1、Designation: C1244M 11Standard Test Method forConcrete Sewer Manholes by the Negative Air Pressure(Vacuum) Test Prior to Backfill (Metric)1This standard is issued under the fixed designation C1244M; the number immediately following the designation indicates the year oforiginal adoption or, in the ca
2、se of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers procedures for testing precastconcrete manhole sections when using
3、 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 intended to be used as a preliminarytest to enable the inst
4、aller to demonstrate the condition of theconcrete manholes prior to backfill. Users are hereby cautionedthat misuse or misapplication of the test criteria containedherein can cause permanent damage to the system being tested.NOTE 1Vacuum test criteria presented in this test method are similarto thos
5、e in general use. The test and criteria have been widely andsuccessfully used in testing manholes.NOTE 2It should be understood that no correlation has been foundbetween vacuum (air) and hydrostatic tests.1.3 This test method is the companion to inch-pound TestMethod C1244.1.4 This standard does not
6、 purport to address all of thesafety problems, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards
7、:2C822 Terminology Relating to Concrete Pipe and RelatedProductsC924 Practice for Testing Concrete Pipe Sewer Lines byLow-Pressure Air Test MethodC969 Practice for Infiltration and Exfiltration AcceptanceTesting of Installed Precast Concrete Pipe Sewer LinesC1244 Test Method for Concrete Sewer Manho
8、les by theNegative Air Pressure (Vacuum) Test Prior to Backfill3. Terminology3.1 For definitions of terms relating to manholes, seeTerminology C822.4. 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 t
9、ime period is used 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
10、the manhole shall 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 33.8 kPa of Hg shall
11、 be drawn on themanhole, the valve on the vacuum line of the test head closed,and the vacuum pump shut off. The time shall be measured forthe vacuum to drop to 30.4 kPa of Hg.1This test method is under the jurisdiction of ASTM Committee C13 onConcrete Pipe and is the direct responsibility of Subcomm
12、ittee C13.06 on Manholesand Specials.Current edition approved Nov. 1, 2011. Published November 2011. Originallyapproved in 1993. Last previous edition approved in 2005 as C1244M 05a1.DOI: 10.1520/C1244M-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer
13、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 Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.3 The manhole shall pass if the time f
14、or the vacuumreading to drop from 33.8 kPa of Hg to 30.4 kPa of Hg meetsor exceeds the values indicated in Table 1.7.4 If the manhole fails the initial test, necessary repairsshall be made by an approved method. The manhole shall thenbe retested until a satisfactory test is obtained.7.5 Use or failu
15、re of this vacuum test shall not precludeacceptance by appropriate water infiltration or exfiltrationtesting, (see Practice C969), or other means.8. Precision and Bias8.1 No justifiable statement can be made either on theprecision or bias of this procedure, since the test result merelystates whether
16、 there is conformance to the criteria for thesuccess specified.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 pip
