ASTM A1047 A1047M-2005(2009) Standard Test Method for Pneumatic Leak Testing of Tubing《管道的气压泄漏标准试验方法》.pdf
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1、Designation: A1047/A1047M 05 (Reapproved 2009)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 la
2、st revision. 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 involvesme
3、asuring the 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
4、beequivalent for 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 This stan
5、dard 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 prior to use.1.4 The values stated in eit
6、her SI units 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.1.4.1 Within th
7、e text, the SI units are shown in brackets.2. Referenced Documents2.1 ASTM Standards:2A1016/A1016M Specification for General Requirementsfor Ferritic Alloy Steel, Austenitic Alloy Steel, and Stain-less Steel Tubes3. Terminology3.1 DefinitionsThe definitions in Specification A1016/A1016M are applicab
8、le to this test method.3.2 Definitions of Terms Specific to This Standard:3.2.1 actual starting pressure (P0actual)the actual star-ing pressure at time zero on each test cycle.3.2.2 calibration holea device (such as a crimped capil-lary, or a tube containing a hole produced by laser drilling)certifi
9、ed to be of the specified diameter.3.2.3 control volumefixed volume that is pressurized tocompare against an identical pressure contained in one tubeunder test.3.2.4 electronic control device (ECD)an electronic sys-tem to accumulate input from limit switches and transmittersproviding corresponding o
10、utputs to solenoid valves, acousticalarm devices, and visual displays3.2.5 pressure change (DP)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
11、 inpressure, either between two tubes, a tube and a 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 start
12、ing pressure (P0)the test starting pressure set inthe test 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 th
13、at must becrossed to determine reject status. PT= P0actual DP forpressure decay, and PT= P0actual + DP for vacuum decay.4. Summary of Test Method4.1 Procedure A, Pressure Differential, measures the drop inpressure over time as a result of air escaping from inside onetube when compared to another tub
14、e at an identical pressure, orone tube against a control volume at identical pressure. (SeeRefs (1) and (2)1This test method is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.10 on Stainless and Alloy Steel
15、 Tubular Products.Current edition approved Oct. 1, 2009. Published February 2010. Originallyapproved in 2005. Last previous edition approved in 2005 as A1047/A1047M 05.DOI: 10.1520/A1047_A1047M-05R09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Servic
16、e 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.4.2 Procedure B, Pressure Decay, measures the
17、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 and Use5.1 When permitted by a specification or the order,
18、 this testmethod may be used for detecting leaks in tubing in lieu of theair underwater pressure test.6. Apparatus6.1 An electronic control device (ECD) controls all opera-tions of the test method by accepting inputs from limit switchesand transmitters, and by providing corresponding pass/failoutput
19、s to solenoid valves, acoustic alarm devices, and visualdisplays. The pass/fail determination is achieved by a compari-son of the data input from pressure transducers with a standardaccept/reject criterion measured over the set test time.6.2 The test apparatus may have the capability for single- orm
20、ulti-tube testing. It shall be designed to detect a smallpredetermined pressure change during the testing cycle. It isintended that the apparatus be fully automated and equippedwith suitable instrumentation for the purpose of the test. Thisinstrumentation may include, but is not limited to the follo
21、w-ing:6.2.1 Internal transducers for calibration tests,6.2.2 Differential pressure and leak rate diagnosis,6.2.3 Control panel display for reporting digital or analogoutputs,6.2.4 Absolute or differential pressure transducers, or both,6.2.5 Internal timing device,6.2.6 Failure lamps, and6.2.7 Automa
22、tic shutdown capability.7. Hazards7.1 WarningIn addition to other precautions, high pres-sure air is employed during the testing process.8. Calibration8.1 Apparatus calibration shall be performed using a refer-ence standard, with adjustments of Starting Pressure (P0),Pressure Change (DP), and test t
23、ime. Test time is dependentupon starting pressure, allowed pressure change, tube internalvolume, hole diameter, and is calculated using the equation inAppendix X1. Actual test time may be longer than thecalculated value and shall be adjusted as necessary for theapparatus to cross the threshold press
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