[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR179.103-3]

[Page 1077-1078]
 
                        TITLE 49--TRANSPORTATION
 
   CHAPTER I--PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, 
                      DEPARTMENT OF TRANSPORTATION
 
PART 179_SPECIFICATIONS FOR TANK CARS--Table of Contents
 
 Subpart C_Specifications for Pressure Tank Car Tanks (Classes DOT-105, 
                         109, 112, 114 and 120)
 
Sec.  179.103-3  Venting, loading and unloading valves, measuring and 
sampling devices.

    (a) Venting, loading and unloading valves, measuring and sampling 
devices, when used, shall be attached to a nozzle or nozzles on the tank 
shell or heads.
    (b) These valves and appurtenances must be grouped in one location 
and, except as provided in Sec.  179.103-5, must be equipped with a 
protective housing with cover, or may be recessed into tank shell with 
cover. An additional set grouped in another location may be provided. 
Protective housing with cover, when used, must have steel sidewalls not 
less than three-fourths inch in thickness and a metal cover not less 
than one-fourth inch in thickness that can be securely closed. 
Underframe sills are an acceptable alternate to the protective housing 
cover, provided the arrangement is of approved design. For fittings 
recessed into tank shell, protective cover must be metal and not less 
than one-fourth inch in thickness.
    (c) When tank car is used to transport liquefied flammable gases, 
the interior pipes of the loading, unloading, and sampling valves must 
be equipped

[[Page 1078]]

with excess flow valves of approved design except when quick closing 
internal valves of approved design are used. When the interior pipe of 
the gaging device provides a means for the passage of lading from the 
interior to the exterior of the tank, it must be equipped with an excess 
flow valve of approved design or with an orifice not exceeding 0.060 
inch.

[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, 
and amended by Amdt. 179-10, 36 FR 21348, Nov. 6, 1971]