17、e, Practice C924, allows a drop of 3.4 kPapressure during the time calculated by the formula:Tpress5KD2LQwhere:T = time for drop in pressure of 3.4 kPaK = 5.3 3 108for SI unitsD = inside pipe diameter, mmL = length of line, mQ = air loss, m3/minX1.2 A pressure drop of 3.4 kPa of Hg for the vacuum te
18、stcompares to a pressure drop of 3.4 kPa of Hg for the air test.19 Hg 5 3.376 850 kPaTherefore, the time relationship is:Tvac5 3.4 TpressorTvac5Tpress.294X1.3 The allowable test times cited in Practice C924,Table 2, for pipe sizes 100 to 600 mm diameter are shown inTable X1.1 and Table X1.2. The all
19、owable test times for sizesabove 600 mm were obtained by extrapolation. Therefore,using the appropriate Q. we find that:TABLE 1 Minimum Test Times for Various Manhole Diameters(7503000 mm) in SecondsDepth, mDiameter, mm750 825 900 1050 1200 1350 1500 1650 1800Time, in seconds1.2677910121315161.8 9 1
20、0 11 13 15 18 20 22 252.4 11 12 14 17 20 23 26 29 333.0 14 15 18 21 25 29 33 36 413.7 17 18 21 25 30 35 39 43 494.3 20 21 25 30 35 41 46 51 574.9 22 24 29 34 40 46 52 58 675.5 25 27 32 38 45 52 59 65 736.1 28 30 35 42 50 53 65 72 816.7 31 33 39 46 55 64 72 79 897.3 33 36 42 51 59 64 78 87 977.9 36 3
21、9 46 55 64 75 85 94 1058.5 39 42 49 59 69 81 91 101 1139.1 42 45 53 63 74 87 98 108 121TABLE 1 Minimum Test Times for Various Manhole Diameters(7503000 mm) in Seconds (continued)Depth, mDiameter, mm1950 2100 2250 2400 2550 2700 2850 3000Time, in seconds1.21819212324252729.826234363841432.43538415485
22、154573.04452660636771.7535767717681854.3 62 67 72 78 83 89 94 1004.9 70 76 83 89 95 101 108 1145.5 79 86 93 100 107 114 121 1286.1 88 95 103 111 119 126 135 1426.7 97 105 114 122 131 139 148 1567.3 106 114 124 133 143 152 161 1707.9 114 124 134 144 155 164 175 1858.5 123 133 145 155 167 177 188 1999
23、.1 132 143 155 166 178 189 202 213C1244M 112for 750 mm Q 5 .20 m3/min!, Tvac5 2.6 3 1027D2QL 5 .073 Lfor 825 mm Q 5 .22 m3/min!, Tvac5 2.6 3 1027D2QL 5 .080 Lfor 1050 mm Q 5 .25 m3/min!, Tvac5 2.6 3 1027D2QL 5 .115 Lfor 1200 mm Q 5 .28 m3/min!, Tvac5 2.6 3 1027D2QL 5 .134 Lfor 1350 mm Q 5 .31 m3/min
24、!, Tvac5 2.6 3 1027D2QL 5 .153 Lfor 1500 mm Q 5 .34 m3/min!, Tvac5 2.6 3 1027D2QL 5 .172 Lfor 1650 mm Q 5 .37 m3/min!, Tvac5 2.6 3 1027D2QL 5 .191 Lfor 1800 mm Q 5 .40m3/min!, Tvac5 2.6 3 1027D2QL 5 .211 Lfor 1950 mm Q 5 .42m3/min!, Tvac5 2.6 3 1027D2QL 5 .233 Lfor 2100 mm Q 5 .45m3/min!, Tvac5 2.6
25、3 1027D2QL 5 .253 Lfor 2250 mm Q 5 .48m3/min!, Tvac5 2.6 3 1027D2QL 5 .273 Lfor 2400 mm Q 5 .51m3/min!, Tvac5 2.6 3 1027D2QL 5 .294 Lfor 2550 mm Q 5 .54m3/min!, Tvac5 2.6 3 1027D2QL 5 .314 Lfor 2700 mm Q 5 .57m3/min!, Tvac5 2.6 3 1027D2QL 5 .335 Lfor 2850 mm Q 5 .59m3/min!, Tvac5 2.6 3 1027D2QL 5 .3
26、55 Lfor 3000 mm Q 5 .62m3/min!, Tvac5 2.6 3 1027D2QL 5 .376 LC1244M 113ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of
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31、/).TABLE X1.1 Minimum Test Times for Various Pipe Diameters(Practice C924)Nominal Pipe Size, mm Time (T), min/100 m100 0.9150 2.0200 3.5250 4.7300 6.0375 6.8450 7.7525 9.7600 11.0675 13.0750 15.0825 17.0900 19.0TABLE X1.2 Allowable Air Loss for Various Pipe Diameters(Practice C924)Nominal Pipe Size, mm Air Loss (Q), m3/min100 0.6150 0.6200 0.6250 0.7300 0.8375 0.11450 0.14525 0.15600 0.17750 0.20825 0.221050 0.251200 0.281350 0.311500 0.341650 0.371800 0.40C1244M 114
