[Code of Federal Regulations]

[Title 49, Volume 2]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR179.103-3]



[Page 1045]

 

                        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 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]