1、Designation:E122290(Reapproved 2009)Standard Test Method forLaboratory Measurement of the Insertion Loss of PipeLagging Systems1This standard is issued under the fixed designation E1222;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision
2、,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of the inser-tion loss of pipe lagging systems under laboratory condit
3、ions.1.2 A procedure for accrediting a laboratory for purposes ofthis test method is given in Annex A1.1.3 This standard 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 heal
4、th practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C423 Test Method for SoundAbsorption and SoundAbsorp-tion Coefficients by the Reverberation Room MethodC634 Terminology Relating to Building and EnvironmentalAcousticsE90 Te
5、st Method for Laboratory Measurement of AirborneSound Transmission Loss of Building Partitions andElementsE548 Guide for General Criteria Used for Evaluating Labo-ratory Competence(Withdrawn 2002)32.2 ANSI Standards:S1.4 Specification for Sound Level Meters4S1.6 Preferred Frequencies and Band Number
6、s for Acousti-cal Measurements4S1.11 Specification for Octave Band and Fractional-Octave-Band Analog and Digital Filters43.Terminology3.1 DefinitionsThe acoustical terms used in this testmethod are consistent with Terminology C634.3.2 Definitions of Terms Specific to This Standard:3.2.1 pipe lagging
7、 systeman arrangement of noise insulat-ing materials used to cover a pipe to reduce noise radiatingfrom it.4.Summary of Test Method4.1 Noise is produced inside a steel pipe located within areverberation room using band-limited white noise as a testsignal.The noise must be produced by a loudspeaker o
8、racoustic driver located at one end of the pipe.Average soundpressure levels are measured within the reverberation room fortwo conditions,one with sound radiating from the bare pipeand the other with the same pipe covered with a laggingsystem.The insertion loss of the lagging system is thedifference
9、 in the sound pressure levels measured with soundradiating from the bare and lagged pipe,with an adjustment forchanges in room absorption due to the presence of the laggingsystem.The results may be obtained in a series of 100-Hz widebands or in one-third octave bands from 500 to 5000 Hz.Using100-Hz
10、wide bands will improve the signal-to-noise ratio in thereverberant room.This is frequently necessary when measur-ing specimens having high insertion loss.5.Significance and Use5.1 The insertion loss of a pipe lagging system dependsupon the lagging system materials,the method used to applythe materi
11、als,the pipe wall thickness,the size and shape of thebare and lagged pipe,and the mechanisms causing noiseradiation from the pipe.Insertion losses measured using thistest method should be used with some caution.In thelaboratory,measurements must be made under reproducibleconditions,but in practical
12、usage in the field,the conditionsthat determine the effective insertion loss are difficult to predictand they may lead to slightly different results.Insertion lossesmeasured with this test method can be used successfully foracoustical design purposes.Insertion losses measured with thistest method ar
13、e most useful for pipes and lagging systemswhich are similar to those used in the laboratory configuration.1This test method is under the jurisdiction ofASTM Committee E33 on Buildingand Environmental Acoustics and is the direct responsibility of SubcommitteeE33.08 on Mechanical and Electrical Syste
14、m Noise.Current edition approved April 1,2009.Published August 2009.Originallyapproved in 1990.Last previous edition approved in 2002 as E1222 90(2002).DOI:10.1520/E1222-90R09.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For An
15、nual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http
16、:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 This test method may be used to rank-order pipe laggingsystems according to insertion loss or to estimate the fieldinsertion loss of pipe lagging systems installed in the field.5.3 This test method assumes that pipe wall stresses result-ing from different methods of supporting the test pipe in thelaboratory do not have a significant effect upon the measuredinsertion lo
