§ 18.98. Enclosures, joints, and fastenings; pressure testing.
91 words·~1 min read·
/us/cfr/t30/s§ 18.98·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(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.