ASTM E1226-12a PDF

Scope: 5.1 This test method provides a procedure for performing laboratory tests to evaluate deflagration parameters of dusts.

5.2 The data developed by this test method may be used for the purpose of sizing deflagration vents in conjunction with the nomographs and equations published in NFPA 68 , ISO 6184/1 , or VDI 3673 .

5.3 The values obtained by this testing technique are specific to the sample tested and the method used and are not to be considered intrinsic material constants.

5.4 For dusts with low K_St-values, discrepancies have been observed between tests in 20-L and 1-m³ chambers. A strong ignitor may overdrive a 20-L chamber, as discussed in Test Method E1515 and Refs (1-3).⁷
Note 5—Ref (2) concluded that dusts with K_St-values below 45 bar m/s when measured in a 20-L chamber with a 10 000-J ignitor, may not be explosible when tested in a 1-m³ chamber with a 10 000-J ignitor. Ref (2) and unpublished testing has also shown that in some cases the K_St-values measured in the 20-L chamber can be lower than those measured in the 1-m³ chamber. Refs (1) and (3) found that for some dusts, it was necessary to use lower ignition energy in the 20-L chamber in order to match MEC or MIC test data in a 1-m³ chamber. If a dust has measurable (nonzero) P_max- and K_St-values with a 5000 or 108201;000-J ignitor when tested in a 20-L chamber but no measurable P_max- and K_St-values with tests conducted using an ignition sou......

ASTM E1226-12a Referenced Document

ASTM D3173 Standard Test Method for Moisture in the Analysis Sample of Coal and Coke
ASTM D3175 Standard Test Method for Volatile Matter in the Analysis Sample of Coal and Coke
ASTM E1445 Standard Terminology Relating to Hazardous Potential of Chemicals
ASTM E1515 Standard Test Method for Minimum Explosible Concentration of Combustible Dusts
ASTM E789 Standard Test Method for Dust Explosions in a 1.2-Litre Closed Cylindrical Vessel (Withdrawn 2007)
ISO 6184-1 Explosion protection systems; Part 1 : Determination of explosion indices of combustible dusts in air

2019 ASTM E1226-19 Standard Test Method for Explosibility of Dust Clouds
2012 ASTM E1226-12a Standard Test Method for Explosibility of Dust Clouds
2012 ASTM E1226-12 Standard Test Method for Explosibility of Dust Clouds
2010 ASTM E1226-10 Standard Test Method for Explosibility of Dust Clouds
2009 ASTM E1226-09 Standard Test Method for Pressure and Rate of Pressure Rise for Combustible Dusts
2005 ASTM E1226-05 Standard Test Method for Pressure and Rate of Pressure Rise for Combustible Dusts
2000 ASTM E1226-00e1 Standard Test Method for Pressure and Rate of Pressure Rise for Combustible Dusts
2000 ASTM E1226-00 Standard Test Method for Pressure and Rate of Pressure Rise for Combustible Dusts