Designation:D4778−15StandardTestMethodforDeterminationofCorrosionandFoulingTendencyofCoolingWaterUnderHeatTransferConditions1ThisstandardisissuedunderthefixeddesignationD4778;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodprovidesdirectionsforfabricatingandoperatingatestapparatustosimultaneouslymonitorthecorrosionandfoulingtendencyofrealandpilotcoolingwatersystemsunderheattransferconditions.1.2Interpretationoftheresultsofthistestmethodmustbelefttotheinvestigator.Manyvariablesareinvolvedwhichmaynotbeeasilycontrolledorfullyunderstood.Variationsindesignandoperatingconditionsmayproduceresultsthatarenotcomparablefromunittounit.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD2331PracticesforPreparationandPreliminaryTestingofWater-FormedDepositsD2777PracticeforDeterminationofPrecisionandBiasofApplicableTestMethodsofCommitteeD19onWaterG1PracticeforPreparing,Cleaning,andEvaluatingCorro-sionTestSpecimensG16GuideforApplyingStatisticstoAnalysisofCorrosionData3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthisstandard,refertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1corrosion,n—thedeteriorationofthemetalbyreac-tionwithitsenvironment.3.2.2fouling,n—depositionoforganicmatterorinorganicmatter,orboth,onheattransfersurfacesthatresultinthelossofheattransferefficiency.3.2.3...
