1、Designation: C 1244 05ae1Standard Test Method forConcrete Sewer Manholes by the Negative Air Pressure(Vacuum) Test Prior to Backfill1This standard is issued under the fixed designation C 1244; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTETable 1 was reformatted editorially in February 2006.1. Scope1.1 This test method covers procedures f
3、or testing precastconcrete manhole sections when using the vacuum test methodto demonstrate the integrity of the installed materials and theconstruction procedures. This test method is used for testingconcrete manhole sections utilizing mortar, mastic, or gasketedjoints.1.2 This test method is inten
4、ded to be used as a preliminarytest to enable the installer to demonstrate the condition of theconcrete manholes prior to backfill.1.3 This standard does not purport to address all of thesafety problems, if any, associated with its use. It is theresponsibility of the user of this standard to establi
5、sh appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.4 This test method is the companion to metric TestMethod C 1244M; therefore, no SI equivalents are shown inthis test method.NOTE 1Vacuum test criteria presented in this test method a
6、re similarto those in general use. The test and criteria have been widely andsuccessfully used in testing manholes.NOTE 2The user of this test method is advised that no correlation hasbeen found between vacuum (air) and hydrostatic tests.2. Referenced Documents2.1 ASTM Standards:2C 822 Terminology R
7、elating to Concrete Pipe and RelatedProductsC 924 Practice for Testing Concrete Pipe Sewer Lines byLow-Pressure Air Test MethodC 969 Practice for Infiltration and Exfiltration AcceptanceTesting of Installed Precast Concrete Pipe Sewer LinesC 1244M Test Method for Concrete Sewer Manholes by theNegati
8、ve Air Pressure (Vacuum) Test Prior to Backfill3. Terminology3.1 For definitions of terms relating to manholes, seeTerminology C 822.4. Summary of Practice4.1 All lift holes and any pipes entering the manhole are tobe plugged.Avacuum will be drawn and the vacuum drop overa specified time period is u
9、sed to determine the acceptability ofthe manhole.5. Significance and Use5.1 This is not a routine test. The values recorded areapplicable only to the manhole being tested and at the time oftesting.6. Preparation of the Manhole6.1 All lift holes shall be plugged.6.2 All pipes entering the manhole sha
10、ll be temporarilyplugged, taking care to securely brace the pipes and plugs toprevent them from being drawn into the manhole.7. Procedure7.1 The test head shall be placed at the top of the manholein accordance with the manufacturers recommendations.7.2 A vacuum of 10 in. Hg shall be drawn on the man
11、hole,the valve on the vacuum line of the test head closed, and thevacuum pump shut off. The time shall be measured for thevacuum to drop to 9 in. Hg.7.3 The manhole is acceptable if the time for the vacuumreading to drop from 10 in. Hg to 9 in. Hg meets or exceeds thevalues indicated in Table 1 or T
12、able .1This test method is under the jurisdiction of ASTM Committee C13 onConcrete Pipe and is the direct responsibility of Subcommittee C13.06 on Manholesand Specials.Current edition approved Oct. 1, 2005. Published November 2005. Originallyapproved in 1993. Last previous edition approved in 2005 a
13、s C 1244 05.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Dr
14、ive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.4 If the manhole fails the initial test, the manhole shall berepaired by an approved method until a satisfactory test isobtained.7.5 Use or failure of this vacuum test shall not precludeacceptance by appropriate water infiltration o
15、r exfiltrationtesting, (see Practice C 969), or other means.8. Precision and Bias8.1 No justifiable statement is presently capable of beingmade either on the precision or bias of this procedure, since thetest result merely states whether there is conformance to thecriteria for the success specified.
