 
pressure receptacle may not exceed \2/3\ of the test pressure of the 
receptacle. Alternatively, the filling limits specified for non-
liquefied gases in Table 1 of P200 of the UN Recommendations (IBR, see 
Sec.  171.7 of this subchapter) are authorized. In no case may the 
internal pressure at 65 [deg]C (149 [deg]F) exceed the test pressure.
    (c) Fluorine, compressed, UN 1045 and Oxygen diflouride, compressed, 
UN 2190. Fluorine, compressed and Oxygen difluoride, compressed must be 
packaged in a UN pressure receptacle with a minimum test pressure of 200 
bar and a maximum working pressure not to exceed 30 bar. A UN pressure 
receptacle made of aluminum alloy is not authorized. The maximum 
quantity of gas authorized in each UN pressure receptacle is 5 kg.
    (d) Diborane and diborane mixtures, UN 1911. Diborane and diborane 
mixtures must be packaged in a UN pressure receptacle with a minimum 
test pressure of 250 bar and a maximum filling ratio dependent on the 
test pressure not to exceed 0.07. Filling should be further limited so 
that if complete decomposition of diborane occurs, the pressure of 
diborane or diborane mixtures will not exceed the working pressure of 
the cylinder. The use of UN tubes and MEGCs is not authorized.
    (e) Carbon monoxide, compressed UN 1016. Carbon monoxide, compressed 
is authorized in UN pressure receptacles. The settled pressure in a 
steel pressure receptacle containing carbon monoxide may not exceed \1/
3\ of the pressure receptacle's test pressure at 65 [deg]C (149 [deg]F) 
except, if the gas is dry and sulfur-free, the settled pressure may not 
exceed \l/2\ of the marked test pressure.

[71 FR 33883, June 12, 2006]