MSHA - Code of Federal Regulations - 30 CFR 18.98
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DEPARTMENT OF LABOR
Mine Safety and Health Administration - MSHA
- Protecting Miners' Safety and Health Since 1978
30 CFR § 18.98
Enclosures, joints, and fastenings; pressure testing.
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.
Pneumatic field testing of explosion-proof enclosures shall be conducted by determining:
Leak performance with a peak dynamic or static pressure of 150 pounds per square inch (gage); or
A pressure rise and rate of decay consistent with unyielding components during a pressure-time history as derived from a series of oscillograms.
Welded joints forming an enclosure shall have continuous gastight welds.
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