ASTM C182-2019 pdf free download

ASTM C182-2019 pdf free download.Standard Test Method for Thermal Conductivity of Insulating Firebrick
1. 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 insulating firebrick. 1.2 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. 1.3 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
6. Installation of Thermocouples in Test Specimen
6.1 Thermocouples—Calibrated 3 thermocouples shall be embedded in the test specimen at three points for measuring the temperature. Chromel-Alumel thermocouples shall be used for temperatures below 1400 °F (760 °C), and above that tempera- ture platinum-10 % rhodium/platinum thermocouples shall be used. The platinum thermocouples may also be used at the lower temperatures, but the electromotive force (emf) will not be as high as when using base-metal thermocouples. Wire of AWG 28 (0.320 mm) shall be used for making either type of thermocouple. 6.2 Installation of Thermocouples—Holes for the thermo- couple wires shall be drilled through the 4 1 ⁄ 2 -in. (114-mm) dimension of the test specimen by the use of a drilling jig so as to obtain accurate placement of the thermocouples. The three thermocouples shall be located so that the hot junction of the first couple is 0.20 in. (5.1 mm) below the hot face of the test specimen, the junction of the second at the midpoint, and the junction of the third 0.20 in. above the cold face. The thermocouple wires leading out from the hot junctions shall be located in planes parallel to the calorimeter surface. In order to have the hot junctions over the center of the calorimeter, they shall be located on an axis passing through the center of and at right angles to the 9 by 4 1 ⁄ 2 -in. (228 by 114-mm) area ofthe test specimen. N OTE 1—Insulating firebrick that cannot be prepared to this precision because of the structure of the product should be prepared in accordance with the instructions for fireclay dense refractories.
7. Set-Up of Test Specimen and Silicon Carbide Slab
7.1 Two strips of refractory fiber paper 13 1 ⁄ 2 by 1 ⁄ 2 by 0.02 in. (343 by 13 by 0.5 mm) shall be placed along the 13 1 ⁄ 2 -in. dimension of the inner guard at the outside edges, as shown in Fig. 1. Twelve strips of refractory fiber paper 2 by 1 ⁄ 2 by 0.02 in. (51 by 13 by 0.5 mm) shall be placed on the outer guard at intervals in the pattern shown in Fig. 1. These strips serve as spacers to prevent contact between the test material and the calorimeter assembly. The test specimen shall be placed centrally over the center ofthe calorimeter section on its 9 by 4 1 ⁄ 2 -in. (228 by 114-mm) face, the guard brick placed at the sides of the test specimen so as to completely cover the calorimeter and inner guard area, and the soap brick placed around the edge ofthe three brick so as to completely cover the calorimeter assembly. The small space between the furnace walls and the test brick assembly shall be filled with a granulated insulating firebrick. 7.2 When testing Group 28, 30, 32, or 33 insulating firebrick, it may be desirable to obtain test results at higher mean temperatures than is possible with the sample set-up described in 7.1. This can be accomplished by placing a 0.5-in. (13-mm) thick layer of ceramic fiber-block insulation or 0.5 in. of Group 20 insulating firebrick between the calorimeter area and the test specimen. Sufficient material is required to cover an area 18 by 13 1 ⁄ 2 in. (456 by 342 mm). The solid sheet of back-up insulation shall be ground so as to provide surfaces that are plane and do not vary from parallel by more than 60.01 in. (0.3 mm). This shall be placed on the refractory fiber strips described in 7.1.