N.H. Code Admin. R. Env-Or 504.09 – Pressure Decay Test Procedures, Criteria, and Required Actions

(a) The pressure decay test required by Env-Or 504.07(b) shall be performed:
1. (1) Following the PV vent cap test specified in Env-Or 504.08; and
2. (2) In accordance with CARB TP-201.3, as amended July 26, 2012, except that the test shall be performed at 10 inches water column pressure and include any couplers, adapters, reducers and/or non-mechanical fittings in the test.
(b) To pass the pressure decay test, the minimum allowable final pressure after the system has been pressurized to 10 inches water column and held for 5 minutes shall be as specified in Table 500-1, below:
Table 500-1 Minimum Allowable Pressure
Ullage (gallons)
Minimum Allowable Pressure (inches water column)
Ullage (gallons)
Minimum Allowable Pressure (inches water column)
500
3.70
5,000
9.30
600
4.50
6,000
9.38
700
5.20
7,000
9.46
800
5.80
8,000
9.52
900
6.20
9,000
9.56
1,000
6.50
10,000
9.60
1,250
7.05
11,000
9.62
1,500
7.50
12,000
9.64
1,750
7.90
13,000
9.66
2,000
8.20
14,000
9.68
2,250
8.35
15,000
9.70
2,500
8.50
16,000
9.71
2,750
8.60
17,000
9.71
3,000
8.70
18,000
9.72
3,250
8.80
19,000
9.73
3,500
8.90
20,000
9.73
3,750
9.00
21,000
9.74
4,000
9.10
22,000
9.75
4,250
9.15
23,000
9.75
4,500
9.20
24,000
9.76
4,750
9.25
25,000
9.77
(c) If the stage I system does not pass the pressure decay test, the owner or operator shall undertake such repairs as are necessary and retest until the stage I system passes the test.

Source. (See Revision Note #1 and Revision Note #2 at chapter heading for Env-Or 500) #10229, eff 11-17-12; ss by #13458, eff 10-7-23 (formerly Env-Or 504.10)