Air-Testing Chart
| |||||
---|---|---|---|---|---|
Groundwater Above Pipe (feet)
|
Pressure Adjustment (pounds per square
inch)
|
Initial Pressure (pounds per square inch)
|
Stabilized Pressure (pounds per square
inch)
|
Allowable Residual Pressure (pounds per
square inch)
| |
0.0
|
0.0
|
4.0
|
3.5
|
2.5
| |
1.0
|
0.43
|
4.43
|
3.93
|
2.93
| |
2.0
|
0.87
|
4.87
|
4.37
|
3.37
| |
3.0
|
1.30
|
5.30
|
4.80
|
3.80
| |
4.0
|
1.74
|
5.74
|
5.24
|
4.24
| |
5.0
|
2.17
|
6.17
|
5.67
|
4.67
| |
6.0
|
2.60
|
6.60
|
6.10
|
5.10
|
NOTE: Elapsed time for pressure to reduce to
the allowable pressure should not be less than one and zero-tenths
(1.0) minute per inch diameter of the particular pipe being tested.
|
L
|
=
|
(S x D x P0.5)/133,200
| ||
Where:
| ||||
L
|
=
|
Allowance leakage in gallons per hour.
| ||
S
|
=
|
The length of pipe tested in feet.
| ||
D
|
=
|
The nominal diameter of the pipe in inches.
| ||
P
|
=
|
The average test pressure during the leakage
test in pounds per square inch.
|
Depth of Manhole
(feet)
|
Minimum Test Time
| |
---|---|---|
0 to 10
|
1 minute
| |
10.1 to 15
|
1 minute 15 seconds
| |
15.1 to 25
|
1 minute 30 seconds
|