ASTM E1226-00e1

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Designation: E 1226 – 00
Standard Test Method for
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Pressure and Rate of Pressure Rise for Combustible Dusts
This standard is issued under the fixed designation E1226; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (ϵ) indicates an editorial change since the last revision or reapproval.
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ϵ NOTE—Paragraph 9.2 was editorially corrected July 2003.
INTRODUCTION
The primary objective for the laboratory determination of the dust deflagration index, K , the
St
maximumpressure,P ,andthemaximumrateofpressurerise,(dP/dt) ,istheuseofthesevalues
max max
for the design of protection systems. These parameters provide a measure of the potential severity of
adeflagrationofacombustibledust-airmixture.Theseparametersareafunctionofmanyfactors,such
as the turbulence, concentration, and homogeneity of the dust-air mixture; the type, energy, and
locationoftheignitionsource;thegeometryofthetestvessel;theparticlesizedistributionofthedust;
and the initial temperature and pressure of the tested mixture. Therefore, it is necessary to develop a
standard laboratory test method, the data from which can be referenced against data from large-scale
testing. For information on the sizing of deflagration vents, see NFPA68.
This test method describes procedures for explosibility testing of dusts in laboratory chambers that
have volumes of 20 Lor greater. It is the purpose of this test method to provide information that can
be used to predict the effects of an industrial scale deflagration of a dust-air mixture without requiring
large-scale tests.
NOTE 1—The evaluation of the deflagration parameters of maximum
1. Scope
pressureandmaximumrateofpressurerisecanalsobedoneusinga1.2-L
1.1 This test method is designed to determine the deflagra-
Hartmann Apparatus. Test Method E789, has been published regarding
tion parameters of a combustible dust-air mixture within a
this application; however, the use of these data in the design of
near-spherical closed vessel of 20 L or greater volume. The
deflagration venting and containment systems is not recommended.
parameters measured are the maximum pressure and the
1.4 This standard does not purport to address all of the
maximum rate of pressure rise.
safety concerns, if any, associated with its use. It is the
1.2 Data obtained from this test method provide a relative
responsibility of the user of this standard to establish appro-
measure of deflagration characteristics. The data have also
priate safety and health practices and determine the applica-
been shown to be applicable to the design of protective
bility of regulatory limitations prior to use.
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measures, such as deflagration venting (1).
1.3 Thistestmethodshouldbeusedtomeasureanddescribe
2. Referenced Documents
the properties of materials in response to heat and flame under
2.1 ASTM Standards:
controlled laboratory conditions and should not be used to
D3173 TestMethodforMoistureintheAnalysisSampleof
describe or appraise the fire hazard or fire risk of materials,
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Coal and Coke
products, or assemblies under actual fire conditions. However,
D3175 Test Method for Volatile Matter in the Analysis
results of this test may be used as elements of a fire risk
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Sample of Coal and Coke
assessment that takes into account all of the factors that are
E789 Test Method for Pressure and Rate of Pressure Rise
pertinent to an assessment of the fire hazard of a particular end
for Dust Explosions in a 1.2-Litre Closed Cylindrical
use.
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Vessel
E1515 Test Method for Minimum Explosible Concentra-
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ThistestmethodisunderthejurisdictionofASTMCommitteeE-27onHazard
tion of Combustible Dusts
Potential of Chemicals and is the direct responsibility of Subcommittee E27.05 on
2.2 NFPA Publication:
Dusts.
Current edition approved July 18, 2003. Published April 2000. Originally
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published as E1226–88. Last previous edition E1226–94 .
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The boldface numbers in parentheses refer to a list of references at the end of Annual Book of ASTM Standards, Vol 05.05.
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this test method. Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E1226–00
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NFPA 68 Guide for Deflagration Venting
2.3 VDI Standard:
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VDI-3673 Pressure Release of Dust Explosions
2.4 ISO Standard:
ISO 6184/1 Explosion Protection Systems, Part 1, Determi-
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nation of Explosion Indices of Combustible Dusts inAir
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 P —the maximum explosion pressure (above the
ex
pressureinthevesselatthetimeofignition)reachedduringthe
course of a single deflagration test (see Fig
...