Test certificate of gate valve to BS EN1074-2

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1、Subject：WitnesstheTypeTestofD.I.GateValvestoBSEN1074-2:20001.0)Dateofwitness2.0)Locationofwitness3.0)ApplicableStandard:BSEN1074-2:20004.0)SamplesDescriptionsSamplesdescriptionNominalSize(DN)(mm)MarkingsBlueepoxycoatedD.I.gatevalves,non-risingS.S.stem,metalseated,captopop

2、erated,PN1680DNXXXPN16DICFBSEN1074BS5163-120071001502002503005.0)ScopeofthetestsThetestedvalvesweresubjecttothefollowingtests,i.e.5.1)Visualinspectionfortheappearance&onthethecoating5.2)Resistancetointernalpressureoftheshellandofallpressurecontainingcomponents/leakagetigh

3、tnesstointernalpressure5.3)Resistanceofobturatortodifferentialpressure5.4)Seattightnessathighdifferentialpressure5.5)Seattightnessatlowdifferentialpressure5.6)Max.operatingtorque(MOT)-co-operatedwiththetestsofitem5.3&5.45.7)Endurancetest5.8)Resistanceofthevalvetooperating

4、load6.0)TestResults6.1)Visualinspectionforappearance&onthecoatingTherewasnovisibledamage&significantdefect(i.e.blowholes,cavitiesetc)wasobservedonthevalves.Thevalveswerecoatedwithfusionbondepoxyinbluecolorwiththecoatingthicknessinrangeof267-475micron(min.250micronasspecif

5、iedbythemanufacturer).Thecoatingwerefoundadheredtothevalvessurfacefirmlywithoutanysignificantdefectasrevealedvisually.6.2)Resistancetointernalpressureoftheshellandofallthepressurecontainingcomponents/leaktightnesstointernalpressure(obturatoropened)DNTestPressure(MPa)TestD

6、uration（minute）TestResultsRemarks80(metalseated)2.5≧10Novisibleleakage&failureofanykindwereobservedacceptable100(metalseated)150(metalseated)200(metalseated)250(metalseated)300(metalseated)TestProcedureClosetheendsofthevalveFillthevalvewithwaterandventairRaisethepressureu

7、ntilitreachesthetestpressureMaintainthepressureforthespecifiedtestdurationCheckvisuallythatthereisnodetectableexternalleakageandnoothersignofdefectduringthespecifiedtestdurationTerminatethetestandrecordthetestconditionsandtestresultsRequirements:Thereshouldbenovisuallydet

8、ectableexternalleakageandnoothersignofdefect.6.3)Resistanceoftheobturatortodifferentialpressure(