Flowserve WDX Manual de usuario descargar pdf (Pagina 38)

WDX USER INSTRUCTIONS ENGLISH 71576322 06-05

Page 38 of 46

7 FAULTS; CAUSES AND REMEDIES

FAULT SYMPTOM

Pump ov erheat s and s eize s

 Bearing s h av e sh ort l if e

 Pump v ib rat es or is noi s y

 M ech an ic al se al ha s short lif e

 M ech an ic al se al l ea ks ex ce ssiv el y

 Pump requir es ex ces siv e po wer

 Pump lose s prim e af t er st art ing

 In su f f icient pre ssu r e dev elop ed

 In su f f icient c apac it y del iv ered

 Pump does n o t de liv er liqu id



PROBABLE C AUSES POSSIBLE REMEDIES

A. System troubles

 

Pump not primed.

   

Pump or suction pipe not compl etel yfilled with

liquid.

Checkcomplete filling. Vent and/or prime.

   

Suction lift too high or level too low.

   

Insufficient margin between suction pr essure and

vapour pressure.

CheckNPSH

>NPSH

, proper submergence,

losses at strainers and fittings.

  

Excessive amount of air or gas in liquid. Checkand purge pipes and system.

  

Air or vapour pocket in suction line. Checksuction line design for vapour pockets.

 

Air leaks into suction line. Checksuction pipe is airtight.

 

Air leaks into pump through mechanical seal,

sleeve j oints, casing joint or pi pe plugs.

Checkand r eplace faulty parts.

CONSULT FLOWSERVE.

 

Foot valve too small. Investigate replacing the foot valve.

 

Foot valve partiall yclogged. Clean foot valve.

   

Inlet of suction pipe insufficientlysubmerged. Checkout system design.

  

Speed too l ow. CONSULT FLOWSERVE.



Speed too high. CONSULT FLOWSERVE.

  

Total head of system higher than differential head

of pump.



Total head of system l ower than pump design

head.

Checksysteml osses.

Remedyor CONSU LT FLOWSERVE.



Specific gravity of liquid differ ent from design.

  

Viscosity of liquid differs from that for which

designed.

Checkand CONSULT FLOWSERVE.

 

Operation at very low capacity.

Measure value and chec k minimum permitted.

Remedyor CONSU LT FLOWSERVE.

  

Operation at high capacity.

Measure value and chec k maximum per mitted.

Remedyor CONSU LT FLOWSERVE.

B. Mechanical troubles

     

Misalignment due to pipe str ain.

Checkthe flange connections and eliminate strai ns

using elastic couplings or a method permitted.



Improperl ydesigned foundation.

Checksetting of baseplate: tighten, adjust, grout

base as required.

    

Shaft bent.

Checkshaft runouts are within acceptable values.

CONSULT FLOWSERVE.

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