§ 7.307. Static pressure test.
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/us/cfr/t30/s§ 7.307·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)Test procedure.
(1)The enclosure shall be internally pressurized to a minimum of 150 psig and the pressure maintained for a minimum of 10 seconds.
(2)Following the pressure hold, the pressure shall be removed and the pressurizing agent removed from the enclosure.
(b)Acceptable performance.
(1)The enclosure during pressurization shall not exhibit---
(i)Leakage through welds or casting; or
(ii)Rupture of any part that affects the explosion-proof integrity of the enclosure.
(2)The enclosure following removal of the pressurizing agent shall not exhibit---
(i)Visible cracks in welds;
(ii)Permanent deformation exceeding 0.040 inches per linear foot; or
(iii)Clearances, in excess of those specified in this subpart, along accessible flame-arresting paths, following any necessary retightening of fastenings.
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§ 7.307
Static pressure test.
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