[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: 49CFR179.100-10]

[Page 1009]
 
                        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.  179.100-10  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.
    (b) For aluminum tanks, postweld heat treatment is prohibited.
    (c) Tank and welded attachments, fabricated from ASTM A 240/A 240M 
(incorporated by reference; 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]