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Description of ASTM-E1226 2012ASTM E1226 - 12aStandard Test Method for Explosibility of Dust CloudsActive Standard ASTM E1226 | Developed by Subcommittee: E27.05 Book of Standards Volume: 14.02 ASTM E1226Significance and Use 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-m 3 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-m 3 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and unpublished testing has also shown that in some cases the K St -values measured in the 20-L chamber can be lower than those measured in the 1-m 3 chamber.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-m 3 chamber. If a dust has measurable (nonzero) P max - and K St -values with a 5000 or 10?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 source less than or
equal to 2500 J, it may be helpful to test the material in a larger chamber such as a 1-m 3 chamber using at least a 10 000-J ignition source to further characterize the materials
explosibility in dust cloud form.
1. Scope 1.1 Purpose. The purpose of this test method is to provide standard test methods for characterizing the explosibility of dust clouds in two ways, first by determining if a dust is explosible, meaning a cloud of dust dispersed in air is capable of propagating a deflagration, which could cause a flash fire or explosion; or, if explosible, determining the degree of explosibility, meaning the potential explosion hazard of a dust cloud as characterized by the dust explosibility parameters, maximum explosion pressure, P max ; maximum rate of pressure rise, (dP/dt) max ; and explosibility index, K St . 1.2 Limitations. Results obtained by the application of the methods of this standard pertain only to certain combustion characteristics of dispersed dust clouds. No inference should be drawn from such results relating to the combustion characteristics of dusts in other forms or conditions (for example, ignition temperature or spark ignition energy of dust clouds, ignition properties of dust layers on hot surfaces, ignition of bulk dust in heated environments, etc.) 1.3 Use. It is intended that results obtained by application of this test be used as elements of an explosion risk assessment that takes into account other pertinent risk factors; and in the specification of explosion prevention systems (see, for example NFPA 68 , NFPA 69 , and NFPA 654 ) when used in conjunction with approved or recognized design methods by those skilled in the art.
Note 1 Historically, the evaluation of the deflagration parameters of maximum pressure and maximum rate of
pressure rise has been performed using a 1.2-L Hartmann Apparatus. Test Method E789 , which describes this method, has been withdrawn. The use of data obtained from the test method in the
design of explosion protection systems is not recommended.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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.
ASTM Standards D3173 Test Method for Moisture in the Analysis Sample of Coal and Coke D3175 Test Method for Volatile Matter in the Analysis Sample of Coal and Coke E789 Test Method for Dust Explosions in a 1.2-Litre Closed Cylindrical Vessel E1445 Terminology Relating to Hazard Potential of Chemicals E1515 Test Method for Minimum Explosible Concentration of Combustible Dusts NFPA Publication NFPA654 Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate SolidsVDI Standard VDI-3673 Pressure Release of Dust ExplosionsISO Standard ISO6184/1 Explosion Protection Systems, Part 1, Determination of Explosion Indices of Combustible Dusts in AirKeywords dust explosion; explosion pressure; ICS Code ICS Number Code 13.230 (Explosion protection); 17.100 (Measurement of force, weight and pressure) DOI: 10.1520/E1226-12A ASTM International is a member of CrossRef. ASTM E1226This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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