Designation:D3739−06(Reapproved2010)StandardPracticeforCalculationandAdjustmentoftheLangelierSaturationIndexforReverseOsmosis1ThisstandardisissuedunderthefixeddesignationD3739;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticecoversthecalculationandadjustmentoftheLangeliersaturationindexfortheconcentratestreamofareverseosmosisdevice.Thisindexisusedtodeterminetheneedforcalciumcarbonatescalecontrolintheoperationanddesignofreverseosmosisinstallations.Thispracticeisappli-cableforconcentratestreamscontainingxx10to10000mg/Loftotaldissolvedsolids.Forconcentratecontainingover10000mg/LseePracticeD4582.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D511TestMethodsforCalciumandMagnesiumInWaterD1067TestMethodsforAcidityorAlkalinityofWaterD1129TerminologyRelatingtoWaterD1293TestMethodsforpHofWaterD1888MethodsOfTestforParticulateandDissolvedMatterinWater(Withdrawn1989)3D4194TestMethodsforOperatingCharacteristicsofRe-verseOsmosisandNanofiltrationDevicesD4195GuideforWaterAnalysisforReverseOsmosisandNanofiltrationApplicationD4582PracticeforCalculationandAdjustmentoftheStiffandDavisStabilityIndexforReverseOsmosisD6161TerminologyUsedforMicrofiltration,Ultrafiltration,NanofiltrationandReverseOsmosisMembraneProcesses3.Terminology3.1Defintions—Fordefinitionsoftermsusedinthispractice,refertoTerminologyD1129andTerminologyD6161.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1Fordescriptionsoftermsrelatingtoreverseosmosis,referto...
