1、Designation:F30713Standard Practice forSampling Pressurized Gas for Gas Analysis1This standard is issued under the fixed designation F307;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parenthese
2、s indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This practice describes procedures for obtaining asample of pressurized gas for
3、 gas analysis from a system orcomponent.1.2 The values stated in SI units are to be regarded as thestandard.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
4、 health practices and determine the applica-bility of regulatory limitations prior to use.For hazardstatement,see Section 6.2.Referenced Documents2.1 ASTM Standards:2F310 Practice for Sampling Cryogenic Aerospace FluidsG93 Practice for Cleaning Methods and Cleanliness Levelsfor Material and Equipmen
5、t Used in Oxygen-EnrichedEnvironments3.Terminology3.1 Definitions:3.1.1 sample portthe designated point in a system orcomponent from which a representative gas sample may betaken.4.Summary of Practice4.1 Evacuated Sample Vessel ProcedureA sample pres-sure vessel is evacuated and sealed with a minimu
6、m vacuumpressure of 10-3torr.The vessel is then attached to thedesignated pressurized sample port.The pressurized gas isallowed to enter the sample vessel until the pressure is equal tothe pressure of the system or component.The pressure issecured and the sample vessel assigned for appropriate analy
7、-sis.4.2 Purged Sample Vessel ProcedureThe pressurized gassample port is opened to establish a low level purge.A samplevessel with valves opened at each end is attached to thepressurized sample port.The pressurized sample port is openedand the purge pressure is increased to completely purge thevesse
8、l prior to sample capture.The vessel valves and sampleport valves are then closed and the sample vessel delivered foranalysis.5.ApparatusNOTE1All apparatus used in the sample taking should be verified ascleaned and packaged within the requirements of the allowable contami-nation of the system.5.1 Co
9、nnecting Lines,rigid or flexible,pressure rated andidentified within recognized safety codes.5.2 Miscellaneous Fittings,as needed for sampling pointadaption.5.3 Tie-downs,suitable for sample line restraint in accordwith pressure,temperature,and recognized safety codes.5.4 Gas Sample Vessel,rated for
10、 the appropriate maximumand minimum pressure for the gas analysis method to be used.This vessel should have valves at inlet and outlet to enablelockup of vacuum or pressure.(See Fig.1.)NOTE2The gas sample vessel capacity is selected in accord withdesired sample volume.For evacuated vessel sampling,a
11、 recommended8-L(500-in3)volume has been determined adequate to aerospace industry.Evacuated sample vessels should be helium leak tested prior to use.6.Safety Hazards6.1 Personnel must stand clear of exiting gas.6.2 Ear protection must be used when gas flow approachessonic velocity.6.3 All lines and
12、associated equipment must be connectedand operated within the requirements of recognized safetycodes.1This practice is under the jurisdiction of ASTM Committee E21 on SpaceSimulation and Applications of Space Technology and is the direct responsibility ofSubcommittee E21.05 on Contamination.ASTM Com
13、mittee D02 on PetroleumProducts and Lubricants maintains a continued interest in this practice and willmake use of it in the future.Current edition approved June 1,2013.Published July 2013.Originally approvedin 1966.Last previous edition approved in 2007 as F307 02(2007).DOI:10.1520/F0307-13.2For re
14、ferenced 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 Consh
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16、ampling area should be restricted toinvolved personnel during sampling.6.5 No welding,heat,or spark-producing operations areallowed in an area where sampling of reactive gases such ashydrogen or oxygen is to take place.Brass(non-sparking)toolsand non-static coverall or clothing should be used.6.6 When sampling pressurized oxygen,the samplingvessel,connecting lines,and fittings must be constructed ofmaterials that are compatible with oxygen at the concentrationand pressure being sampled.All sampl