ASTM E499/E499M-11(2017)
(Practice)Standard Practice for Leaks Using the Mass Spectrometer Leak Detector in the Detector Probe Mode
Standard Practice for Leaks Using the Mass Spectrometer Leak Detector in the Detector Probe Mode<rangeref></rangeref >
SIGNIFICANCE AND USE
6.1 Test Method A is frequently used to test large systems and complex piping installations that can be filled with a trace gas. Helium is normally used. The test method is used to locate leaks but cannot be used to quantify except for approximation. Care must be taken to provide sufficient ventilation to prevent increasing the helium background at the test site. Results are limited by the helium background and the percentage of the leaking trace gas captured by the probe.
6.2 Test Method B is used to increase the concentration of trace gas coming through the leak by capturing it within an enclosure until the signal above the helium background can be detected. By introducing a calibrated leak into the same volume for a recorded time interval, leak rates can be measured.
SCOPE
1.1 This practice covers procedures for testing and locating the sources of gas leaking at the rate of 1 × 10 −7 Pa m3/s (1 × 10−8 Std cm3/s)3 or greater. The test may be conducted on any device or component across which a pressure differential of helium or other suitable tracer gas may be created, and on which the effluent side of the leak to be tested is accessible for probing with the mass spectrometer sampling probe.
1.2 Two test methods are described:
1.2.1 Test Method A—Direct probing, and
1.2.2 Test Method B—Accumulation.
1.3 Units—The values stated in either SI or std-cc/sec units are to be regarded separately as standard. The values stated in each system may not be exact equivalents: therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.5 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.
General Information
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Standards Content (Sample)
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: E499/E499M − 11 (Reapproved 2017)
Standard Practice for
Leaks Using the Mass Spectrometer Leak Detector in the
1,2
Detector Probe Mode
This standard is issued under the fixed designation E499/E499M; the number immediately following the designation indicates the year
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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Referenced Documents
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2.1 ASTM Standards:
1.1 This practice covers procedures for testing and locating
−7 3
E1316Terminology for Nondestructive Examinations
the sources of gas leaking at the rate of 1×10 Pa m /s
−8
3 3
2.2 Other Documents:
(1×10 Std cm /s) or greater. The test may be conducted on
SNT-TC-1A Recommended Practice for Personnel Qualifi-
any device or component across which a pressure differential
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cation and Certification in Nondestructive Testing
of helium or other suitable tracer gas may be created, and on
ANSI/ASNT CP-189ASNT Standard for Qualification and
which the effluent side of the leak to be tested is accessible for
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Certification of Nondestructive Testing Personnel
probing with the mass spectrometer sampling probe.
1.2 Two test methods are described:
3. Terminology
1.2.1 Test Method A—Direct probing, and
3.1 Definitions—For definitions of terms used in this
1.2.2 Test Method B—Accumulation. standard, see Terminology E1316, Section E.
1.3 Units—The values stated in either SI or std-cc/sec units
4. Summary of Practice
are to be regarded separately as standard. The values stated in
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4.1 Section1.8oftheLeakageTestingHandbook willbeof
each system may not be exact equivalents: therefore, each
value to some users in determining which leak test method to
system shall be used independently of the other. Combining
use.
values from the two systems may result in non-conformance
4.2 The test methods covered in this practice require a leak
with the standard.
−6 3
detector with a full-scale readout of at least 1×10 Pa m /s
−7
1.4 This standard does not purport to address all of the
3 3
(1×10 Std cm /s) on the most sensitive range, a maximum
safety concerns, if any, associated with its use. It is the
1-mindriftofzeroandsensitivityof 65%offullscaleonthis
responsibility of the user of this standard to establish appro-
range, and 62% or less on others (see 7.1). The above
priate safety and health practices and determine the applica-
sensitivities are those obtained by probing an actual standard
bility of regulatory limitations prior to use.
leak in atmosphere with the detector, or sampling, probe, and
1.5 This international standard was developed in accor-
not the sensitivity of the detector to a standard leak attached
dance with internationally recognized principles on standard-
directly to the vacuum system.
ization established in the Decision on Principles for the
4.3 Test Method A, Direct Probing (see Fig. 1), is the
Development of International Standards, Guides and Recom-
simplest test, and may be used in parts of any size, requiring
mendations issued by the World Trade Organization Technical
only that a tracer gas pressure be created across the area to be
Barriers to Trade (TBT) Committee.
tested, and the searching of the atmospheric side of the area be
with the detector probe. This test method detects leakage and
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This practice is under the jurisdiction of ASTM Committee E07 on Nonde-
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structive Testing and is the direct responsibility of Subcommittee E07.08 on Leak For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Testing Method. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
CurrenteditionapprovedJune1,2017.PublishedJuly2017.Originallyapproved Standards volume information, refer to the standard’s Document Summary page on
in 1973. Last previous edition approved in 2011 as E499-11. DOI: 10.1520/E0499 the ASTM website.
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_E0499M-11R17. AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
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(Atmospheric pressure external, pressure above atmospheric internal). This 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
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document covers the Detector Probe Mode described in Guide E432. Marr,J.William,“LeakageTestingHandbook,”preparedforLiquidPropulsion
3
The gas temperature is referenced to 0°C. To convert to another gas reference Section,JetPropulsionLaboratory,NationalAeronauticsandSpaceAdministration,
temperature, T , multiply the leak rate by (T +273) ⁄273. Pasadena, CA, Contract NAS 7-396, June 1961.
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