[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR179.102-4]

[Page 1013-1014]
 
                        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.  179.102-4  Vinyl fluoride, inhibited.

    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 (incorporated by reference; 
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 A516; Grade 70; ASTM 
Specification A537, Class 1; or AAR Specification TC128, Grade B, in 
which case impact tests must be performed as follows:
    (i) ASTM Specification A516 and A537 material must meet the Charpy 
V-notch test requirements, in longitudinal direction of rolling, of ASTM 
Specification A20.
    (ii) AAR Specification TC128 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 
Specification A 370.

[[Page 1014]]

    (iii) Production welded test plates must--
    (A) Be prepared in accordance with AAR Specifications for Tank Cars, 
appendix W, W4.00;
    (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]