ASTM_D_4931_-_06_2011.pdf

Designation:D493106(Reapproved 2011)Standard Test Method forGross Moisture in Green Petroleum Coke1This standard is issued under the fixed designation D4931;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 indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers both the preparation procedurefor samples containing free water(air drying loss(ADL)ongross moisture samples)and the determination of the grossmoisture content of green petroleum coke.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with 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:2D2013 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collection of a Gross Sampleof CoalD3302 Test Method for Total Moisture in CoalE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 air drying,na process of partial drying of a greenpetroleum coke sample to bring it to near equilibrium with theatmosphere in the room in which further reduction/division ofthe petroleum coke sample is to take place.3.1.2 air dry loss,ADL,nthe loss in mass,expressed as apercentage,resulting from each air drying operation.3.1.3 free water,nvisible unbound water in the sample.3.1.4 green petroleum coke,nsame as raw petroleumcoke.3.1.5 gross moisture,nthat moisture determined as theloss in mass in an air atmosphere under rigidly controlledconditions of temperature,time,and air flow.3.1.5.1 DiscussionTest Method D3302 prescribes theabove controlled conditions.3.1.6 petroleum coke,nsolid,carbonaceous residue pro-duced by thermal decomposition of heavy petroleum fractions,or cracked stocks,or both.3.1.7 residual moisture,nthat moisture remaining in thesample after air drying.3.1.8 total moisture,nsynonym for gross moisture.4.Summary of Test Method4.1 This test method is based on the loss in mass of a greenpetroleum coke sample in an air atmosphere under controlledconditions of temperature,time,and air flow.4.1.1 Preparation Procedure shall be used when the petro-leum coke sample contains free water.The gross moisturesample is weighed and air dried to equilibrate it with theatmosphere.Determination of residual moisture is that deter-mined using the Drying Oven Method.Air drying and residualmoisture losses are combined to report gross moisture.4.1.2 Drying Oven Method shall be used in routine com-mercial practice when the sample does not contain free water.The sample is crushed to at least minus 25 mm(1 in.)top sievesize and divided into analytical portions of at least 500 g each.Determination of total gross moisture is calculated by summingthe results of the Drying Oven Method and the results of thePreparation Procedure.5.Significance and Use5.1 Moisture adds weight to the coke and serves no usefulpurpose.A knowledge of the moisture content is important inthe purchase and sale of green petroleum coke,both of whichare conducted on a dry basis.5.2 The collection of the sample as specified for the DryingOven Method is intended for the express purpose of determin-ing the total moisture of green petroleum coke.The standard isavailable to producers,sellers,and consumers for determina-tion when other techniques or modifications are not mutuallyagreed on.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved May 1,2011.Published August 2011.Originallyapproved in 1989.Last previous edition approved in 2006 as D493106.DOI:10.1520/D4931-06R11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 The Preparation Procedure is used only when samplecontains free water.Obtaining a representative sample of acoke source is compounded by the presence of free water.6.Apparatus6.1 Ovens:6.1.1 Air Drying OvenAdevice for passing slightly heatedair over the sample.The oven shall be capable of maintaininga temperature of 10 to 15C(18 to 27F)above ambient witha maximum oven temperature of 40C(104F)unless ambienttemperature is above 40C(104F),in which case ambienttemperature shal