[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: 49CFR179.102-17]

[Page 1031]
 
                        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. 179.102-17  Hydrogen chloride, refrigerated liquid.

    Each tank car used to transport hydrogen chloride, refrigerated 
liquid must comply with the following special requirements:
    (a) The tank car must comply with Specification DOT-105J600W and be 
designed for loading at minus 50 [deg]F. or colder.
    (b) All plates for the tank must be fabricated of material listed in 
paragraph (b)(2) of this section, and appurtenances must be fabricated 
of material listed in paragraph (b)(1) or (b)(2) of this section.
    (1) Stainless steel, ASTM A 240/A 240M (IBR, see Sec. 171.7 of this 
subchapter), Type 304, 304L, 316, or 316L, in which case impact tests 
are not required; or
    (2) Steel conforming to ASTM A 516/A 516M (IBR, see Sec. 171.7 of 
this subchapter), Grade 70; ASTM A 537/A 537M, (IBR, see Sec. 171.7 of 
this subchapter) Class 1; or AAR Specification TC 128, Grade B in which 
case impact tests must be performed as follows:
    (i) ASTM A 516/A 516M and A 537/A 537M material must meet the Charpy 
V-notch test requirements, in longitudinal direction of rolling, of ASTM 
A 20/A 20M (IBR, see Sec. 171.7 of this subchapter).
    (ii) AAR Specification TC 128 material must meet the Charpy V-notch 
test requirements, in longitudinal direction of rolling of 15 ft.-lb. 
minimum average for 3 specimens, with a 10 ft.-lb. minimum for any one 
specimen, at minus 50 [deg]F or colder, in accordance with ASTM A 370 
(IBR, see Sec. 171.7 of this subchapter).
    (iii) Production welded test plates must--
    (A) Be prepared in accordance with AAR Specifications for Tank Cars, 
appendix W, W4.00 (IBR, see Sec. 171.7 of this subchapter);
    (B) include impact test specimens of weld metal and heat affected 
zone prepared and tested in accordance with AAR Specifications for Tank 
Cars, appendix W, W9.00; and
    (C) meet the same impact requirements as the plate material.
    (c) Insulation must be of approved material.
    (d) Pressure relief valves must be trimmed with monel or other 
approved material and equipped with a rupture disc of silver, 
polytetrafluoroethylene coated monel, or tantalum. Each pressure relief 
device shall have the space between the rupture disc and the valve 
vented with a suitable auxiliary valve. The discharge from each pressure 
relief valve must be directed outside the protective housing.
    (e) Loading and unloading valves must be trimmed with Hastelloy B or 
C, monel, or other approved material, and identified as ``Vapor'' or 
``Liquid''. Excess flow valves must be installed under all liquid and 
vapor valves, except safety relief valves.
    (f) A thermometer well may be installed.
    (g) Only an approved gaging device may be installed.
    (h) A sump must be installed in the bottom of the tank under the 
liquid pipes.
    (i) All gaskets must be made of, or coated with, 
polytetrafluoroethylene or other approved material.
    (j) The tank car tank may be equipped with exterior cooling coils on 
top of the tank car shell.
    (k) The jacket must be stenciled, adjacent to the water capacity 
stencil,

MINIMUM OPERATING TEMPERATURE -- [deg]F.

    (l) The tank car and insulation must be designed to prevent the 
pressure of the lading from increasing from the pressure at the maximum 
allowable filling density to the start-to-discharge pressure of the 
pressure relief valve within 30 days, at an ambient temperature of 
90[deg] F.

[Amdt. 179-32, 48 FR 27708, June 16, 1983, as amended at 48 FR 50441, 
Nov. 1, 1983; 49 FR 24317, June 12, 1984; 49 FR 42736, Oct. 24, 1984; 
Amdt. 179-45, 55 FR 52728, Dec. 21, 1990; 66 FR 45390, Aug. 28, 2001; 67 
FR 51660, Aug. 8, 2002; 68 FR 75758, 75760, Dec. 31, 2003]