1、Designation:D429683(Reapproved 2015)1Standard Practice forSampling Pitch1This standard is issued under the fixed designation D4296;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.1NOTESI units formatting was corrected editorially in May 2015.1.Scope1.1 This practice covers procedures for sampling pitch atpoints of manufacture,storage,and delivery.1.2 Th
3、e values stated in SI units are to be regarded asstandard.The values in parentheses are for information only.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 an
4、d health practices and determine the applica-bility of regulatory limitations prior to use.Specific warningstatements are given in Section 11.2.Terminology2.1 Definitions:2.1.1 bulk samplea large sample,either from one place ormade up of several incremental samples of the same material.2.1.2 composi
5、te samplea thoroughly mixed gross sample.2.1.3 gross samplea large sample made up of severalportions(increments)of a mass of material.2.1.4 incrementa portion of a material to be combinedwith other portions of the same material to provide a largersample which will represent the whole material.2.1.5
6、representative samplea part of a homogeneousmaterial,or a part of the composited and mixed portions of amaterial,which carries all the true properties and physicalcharacteristics of the whole material.2.1.6 samplea part taken as representative of a wholematerial.3.Summary of Practice3.1 Samples of l
7、iquid pitches are taken from process lines,storage,and shipment containers in increments required toprepare a representative sample for testing.3.2 Samples of solid pitches are taken from loadingsystems,storage,and shipment containers in increments re-quired to prepare a representative sample for te
8、sting.4.Significance and Use4.1 Sampling is as important as testing.If the sampling isimproperly done,the sample of the material will be in error,and the analysis will not represent the true properties of thematerial,and it may be impossible or impracticable to takeanother sample;whereas,if the samp
9、le is properly taken andthe analysis is in error,another analysis can readily be made ofthe original sample.4.2 Samples may be taken for either of the following twopurposes:4.2.1 To represent as nearly as possible an average of thebulk of the materials sampled,or4.2.2 To ascertain the maximum variat
10、ion in characteristicswhich the material possesses.4.3 A good sampling plan has the following characteristics:4.3.1 It protects the consumer against the acceptance of abad batch of material.4.3.2 It protects the producer against the rejection of a goodbatch of material.4.3.3 It gives long-range prot
11、ection to the consumer.4.3.4 It encourages the producer to keep his process incontrol.4.3.5 It minimizes the cost of sampling,inspection oftesting,and administration.4.3.6 It provides information concerning the quality of theproduct.4.4 Sampling IntegrityWhen one takes a sample,one isattempting to r
12、epresent a batch or lot of material with thatsample.Different forms of pitch,and pitch in different types ofcontainers,need to have different sampling plans and appro-priate sampling equipment.Each sampling plan should bedesigned so that it accomplishes its objective,which is toascertain the charact
13、eristics or quality of a batch or lot ofmaterial.5.Selection of Samples5.1 Pitches shall be sampled by the producer at the point ofmanufacture or storage,and at such time as to allow the tests1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubrica
14、ntsand is the direct responsibility of Subcom-mittee D02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved April 1,2015.Published May 2015.Originallyapproved in 1983.Last previous edition approved in 2009 as D4296 83(2009).DOI:10.1520/D4296-83R15E01.Copyright ASTM
15、 International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 controlling acceptance or rejection of quality,as specified bythe consumer,to be made in advance of a shipment.5.2 Samples of pitches shall be taken by the consumer fromthe shipment containers immediately
16、 upon delivery and receiptand tests controlling acceptance or rejection of quality,asdescribed by the consumers specifications,shall be made assoon as possible.6.Size of Samples6.1 The sample size of liquid materials shall be as follows:6.1.1 From process lines,1 L(1 qt).6.1.2 From bulk storage,1 L(1 qt)or 1 L aliquot of com-posite sample.6.1.3 From bulk shipment containers,1 L(1 qt)or 1 Laliquot of composite sample.6.1.4 From barrels or drums,0.5 L(1 pt)or 0.5 L aliquot ofcomposite sample.6.2 T