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ASTM E 3057 : 2016

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Test Method for Measuring Heat Flux Using Directional Flame Thermometers with Advanced Data Analysis Techniques
Available format(s)

Hardcopy , PDF

Superseded date

07-10-2019

Language(s)

English

Published date

04-01-2016

CONTAINED IN VOL. 15.03, 2016 Specifies the continuous measurement of the hemispherical heat flux to one or both surfaces of an uncooled sensor called a 'Directional Flame Thermometer' (DFT).

1.1This test method describes the continuous measurement of the hemispherical heat flux to one or both surfaces of an uncooled sensor called a “Directional Flame Thermometer” (DFT).

1.2DFTs consist of two heavily oxidized, Inconel 600 plates with mineral insulated, metal-sheathed (MIMS) thermocouples (TCs, type K) attached to the unexposed faces and a layer of ceramic fiber insulation placed between the plates.

1.3Post-test calculations of the net heat flux can be made using several methods The most accurate method uses an inverse heat conduction code. Nonlinear inverse heat conduction analysis uses a thermal model of the DFT with temperature dependent thermal properties along with the two plate temperature measurement histories. The code provides transient heat flux on both exposed faces, temperature histories within the DFT as well as statistical information on the quality of the analysis.

1.4A second method uses a transient energy balance on the DFT sensing surface and insulation, which uses the same temperature measurements as in the inverse calculations to estimate the net heat flux.

1.5A third method uses Inverse Filter Functions (IFFs) to provide a near real time estimate of the net flux. The heat flux history for the “front face” (either surface exposed to the heat source) of a DFT can be calculated in real-time using a convolution type of digital filter algorithm.

1.6Although developed for use in fires and fire safety testing, this measurement method is quite broad in potential fields of application because of the size of the DFTs and their construction. It has been used to measure heat flux levels above 300 kW/m2 in high temperature environments, up to about 1250°C, which is the generally accepted upper limit of Type K or N thermocouples.

1.7The transient response of the DFTs is limited by the response of the MIMS TCs. The larger the thermocouple the slower the transient response. Response times of approximately 1 to 2 s are typical for 1.6 mm diameter MIMS TCs attached to 1.6 mm thick plates. The response time can be improved by using a differential compensator.

1.8The values stated in SI units are used in this standard. The values stated in parentheses are provided for information only.

1.9This 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.

Committee
E 21
DocumentType
Test Method
Pages
24
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy

ASTM E 603 : 2017 Standard Guide for Room Fire Experiments
ASTM E 603 : 2017 : REDLINE Standard Guide for Room Fire Experiments

ASTM E 2683 : 2017 : REDLINE Standard Test Method for Measuring Heat Flux Using Flush-Mounted Insert Temperature-Gradient Gages
ISO 834-11:2014 Fire resistance tests Elements of building construction Part 11: Specific requirements for the assessment of fire protection to structural steel elements

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