1、Designation:F30308Standard Practices forSampling for Particles in Aerospace Fluids andComponents1This standard is issued under the fixed designation F303;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumb
2、er in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These practices cover sampling procedures for use indetermining the particle cleanliness of liquids and liquidsamples from components.Three prac
3、tices,A,B,and C,havebeen developed on the basis of component geometry in order toencompass the wide variety of configurations.These practicesestablish guidelines to be used in preparing detailed proceduresfor sampling specific components.NOTE1The term cleanliness used in these practices refers to so
4、lidparticles in the liquid.It does not generally cover other foreign matter suchas gases,liquids,and products of chemical degradation.Cleanliness withrespect to particulate contamination does not necessarily give any indica-tion of the other types of contamination.1.2 All components,regardless of ap
5、plication,may be testedprovided(1)the fluid medium selected is completely compat-ible with the materials,packing and fluid used in the testcomponent,and test apparatus,and(2)the fluid is handled inaccordance with the manufacturers recommendations andprecautions.A liquid shall be used as the test flu
6、id medium.These test fluids may be flushing,rinsing,packing,end useoperating,or suitable substitutes for end use operating fluids.(WarningPractices for sampling surface cleanliness by thevacuum cleaner technique(used on clean room garments andlarge storage tanks)sampling gaseous fluids and handlingh
7、azardous fluids such as oxidizers,acids,propellants,and soforth,are not within the scope of the practices presented;however,they may be included in addendums or separatepractices at a later date.Substitute fluids are recommended in place of end item fluidsfor preassembly cleanliness determinations o
8、n componentsusing hazardous end item fluids.After obtaining the sample,the substitute fluid must be totally removed from the test partwith particular caution given to the possibility of trapped fluid.It is hazardous to use a substitute fluid for testing assembledparts where the fluid can be trapped
9、in dead ends,behind seals,and so forth.)NOTE2The word fluid used in these practices shall be assumed to bea liquid unless otherwise stated.1.3 The cleanliness of assemblies with or without movingparts may be determined at the time of test;however,move-ment of internal component parts during the test
10、 will createunknown quantities of contamination from wear.Practice Bcovers configurations requiring dynamic actuation to achieve asample.The practice does not differentiate between built-inparticles and wear particles.NOTE3Defining allowable cleanliness limits is not within the scopeof these practic
11、es.1.4 The three practices included are as follows:SectionsPractice AStatic Fluid Sampling(Method forextracting fluid from the test article for analysis.This applies to components that have a cavity fromwhich fluid may be extracted)5 13Practice BFlowing Fluid Sampling(Method for flush-ing contaminan
12、ts from the test article for analysis.This applies to components which fluid can pass(1)directly through,or(2)pass into and out of by cy-cling)14 22Practice CRinse Fluid Sampling(Method for rinsingcontaminants from the test articles surfaces.Therinse fluid is analyzed for contamination.This ap-plies
13、 to components that do not have a fluid cavityor for other reasons are not adaptable to PracticesA and B)23 311.5 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 a
14、nd health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1836 Specification for Commercial HexanesF311 Practice for Processing Aerospace Liquid Samples forParticulate Contamination Analysis Using Membrane Fil-ters1These pr
15、actices are under the jurisdiction of ASTM Committee E21 on SpaceSimulation and Applications of Space Technology and are the direct responsibilityof Subcommittee E21.05 on Contamination.Current edition approved Nov.1,2008.Published December 2008.Originallyapproved in 1965 as D242965 T.Redesignated F
16、303 in 1970.Last previous editionapproved in 2002 as F303 02.DOI:10.1520/F0303-08.2For 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 F312 Test Methods for Microscopical Sizing and CountingParticles from Aero
