ASTM E1265-04

Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers

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 3/4in. 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 the standard. The values given in parentheses are provided for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 8.

General Information

• Status: Historical
• Publication Date: 31-Jul-2004
• Technical Committee: E33 - Building and Environmental Acoustics
• Drafting Committee: E33.08 - Mechanical and Electrical System Noise

Relations

• Referred By: ASTM C634-22 - Standard Terminology Relating to Building and Environmental Acoustics
• Effective Date: 01-Aug-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E1265 − 04
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 S1.33 Engineering Methods for the Determination of Sound
Power Levels of Noise Sources in a Special Reverberation
1.1 This test method covers the laboratory measurement of
Room
both the acoustical and mechanical performance of pneumatic
B2.1 Taper Pipe Thread (NPT)—Standard Designation for
exhaust silencers designed for quieting compressed gas (usu-
Tapered Pipe Threads
3
ally air) exhausts from orifices connected to pipe sizes up to ⁄4
in. NPT. This test method is not applicable for exhausts 2.3 Federal Standard:
RulesandRegulations—HandandPortablePowerToolsand
performing useful work, such as part conveying, ejection, or
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cleaning. This test method evaluates acoustical performance Equipment
using A-weighted sound level measurements.
3. Terminology
1.2 The values stated in inch-pound units are to be regarded
3.1 Definitions—For definitions of terms used in this test
as the standard. The values given in parentheses are provided
method, see Terminology C634. Particular terms of interest
for information only.
are: sound level and average sound pressure level.
1.3 This standard does not purport to address all of the
3.2 Definitions of Terms Specific to This Standard:
safety concerns, if any, associated with its use. It is the
3.2.1 flow ratio—the ratio of gas flow with the pneumatic
responsibility of the user of this standard to establish appro-
exhaust silencer installed relative to flow of the unrestricted
priate safety and health practices and determine the applica-
pipe.
bility of regulatory limitations prior to use. Specific precau-
3.2.2 flow resistance—the reduction of fluid flow caused by
tionary statements are given in Section 8.
various restrictions, surface roughness, devious paths,
obstacles, etc. This term is sometimes referred to as “back
2. Referenced Documents
2 pressure.”
2.1 ASTM Standards:
3.2.3 Discussion—For this test method back pressure is a
C634 Terminology Relating to Building and Environmental
qualitative term, therefore, there is no need to measure.
Acoustics
3
3.2.4 insertion loss of a pneumatic exhaust silencer (at a
2.2 ANSI Standards:
specific supply pressure)—the difference in average
S1.4 Specification for Sound Level Meters
A-weighted sound levels measured with and without the
S1.13 Method for the Measurement of Sound Pressure
pneumatic exhaust silencer installed on an unrestricted or
Levels
“open” pipe.
S1.31 Precision Method for the Determination of Sound
PowerLevelsofBroad-BandNoiseSourcesinReverbera-
3.2.5 Discussion —Insertion loss, as defined in this test
tion Rooms
method, differs from the definition in Terminology C634.As
stated in 1.1, this test method uses A-weighting rather than
discrete frequency bands. It compares a set of sound pressure
1 data measured in a reverberation room rather than determining
ThistestmethodisunderthejurisdictionofASTMCommitteeE33onBuilding
and Environmental Acoustics and is the direct responsibility of Subcommittee
absolute sound power levels. This test method is intended to
E33.08 on Mechanical and Electrical System Noise.
assess the difference in sound regenerated at the pipe orifice
Current edition approved Aug. 1, 2004. Published August 2004. Originally
ε1 and does not evaluate sound propagating along the pipe
approved in 1988. Last previous edition approved in 1995 as E1265 – 90 (1995) ,
interior.
which was withdrawn July 2004 and reinstatedAugust 2004. DOI: 10.1520/E1265-
04.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. 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. FederalRegister,Vol36,Number105,PartII,p.10653,May1971,isavailablefrom
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., Superintendent of Documents, Government Printing Office, Washington, DC
4th Floor, New York, NY 10036. 20402–9371.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E1265 − 04
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NOTE 1—Reverberation rooms as small as 17 m are sufficient for
3.2.6 pneumatic exhaust silencer—a device attached to a
making A-weighted measurements of noise generated by pneumatic
pipe
...