ASTM C924M-02(2009)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation: C924M − 02 (Reapproved 2009)
Standard Practice for
Testing Concrete Pipe Sewer Lines by Low-Pressure Air
Test Method (Metric)
This standard is issued under the fixed designation C924M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 Thispracticecoversproceduresfortestingconcretepipe 3.1 Definitions—For definitions of terms relating to con-
sewer lines, when using the low-pressure air test method to crete pipe, see Terminology C822.
demonstrate the integrity of the installed material and the
constructionprocedures.Thispracticeisusedfortesting100to 4. Summary of Practice
600-mm circular concrete pipe sewer lines utilizing gasketed
4.1 The sewer line to be tested is plugged.Air is introduced
joints.
at low pressures into the plugged line. The amount of air loss
1.2 This practice is also be used as a preliminary test to is used to determine the acceptability of the sewer line.
enable the installer to demonstrate the condition of the line
prior to backfill. 5. Significance and Use
1.3 This practice is the SI companion to Practice C924. 5.1 This is not a routine test. The values recorded are
applicable only to the sewer being tested and at the time of
NOTE 1—The user of this practice is advised that air test criteria
testing.
presented in this practice are similar to those in general use. The test and
criteriahavebeenusedwidelyandsuccessfullyintestingsmallerdiameter
pipe, but additional data are required to confirm the safety and applica- 6. Safety Precautions
bility or develop criteria for pipe larger than 600 mm in diameter. Larger
6.1 The air test will be dangerous if a line is not prepared
pipe will be accepted more conveniently by visual inspection and
properly and proper procedures are not followed.
individual joint testing.
NOTE 2—The user of this practice is advised that no correlation has
6.2 It is extremely important that plugs be installed and
been found between air loss and water leakage.
braced in such a way as to prevent blowouts. It is also
1.4 This standard does not purport to address all of the
imperative that the pressure in the pipe be relieved completely
safety concerns, if any, associated with its use. It is the
before any plug is loosened for removal.
responsibility of the user of this standard to establish appro-
NOTE 3—As an example, 27-kPa air pressure acting on one side of a
priate safety and health practices and determine the applica-
375-mm plug results in a total force of approximately 3100 N on the plug.
bility of regulatory limitations prior to use (see Section 6,
Such a force is capable of causing the expulsion of an improperly installed
Safety Precautions).
plug.
6.3 Pressurizing equipment shall include a 42-kPa pressure
2. Referenced Documents
relief device to reduce hazards and avoid over-pressurization
2.1 ASTM Standards:
with damage to the line.
C822 Terminology Relating to Concrete Pipe and Related
6.4 No one shall be allowed in or near the manholes during
Products
pressurization, testing, or depressurization.
C969 Practice for Infiltration and Exfiltration Acceptance
Testing of Installed Precast Concrete Pipe Sewer Lines
7. Capacity of Air Compressor
7.1 To provide satisfactory test results, the air compressor
shall be capable of pressurizing the sewer test section in the
This practice is under the jurisdiction of ASTM Committee C13 on Concrete
Pipe and is the direct responsibility of Subcommittee C13.09 on Methods of Test.
required test time, or less, as determined by 9.1. The compres-
CurrenteditionapprovedJune1,2009.PublishedJuly2009.Originallyapproved
sor capacity required to accomplish the pressurization is equal
in 1984. Last previous edition approved in 2002 as C924M – 02. DOI: 10.1520/
to the rate necessary to fill the sewer to the desired pressure
C0924M-02R09.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or plus the allowable air loss rate:
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
0.17D L
Standards volume information, refer to the standard’s Document Summary page on
C 5 1Q (1)
the ASTM website. T
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
C924M − 02 (2009)
TABLE 2 Allowable Air Loss for Various Pipe Sizes
where:
D, Nominal D, Nominal
3 3
C = compressor capacity, m /s,
Q,m /min Q,m /min
Pipe Size, mm Pipe Size, mm
T = required test time, or less, s,
100 0.06 375 0.11
D = pipe internal diameter, m,
150 0.06 450 0.14
L = length of test section, m, and
200 0.06 525 0.15
Q = allowable air loss, rate, m /s.
250 0.07 600 0.17
300 0.08
8. Preparation of the Sewer Line
8.1 Where practical, clean the sewer line prior to testing to
stabilize.The pressure will normally drop until the temperature
wet the pipe surface and eliminate debris.
of the air in the line stabilizes.
NOTE 4—The user of this practice is advised that a wetted interior pipe
9.3 When the pressure has stabilized and is at or above the
surface is desirable and will produce more consistent test results.Air may
starting test pressure of 24 kPa, commence the test by allowing
pass through the walls of dry pipe. This can be overcome by wetting the
the gage pressure to drop to 24 kPa at which point the time
pipe. If the problem persists, segmental testing of the line will establish if
there is a significant leak. recording is initiated. Record the drop in pressure for the test
period.
8.2 Plug all pipe outlets including laterals, which shall be
given special attention. Review safety precautions in Section6.
9.4 If the drop in pressure is 7 kPa or less during the test
period, accept the line. If the drop in pressure is more than 7
9. Procedure
kPa during the test period, inspect, evaluate, and retest the line
9.1 Determine the test time for the sewer line to be tested by to determine the cause of excessive air loss.
using Table 1. Table 1 has been established using the criteria
9.5 Use or failure of this air test shall not preclude accep-
specified in Table 2, and the formulas contained in Appendix
tance by appropriate water infiltration or exfiltration testing,
X1. The test time is the time required for the pressure to drop
(see Practice C969), or other means.
from 24 kPa to 17 k
...