§179.100-4 Insulation.

(a) If insulation is applied, the tank shell and manway nozzle must be insulated with an approval material. The entire insulation must be covered with a metal jacket of a thickness not less than 11 gauge (0.096 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�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]