ASTM E2024/E2024M-11(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E2024/E2024M − 11 (Reapproved 2019)
Standard Practice for
Atmospheric Leaks Using a Thermal Conductivity Leak
Detector
ThisstandardisissuedunderthefixeddesignationE2024/E2024M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2.2 ASNT Documents:
SNT-TC-1ARecommended Practice for Personnel Qualifi-
1.1 This practice covers procedures for detecting the
–5 3 –4 cation and Certification in Nondestructive Testing
sources of gas leaking at the rate of 1×10 Pa m /s (1×10
3 ANSI/ASNT CP-189Standard for Qualification and Certifi-
standard cm /s) or greater. The tests may be conducted on any
cation of Nondestructive Testing Personnel
object that can be pressurized with a tracer gas that is
2.3 AIA Standard:
detectable by a thermal conductivity detector. The test sensi-
NAS-410Certification and Qualification of Nondestructive
tivity will vary widely depending on the tracer gas used.
Test Personnel
1.2 Units—The values stated in either SI or std-cc/sec units
are to be regarded separately as standard. The values stated in
3. Terminology
each system may not be exact equivalents: therefore, each
3.1 Definitions—For definitions of terms used in these test
system shall be used independently of the other. Combining
methods, see Terminology E1316, Section E.
values from the two systems may result in non-conformance
with the standard.
4. Summary of Practice
1.3 This standard does not purport to address all of the
4.1 Scanning Method—This test method sets minimum
safety concerns, if any, associated with its use. It is the
requirements for a thermal conductivity leak detector. It
responsibility of the user of this standard to establish appro-
provides for calibration of the detector and gives procedures
priate safety, health, and environmental practices and deter-
for pressurizing the test object, locating leaks, and estimating
mine the applicability of regulatory limitations prior to use.
the leakage rate.
1.4 This international standard was developed in accor-
4.2 Accumulation Method—The accumulation method is
dance with internationally recognized principles on standard-
sometimes the only practical method for accessing complex
ization established in the Decision on Principles for the
shaped flanges or sections of pressurized vessels to be leak
Development of International Standards, Guides and Recom-
tested. It may be achieved by entrapping or enclosing an area
mendations issued by the World Trade Organization Technical
of a test component with a suitable covering and sampling the
Barriers to Trade (TBT) Committee.
buildup of tracer gas concentration with the thermal conduc-
tivity leak detector. The acceptance criteria is based on the
2. Referenced Documents
tracer gas concentration detected by the thermal conductivity
2.1 ASTM Standards:
detector after an accumulation time from leakage from the
E543Specification forAgencies Performing Nondestructive
leak(s) into the known sample volume.
Testing
E1316Terminology for Nondestructive Examinations
5. Significance and Use
5.1 These test methods are useful for locating and estimat-
ing the size of pressurized gas leaks, either as quality control
tests or as field inspection procedures. Also, they are valuable
This practice is under the jurisdiction of ASTM Committee E07 on Nonde-
as pretests before other more time consuming and more
structive Testing and is the direct responsibility of Subcommittee E07.08 on Leak
sensitive leak tests are employed. These test methods are
Testing Method.
semi-quantitative techniques used to locate leaks but cannot be
Current edition approved May 1, 2019. Published June 2019. Originally
approved in 1999. Last previous edition approved in 2011 as E2024/E2024M–11.
DOI: 10.1520/E2024_E2024M-11R19.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
Standards volume information, refer to the standard’s Document Summary page on Available fromAerospace IndustriesAssociation ofAmerica, Inc. (AIA), 1000
the ASTM website. WilsonBlvd.,Suite1700,Arlington,VA22209-3928,http://www.aia-aerospace.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E2024/E2024M − 11 (2019)
used to quantify except for approximation. These test methods 7.5 Operator Scanning Variations—The leak detector re-
may be used in an accept-reject test mode. sponse will change when the test operator varies the scanning
parameters because the scanning distance and speed deter-
6. Basis of Application mines the tracer gas concentration that the leak detector
measured.Anychangeinscanningparametersfromthoseused
6.1 The following items are subject to contractual agree-
for calibration may cause a reduction in test sensitivity and
ment between the parties using or referencing these test
instrument response.
methods:
7.6 Gas Compatibility—Some gases, such as hydrogen and
6.2 Personnel Qualification
ammonia,maypermanentlyaltertheinstrumentsensitivityand
6.2.1 If specified in the contractual agreement. Personnel
stability. Refer to the instrument manufacturer’s manual.
performing examinations to these test methods shall be quali-
fied in accordance with a nationally or internationally recog-
8. Apparatus
nized NDTpersonnel qualification practice or standard such as
8.1 Thermal Conductivity Leak Detector—This detector
ANSI/ASNT-CP-189,SNT-TC-1A,NAS-410,orsimilardocu-
–5
should have a minimum detectable leak rate of 1×10 Pa
ment and certified by the employer or certifying agency, as
3 –4 3
m /s(1×10 Stdcm /s).Toperformtestsasspecifiedinthese
applicable. The practice or standard used and its applicable
revision shall be identified in the contractual agreement. test methods, the detector should have the following minimum
features:
6.3 Qualification of Nondestructive Agencies—If specified
8.1.1 Thermal conductivity sensor.
in the contractual agreement, NDT agencies shall be qualified
8.1.2 Device to maintain a stable probe air velocity.
and evaluated as described in Specification E543. The appli-
8.1.3 Controls to zero detector.
cable edition of Specification E543 shall be specified in the
contractual agreement. 8.1.4 Battery status indicator for portable instruments. The
instrument sensitivity for a portable detector shall not vary
6.4 Re-examination of Repaired/Reworked Items—Re-
prior to a low battery indication.
examination of repaired/reworked items is not addressed in
these test methods, they shall be specified in the contractual 8.2 Standard Leaks of Both Fixed and Variable Type—The
agreement. leak rate of the standard leak (CL) used for the system
calibration shall be equal to the acceptance level (maximum
permissible leakage rate). T
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