---
kind: "section"
citation: "30 C.F.R. § 7.307"
title: "30"
number: "7.307"
heading: "Static pressure test."
url: "https://uscodex.org/cfr/30/7.307"
---

# §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.

## Notes

### Source

Source: 57 FR 61193, Dec. 23, 1992, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 957.

### Source

Source: 53 FR 23500, June 22, 1988, unless otherwise noted.