30 C.F.R. § 18.98 Enclosures, joints, and fastenings; pressure testing.
Title 30 - Mineral Resources
(a) Cast or welded enclosures shall be designed to withstand a minimum internal pressure of 150 pounds per square inch (gage). Castings shall be free from blowholes. (b) Pneumatic field testing of explosion-proof enclosures shall be conducted by determining: (1) Leak performance with a peak dynamic or static pressure of 150 pounds per square inch (gage); or (2) A pressure rise and rate of decay consistent with unyielding components during a pressure-time history as derived from a series of oscillograms. (c) Welded joints forming an enclosure shall have continuous gastight welds.
Title 30: Mineral Resources
PART 18—ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES
Subpart E—Field Approval of Electrically Operated Mining Equipment
§ 18.98 Enclosures, joints, and fastenings; pressure testing.
