Current through May 31, 2024
Section 7.307 - Static pressure test(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.