Section 38 – Sewer and Storm Drain Construction
12/1/03
38.8
Air loss (Q) with a timed (T) pressure drop:
Q = K x D
2
L / T
Where:
D = nominal size, in. (mm),
K = 0.370 X 10
-3
for inch-pound units,
K = 0.564 X 10
-7
for S.I. units,
L = length of line of one pipe size, ft (m)
Q = air loss, ft
3
/min (m
3
/min), and
T = time for pressure to drop 1.0 psi (7 kPa), min./100’
38-10.02.A.(3) Testing Sewer Collectors With Service Connections
If service connections are included in the test, the lengths of the service connections
may be ignored when computing required test times, unless otherwise specified in the Contract
or directed by the Agency.
Should the section of line include more than one pipe size, determine the minimum test
time for each size and add the test times to arrive at the total test time for the section.
38-10.02.A.(4) Pipeline Acceptance Criteria
If the test time shown in Table 38-2 elapses before the air pressure drops one pound per
square inch (1 psi) gauge, the section undergoing the test shall be deemed to have passed the
test and shall be presumed to be free of defects.
38-10.02.A.(5) Determination Of Line Failure
If the pressure drop is more than one pound per square inch (1 psi) gauge before the time
shown in Table 38-2 has elapsed, the air loss rate is considered excessive and the section of
pipe has failed the test.
Table 38-2
Nominal Pipe Size, D
in. (mm)
Minimum Test Time, T
(Min:sec/100 ft)
Allowable Air Loss, Q
(ft
3
/min)
4 (100)
0:18
2.0
6 (150)
0:42
2.0
8 (205)
1:12
2.0
10 (255)
1:30
2.5
12 (305)
1:48
3.0
15 (380)
2:06
4.0
18 (455)
2:24
5.0
21 (535)
3:00
5.5
24 (610)
3:36
6.0
27 (685)
4:12
6.5
30 (760)
4:48
7.0
33 (840)
5:24
7.5
36 (915)
6:00
8.0
39 (990)
6:36
8.5



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