离心泵点检标准

离心泵点检标准

CentrifugalPumpInspectionStandardsandMethods

InspectionLocations:PumpBase,Coupling,andBearings

InspectionContents:

1.Checkifthefoundationboltsarelooseorproperlysecured.

2.Checkifthebaseislevel.

3.Listenforabnormalsounds.

4.Checkforloosescrews.

5.Checkifthebearingtemperatureistoohigh.

StandardsandRequirements:

1.Tightenandsecurethefoundationbolts.

2.Adjustthebasetobelevelusingaleveler.

3.Checkfornoseriouswearontheimpeller,noaxialmovementonthetransmissionshaft,andnoabnormalsounds.

4.Checkfornoloosescrews.

5.Theslidingbearingtemperatureshouldbelessthan65℃,andtherollingbearingtemperatureshouldbelessthan70℃.

6.Therotationspeedshouldbelessthanorequalto1800r/min,andtherollingbearingamplitudeshouldbelessthan0.0762mm,whiletheslidingbearingamplitudeshouldbelessthan0.0762mm.

7.Forrotationspeedsbetween1801and4500r/min,therollingbearingamplitudeshouldbelessthan0.0508mm,whiletheslidingbearingamplitudeshouldbelessthan0.0635mm.

InspectionMethods:

1.Useahammertotap.

2.Usevisualinspection.

3.Useauditoryinspection.

4.Usevisualinspection.

5.Useinstruments.

Remarks:

1.Checkifthebearingdoublepeakamplitudeexceedstheallowablevalueusinginstruments.

2.Checkforbending,wear,cracks,anderosiononthebearings,andcheckifthepumpshaftstraightnessislessthan0.05mm.Thesurfaceroughnessshouldbelessthan0.8um.

3.Checkifthecircularscratchesontheoutercircumferenceoftheshaftsleevearetoodeep.

4.Checkifthekeyfitbetweenthetwoendsofthepumpshaftandtheimpellerandcouplingisgood.Thetwosidesofthekeyshouldhaveasmallinterferencefitwiththekeywayonthepumpshaft,whilethesidesoftheimpellerandcouplingkeywayshouldhaveatransitionalfit.

5.Whentheequipmentisrunning,thebearingshouldbedamp,andwhentheequipmentisnotrunning,watershoulddripoutatarateof5-20dropsperminute.

6.Theclearancebetweenthesealingringandtheimpellerinletendshouldbeuniform.

7.Theaxialclearancebetweenthesealingringandtheimpellershouldnotbetoohigh,andthereshouldbeagapbetweenthetwowithoutfriction.

8.SeeAppendix1andAppendix2forthestandardinnerdiameterclearance.

9.Checkiftheshaftsealistootightusingvisualinspection.

10.Checkiftheradialclearancebetweenthesealingringandtheimpellerinletendistoolargeortoosmallusinginstruments.

11.Checkforwear,corrosion,cracking,anddamageontheimpellersurface.Theimpellersurfaceshouldbesmooth.

12.Checkiftheradialrunoutoftheimpellerinletandoutletislessthan0.05mmusinginstruments.

13.Checkiftherearecracks,airholes,orslaginclusiononthepumpbodybygentlytappingitwithahammer.

14.Thepumpbody'sbearingholeshouldhaveatransitionalfitwiththeouterringoftherollingbearing,withamatchingtoler