[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: 49CFR179.100-12]



[Page 1039]

 

                        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. 179.100-12  Manway nozzle, cover and protective housing.



    (a) Manway nozzles must be of approved design of forged or rolled 

steel for steel tanks or of fabricated aluminum alloy for aluminum 

tanks, with an access opening of at least 18 inches inside diameter, or 

at least 14 inches by 18 inches around or oval. Each nozzle must be 

welded to the tank and the opening reinforced in an approved manner in 

compliance with the requirements of AAR Specifications for Tank Cars, 

appendix E, Figure E10 (IBR, see Sec. 171.7 of this subchapter).

    (b) Manway cover shall be machined to approved dimensions and be of 

forged or rolled carbon or alloy steel, rolled aluminum alloy or nickel 

when required by the lading. Minimum thickness is listed in Sec. 

179.101. Manway cover shall be attached to manway nozzle by through or 

stud bolts not entering tank, except as provided in Sec. 179.103-2(a).

    (c) Except as provided in Sec. 179.103, protective housing of cast, 

forged or fabricated approved materials must be bolted to manway cover 

with not less than twenty \3/4\-inch studs. The shearing value of the 

bolts attaching protective housing to manway cover must not exceed 70 

percent of the shearing value of bolts attaching manway cover to manway 

nozzle. Housing must have steel sidewalls not less than three-fourths 

inch in thickness and must be equipped with a metal cover not less than 

one-fourth inch in thickness that can be securely closed. Housing cover 

must have suitable stop to prevent cover striking loading and unloading 

connections and be hinged on one side only with approved riveted pin or 

rod with nuts and cotters. Openings in wall of housing must be equipped 

with screw plugs or other closures.



[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, 

and amended by Amdt. 179-10, 36 FR 21345, Nov. 6, 1971; 68 FR 75760, 

Dec. 31, 2003]