Table 1 to Paragraph (e)(1)-Allowable Cargo Tank Test Pressure or Vacuum Change
Cargo tank or compartment capacity, liters (gal) | Annual certification- allowable pressure or vacuum change ([DELTA] p, [DELTA] v) in 5 minutes, mm H 2 O (in. H 2 O) | Annual certification- allowable pressure or vacuum change ([DELTA] p, [DELTA] v) in 5 minutes, mm H 2 O (in. H 2 O)] | Allowable pressure change ([DELTA] p) in 5 minutes at any time, mm H 2 O (in. H 2 O) |
9,464 or more (2,500 or more) | 25 (1.0) | 12.7 (0.50) | 64 (2.5) |
9,463 to 5,678 (2,499 to 1,500) | 38 (1.5) | 19.1 (0.75) | 76 (3.0) |
5,677 to 3,785 (1,499 to 1,000) | 51 (2.0) | 25.4 (1.00) | 89 (3.5) |
3,784 or less (999 or less) | 64 (2.5) | 31.8 (1.25) | 102 (4.0) |
T = Vh * 0.004
where:
T = maximum allowable time to pressurize the cargo tank, min;
Vh = cargo tank headspace volume during testing, gal.
where:
(PF) = minimum allowable final headspace pressure, in. H2 O, gauge;
Vs = total cargo tank shell capacity, gal;
Vh = cargo tank headspace volume after loading, gal;
18.0 = initial pressure at start of test, in. H2 O, gauge;
N = 5-minute continuous performance standard at any time from the fourth column of table 1 to paragraph (e)(1) of this section, inches H2 O.
Table 3-Pressure Change for Internal Vapor Valve Test
Time interval | Interval pressure change, mm H2 O (in. H2 O) |
After 1 minute | 28 (1.1) |
After 2 minutes | 56 (2.2) |
After 3 minutes | 84 (3.3) |
After 4 minutes | 112 (4.4) |
After 5 minutes | 140 (5.5) |
40 C.F.R. §63.425