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ASTM E 582 Document Information:
Title
Standard Test Method for Minimum Ignition Energy and Quenching Distance in Gaseous Mixtures
ASTM International
Publication Date:
Jan 1, 2007
Scope:
This test method covers the determination of minimum energy for
ignition (initiation of deflagration) and associated flat-plate
ignition quenching distances.2 The complete description
is specific to alkane or alkene fuels admixed with air at normal
ambient temperature and pressure. This method is applicable to
mixtures of the specified fuels with air, varying from the most
easily ignitable mixture to mixtures near to the
limit-of-flammability compositions.
Extensions to other fuel-oxidizer combinations, and to other
temperatures and pressures can be accomplished with all the
accuracy inherent in this method if certain additional conditions
are met: ( a) mixture stability and compatibility with
bomb, seal, and other materials is established through time tests
described in Section 9; (b) the expected peak pressure
from the test is within the pressure rating of the bomb
(established as required by the particular research laboratory);
(c) spark breakdown within the bomb is consistent with
Paschen's law for the distance being tested; (d) the
temperature, including that of the discharge electrodes, is
uniform; and (e) if the temperature is other than ambient,
the energy storage capacitance required is less than about 9
pF.
This method is one of several being developed by Committee E-27
for determining the hazards of chemicals, including their vapors in
air or other oxidant atmospheres. The measurements are useful in
assessing fuel ignitability hazards due to static or other
electrical sparks. However, the quenching distance data must be
used with great prudence since they are primarily applicable to the
ignition stage and therefore, represent values for initial pressure
and not the smaller values existing at higher pressures.
This standard should be used to measure and describe the
properties of materials, products, or assemblies in response to
heat and flame under controlled laboratory conditions and should
not be used to describe or appraise the fire hazard or fire risk of
materials, products, or assemblies under actual fire conditions.
However, results of this test may be used as elements of a fire
risk assessment which takes into account all of the factors which
are pertinent to an assessment of the fire hazard of a particular
end use.
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 safety precautions are
listed in Section 5.
2 Litchfield, E. L., Hay, M. H., Kubala, T. S., and
Monroe, J. S.," Minimum Ignition Energy and Quenching Distance in
Gaseous Mixtures,'' BuMines, R. L. 7009, August 1967, 11 pp.
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