ASTM C924-02(2009)
(Practice)Standard Practice for Testing Concrete Pipe Sewer Lines by Low-Pressure Air Test Method (Withdrawn 2013)
Standard Practice for Testing Concrete Pipe Sewer Lines by Low-Pressure Air Test Method (Withdrawn 2013)
SIGNIFICANCE AND USE
This is not a routine test. The values recorded are applicable only to the sewer being tested and at the time of testing.
SCOPE
1.1 This practice covers procedures for testing concrete pipe sewer lines, when using the low-pressure air test method to demonstrate the integrity of the installed material and the construction procedures. This practice is used for testing 4 to 24-in. circular concrete pipe sewer lines utilizing gasketed joints.
1.2 This practice is also used as a preliminary test to enable the installer to demonstrate the condition of the line prior to backfill.
1.3 A complete metric companion to Practice C 924 has been developed—C 924M; therefore, no metric equivalents are presented in this practice.
Note 1—The user of this practice is advised that air test criteria presented in this practice are similar to those in general use. The test and criteria have been used widely and successfully in testing smaller diameter pipe, but additional data are required to confirm the safety and applicability or develop criteria for pipe larger than 24 in. in diameter. Larger pipe will be accepted more conveniently by visual inspection and individual joint testing.
Note 2—The user of this practice is advised that no correlation has been found between air loss and water leakage.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use (see Section 6, Safety Precautions).
WITHDRAWN RATIONALE
This practice covered procedures for testing concrete pipe sewer lines, when using the low-pressure air test method to demonstrate the integrity of the installed material and the construction procedures. This practice was used for testing 4 to 24-in. circular concrete pipe sewer lines utilizing gasketed joints.
Formerly under the jurisdiction of Committee C13 on Concrete Pipe, this practice was withdrawn in December 2013 with no replacement because of safety concerns when conducting this test.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C924 − 02(Reapproved 2009)
Standard Practice for
Testing Concrete Pipe Sewer Lines by Low-Pressure Air
Test Method
This standard is issued under the fixed designation C924; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope C969 Practice for Infiltration and Exfiltration Acceptance
Testing of Installed Precast Concrete Pipe Sewer Lines
1.1 Thispracticecoversproceduresfortestingconcretepipe
sewer lines, when using the low-pressure air test method to
3. Terminology
demonstrate the integrity of the installed material and the
construction procedures. This practice is used for testing 4 to 3.1 Definitions—Fordefinitionsoftermsrelatingtoconcrete
24-in. circular concrete pipe sewer lines utilizing gasketed pipe, see Terminology C822.
joints.
4. Summary of Practice
1.2 This practice is also used as a preliminary test to enable
the installer to demonstrate the condition of the line prior to 4.1 The sewer line to be tested is plugged.Air is introduced
backfill. at low pressures into the plugged line. The amount of air loss
is used to determine the acceptability of the sewer line.
1.3 AcompletemetriccompaniontoPracticeC924hasbeen
developed—C924M; therefore, no metric equivalents are pre-
5. Significance and Use
sented in this practice.
5.1 This is not a routine test. The values recorded are
NOTE 1—The user of this practice is advised that air test criteria
applicable only to the sewer being tested and at the time of
presented in this practice are similar to those in general use. The test and
testing.
criteriahavebeenusedwidelyandsuccessfullyintestingsmallerdiameter
pipe, but additional data are required to confirm the safety and applica-
bilityordevelopcriteriaforpipelargerthan24in.indiameter.Largerpipe
6. Safety Precautions
will be accepted more conveniently by visual inspection and individual
joint testing. 6.1 The air test will be dangerous if a line is not prepared
NOTE 2—The user of this practice is advised that no correlation has
properly and proper procedures are not followed.
been found between air loss and water leakage.
6.2 It is extremely important that plugs be installed and
1.4 This standard does not purport to address all of the
braced in such a way as to prevent blowouts. It is also
safety concerns, if any, associated with its use. It is the
imperative that the pressure in the pipe be relieved completely
responsibility of the user of this standard to establish appro-
before any plug is loosened for removal.
priate safety and health practices and determine the applica-
NOTE 3—As an example, 4-psi air pressure acting on one side of a
bility of regulatory limitations prior to use (see Section 6,
15-in. plug results in a total force of approximately 700 lbf on the plug.
Safety Precautions).
Such a force is capable of causing the expulsion of an improperly installed
plug.
2. Referenced Documents
6.3 Pressurizing equipment shall include a 6-psi pressure
2.1 ASTM Standards:
relief device to reduce hazards and avoid over-pressurization
C822 Terminology Relating to Concrete Pipe and Related
with possible damage to the line.
Products
6.4 No one shall be allowed in or near the manholes during
pressurization, testing, or depressurization.
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.
CurrenteditionapprovedJune1,2009.PublishedJuly2009.Originallyapproved
7. Capacity of Air Compressor
in 1984. Last previous edition approved in 2002 as C924 – 02. DOI: 10.1520/
C0924-02R09.
7.1 To provide satisfactory test results, the air compressor
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
shall be capable of pressurizing the sewer test section in the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
required test time, or less, as determined by 9.1. The compres-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. sor capacity required to accomplish the pressurization is equal
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C924 − 02 (2009)
TABLE 2 Allowable Air Loss for Various Pipe Sizes
to the rate necessary to fill the sewer to the desired pressure
plus the allowable air loss rate:
3 3
D, Nominal Q ft /min D, Nominal Q ft /min
0.17D L
Pipe Size, in. Pipe Size, in.,
C 5 1Q (1)
T
4215 4
6218 5
where:
8 2 21 5.5
C = compressor capacity, cfm,
10 2.5 24 6
T = required test time, or less, min, 12 3
D = pipe internal diameter, ft,
L = length of test section, ft, and
9.2 Add air until the internal air pressure of the sewer line is
Q = allowable air loss, rate, cfm.
raised to approximately 4 psi. Allow the air pressure to
8. Preparation of the Sewer Line
stabilize.The pressure will normally drop until the temperature
of the air in the line stabilizes.
8.1 Where practical, clean the sewer line prior to testing to
wet the pipe surface and eliminate debris.
9.3 When the pressure has stabilized and is at or above the
starting test pressure of 3.5 psi, commence the test by allowing
NOTE 4—The user of this practice is advised that a wetted interior pipe
the gage pressure to drop to 3.5 psi at which point the time
surface is desirable and will produce more consistent test results.Air may
pass through the walls of dry pipe. This can be overcome by wetting the
recording is initiated. Record the drop in pressure for the test
pipe. If the problem persists, segmental testing of the line will establish if
period.
there is a significant leak.
9.4 If the drop in pressure is 1 psi or less during the test
8.2 Plug all pipe outlets including laterals, which shall be
period,accepttheline.Ifthedropinpressureismorethan1psi
given special attention. Review safety precautions in Section6.
during the test period, inspect, evaluate, and retest the line to
determine the cause of excessive air loss.
9. Procedure
9.5 Use or failure of this air test shall not preclude accep-
9.1 Determine the test time for the sewer line to be tested by
tance by appropriate water infiltration or exfiltration testing,
using Table 1. Table
...
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