16、9. Keywords9.1 acceptance criteria; concrete; manhole sections; testmethod; vacuum testAPPENDIX(Nonmandatory Information)X1. Air Testing for a Single Diameter PipeX1.1 The standard accepted method of air testing, for asingle diameter pipe, Practice C 924, allows a drop of 1 psipressure during the ti
17、me calculated by the formula:TPress.5KD2LQ(X1.1)where:T = time for 1 psi drop in pressureK = 0.00037 for in./lb unitsD = pipe diameter, in.L = length of line, ftQ = air loss, ft3/minX1.2 A pressure drop of 1 in. Hg for the vacuum testcompares to a pressure drop of 0.490 psi for the air test.1 in. Hg
18、 314.696 lb/in.229.02 1 Hg5 0.490 psi (X1.2)Therefore, the time relationship is:Tvac5 0.490 Tpress(X1.3)orTvac5Tpress2.04(X1.4)X1.3 The allowable test times cited in Practice C 924,Table 2, for pipe sizes 4 in. to 24 in. diameter are provided inTable X1.1 and Table X1.2. The allowable test times for
19、 sizesabove 24 in. were obtained by extrapolation. Therefore, usingthe appropriate Q. we find that:TABLE 1 Minimum Test Times for Various Manhole Diameters(30 120 in.) in SecondsDepth (ft)Diameter, in.30 33 36 42 48 54 60 66 72Time, in seconds4 6 7 7 9 10 12 13 15 166 9 10 11 13 15 18 20 22 25811124
20、1720232629310 14 15 18 21 25 29 33 36 4112 17 18 21 25 30 35 39 43 4914 20 21 25 30 35 41 46 51 5716 22 24 29 34 40 46 52 58 6718 25 27 32 38 45 52 59 65 7320 28 30 35 42 50 53 65 72 8122 31 33 39 46 55 64 72 79 8924 33 36 42 51 59 64 78 87 9726 36 39 46 55 64 75 85 94 10528 39 42 49 59 69 81 91 101
21、 11330 42 45 53 63 74 87 98 108 121TABLE 1 Minimum Test Times for Various Manhole Diameters(30 120 in.) in Seconds (continued)Depth (ft)Diameter, in.78 84 90 96 102 108 114 120Time, in seconds4 18 19 21 23 24 25 27 296 26293134363841438 353841454851545710 44 48 52 56 60 63 67 7112 53 57 62 67 71 76
22、81 8514 62 67 72 78 83 89 94 10016 70 76 83 89 95 101 108 11418 79 86 93 100 107 114 121 12820 88 95 103 111 119 126 135 14222 97 105 114 122 131 139 148 15624 106 114 124 133 143 152 161 17026 114 124 134 144 155 164 175 18528 123 133 145 155 167 177 188 19930 132 143 155 166 178 189 202 213C 1244
23、05ae12for 30 in. Q 5 7ft3/min!, Tvac5 0.00018D2QL 5 0.023 Lfor 36 in. Q 5 8ft3/min!, Tvac5 0.00018D2QL 5 0.029 Lfor 42 in. Q 5 9ft3/min!, Tvac5 0.00018D2QL 5 0.035 Lfor 48 in. Q 5 10 ft3/min!, Tvac5 0.00018D2QL 5 0.041 Lfor 54 in. Q 5 11 ft3/min!, Tvac5 0.00018D2QL 5 0.048 Lfor 60 in. Q 5 12 ft3/min
24、!, Tvac5 0.00018D2QL 5 0.054 Lfor 66 in. Q 5 13 ft3/min!, Tvac5 0.00018D2QL 5 0.060 Lfor 72 in. Q 5 14 ft3/min!, Tvac5 0.00018D2QL 5 0.067 Lfor 78 in. Q 5 15 ft3/min!, Tvac5 0.00018D2QL 5 0.073 Lfor 84 in. Q 5 16 ft3/min!, Tvac5 0.00018D2QL 5 0.079 Lfor 90 in. Q 5 17 ft3/min!, Tvac5 0.00018D2QL 5 0.
25、086 Lfor 96 in. Q 5 18 ft3/min!, Tvac5 0.00018D2QL 5 0.092 Lfor 102 in. Q 5 19 ft3/min!, Tvac5 0.00018D2QL 5 0.099 Lfor 108 in. Q 5 20 ft3/min!, Tvac5 0.00018D2QL 5 0.105 Lfor 114 in. Q 5 21 ft3/min!, Tvac5 0.00018D2QL 5 0.112 Lfor 120 in. Q 5 22 ft3/min!, Tvac5 0.00018D2QL 5 0.118 LC 1244 05ae13AST
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29、on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or
30、at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE X1.1 Minimum Test Times for Various Pipe Diameters(Practice C 924)Nominal Pipe Size, in. Time (T), min 100 ft.40.360781210 1.512 1.815 2.118 2.421 3.024 3.627 4.230 4.833 5.436 6.0TABLE X1.2 Allowable Air Loss for Various Pipe Diameters(Practice C 924)Nominal Pipe Size, in. Air Loss (Q), ft3/min42628210 2.512 315 418 521 5.524 630 736 842 948 1054 1160 1266 1372 14C 1244 05ae14
