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ASTM C202-93(2013)

(Test Method)

Standard Test Method for Thermal Conductivity of Refractory Brick

Standard Test Method for Thermal Conductivity of Refractory Brick

SIGNIFICANCE AND USE
3.1 The thermal conductivity of refractory brick is a property required for selecting their thermal transmission characteristics. Users select refractory brick to provide specified conditions of heat loss and cold face temperature, without exceeding the temperature limitation of the brick. This test method establishes placement of thermocouples and positioning of test specimens in the calorimeter.  
3.2 This procedure must be used with Test Method C201 and requires a large thermal gradient and steady state conditions. The results are based upon a mean temperature.  
3.3 The data from this test method are suitable for specification acceptance, estimating heat loss and surface temperature, and design of multi-layer refractory construction.  
3.4 The use of these data requires consideration of the actual application environment and conditions.
SCOPE
1.1 This test method supplements Test Method C201 and shall be used in conjunction with that test method to determine the thermal conductivity of refractory brick with the exception of insulating firebrick (use Test Method C182), and carbon refractories. This test method is designed for refractories having a conductivity factor of not more than 200 Btu·in./h·ft2·°F (28.8 W/m·K).  
1.2 Units—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.  
1.2.1 Exception—Certain flow and weight measurements are expressed in SI units 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.

General Information

Status
Historical
Publication Date
31-Aug-2013
ICS
81.080 - Refractories
Technical Committee
C08 - Refractories
Drafting Committee
C08.02 - Thermal Properties
Current Stage
Ref Project

Relations

Replaces
ASTM C202-93(2009)e1 - Standard Test Method for Thermal Conductivity of Refractory Brick
Effective Date
01-Sep-2013
Replaced By
ASTM C202-19 - Standard Test Method for Thermal Conductivity of Refractory Brick
Effective Date
01-Apr-2019
Referred By
ASTM C1470-20 - Standard Guide for Testing the Thermal Properties of Advanced Ceramics
Effective Date
01-Sep-2013
Referred By
ASTM C201-93(2019)e1 - Standard Test Method for Thermal Conductivity of Refractories
Effective Date
01-Sep-2013

