ASTM C924M-02

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Designation:C924M–02
Standard Practice for
Testing Concrete Pipe Sewer Lines by Low-Pressure Air
1
Test Method (Metric)
This standard is issued under the fixed designation C 924M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Summary of Practice
1.1 Thispracticecoversproceduresfortestingconcretepipe 4.1 The sewer line to be tested is plugged.Air is introduced
sewer lines, when using the low-pressure air test method to at low pressures into the plugged line. The amount of air loss
demonstrate the integrity of the installed material and the is used to determine the acceptability of the sewer line.
constructionprocedures.Thispracticeisusedfortesting100to
5. Significance and Use
600-mm circular concrete pipe sewer lines utilizing gasketed
5.1 This is not a routine test. The values recorded are
joints.
1.2 This practice is also be used as a preliminary test to applicable only to the sewer being tested and at the time of
testing.
enable the installer to demonstrate the condition of the line
prior to backfill.
6. Safety Precautions
1.3 This standard does not purport to address all of the
6.1 The air test will be dangerous if a line is not prepared
safety concerns, if any, associated with its use. It is the
properly and proper procedures are not followed.
responsibility of the user of this standard to establish appro-
6.2 It is extremely important that plugs be installed and
priate safety and health practices and determine the applica-
braced in such a way as to prevent blowouts. It is also
bility of regulatory limitations prior to use (see Section 6,
imperative that the pressure in the pipe be relieved completely
Safety Precautions).
before any plug is loosened for removal.
1.4 This practice is the metric companion to Practice C 924.
NOTE 3—As an example, 27-kPa air pressure acting on one side of a
NOTE 1—The user of this practice is advised that air test criteria
375-mm plug results in a total force of approximately 3100 N on the plug.
presented in this practice are similar to those in general use. The test and
Such a force is capable of causing the expulsion of an improperly installed
criteriahavebeenusedwidelyandsuccessfullyintestingsmallerdiameter
plug.
pipe, but additional data are required to confirm the safety and applica-
bility or develop criteria for pipe larger than 600 mm in diameter. Larger
6.3 Pressurizing equipment shall include a 42-kPa pressure
pipe will be accepted more conveniently by visual inspection and
relief device to reduce hazards and avoid over-pressurization
individual joint testing.
with damage to the line.
NOTE 2—The user of this practice is advised that no correlation has
6.4 No one shall be allowed in or near the manholes during
been found between air loss and water leakage.
pressurization, testing, or depressurization.
2. Referenced Documents
7. Capacity of Air Compressor
2.1 ASTM Standards:
7.1 To provide satisfactory test results, the air compressor
C 822 Terminology Relating to Concrete Pipe and Related
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shall be capable of pressurizing the sewer test section in the
Products
required test time, or less, as determined by 9.1. The compres-
C 969 Practice for Infiltration and Exfiltration Acceptance
2
sor capacity required to accomplish the pressurization is equal
Testing of Installed Precast Concrete Pipe Sewer Lines
to the rate necessary to fill the sewer to the desired pressure
3. Terminology
plus the allowable air loss rate:
3.1 Definitions—For definitions of terms relating to con-
2
0.17D L
C 5 1 Q (1)
crete pipe, see Terminology C 822.
T
where:
3
1
C = compressor capacity, m /s,
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.
T = required test time, or less, s,
Current edition approved Aug. 10, 2002. Published October 2002. Originally
D = pipe internal diameter, m,
published as C 924M – 84. Last previous edition C 924M – 89(1998).
L = length of test section, m, and
2
Annual Book of ASTM Standards, Vol 04.05.
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C924M–02
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TABLE 2 Allowable Air Loss for Various Pipe Sizes
Q = allowable air loss, rate, m /s.
D, Nominal D, Nominal
3 3
Q,m /min Q,m /min
Pipe Size, mm Pipe Size, mm
8. Preparation of the Sewer Line
100 0.06 375 0.11
8.1 Where practical, clean the sewer line prior to testing to
150 0.06 450 0.14
wet the pipe surface and eliminate debris.
200 0.06 525 0.15
250 0.07 600 0.17
N
...