Designation:D1291−17StandardPracticeforEstimationofChlorineDemandofWater1ThisstandardisissuedunderthefixeddesignationD1291;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesameansofestimatingthequan-tityofchlorinerequiredtobeaddedtoaunitvolumeofwatertoaccomplishapredeterminedtreatmentobjectiveortocompletelyreactwithallchlorinereactablesubstancesinthewater,orboth.1.2Temperature,pH,andinitialchlorinedosageareallvariablesinestimatingtheoptimumchlorinationpractice.Theeffectsofthesevariablescanbeevaluatedusingthispractice.1.3ChlorineresidualisdeterminedusingTestMethodD1253.1.4Thispracticeisapplicabletoalltypesofwaterinwhichthestatedtreatmentobjectivecanbeevaluatedorresidualchlorinecanbemeasured,orboth.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Foraspecifichazardstatement,see7.5.1.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD1253TestMethodforResidualChlorineinWaterD1293TestMethodsforpHofWaterD3370PracticesforSamplingWaterfromClosedConduits3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthisstandard,seeTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1chlorinedemand,n—theamountofchlorinethatmustbeaddedtoaunitvolumeofwaterunderspecifiedconditionsofpH,temperature,andcontacttimetocompletelyreactwithallchlorine-reactablesubstancesinthewater.3.2.1.1Discussion—Itisdefinedasthedifferencebetweentheamountofchlorineappliedandtheamountoffreechlorineremainingatthe...
