1、Designation: C302 95 (Reapproved 2007)C302 13Standard Test Method forDensity and Dimensions of Preformed Pipe-Covering-TypeThermal Insulation1This standard is issued under the fixed designation C302; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase of revision, 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 Thi
3、s test method covers the determination of the dimensions and density, after conditioning, of preformed pipe insulation.1.1.1 Procedure A is applicable to sections of one-piece pipe covering or to sections of segmental pipe covering that can bejoined together concentrically and measured as one-piece.
4、1.1.2 Procedure B is applicable to segmental pipe covering where each section of material is measured.1.1.3 Procedure C is applicable to sections of one-piece pipe covering, such as soft foam or mineral wool materials, where itis possible to penetrate the material.1.2 The values stated in inch-pound
5、 units are to be regarded as the standard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and healt
6、h practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C167 Test Methods for Thickness and Density of Blanket or Batt Thermal InsulationsC168 Terminology Relating to Thermal InsulationC670 Practice for Preparing Precision and Bias
7、 Statements for Test Methods for Construction MaterialsC870 Practice for Conditioning of Thermal Insulating MaterialsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method3. Terminology3.1 DefinitionsSee Terminology C168.4. Summary of Test Method4.1 The mat
8、erial to be tested is conditioned to constant weight. The density of the pipe insulation is calculated from theconditioned mass and measured dimensions.5. Significance and Use5.1 Density measurements of preformed pipe insulation are useful in determining compliance of a product with specificationlim
9、its and in providing a relative gage of product weights. For any one kind of insulation some important physical and mechanicalproperties, such as thermal conductivity, heat capacity, strength, etc., bear a specific relationship with its density; however, on adensity basis, these properties are not d
10、irectly comparable with those for other kinds of material.1 This test method is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.32 on MechanicalProperties.Current edition approved March 1, 2007Nov. 1, 2013. Published April 2007D
11、ecember 2013. Originally approved in 1952. Last previous edition approved in 20012007as C302 95 (Reapproved 2001)(2007). 1. DOI: 10.1520/C0302-95R07.10.1520/C0302-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Bo
12、ok of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be techn
13、ically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO B
14、ox C700, West Conshohocken, PA 19428-2959. United States15.2 The physical dimensions of preformed pipe insulation are important quantities not only for determining the density of thepipe insulation but also for determining the conformance to specifications. The use of multilayer insulations is commo
15、n, and thedimensions are necessary to ensure proper nesting of the layers.6. Apparatus6.1 Flexible Steel Rule, graduated in 132-in. or 1.0-mm intervals.6.2 Scale, with sufficient capacity to weigh the specimen to within 0.01 lb or 5 g.6.3 Pin Probe, as defined in Test Methods C167.6.4 Steel Rule, gr
16、aduated in 132-in. or 1.0-mm intervals.6.5 Stainless Steel Shim Stock, 2 in. (75 mm) wide, longer than the circumference of the pipe insulation, and 0.010 in. (0.25mm) thick.6.6 Pi Tape, graduated to read a diameter directly to the nearest 132 in. or 1.0 mm.6.7 Pieces of Pipe, on which to install th
17、e pipe insulation under test (only required for Procedure 3).7. Test Specimen7.1 The test specimen shall be of a commercial size.7.2 If sectional pipe segments are to be used for Procedures 1 or 3, the sections shall be joined together to form a hollowcylinder.8. Conditioning8.1 Remove any jacket on
18、 the specimen unless it is of a type that would cause disintegration of the specimen upon removal.8.2 Condition the specimen to constant mass in accordance with Practice C870.9. ProceduresProcedure A9.1 One-Piece Pipe Section:9.1.1 Weigh the conditioned pipe section to the nearest 0.01 lb or 5 g.9.1
19、.2 Measure the length of the specimen in six locations, uniformly spaced around its circumference, to the nearest 132 in. or1.0 mm.C302 1329.1.3 Measure the circumference of the specimen in six locations, uniformly spaced along its length, to the nearest 132 in. or1.0 mm.9.1.4 Measure the wall thick
20、ness at six locations, uniformly spaced, three on each end of the specimen, to the nearest 132 in.or 1.0 mm.Procedure B9.2 Segmental Pipe Sections:9.2.1 Weigh the conditioned segmental pipe section to the nearest 0.01 lb or 5 g.9.2.2 Measure the length of the arc formed by the outer surface of the s
21、pecimen at six locations, uniformly spaced along itslength, to the nearest 132 in. or 1.0 mm.9.2.3 Measure the length of the arc formed by the inner surface of the specimen at six locations, uniformly spaced along itslength, to the nearest 132 in. or 1.0 mm.9.2.4 Measure the length of the specimen i
