Thermal protection system.

The DOT Specification 117 tank car must have a thermal protection system. The thermal protection system must: (a) Conform to § 179.18 of this part; (b) Be equipped with a thermal protection blanket with at least 1/2 -inch-thick material that meets § 179.18(c) of this part; and (c) Include a reclosing pressure relief device in accordance with § 173.31 of this subchapter. [81 FR 53957, Aug. 15, 2016]