Know_and_Understand_Centrifugal_Pumps[离心泵知识].pdf

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1、KnowandUnderstandCUSTODIOcKnowandUnderstandCentrifugaIPumpsKnowandUnderstandCentrifugaIPumpsbyLarryBachusandAngelCustodioELSEVIERUKElsevierLtd,TheBoulevard,LangfordLane,Cdlington,OxfordOX5lGB,UKUSAElsevierInc,360ParkAvenueSouth,NewYork,NY10010-1710,USAJAPANElsevierJap

2、an,TsunashimaBuildingAnnex,3-20-12Yushima,Bunkyo-ku,Tokyo113,JapanCopyright02003BachusCompany,Inc.PublishedbyElsevierLtdAllrightsreserved.Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystemortransmittedinanyformorbyanymeans:electronic,ele

3、ctrostatic,magnetictape,mechanical,photocopying,recordingorotherwise,withoutpermissioninwritingfromthepublishers.BritishLibraryCataloguinginPublicationDataBachus,LarryKnowandunderstandcentrifugalpumps1.CentrifugalpumpsI.TitleII.Custodio,Angel621.6’7ISBN1856174093Nores

4、ponsibilityisassumedbythePublisherforanyinjuryand/ordamagetopersonsorpropertyasamatterofproductsliability,negligenceorotherwise,orfromanyuseoroperationofanymethods,products,instructionsorideascontainedinthematerialherein.PublishedbyElsevierAdvancedTechnology,TheBoulev

5、ard,LangfordLane,Kidlington,OxfordOX5lGB,UKTel:+44(0)1865843000Fax:+44(0)1865843971TypesetbyLand&Unwin(DataSciences)Ltd,BugbrookePrintedandboundinGreatBritainbyBiddlesLtd,GuildfordandKing’sLynnContentsProloguexi...AbouttheAuthorsxlll1BasicPumpPrinciples1Introduction1H

6、owdopumpswork?1Pressuremeasurement4Atmosphericpressure(ATM)4Absolutepressure(psia)4Gaugepressure(psig)5Vacuum5Pumphead5Specificgravity6Pressuremeasurement6Pressuresinsidethepump72NPSH,NetPositiveSuctionHead12Introduction12DefinitionofNPSHr(required)13DefinitionNPSHa(a

7、vailable)143Cavitation24Introduction24Vaporpressure24Cavitation25Theeffectsofvaporpressureonpumpperformance25Cavitation:Apracticaldiscussion26Reviewforpreventingcavitation35ContentsCavitationreview37Dosomethingaboutcavitation!374TheAffinityLaws39Introduction39TheLaws3

8、9TheAffinityLawsandtheimpellerdiameter42What’sthepracticalapplicationoftheselaws?425UsefulWorkandPumpEfficiency44Usefulworkf