---
kind: "section"
citation: "49 C.F.R. § 179.102-17"
title: "49"
number: "179.102-17"
heading: "Hydrogen chloride, refrigerated liquid."
url: "https://uscodex.org/cfr/49/179.102-17"
---

# §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 °F. or colder.
- (b) All plates for the tank must be fabricated of material listed in [paragraph (b)(2)](#b-2) of this section, and appurtenances must be fabricated of material listed in paragraph [(b)(1)](#b-1) or [(b)(2)](#b-2) of this section.
  - (1) Stainless steel, ASTM A 240/A 240M (IBR, see [§ 171.7](/cfr/49/171.7.md) 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 [§ 171.7](/cfr/49/171.7.md) of this subchapter), Grade 70; ASTM A 537/A 537M, (IBR, see [§ 171.7](/cfr/49/171.7.md) 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 [§ 171.7](/cfr/49/171.7.md) 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 °F or colder, in accordance with ASTM A 370 (IBR, see [§ 171.7](/cfr/49/171.7.md) 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 [§ 171.7](/cfr/49/171.7.md) 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,
- (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° F.
- (m) Except as provided in [§ 173.314(d)](/cfr/49/173.314.md?p=d), tank cars built on or after March 16, 2009 used for the transportation of hydrogen chloride, refrigerated liquid, must meet the applicable authorized tank car specification listed in [§ 173.314(c)](/cfr/49/173.314.md?p=c).

## Notes

### Amendments

[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; 74 FR 1802, Jan. 13, 2009]

### Authority

Authority: 49 U.S.C. 5101-5128; 49 CFR 1.81 and 1.97.

### Source

Source: 29 FR 18995, Dec. 29, 1964, unless otherwise noted. Redesignated at 32 FR 5606, Apr. 5, 1967.

### Amendments

[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; 74 FR 1802, Jan. 13, 2009]