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ASTM E1265-04(2021)

(Test Method)

Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers

Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers

SIGNIFICANCE AND USE
5.1 This test method permits the evaluation of both the acoustical and mechanical performance of pneumatic exhaust silencers designed for quieting compressed gas exhausts (usually air). The data can be used by manufacturers to assess or improve their products, or by users to select or specify a silencer. The data acquired using this measurement method allow for performance comparisons of competitive products and aid in the selection of an appropriate device.  
5.2 Flow rate is an important parameter to consider when the application involves machinery or equipment that requires compressed air or other gases to be exhausted rapidly. For example, in an automatic pneumatic press, compressed air must be exhausted rapidly to avoid a premature second cycle. For this reason, flow ratio is reported in addition to acoustical performance.
SCOPE
1.1 This test method covers the laboratory measurement of both the acoustical and mechanical performance of pneumatic exhaust silencers designed for quieting compressed gas (usually air) exhausts from orifices connected to pipe sizes up to 3/4 in. NPT. This test method is not applicable for exhausts performing useful work, such as part conveying, ejection, or cleaning. This test method evaluates acoustical performance using A-weighted sound level measurements.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 8.  
1.4 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

Status
Published
Publication Date
31-Dec-2020
ICS
17.140.01 - Acoustic measurements and noise abatement in general
Technical Committee
E33 - Building and Environmental Acoustics
Drafting Committee
E33.08 - Mechanical and Electrical System Noise
Current Stage
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ASTM E1265-04(2021) - Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust SilencersASTM E1265-04(2021) - Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers
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ASTM E1265-04(2021) - Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers
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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: E1265 − 04 (Reapproved 2021)
Standard Test Method for
1
Measuring Insertion Loss of Pneumatic Exhaust Silencers
This standard is issued under the fixed designation E1265; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope S1.13 Method for the Measurement of Sound Pressure
Levels
1.1 This test method covers the laboratory measurement of
S1.31 Precision Method for the Determination of Sound
both the acoustical and mechanical performance of pneumatic
PowerLevelsofBroad-BandNoiseSourcesinReverbera-
exhaust silencers designed for quieting compressed gas (usu-
tion Rooms
3
ally air) exhausts from orifices connected to pipe sizes up to ⁄4
S1.33 Engineering Methods for the Determination of Sound
in. NPT. This test method is not applicable for exhausts
Power Levels of Noise Sources in a Special Reverberation
performing useful work, such as part conveying, ejection, or
Room
cleaning. This test method evaluates acoustical performance
B2.1 Taper Pipe Thread (NPT)—Standard Designation for
using A-weighted sound level measurements.
Tapered Pipe Threads
1.2 The values stated in inch-pound units are to be regarded
2.3 Federal Standard:
as standard. The values given in parentheses are mathematical
RulesandRegulations—HandandPortablePowerToolsand
conversions to SI units that are provided for information only 4
Equipment
and are not considered standard.
3. Terminology
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1 Definitions—For definitions of terms used in this test
responsibility of the user of this standard to establish appro-
method, see Terminology C634. Particular terms of interest
priate safety, health, and environmental practices and deter-
are: sound level and average sound pressure level.
mine the applicability of regulatory limitations prior to use.
3.2 Definitions of Terms Specific to This Standard:
Specific precautionary statements are given in Section 8.
3.2.1 flow ratio—the ratio of gas flow with the pneumatic
1.4 This international standard was developed in accor-
exhaust silencer installed relative to flow of the unrestricted
dance with internationally recognized principles on standard-
pipe.
ization established in the Decision on Principles for the
3.2.2 flow resistance—the reduction of fluid flow caused by
Development of International Standards, Guides and Recom-
various restrictions, surface roughness, devious paths,
mendations issued by the World Trade Organization Technical
obstacles, etc. This term is sometimes referred to as “back
Barriers to Trade (TBT) Committee.
pressure.”
2. Referenced Documents 3.2.3 Discussion—For this test method back pressure is a
2 qualitative term, therefore, there is no need to measure.
2.1 ASTM Standards:
3.2.4 insertion loss of a pneumatic exhaust silencer (at a
C634 Terminology Relating to Building and Environmental
specific supply pressure)—the difference in average
Acoustics
3
A-weighted sound levels measured with and without the
2.2 ANSI Standards:
pneumatic exhaust silencer installed on an unrestricted or
S1.4 Specification for Sound Level Meters
“open” pipe.
3.2.5 Discussion —Insertion loss, as defined in this test
1
ThistestmethodisunderthejurisdictionofASTMCommitteeE33onBuilding
method, differs from the definition in Terminology C634.As
and Environmental Acoustics and is the direct responsibility of Subcommittee
E33.08 on Mechanical and Electrical System Noise.
stated in 1.1, this test method uses A-weighting rather than
Current edition approved Jan. 1, 2021. Published February 2021. Originally
discrete frequency bands. It compares a set of sound pressure
approved in 1988. Last previous edition approved in 2013 as E1265 – 04 (2013).
data measured in a reverberation room rather than determining
DOI: 10.1520/E1265-04R21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4
Standards volume information, refer to the standard’s Document Summary page on This United States Occupational Safety and HealthAdministration Regulation,
the ASTM website. Federal Register, Vol 36, Number 105, Part II, p. 10653, May 1971, is available
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., from Superintendent of Documents, Government Printing Office, Washington, DC
4th Floor, New York, NY 10036, http://www.ansi.org. 20402–
...

