1、Designation:C82811(Reapproved 2016)Standard Test Method forLow-Pressure Air Test of Vitrified Clay Pipe Lines1This standard is issued under the fixed designation C828;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method defines procedures for test
3、ing vitrifiedclay pipe lines,using low-pressure air,to demonstrate theintegrity of the installed line.Refer to Practice C12.1.2 This test method shall be performed on lines afterconnection laterals,if any,have been plugged and bracedadequately to withstand the test pressure,and after the trencheshav
4、e been backfilled for a sufficient time to generate asignificant portion of the ultimate trench load on the pipe line.The time between completion of the backfill operation andlow-pressure air testing shall be determined by the approvingauthority.1.3 This test method may also be used as a preliminary
5、 test,which enables the installer to demonstrate the condition of theline prior to backfill and further construction activities.1.4 This test method is suitable for testing gravity-flowsewer pipe constructed of vitrified clay or combinations of clayand other pipe materials.1.5 Terminology C896 is to
6、 be used for clarification ofterminology in this test method.1.6 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.7 This standard does no
7、t purport to address all of thesafety concerns,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:2C
8、12 Practice for Installing Vitrified Clay Pipe LinesC1091 Test Method for Hydrostatic Infiltration Testing ofVitrified Clay Pipe LinesC896 Terminology Relating to Clay Products3.Summary of Test Method3.1 The section of the line to be tested is plugged.Air,at lowpressure,is introduced into the plugge
9、d line.The line passesthe test if the rate of air loss,as measured by pressure drop,does not exceed a specified amount in a specified time.Thismay be determined by the use of Table 1,or calculated by useof the formulas in Appendix X1.4.Hazards4.1 The low-pressure air test may be dangerous to personn
10、elif,through lack of understanding or carelessness,a line isover-pressurized or plugs are installed improperly.It is ex-tremely important that the various plugs be installed so as toprevent the sudden expulsion of a poorly installed or partiallyinflated plug.As an example of the hazard,a force of 25
11、0 lbf(1110 N)is exerted on an 8-in.(205-mm)plug by an internalpressure of 5 psi(35 kPa).Observe the following safetyprecautions:4.1.1 No one shall be allowed in the manholes during testingbecause of the hazards.4.1.2 Install all plugs securely.4.1.3 When lines are to be tested,it may be necessary th
12、atthe plugs be braced as an added safety factor.4.1.4 Do not over-pressurize the lines.5.Preparation of the Line5.1 Air may pass through the walls of dry pipe.A wettedinterior pipe surface is desirable and will produce more1This test method is under the jurisdiction ofASTM Committee C04 on Vitrified
13、Clay Pipe and is the direct responsibility of Subcommittee C04.20 on Methods ofTest and Specifications.Current edition approved Nov.1,2016.Published November 2016.Originallyapproved in 1975.Last previous edition approved in 2011 as C828-11.DOI:10.1520/C0828-11R16.2For referenced ASTM standards,visit
14、 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United
15、States1 consistent test results.Usually moisture absorbed from thebackfill is sufficient to cope with this situation.Wherepractical,clean the line prior to testing to wet the pipe surfaceand eliminate debris.6.Procedure6.1 Determine the test time for the section of line to betested using Table 1 or
16、Table X1.1 or the formulas in AppendixX1.6.2 Plug all openings in the test section.6.3 Add air until the internal pressure of the line is raised toapproximately 4.0 psi(28 kPa).After this pressure is reached,allow the pressure to stabilize.The pressure will normally dropas the air temperature stabilizes.This usually takes 2 to 5 min,depending on the pipe size.The pressure should be reduced to3.5 psi(24 kPa)before starting the test.6.4 Start the test when the pressure is at 3.5 psi(24 kPa).Ifa 1
