Centrifugal Pump Vibrations

5/18/2018 Centrifugal Pump Vibrations

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Centrifugal Pump Vibrations:

The Causes

by

Steven J. Hrivnak, P.E.

Associate Mechanical Engineer

Tennessee Eastman

Eastman Chemical Company

EASTMAN


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FAULTSREPORTEDOVER !EARS


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Vibration:Vibration: a measure of reliabilit"#a measure of reliabilit"#

Poorl"installe$ an$ operate$ pumps a%erage

&'() in*se+o%erall %ibration

an$ ha%e, months life&

Properl"installe$ pumps a%erage

&-(' in*se+o%erall %ibrationan$ ha%e,- months life&

EASTMAN


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Three .asi+ Causes of PumpThree .asi+ Causes of Pump

Vibrations:Vibrations:

/e+hani+all"/e+hani+all"

0n$u+e$0n$u+e$

S"stem 0n$u+e$S"stem 0n$u+e$

Operation 0n$u+e$Operation 0n$u+e$


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/e+hani+all" 0n$u+e$/e+hani+all" 0n$u+e$

.a$ bearings.a$ bearings

.ent Shaft.ent Shaft

Unbalan+e$ RotorUnbalan+e$ Rotor

Che+1 Val%e 0nstalle$ .a+12ar$sChe+1 Val%e 0nstalle$ .a+12ar$s

/is3Alignment/is3Alignment

LoosenessLooseness

Soft FootSoft Foot

/a4imum Si5e 0mpeller/a4imum Si5e 0mpeller


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S"stem 0n$u+e$S"stem 0n$u+e$

Partiall"*Plugge$ StrainerPartiall"*Plugge$ Strainer

Clogge$ 0mpeller or Su+tion LineClogge$ 0mpeller or Su+tion Line

0nstallation0nstallation


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PIPING?


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Fon!ationsFon!ations

an!an!

"aseplates"aseplates


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The mass ratio must be :' toThe mass ratio must be :' tominimi5e %ibrationminimi5e %ibration


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Operationall" 0n$u+e$Operationall" 0n$u+e$

Ca%itationCa%itation

Flo2Flo2

Spee$Spee$

0nsuffi+ient 0mmersion of Su+tion Pipe or0nsuffi+ient 0mmersion of Su+tion Pipe or

.ell.ell


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Ca%itation an$ Flo2Ca%itation an$ Flo2


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Operating Off The .&E&P&

Flo2

6ea

$6ighTemp&Rise

Lo2F

lo2

Ca%itation

Lo2.earing

an$SealLife

Re$u+e$

0mpellerLife

Su+tionRe+ir+ulation

Dis+hargeRe+

ir+ulation

.&E&P&

Lo2.earingan$

SealLife

Ca%atio

n


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!ou +an7t run a pump 2ith su+tion!ou +an7t run a pump 2ith su+tion

an$ $is+harge %al%es +lose$#an$ $is+harge %al%es +lose$#


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/inimum Flo2/inimum Flo2

'(8- rpm '839- .EP Flo2'(8- rpm '839- .EP Flo2

8-- rpm -38- .EP Flo28-- rpm -38- .EP Flo2


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/a4imum Flo2/a4imum Flo2

''-3''8 .EP Flo2''-3''8 .EP Flo2


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Spee$Spee$


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Su+tion Pipe 0mmersionSu+tion Pipe 0mmersion


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EASTMAN

Avoi! Ma# Si$e %mpellersAvoi! Ma# Si$e %mpellers

Con+lusionsCon+lusions


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EASTMAN

Avoid Max Size ImpellersAvoid Max Size Impellers

&eep spee! to '()* ma#&eep spee! to '()* ma#



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EASTMAN


Keep speed to 1750 maxKeep speed to 1750 max

&eep +lo in !esign range&eep +lo in !esign range



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EASTMAN



Keep flow in design rangeKeep flow in design range

-rot yor baseplates-rot yor baseplates



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EASTMAN




Grout your aseplatesGrout your aseplates

se proper pipingse proper piping



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EASTMAN




Grout your aseplatesGrout your aseplates

!se proper piping!se proper piping

Avoi! hy!ralically in!ce! problems likeAvoi! hy!ralically in!ce! problems like

cavitation, an! sction an! !ischarge re/circlation,cavitation, an! sction an! !ischarge re/circlation,

sbmergence.sbmergence.



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8 PU/PS 3 , !R& /T.F

) PU/PS 3 8 !R& /T.F

'8 PU/PS 3 ; !R& /T.F

8 PU/PS 3 , !R& /T.F

) PU/PS 3 8 !R& /T.F

'8 PU/PS 3 ; !R& /T.F

Centrifugal Pump Vibrations

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