[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR179.100-12]

[Page 1026]
 
                        TITLE 49--TRANSPORTATION
 
 CHAPTER I--RESEARCH AND SPECIAL PROGRAMS 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]