ASTM E2019-03
(Test Method)Standard Test Method for Minimum Ignition Energy of a Dust Cloud in Air
Standard Test Method for Minimum Ignition Energy of a Dust Cloud in Air
SIGNIFICANCE AND USE
This test method provides a procedure for performing laboratory tests to determine the minimum ignition energy of a dust cloud.
Note 1—For gases and vapors, see Test Method E 582.
The data developed by this test method may be used to assess the spark ignitibility of a dust cloud. Additional guidance on the significance of minimum ignitin energy is in X1.1.
The values obtained are specific to the sample tested, the method used and the test equipment used. The values are not to be considered intrinsic material constants.
The MIE of a dust as determined using this procedure can be compared with the MIE’of reference dusts (using the same procedure) to obtain the relative sensitivity of the dust to spark ignition. An understanding of the relative sensitivity to spark ignition can be used to minimize the probability of explosions due to spark ignition.
SCOPE
1.1 This test method determines the minimum ignition energy of a dust cloud in air by a high voltage spark.
1.2 The Minimum Ignition Energy (MIE) of a dust-cloud is primarily used to assess the likelihood of ignition during processing and handling. The likelihood of ignition is used to evaluate the need for precautions such as explosion prevention systems. The MIE is determined as the electrical energy stored in a capacitor which, when released as a high voltage spark, is just sufficient to ignite the dust cloud at its most easily ignitable concentration in air. The laboratory test method described in this standard does not optimize all test variables that affect MIE. Smaller MIE values might be determined by increasing the number of repetitions or optimizing the spark discharge circuit for each dust tested.
1.3 In this test method, the test equipment is calibrated using a series of reference dusts whose MIE values lie within established limits. Once the test equipment is calibrated, the relative ignition sensitivity of other dusts can be found by comparing their MIE values with those of the reference dusts or or with dusts whose ignition sensitivities are known from experience. X1.1 of this test method includes guidance on the significance of minimum ignition energy with respect to electrostatic dishcharges.
.4 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. Specific precautionary statements are given in
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Designation: E 2019 – 03
Standard Test Method for
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Minimum Ignition Energy of a Dust Cloud in Air
This standard is issued under the fixed designation E2019; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope D3175 Test Method for Volatile Matter in the Analysis
Sample of Coal and Coke
1.1 This test method determines the minimum ignition
E582 Test Method for Minimum Ignition Energy and
energy of a dust cloud in air by a high voltage spark. .
Quenching Distance in Gaseous Mixtures
1.2 The Minimum Ignition Energy (MIE) of a dust-cloud is
E789 Test Method for Dust Explosions in a 1.2 Liter
primarily used to assess the likelihood of ignition during
Closed Cylindrical Vessel
processing and handling. The likelihood of ignition is used to
E1226 Test Method for Pressure and Rate of Pressure Rise
evaluate the need for precautions such as explosion prevention
for Combustible Dusts
systems.The MIE is determined as the electrical energy stored
E1445 Terminology Relating to Hazardous Potential of
in a capacitor which, when released as a high voltage spark, is
Chemicals
justsufficienttoignitethedustcloudatitsmosteasilyignitable
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2.2 IEC Standards:
concentration in air. The laboratory test method described in
1241-2-3,1994 ElectricalApparatusforUseinthePresence
this standard does not optimize all test variables that affect
of Combustible Dusts, Part 2: Test Method, Section 3:
MIE. Smaller MIE values might be determined by increasing
Method for Determining Minimum Ignition Energy of
the number of repetitions or optimizing the spark discharge
Dust-Air Mixtures
circuit for each dust tested.
1.3 Inthistestmethod,thetestequipmentiscalibratedusing
3. Terminology
a series of reference dusts whose MIE values lie within
3.1 Definitions of Terms Specific to This Standard:(Seealso
established limits. Once the test equipment is calibrated, the
Terminology E1445):
relative ignition sensitivity of other dusts can be found by
3.1.1 spark discharge, n—transient discrete electric dis-
comparing their MIE values with those of the reference dusts
charge, which takes place between two conductors, which are
or with dusts whose ignition sensitivities are known from
at different potentials. The discharge bridges the gap between
experience. X1.1 of this test method includes guidance on the
the conductors in the form of a single ionization channel.
significance of minimum ignition energy with respect to
3.1.2 minimum ignition energy (MIE), n—electrical energy
electrostatic discharges.
discharged from a capacitor, which is just sufficient to effect
1.4 This standard does not purport to address all of the
ignitionofthemosteasilyignitableconcentrationoffuelinair
safety concerns, if any, associated with its use. It is the
under the specific test conditions.
responsibility of the user of this standard to establish appro-
3.1.3 ignition delay time, n—the time between the onset of
priate safety and health practices and determine the applica-
dispersion of the dust sample into a cloud and the activation of
bility of regulatory limitations prior to use. Specific precau-
the ignition source.
tionary statements are given in 8
4. Summary of Test Method
2. Referenced Documents
2 4.1 A dust cloud is formed in a laboratory chamber by an
2.1 ASTM Standards:
introduction of the material with air.
D3173 TestMethodforMoistureintheAnalysisSampleof
4.2 Ignition trials of this dust-air mixture are then at-
Coal and Coke
tempted, after a specific ignition delay time, by a spark
discharge from a charged capacitor.
4.3 The stored energy discharged into the spark and the
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This test method is under the jurisdiction ofASTM Committee E27 on Hazard
occurrence or nonoccurrence of flame are recorded.
Potential of Chemicals and is the direct responsibility of Subcommittee E27.05 on
4.4 The minimum ignition energy is sought by varying the
Explosibility and Ignitability of Dust Clouds.
dust concentration, the spark discharge energy and optionally
Current edition approved Oct. 1, 2003. Published October 2003. Originally
approved in 1999. Last previous edition approved in 2002 as E2019–02.
the ignition delay time.
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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
Standardsvolume information, refer to the standard’s Document Summary page on
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the ASTM website. Available from IEC Case Postale 56, CH-1211 Geneva, 20, Switzerland.
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