ASTM_D_6849_-_22.pdf

Designation:D684922Standard Practice forStorage and Use of Liquefied Petroleum Gases(LPG)inSample Cylinders for LPG Test Methods1This standard is issued under the fixed designation D6849;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.Scope*1.1 This practice covers information for the storage and useof LPG samples in standard cylinders of the type used insampling method,Practice D1265 and floating piston cylindersused in sampling method,Practice D3700.1.2 This practice is especially applicable when the LPGsample is used as a quality control(QC)reference material forLPG test methods,such as gas chromatography(GC)analysis(Test Method D2163)or vapor pressure(Test Method D6897)that use only a few mL per test,since relatively small portableDepartment of Transportation(DOT)cylinders(for example,20 lb common barbecue cylinders,or common Mower/Forkliftcylinders)can be used.1.2.1 Modification of the pressure relief(QCC1)valve onsingle access port cylinders may prohibit the collection ortransport of cylinders outside of permitted facilities such asrefineries,gas plants or pipeline stations.No modification isgenerally required for multi-port mower/forklift cylinders thathave a separate access port for pressure relief and additionalaccess ports for filling,liquid/vapor withdrawal or liquid levelindication.Consult the Authority having Jurisdiction for de-tailed regional regulatory requirements for transport of LPG inpressurized cylinders.1.3 This practice can be applied to other test methods.However,test methods that require a large amount of sampleper test(for example,manual vapor pressure Test MethodD1267)will require QC volumes in excess of 1000 L if storedin standard DOT cylinders or American Society of MechanicalEngineers(ASME)vessels.1.3.1 Test methods for trace materials that may be sensitiveto vessel surfaces(for example H2O,H2S/sulfur,or traceresidues)could preferably use aluminum,stainless steel orinternally coated vessels to minimize surface absorption/reaction or larger vessels to minimize surface/volume ratio.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD1267 Test Method for Gauge Vapor Pressure of LiquefiedPetroleum(LP)Gases(LP-Gas Method)D2163 Test Method for Determination of Hydrocarbons inLiquefied Petroleum(LP)Gases and Propane/PropeneMixtures by Gas ChromatographyD3700 Practice for Obtaining LPG Samples Using a Float-ing Piston CylinderD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6897 Test Method for Vapor Pressure of Liquefied Petro-leum Gases(LPG)(Expansion Method)3.Terminology3.1 Definitions:3.1.1 floating piston cylinder(FPC),nhigh-pressuresample container with a free-floating internal piston thateffectively divides the container into two separate compart-ments.3.1.1.1 DiscussionA floating piston cylinder is used tocollect a sample of liquid under pressure without the formationof a gaseous phase which can result in changes in thecomposition of the liquid sample.3.1.2 high-pressure sample cylinder,na container used forstorage and transportation of a sample obtained at pressuresabove atmospheric pressure.1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.08 on Volatility.Current edition approved May 1,2022.Published July 2022.Originally approvedin 2002.Last previous edition approved in 2021 as D6849 13(2021).DOI:10.1520/D6849-22.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.1.2.1 DiscussionThis type of sample cylinder,some-times called a standard 80%fill cylinder,when used for LPGtypically contains both l