[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR179.100-10]

[Page 1071]
 
                        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.  179.100-10  Postweld heat treatment.

    (a) After welding is complete, steel tanks and all attachments 
welded thereto must be postweld heat treated as a unit in compliance 
with the requirements of AAR Specifications for Tank Cars, appendix W 
(IBR, see Sec.  171.7 of this subchapter).
    (b) For aluminum tanks, postweld heat treatment is prohibited.
    (c) Tank and welded attachments, fabricated from ASTM A 240/A 240M 
(IBR, see Sec.  171.7 of this subchapter), Type 304L or Type 316L 
materials do not require postweld heat treatment, but these materials do 
require a corrosion resistance test as specified in Sec.  179.100-
7(c)(2).

[Amdt. 179-10, 36 FR 21345, Nov. 6, 1971, as amended by Amdt. 179-47, 58 
FR 50238, Sept. 24, 1993; Amdt. 179-52, 61 FR 28679, June 5, 1996; 67 FR 
51660, Aug. 8, 2002; 68 FR 75758 and 75759, Dec. 31, 2003]