1、Designation:A1047/A1047M05(Reapproved 2014)Standard Test Method forPneumatic Leak Testing of Tubing1This standard is issued under the fixed designation A1047/A1047M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last rev
2、ision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method provides procedures for the leak testingof tubing using pneumatic pressure.This test method involvesmeasuring the
3、change in pressure inside the tubing over time.There are three procedures that may be used,all of which areintended to be equivalent.It is a qualitative not a quantitativetest method.Any of the three procedures are intended to becapable of leak detection and,as such,are intended to beequivalent for
4、that purpose.1.2 The procedures will produce consistent results uponwhich acceptance standards can be based.This test may beperformed in accordance with the Pressure Differential(Pro-cedure A),the Pressure Decay(Procedure B),or the VacuumDecay(Procedure C)method.1.3 The values stated in either SI un
5、its or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3.1 Within the text,the SI
6、 units are shown in brackets.1.4 This standard does not 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 pr
7、ior to use.2.Referenced Documents2.1 ASTM Standards:2A1016/A1016M Specification for General Requirements forFerritic Alloy Steel,Austenitic Alloy Steel,and StainlessSteel Tubes3.Terminology3.1 DefinitionsThe definitions in Specification A1016/A1016M are applicable to this test method.3.2 Definitions
8、 of Terms Specific to This Standard:3.2.1 actual starting pressure(P0actual)the actual start-ing pressure at time zero on each test cycle.3.2.2 calibration holea device(such as a crimpedcapillary,or a tube containing a hole produced by laser drilling)certified to be of the specified diameter.3.2.3 c
9、ontrol volumefixed volume that is pressurized tocompare against an identical pressure contained in one tubeunder test.3.2.4 electronic control device(ECD)an electronic systemto accumulate input from limit switches and transmittersproviding corresponding outputs to solenoid valves,acousticalarm devic
10、es,and visual displays3.2.5 pressure change(P)the smallest pressure changein a tube,reliably detected by a pressure sensitive transmitter.3.2.6 pressure sensitive transmitterspressure measuringand signaling devices that detect extremely small changes inpressure,either between two tubes,a tube and a
11、controlvolume,or a tube and the ambient atmosphere.3.2.7 reference standarda tube or container containing acalibration hole.The calibration hole may either be in a fulllength tube,or in a short device attached to the tube orcontainer.3.2.8 starting pressure(P0)the test starting pressure set inthe te
12、st apparatus ECD.3.2.9 theoretical holea hole that will pass air at a theo-retical rate as defined by the equations given inAppendix X1.2.3.2.10 threshold pressure(PT)test ending pressure limitafter the allowed test time;the pressure value that must be1This test method is under the jurisdiction of A
13、STM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.10 on Stainless and Alloy Steel Tubular Products.Current edition approved March 1,2014.Published March 2014.Originallyapproved in 2005.Last previous edition approved in 2009 as A1047/A10
14、47M 05(2009).DOI:10.1520/A1047_A1047M-05R14.2For 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.Copyright ASTM Interna
15、tional,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1Copyright by ASTM Intl(all rights reserved);crossed to determine reject status.PT=P0actual P forpressure decay,and PT=P0actual+P for vacuum decay.4.Summary of Test Method4.1 Procedure A,Pressure Differential,measu
16、res the drop inpressure over time as a result of air escaping from inside onetube when compared to another tube at an identical pressure,orone tube against a control volume at identical pressure.(SeeRefs(1)and(2).)34.2 Procedure B,Pressure Decay,measures the drop inpressure over time as a result of air escaping from the tube.4.3 Procedure C,Vacuum Decay,involves evacuating thetubing to suitably low pressure and measuring the increase inpressure caused by gas entering the tubing.5.Significance an
