C.M.R. 06, 096, ch. 691, app 096-691-C
For Piping and Tanks
1. Air pressure testing of tanks and piping shall only be performed on new, empty tanks and piping, which have never contained product, and the manufacturer has not specified an alternate means of tightness testing.
2. When conducting an air pressure test on metallic tanks or piping, all external joints, seams and connections shall be soaped.
3. The test shall be maintained for a minimum of 1 hour, and all soaped areas shall be visually inspected for bubbles or any other indication of a leak.
4. Any loss of pressure or appearance of bubbles shall constitute failure of the test.
Piping
5. Underground piping shall be physically isolated from the tank prior to the test.
6. Underground primary piping shall be air tested to 150 percent of the maximum anticipated pressure of the system, but not less than fifty (50) pounds per square inch (psi) gauge at the highest point of the system.
7. Underground secondary piping must be tightness tested before being backfilled in accordance with manufacturers' instructions.
Tanks
8. Tanks shall be tested before being covered, enclosed or placed in service.
9. Primary tanks must be air tested at not less than three (3) pounds per square inch (psi) and not more than five (5) pounds per square inch (psi) gauge. Gauges used during air testing of tanks must have a maximum limit of 10-15 pounds per square inch (psi).
10. The interstitial space of double-walled tanks must be tightness tested following the manufacturer's instructions.
C.M.R. 06, 096, ch. 691, app 096-691-C