[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: 49CFR179.100-4]



[Page 1037]

 

                        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. 179.100-4  Insulation.



    (a) If insulation is applied, the tank shell and manway nozzle must 

be insulated with an approved material. The entire insulation must be 

covered with a metal jacket of a thickness not less than 11 gauge 

(0.1196 inch) nominal (Manufacturers' Standard Gauge) and flashed around 

all openings so as to be weather-tight. The exterior surface of a carbon 

steel tank, and the inside surface of a carbon steel jacket must be 

given a protective coating.

    (b) If insulation is a specification requirement, it shall be of 

sufficient thickness so that the thermal conductance at 60 [deg]F is not 

more than 0.075 Btu per hour, per square foot, per degree F temperature 

differential. If exterior heaters are attached to tank, the thickness of 

the insulation over each heater element may be reduced to one-half that 

required for the shell.



[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, 

and amended by Amdt. 179-10, 36 FR 21344, Nov. 6, 1971; Amdt. 179-50, 60 

FR 49077, Sept. 21, 1995]