§18.98. Enclosures, joints, and fastenings; pressure testing.
30 C.F.R. § 18.98
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.
Notes, amendments, and revision history
Source
Source: 36 FR 7007, Apr. 13, 1971, unless otherwise noted.
Authority
Authority: 30 U.S.C. 957, 961.
Source
Source: 33 FR 4660, Mar. 19, 1968, unless otherwise noted.