Interlaboratory comparison of the horizontal pipe insulation test apparatus up to 350{degrees}C

Conference · Wed Dec 01 04:00:00 EST 1993

OSTI ID:10105746

Whitaker, T E ^[1]; Graves, R S ^[2]; McElroy, D L ^[3]; Smith, D R ^[4]

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1. Pabco, Fruita, CO (United States)
2. Oak Ridge National Lab., TN (United States)
3. McElroy (David L.), Knoxville, TN (United States)
4. National Institute of Standards and Technology, Boulder, CO (United States)

The purpose of this interlaboratory comparison was to provide information for the precision and bias section in the ASTM Standard Test Method C 335, {open_quotes}Steady-State Heat Transfer Properties of Horizontal Pipe Insulation.{close_quotes} (The text describes the ASTM C 335 test method, the specimens tested and the test protocol). The apparent thermal conductivity of two rigid calcium silicate pipe insulation specimens was measured by eight laboratories. Each laboratory measured both specimens at four different temperatures. The test mean temperatures ranged from 35 to 390{degrees}C. The two standard deviation value for the data ranged from 4.5 to 7.7% and the average value was 6.3%. The statement recommended for the precision and bias statement for Section 13.1.4 of ASTM C 335 is: {open_quotes}Tests performed at seven different laboratories using guarded-end horizontal pipe test apparatus and at one laboratory using an unguarded cylindrical screen test apparatus on two specimens of calcium silicate insulation in the range of mean temperatures from 35 to 390{degree}C did not vary by more than 6.3% (two standard deviations) of the average.{close_quotes}

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 10105746
• Report Number(s): CONF-9311131--1; ON: DE94003498
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320107
320302
BUILDING SYSTEMS
CALCIUM SILICATES
COMPARATIVE EVALUATIONS
CYLINDERS
HEAT TRANSFER
MATERIALS
MEASURING INSTRUMENTS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
THERMAL CONDUCTIVITY
THERMAL INSULATION