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ASTM C202-93(2013) - Standard Test Method for Thermal Conductivity of Refractory Brick
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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: C202 − 93 (Reapproved 2013)
Standard Test Method for
Thermal Conductivity of Refractory Brick
This standard is issued under the fixed designation C202; 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 conditions of heat loss and cold face temperature, without
exceeding the temperature limitation of the brick. This test
1.1 This test method supplements Test Method C201 and
method establishes placement of thermocouples and position-
shall be used in conjunction with that test method to determine
ing of test specimens in the calorimeter.
the thermal conductivity of refractory brick with the exception
of insulating firebrick (use Test Method C182), and carbon 3.2 This procedure must be used with Test Method C201
refractories. This test method is designed for refractories and requires a large thermal gradient and steady state condi-
having a conductivity factor of not more than 200 Btu·in./ tions. The results are based upon a mean temperature.
h·ft ·°F (28.8 W/m·K).
3.3 The data from this test method are suitable for specifi-
1.2 Units—The values stated in inch-pound units are to be cation acceptance, estimating heat loss and surface
regarded as standard. The values given in parentheses are temperature, and design of multi-layer refractory construction.
mathematical conversions to SI units that are provided for
3.4 Theuseofthesedatarequiresconsiderationoftheactual
information only and are not considered standard.
application environment and conditions.
1.2.1 Exception—Certain flow and weight measurements
are expressed in SI units only.
4. Apparatus
1.3 This standard does not purport to address all of the
4.1 The apparatus shall consist of that described in Test
safety concerns, if any, associated with its use. It is the
Method C201 with the addition of thermocouples, back-up
responsibility of the user of this standard to establish appro-
insulation, and refractory fiber paper as described in Sections 6
priate safety and health practices and determine the applica-
and 7 of this test method.
bility of regulatory limitations prior to use.
5. Test Specimens
2. Referenced Documents
5.1 The test specimens shall be selected and prepared in
2.1 ASTM Standards:
accordance with Test Method C201.
C155 Classification of Insulating Firebrick
6. Installation of Thermocouples in Test Specimen
C182 Test Method for Thermal Conductivity of Insulating
Firebrick
6.1 Thermocouples—Calibrated thermocouples shall be
C201 Test Method for Thermal Conductivity of Refractories
embedded in the test specimen at two points for measuring
E220 Test Method for Calibration of Thermocouples By
temperature. Platinum-10 % rhodium/platinum thermocouples
Comparison Techniques
shall be used.Wire ofAWG Gage 28 (0.320 mm) shall be used
in making the thermocouples.
3. Significance and Use
6.2 Installation of Thermocouples—The hot junction of the
3.1 The thermal conductivity of refractory brick is a prop-
thermocouples shall be placed in the center of each 9- by
erty required for selecting their thermal transmission charac-
4 ⁄2-in.(228-by114-mm)faceandjustbelowthesurfaceofthe
teristics. Users select refractory brick to provide specified
test specimen. Grooves to receive the wire shall be cut in each
9- by 4 ⁄2-in. (228- by 114-mm) face of the brick to a depth of
⁄32 in. (0.8 mm) by means of an abrasive wheel 0.02 in. (0.5
This test method is under the jurisdiction of ASTM Committee C08 on
mm) in thickness. The layout for the grooves allows all of the
Refractories and is the direct responsibility of Subcommittee C08.02 on Thermal
cold junction ends of the wires to extend from one end of the
Properties.
Current edition approved Sept. 1, 2013. Published September 2013. Originally
brick. A groove shall be cut in the center of each 9 by 4 ⁄2-in.
ε1
approved in 1945. Last previous edition approved in 2009 as C202 – 93 (2009) .
(228- by 114-mm) face along the 4 ⁄2-in. (114-mm) dimension
DOI: 10.1520/C0202-93R13.
2 and ending 1 in. (25.4 mm) from each edge. The path of each
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
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Method E220 specifies calibration procedures for thermocouples.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C202 − 93 (2013)
groove is extended at an angle of 90° to one end of the brick at right angles to the horizontal faces. The joints between the
by cutting grooves parallel to and 1.0 in. (25.4 mm) from the pieces shall be tight without the use of any mortar.
edge of the specimen. Before cementing the thermocouple
1 1
7.2 Two strips of refractory fiber paper 13 ⁄2 by ⁄2 by 0.02
wires in place, measurements shall be taken to obtain, within 1
in. (343 by 13 by 0.5 mm) shall be placed along the 13 ⁄2-in.
60.01 in. (0.3 mm), the eventual distance between the center
(343 mm) dimension of the inner guard at the outside edges.
lines of the thermocouple junctions. This shall be done by 1
Twelve strips of refractory fiber paper 2 by ⁄2 by 0.02 in. (51
measuring the 2 ⁄2-in. (64-mm) dimension of the brick at the
by13by0.5mm)shallbeplacedontheouterguardatintervals
location for the hot junctions and deducting the distance
in the pattern shown in Fig. 1. These strips serve as spacers to
between the center line of each junction in its embedded
prevent contact between the test material and the calorimeter
position and the surface of the brick.
assembly. The back-up insulation shall then be placed on the
calorimeterassemblysoastoprovidealevelandplanesurface.
7. Set-Up of Back-Up Insulation, Specimen, and Silicon
Additional strips of refractory fiber paper of the same dimen-
Carbide Slab
sions shall be placed in the same pattern upon the back-up
7.1 The calorimeter and inner and outer guards shall be
insulation. These strips serve as spacers to prevent contact
covered with a 0.50-in. (12.7-mm) thick layer of Group 20
between the fireclay brick and the back-up insulation. The test
insulating firebrick (see Classification C155) for the purpose of
specimen shall be placed centrally over the center of the
obtaining a higher mean temperature in the test specimen than
calorimeter section on its 9- by 4 ⁄2-in. (228- by 114-mm) face,
would result by placing the specimen directly over the calo-
the guard brick placed at the sides of the test specimen so as to
rimeter area.The back-up insulation shall be cut and ground so
cover completely the calorimeter and inner guard area, and the
as to provide surfaces that are plane and do not vary from
soap brick placed along the edges of the th
...

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