[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: 49CFR179.102-4]



[Page 1043]

 

                        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. 179.102-4  Vinyl fluoride, stabilized.



    Each tank used to transport vinyl fluoride, stabilized, must comply 

with the following special requirements:

    (a) All plates for the tank must be fabricated of material listed in 

paragraph (a)(2) of this section, and appurtenances must be fabricated 

of material listed in paragraph (a)(1) or (a)(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 complying with ASTM Specification A 516 (IBR, see Sec. 

171.7 of this subchapter); Grade 70; ASTM Specification A 537 (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 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.

    (b) Insulation must be of approved material.

    (c) Excess flow valves must be installed under all liquid and vapor 

valves, except safety relief valves.

    (d) A thermometer well may be installed.

    (e) Only an approved gaging device may be installed.

    (f) A pressure gage may be installed.

    (g) Aluminum, copper, silver, zinc, or an alloy containing any of 

these metals may not be used in the tank construction, or in fittings in 

contact with the lading.

    (h) The jacket must be stenciled, adjacent to the water capacity 

stencil,



MINIMUM OPERATING TEMPERATURE -- [deg]F.



    (i) The tank car and insulation must be designed to prevent the 

vapor pressure of the lading from increasing from the pressure at the 

maximum allowable filling density to the start-to-discharge pressure of 

the reclosing pressure relief valve within 30 days, at an ambient 

temperature of 90 [deg]F.



[Amdt. 179-32, 48 FR 27707, June 16, 1983, as amended at 49 FR 24317, 

June 12, 1984; 49 FR 42736, Oct. 24, 1984; Amdt. 179-45, 55 FR 52728, 

Dec. 21, 1990; Amdt. 179-52, 61 FR 28680, June 5, 1996; 65 FR 58632, 

Sept. 29, 2000; 66 FR 33452, June 21, 2001; 66 FR 45186, 45390, Aug. 28, 

2001; 67 FR 51660, Aug. 8, 2002; 68 FR 75758, 75760 Dec. 31, 2003]