ASTM_C_202_-_93_2013.pdf

Designation:C20293(Reapproved 2013)Standard Test Method forThermal Conductivity of Refractory Brick1This standard is issued under the fixed designation C202;the number immediately following the designation indicates the year oforiginal adoption or,in the case 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.1.Scope1.1 This test method supplements Test Method C201 andshall be used in conjunction with that test method to determinethe thermal conductivity of refractory brick with the exceptionof insulating firebrick(use Test Method C182),and carbonrefractories.This test method is designed for refractorieshaving a conductivity factor of not more than 200 Btuin./hft2F(28.8 W/mK).1.2 UnitsThe values stated in inch-pound units are to beregarded as standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.1.2.1 ExceptionCertain flow and weight measurementsare expressed in SI units only.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 health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C155 Classification of Insulating FirebrickC182 Test Method for Thermal Conductivity of InsulatingFirebrickC201 Test Method for Thermal Conductivity of RefractoriesE220 Test Method for Calibration of Thermocouples ByComparison Techniques3.Significance and Use3.1 The thermal conductivity of refractory brick is a prop-erty required for selecting their thermal transmission charac-teristics.Users select refractory brick to provide specifiedconditions of heat loss and cold face temperature,withoutexceeding the temperature limitation of the brick.This testmethod establishes placement of thermocouples and position-ing of test specimens in the calorimeter.3.2 This procedure must be used with Test Method C201and requires a large thermal gradient and steady state condi-tions.The results are based upon a mean temperature.3.3 The data from this test method are suitable for specifi-cationacceptance,estimatingheatlossandsurfacetemperature,and design of multi-layer refractory construction.3.4 The use of these data requires consideration of the actualapplication environment and conditions.4.Apparatus4.1 The apparatus shall consist of that described in TestMethod C201 with the addition of thermocouples,back-upinsulation,and refractory fiber paper as described in Sections 6and 7 of this test method.5.Test Specimens5.1 The test specimens shall be selected and prepared inaccordance with Test Method C201.6.Installation of Thermocouples in Test Specimen6.1 ThermocouplesCalibrated3thermocouples shall beembedded in the test specimen at two points for measuringtemperature.Platinum-10%rhodium/platinum thermocouplesshall be used.Wire ofAWG Gage 28(0.320 mm)shall be usedin making the thermocouples.6.2 Installation of ThermocouplesThe hot junction of thethermocouples shall be placed in the center of each 9-by412-in.(228-by 114-mm)face and just below the surface of thetest specimen.Grooves to receive the wire shall be cut in each9-by 412-in.(228-by 114-mm)face of the brick to a depth of132in.(0.8 mm)by means of an abrasive wheel 0.02 in.(0.5mm)in thickness.The layout for the grooves allows all of thecold junction ends of the wires to extend from one end of thebrick.A groove shall be cut in the center of each 9 by 412-in.(228-by 114-mm)face along the 412-in.(114-mm)dimensionand ending 1 in.(25.4 mm)from each edge.The path of each1This test method is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.02 on ThermalProperties.Current edition approved Sept.1,2013.Published September 2013.Originallyapproved in 1945.Last previous edition approved in 2009 as C202 93(2009)1.DOI:10.1520/C0202-93R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Method E220 specifies calibration procedures for thermocouples.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 groove is extended at an angle of 90 to one end of the brickby cutting grooves parallel to and 1.0 in.(25.4 mm)from theedge of the specimen.Before cementing4the thermocouplewires in place,measurements shall be taken to obtain,within60.01 in.(0.3 mm),the eventual distance between the centerlines of the thermocouple junctions.This shall be done bymeasuring the 212-in.(64-mm)dimension of the brick at thelocation for the hot junctions and deducting the distancebetween the ce