[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: 49CFR179.100-14]



[Page 1040]

 

                        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. 179.100-14  Bottom outlets.



    (a) Bottom outlets for discharge of lading is prohibited, except as 

provided in Sec. 179.103-3. If indicated in Sec. 179.101, tank may be 

equipped with a bottom washout of approved construction. If applied, 

bottom washout shall be in accordance with the following requirements;

    (1) The extreme projection of the bottom washout equipment may not 

be more than that allowed by appendix E of the AAR Specifications for 

Tank Cars (IBR, see Sec. 171.7 of this subchapter).

    (2) Bottom washout shall be of cast, forged or fabricated metal and 

shall be fusion-welded to the tank. It shall be of good weldable quality 

in conjunction with metal of tank.

    (3) If the bottom washout nozzle extends 6 inches or more from shell 

of tank, a V-shaped breakage groove shall be cut (not cast) in the upper 

part of the outlet nozzle at a point immediately below the lowest part 

of the inside closure seat or plug. In no case may the nozzle wall 

thickness at the root of the ``V'' be more than \1/4\-inch. Where the 

nozzle is not a single piece, provision shall be made for the equivalent 

of the breakage groove. The nozzle must be of a thickness to insure that 

accidental breakage will occur at or below the ``V'' groove or its 

equivalent. On cars without continuous center sills, the breakage groove 

or its equivalent may not be more than 15 inches below the tank shell. 

On cars with continuous center sills, the breakage groove or its 

equivalent must be above the bottom of the center sill construction.

    (4) The closure plug and seat shall be readily accessible or 

removable for repairs.

    (5) The closure of the washout nozzle must be equipped with a \3/4\-

inch solid screw plug. Plug must be attached by at least a \1/4\-inch 

chain.

    (6) Joints between closures and their seats may be gasketed with 

suitable material.

    (b) [Reserved]



[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; Amdt. 179-40, 52 

FR 13046, Apr. 20, 1987; 66 FR 45186, Aug. 28, 2001; 68 FR 75760, Dec. 

31, 2003]