ASTM_D_6908_-_06_2010.pdf

Designation:D690806(Reapproved 2010)Standard Practice forIntegrity Testing of Water Filtration Membrane Systems1This standard is issued under the fixed designation D6908;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.Scope1.1 This practice covers the determination of the integrity ofwater filtration membrane elements and systems using airbased tests(pressure decay and vacuum hold),soluble dye,continuous monitoring particulate light scatter techniques,andTOC monitoring tests for the purpose of rejecting particles andmicrobes.The tests are applicable to systems with membranesthat have a nominal pore size less than about 1 m.The TOC,and Dye,tests are generally applicable to NF and RO classmembranes only.1.2 This practice does not purport to cover all availablemethods of integrity testing.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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 health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD3864 Guide for On-Line Monitoring Systems for WaterAnalysisD3923 Practices for Detecting Leaks in Reverse Osmosisand Nanofiltration DevicesD4839 Test Method for Total Carbon and Organic Carbon inWater by Ultraviolet,or Persulfate Oxidation,or Both,andInfrared DetectionD5173 Test Method for On-Line Monitoring of CarbonCompounds in Water by Chemical Oxidation,by UVLight Oxidation,by Both,or by High Temperature Com-bustion Followed by Gas Phase NDIR or by ElectrolyticConductivityD5904 Test Method for Total Carbon,Inorganic Carbon,andOrganic Carbon in Water by Ultraviolet,PersulfateOxidation,and Membrane Conductivity DetectionD5997 Test Method for On-Line Monitoring of TotalCarbon,Inorganic Carbon in Water by Ultraviolet,Persul-fate Oxidation,and Membrane Conductivity DetectionD6161 Terminology Used for Microfiltration,Ultrafiltration,Nanofiltration and Reverse Osmosis Membrane ProcessesD6698 Test Method for On-Line Measurement of TurbidityBelow 5 NTU in WaterE20 Practice for Particle Size Analysis of Particulate Sub-stances in the Range of 0.2 to 75 Micrometres by OpticalMicroscopy(Withdrawn 1994)3E128 Test Method for Maximum Pore Diameter and Perme-ability of Rigid Porous Filters for Laboratory UseF658 Practice for Calibration of a Liquid-Borne ParticleCounter Using an Optical System Based Upon LightExtinction(Withdrawn 2007)33.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this practice,refer toTerminologies D6161 and D1129.3.1.2 For description of terms relating to cross flow mem-brane systems,refer to Terminology D6161.3.1.3 For definition of terms relating to dissolved carbonand carbon analyzers,refer to D5173,D5904 and D5997.3.1.4 bubble pointwhen the pores of a membrane arefilled with liquid and air pressure is applied to one side of themembrane,surface tension prevents the liquid in the poresfrom being blown out by air pressure below a minimumpressure known as the bubble point.3.1.5 equivalent diameterthe diameter of a pore or defectcalculated from its bubble point using Eq 1(see 9.3).This isnot necessarily the same as the physical dimensions of thedefect(s).1This practice is under the jurisdiction of ASTM Committee D19 on Water andis the direct responsibility of Subcommittee D19.08 on Membranes and IonExchange Materials.Current edition approved May 1,2010.Published May 2010.Originallyapproved in 2003.Last previous edition approved in 2006 as D6908 06.DOI:10.1520/D6908-06R10.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.6 integritymeasure of the degree to which a mem-brane system rejects particles of interest.Usually expressed asa log reduction value(LRV).3.1.7 log reduction value(LRV)a measure of the particleremoval efficiency of the membrane system expressed as thelog of the ratio of the particle concentration in the untreatedand treated fluid.For example,a 10-fold reduction in particleconcentration is an LRV of 1.The definition of LRV within thisS