ASTM E2019-02e1

Standard Test Method for Minimum Ignition Energy of a Dust Cloud in Air

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.
1.4 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 Section 8.

General Information

• Status: Historical
• Publication Date: 09-Jun-2002
• ICS: 13.230 - Explosion protection
• Technical Committee: E27 - Hazard Potential of Chemicals
• Drafting Committee: E27.05 - Explosibility and Ignitability of Dust Clouds

Relations

• Replaced By: ASTM E2019-03 - Standard Test Method for Minimum Ignition Energy of a Dust Cloud in Air
• Effective Date: 01-Oct-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
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Designation: E 2019 – 02
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 (ϵ) indicates an editorial change since the last revision or reapproval.
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ϵ NOTE—Paragraph 9.2 was corrected editorially July 2003.
1. Scope D3175 Test Method for Volatile Matter in the Analysis
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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. .
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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
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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
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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
3
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 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, n—electrical energy dis-
electrostatic dishcharges.
charged from a capacitor, which is just sufficient to effect
1.4 This standard does not purport to address all of the
ignition of the most ignitable mixture of a given fuel-mixture
safety concerns, if any, associated with its use. It is the
under 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
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
2 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.
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4.3 The stored energy discharged into the spark and the
This test method is under the jurisdiction ofASTM Committee E27 on Hazard
Potential of Chemicals and is the direct responsibility of Subcommittee E27.05 on
occurrence or nonoccurrence of flame are recorded.
Explosibility and Ignitability of Dust Clouds.
Current edition approved July 18, 2003. Published September 2002. Originally
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published as E2019–99. Last previous edition E2019–99. Annual Book of ASTM Standards, Vol 14.02.
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Annual Book of ASTM Standards, Vol 05.05. Available from IEC Case Postale 56, CH-1211 Geneva, 20, Switzerland.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E2019–02
4.4 The minimum ignition energy is sought by varying the charge. This is increasingly important at low stored energies.
dust concentration, the spark discharge energy and optionally Electrodes with round
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