1、Designation:D838522Standard Test Method forDry Filterability of Lubricants and Hydraulic Fluids by MassFlow Technique1This standard is issued under the fixed designation D8385;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、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 determination of the dry filter-ability of lubricants and hydraulic fluids based upon mass flowr
3、ate measurements through a 0.8 m membrane after ageing(Note 1).The procedure applies to lubricants and hydraulicfluids that are formulated with American Petroleum Institute(API)Group I,II,III,IV,and certain V base stocks.Productsformulated with water or base stocks that are heavier thanwater are out
4、 of scope.NOTE1This test method is similar to ISO 13357 but differs from theISO method in the manner by which filterability is assessed.In ISO 13357,volume flow rates are used to determine filterability.In this test method,mass flow rates are used.Measurements of filterability based on mass flowrate
5、s facilitate automation and can be less susceptible to operator error.NOTE2Residual water due to atmospheric conditions or contaminantsis in scope for these samples and it is typically low for most in processsamples.1.2 The values stated in SI units are to be regarded asstandard.No other units of me
6、asurement are included in thisstandard.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,health,and environmental practices and deter-mine the applicability of r
7、egulatory limitations prior to use.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
8、 Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD6300 Practice for Det
9、ermination of Precision and BiasData for Use in Test Methods for Petroleum Products,Liquid Fuels,and Lubricants2.2 ISO Standards:3ISO 13357 Petroleum products Determination of the fil-terability of lubricating oils Part 2:Procedure for dryoilsISO 16889 Hydraulic fluid power Filters Multi-passmethod
10、for evaluating filtration performance of a filterelement3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology D4175.3.2 Definitions of Terms Specific to This Standard:3.2.1 filterability,nthe ability of lubricants and hydraulicfluids to pass through
11、 fine filters without plugging them;it is adimensionless number that is the ratio between two filtrationrates.3.2.2 Stage I filterability index,nthe ratio,expressed as apercentage,between 192 g and the mass of oil filtered in thetime that 192 g would have theoretically taken,assuming noplugging of t
12、he membrane.3.2.3 Stage II filterability index,nthe ratio,expressed as apercentage,between the flow rate near the start of filtration,and the flow rate between 160 g and 240 g of filtered mass.NOTE3Oils having good Stage I filterability would be unlikely tocause filter performance problems in use,un
13、less high efficiency finefiltration is employed in the equipment.Oils with good Stage II filterabil-ity would be unlikely to cause filtration problems when high efficiencyfine filtration is present.High efficiency filters,within the context of thismethod,have a Beta Ratio greater than or equal to 75
14、 at 5 m as definedby ISO 16889.(5 m 75)Thus fluids that have good Stage II filterability1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.N0 on Hydraulic Fluids.Current edition approv
15、ed July 1,2022.Published August 2022.DOI:10.1520/D8385-22.2For 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.3Availab
16、le from International Organization for Standardization(ISO),ISOCentral Secretariat,Chemin de Blandonnet 8,CP 401,1214 Vernier,Geneva,Switzerland,https:/www.iso.org.Copyright 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 Recommendat
