1、Designation:E122612aStandard Test Method forExplosibility of Dust Clouds1This standard is issued under the fixed designation E1226;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indi
2、cates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONParticulate solids of combustible materials present a significant risk of dust explosion if suspendedin air and subjected to an ignition source.The methods of this
3、standard can be used to determine ifa dispersed dust cloud is“explosible”and,if so,to what degree it is explosible,that is,its“explosibility.”Knowledge that a dust may be explosible if dispersed as a dust cloud is important inthe conduct of a process hazard safety review.Contained herein is an explo
4、sibility or go/no-goscreening test procedure for the purpose of determining whether a dust sample is explosible.If a dust is explosible,the explosibility parameters,maximum explosion pressure,Pmax;maximumrate of pressure rise,(dP/dt)max;and explosibility index,KSt,are useful in the design of explosi
5、onprevention and control measures as described in national(NFPA)and international(ISO,CEN andothers)explosion protection standards.1.Scope1.1 Purpose.The purpose of this test method is to providestandard test methods for characterizing the“explosibility”ofdust clouds in two ways,first by determining
6、 if a dust is“explosible,”meaning a cloud of dust dispersed in air iscapable of propagating a deflagration,which could cause aflash fire or explosion;or,if explosible,determining the degreeof“explosibility,”meaning the potential explosion hazard of adust cloud as characterized by the dust explosibil
7、ityparameters,maximum explosion pressure,Pmax;maximumrate of pressure rise,(dP/dt)max;and explosibility index,KSt.1.2 Limitations.Results obtained by the application of themethods of this standard pertain only to certain combustioncharacteristics of dispersed dust clouds.No inference should bedrawn
8、from such results relating to the combustion character-istics 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 ofbulk dust in heated environments,etc.)1.3 Use.It is intended that
9、 results obtained by application ofthis test be used as elements of an explosion risk assessmentthat takes into account other pertinent risk factors;and in thespecification of explosion prevention systems(see,for exampleNFPA 68,NFPA 69,and NFPA 654)when used in conjunctionwith approved or recognized
10、 design methods by those skilledin the art.NOTE1Historically,the evaluation of the deflagration parameters ofmaximum pressure and maximum rate of pressure rise has been performedusing a 1.2-L Hartmann Apparatus.Test Method E789,which describesthis method,has been withdrawn.The use of data obtained f
11、rom the testmethod in the design of explosion protection systems is not recommended.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated wit
12、h its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D3173 Test Method for Moisture in the Analysis Sample ofCoal and Coke
13、D3175 Test Method for Volatile Matter in the AnalysisSample of Coal and CokeE789 Test Method for Dust Explosions in a 1.2-Litre ClosedCylindrical Vessel(Withdrawn 2007)31This test method is under the jurisdiction of ASTM Committee E27 on HazardPotential of Chemicals and is the direct responsibility
14、of Subcommittee E27.05 onExplosibility and Ignitability of Dust Clouds.Current edition approved Dec.1,2012.Published January 2013.Originallyapproved in 1988.Last previous edition approved in 2012 as E1226 12.DOI:10.1520/E1226-12A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orc
15、ontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,P
16、O Box C700,West Conshohocken,PA 19428-2959.United States1 E1445 Terminology Relating to Hazard Potential of Chemi-calsE1515 Test Method for Minimum Explosible Concentrationof Combustible Dusts2.2 NFPA Publication:4NFPA 68 Standard on Explosion Protection By DeflagrationVentingNFPA 69 Standard on Explosion Prevention SystemsNFPA 654 Standard for the Prevention of Fire and DustExplosions from the Manufacturing,Processing,and Han-dling of Combustible Particulate Solids2.3 VDI Standard:VDI-3673 Pres
