1. Scope 1.1 This test method is designed to determine the limiting oxygen concentration of a combustible dust dispersed in a mixture of air with an inert/nonflammable gas in a near-spherical closed vessel of 20 L or greater volume. 1.2 Data obtained from this method provide a relative measure of the deflagration characteristics of dust clouds. 1.3 This test method should be used to measure and describe the properties of materials 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 that takes into account all of the factors that are pertinent to an assessment of the fire hazard of a particular end use. 1.4 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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
This standard will form the basis of safety for explosion mitigation using NFPA 69 STANDARD ON EXPLOSION PREVENTION SYSTEMS. By minimizing the oxygen level in an enclosed space one can eliminate the explosion potential of a dust/powder cloud. For this oxygen reduction protection scheme to be effective one has to be knowledgeable about the limiting oxygen concentration of the substance being processed. This standard establishes this limiting oxygen concentration.
KeywordsLIMITING OXYGEN CONCENTRATION, COMBUSTIBLE DUST CLOUDS:
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development