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4.1 Situations for which outdoor sound level data are required include, but are not limited to, comparison of sound levels with criteria or regulatory limits.  
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4.1 IEM Applications and Capabilities—IEM has been successfully applied to a wide range of NDT applications in the manufacture, maintenance, and repair of metallic and non-metallic parts. Examples of anomalies detected are discussed in 1.1 and 6.2. IEM has been proven to provide fast, cost-effective, and accurate NDT solutions in nearly all manufacturing, maintenance, or repair modalities. Examples of the successful application focuses include, but are not limited to: sintered powder metals, castings, forgings, stampings, ceramics, glass, wood, weldments, heat treatment, composites, additive manufacturing, machined products, and brazed products.  
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FIG. 3 Schematic of Impact Excitation Approach
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SIGNIFICANCE AND USE
3.1 Degradation in sensor performance can occur due to dropping, mechanical shock while mounted on the test structure, temperature cycles, and so forth. It is necessary and desirable to have a simple measurement procedure that will check the consistency of sensor response, while holding all other variables constant.  
3.2 While test blocks of many different kinds have been used for this purpose for many years, an acrylic polymer rod offers the best all-around combination of suitable acoustic properties, practical convenience, ease of procurement, and low cost.  
3.3 Because the acoustic properties of the acrylic rod are known to depend on temperature, this practice requires that the rod, sensors, and couplant be stabilized at the same working temperature, prior to application of the practice.  
3.4 Attention should be paid to storage conditions for the acrylic polymer rod. For example, it should not be left in a freezing or hot environment overnight, unless it is given time for temperature stabilization before use.  
3.5 Properly applied and with proper record keeping, this practice can be used in many ways, such as:  
3.5.1 To determine when a sensor is no longer suitable for use.  
3.5.2 To check sensors that have been exposed to high-risk conditions such as dropping, overheating, and so forth.  
3.5.3 To get an early warning of sensor degradation over time.  
3.5.4 To obtain matched sets of sensors and preamplifiers.  
3.5.5 To verify sensors quickly but accurately in the field, and to assist troubleshooting when a channel does not pass a performance check.
SCOPE
1.1 This practice is used for routinely checking the sensitivity of acoustic emission (AE) sensors. It is intended to provide a reliable, precisely specified way of comparing a set of sensors or telling whether an individual sensor's sensitivity has degraded during its service life, or both.  
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SCOPE
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SIGNIFICANCE AND USE
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4.2.3 Comparison of sound levels with criteria or regulatory limits (for example, indication of exceedance of criteria or non-compliance with laws).  
4.3 This test method provides a means for operating a sound analysis system which incorporates digital circuits for processing and storing sound level data, documenting conditions under which the measurements were performed, and reporting the results.  
4.4 This test method provides the user with information to (1) perform and document statistical analysis of outdoor sound level over specific time periods at specified places, and (2) make and document the physical observations necessary to qualify the measurements.  
4.5 This test method can be used by individuals, regulatory agencies, or others as a measurement method to collect acoustical data for many common situations. The data are collected in a format determined by the capabilities of the equipment, equipment operational options selected, and by post-processing options available.  
4.6 The user is cautioned that there are many factors that can strongly influence the resul...
SCOPE
1.1 This test method covers the measurement of outdoor sound levels at specific locations using a digital statistical sound analysis system and a formal measurement plan.  
1.1.1 This test method provides basic requirements for obtaining either a single set of data or multiple sets of related data. However, because there are numerous circumstances and varied objectives requiring multiple sets of data, the test method does not address planning of the measurement program.  
1.2 The use of results of measurements performed using this test method include, but are not limited to, the following:  
1.2.1 To characterize the acoustical environment of a site,  
1.2.2 To characterize the sound emissions of a specific sound source which exhibits a temporal variation in sound output, and  
1.2.3 To monitor the effectiveness of a noise impact mitigation plan.  
1.3 This test method is intended to be used in conjunction with a measurement plan that references this test method. Changes or additions to the provisions of this test method shall be clearly stated in the plan.  
1.3.1 In the event it is necessary, for example, because of time constraints, to conduct measurements without first formalizing a plan, this test method can be used if an operator/observer whose qualifications are satisfactory to both the performing organization and the client is present at all times during the measurements and who complies, to the extent possible, with all the applicable requirements of this test method, including record keeping.  
1.4 The data obtained using this test method enable comparison of sound level data with appropriate criteria.  
1.4.1 The data obtained with this test method can be used in the derivation of loudness levels provided the necessary requirements regarding sample duration and signal bandwidth are observed in collecting the data. It is recommended that a specialist in the area of loudness evaluation be consulted in p...

  • Standard
    12 pages
    English language
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  • Standard
    12 pages
    English language
    sale 15% off
ASTM
ASTM E1289-08(2022)(Specification)
Standard Specification for Reference Specimen for Sound Transmission Loss

ABSTRACT
This specification describes the construction and installation of standard reference specimens for quality control of laboratory sound transmission loss measurements. The reference specimen is composed of framed steel panels. The required materials for fabrication and installation are as follows: galvanized sheets, frame, and panels. Four kinds of installation may be done: Installation A using a single layer reference specimen, Installation B using double layer reference specimen with a common plate, Installation C using double layer reference specimen with separate plates-empty cavity, and Installation D using double layer reference specimen with separate plates and added layer of sound-absorbing material in the cavity.
SCOPE
1.1 This specification describes the construction and installation of standard reference specimens for quality control of laboratory sound transmission loss measurements using Test Method E90.  
1.2 Laboratories may choose to construct and test all of the reference specimens described here or only a subset. Specific specimens may be required by a test method or an accrediting agency.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
1.4 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.

  • Technical specification
    6 pages
    English language
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