22、n six locations, uniformly spaced around the outer surface, to the nearest 132 in. or1.0 mm.9.2.5 Measure the wall thickness at six locations, uniformly spaced, one on each end and two on each side of the specimen, tothe nearest 132 in. or 1.0 mm.Procedure C9.3 Non-Rigid Pipe Insulations:9.3.1 Weigh
23、 the conditioned pipe section to the nearest 0.01 lb or 5 g.9.3.2 Place the insulation on a pipe of the same outside diameter as the nominal inside diameter of the specimen, and tie in place.Support the ends of the pipe such that the specimen is not resting on a surface.9.3.3 Measure the length of t
24、he specimen in six locations, uniformly spaced around its circumference, to the nearest 132 in. or1.0 mm.9.3.4 Measure the diameter of the specimen in six locations, uniformly spaced along its length, to the nearest 132 in. or 1.0 mm,using the Pi tape. In order to avoid compressing the insulation sp
25、ecimens under the Pi tape, wrap the shim stock around thespecimen and use the Pi tape over the shim stock. Subtract twice the thickness of the shim stock from the diameter measured andconvert the diameter to a circumference by multiplying the average diameter by pi.9.3.5 Measure the wall thickness a
26、t six locations, uniformly spaced along the length of the specimen and uniformly spacedaround its surface, using the pin probe of 6.3, to the nearest 132 in. or 1.0 mm.10. Calculations10.1 Calculate the volume of the specimen using one of the following equations:10.1.1 Procedures A and C:V 5LtC2pit!
27、/1728 (1)where:V = volume of the specimen, ft3,L = average length of the specimen, in.,t = average thickness of the specimen, in., andC = average circumference of the specimen, in.orV 5LtC2pit!31029 (2)where:V = is in m3, and L, t, and C are in mm.NOTE 1If the jacket is not removed before measuring
28、the outer circumference, deduct twice the jacket thickness times pi from the measuredcircumference.10.1.2 Procedure B:V 5LtAo1Ai!/3456 (3)where:V = volume of the specimen, ft3,C302 133L = average length of the specimen, in.,t = average thickness of the specimen, in.,Ao = average outer arc length of
29、the specimen, in., andAi = average inner arc length of the specimen, in.orV 512 Lt Ao1Ai! X 1029 (4)where:V = is in m3 and,L, T, Ao, and AI = are in mm.10.2 Calculate the density of the specimen from the conditioned mass and the calculated volume, volume as follows, andexpress the results in pounds
30、per cubic foot or kilograms per cubic metre.Density,lbft35masslb!Vft3! (5)orDensity,kgm35massg!1000Vm3! (6)NOTE 2If the jacket was not removed before weighing and measuring, deduct the mass of the jacket from the specimen mass. If the specimen willbe used for additional testing, a jacket from a spec
31、imen from the same sample will have to be sacrificed to measure the mass per lineal foot of the jacket.11. Report11.1 Report the following information:11.1.1 The average dimensions of the pipe insulation,11.1.2 The density of the specimen in pounds per cubic foot or kilograms per cubic metre,11.1.3
32、The average thickness to the nearest 132 in. or 1.0 mm. State whether or not the jacket was removed,11.1.4 Individual dimensions and mass measurements only when specified, and11.1.5 Preconditioning and conditioning temperatures and relative humidities used in Section 8, unless they are specified in
33、aseparate standard.12. Precision and Bias12.1 Precision (Procedure A)The multi-laboratory 95 % repeatability limit for three materials was found to be 6.16 %, andthe 95 % reproducibility limit was found to be 9.13 % when the round robin results were analyzed using Practice E691.12.2 Precision (Proce
34、dure B)Both the multi-laboratory and single-operator coefficients of variation were found to be 1.3 %(Note 3). Therefore, the results on identical samples by two different laboratories or the results of two tests on identical materialby the same operator should not differ by more than 3.7 % on their
35、 average.NOTE 3(For Procedure 2 only), the percentage variation represents, respectively, the (1) and (D2) limits.12.3 Precision (Procedure C)The multi-laboratory 95 % repeatability limit for three materials was found to be 6.10 % and the95 % reproducibility limit was found to be 7.67 % when the rou
36、nd robin results were analyzed using Practice E691.12.4 BiasThe procedures in this test method for measuring the dimensions and the density of preformed pipe covering-typethermal insulation have no bias because no material having an accepted reference value is available.C302 13413. Keywords13.1 pipe
37、 insulation density; pipe insulation dimensions; thermal insulationASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any
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40、a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of thi
41、s standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C302 135
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