Flowserve Type R Bedienungsanleitung PDF herunterladen (Seite 47)

R and RX SLURRY Pump USER INSTRUCTIONS ENGLISH 71569242 03-11 (E)

Page 47 of 56 flowserve.com

7 FAULTS; CAUSES AND REMEDIES

FAULT SYMPTOM

Pump overheats and seizes



Bearings have short life



Pump vibrates or is noisy



Mechanical seal has short life



Mechanical seal leaks excessively



Pump requires excessive power



Pump loses prime after starting



Insufficient pressure developed



Insufficient capacity delivered



Pump does not deliver liquid



PROBABLE CAUSES POSSIBLE REMEDIES

A. System troubles



Pump not primed.

Check complete filling. Vent and/or prime.



 

Pump or suction pipe not completely filled with

liquid.



 

Suction lift too high or level too low.

Check NPSHa>NPSHr, proper submergence,

losses at strainers/fittings.



 

Insufficient margin between suction pressure and

vapour pressure.

  

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



 

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



Air leaks into suction line. Check suction pipe is airtight.



Air leaks into pump through mechanical seal,

sleeve joints, casing joint or pipe plugs.

Check and replace faulty parts.

CONSULT FLOWSERVE.



Foot valve too small. Investigate replacing the foot valve.



Foot valve partially clogged. Clean foot valve.



 

Inlet of suction pipe insufficiently submerged. Check out system design.

  

Speed too low. CONSULT FLOWSERVE.



Speed too high. CONSULT FLOWSERVE.

  

Total head of system higher than differential head

of pump.

Check system losses.

Remedy or CONSULT FLOWSERVE.



Total head of system lower than pump design

head.



Specific gravity of liquid different from design.

Check and CONSULT FLOWSERVE.



 

Viscosity of liquid differs from that for which

designed.



Operation at very low capacity. Measure value and check minimum permitted.

Remedy or CONSULT FLOWSERVE.

 



Operation at high capacity. Measure value and check maximum permitted.

Remedy or CONSULT FLOWSERVE.

B. Mechanical troubles

     

Misalignment due to pipe strain. Check the flange connections and eliminate strains

using elastic couplings or a method permitted.



Improperly designed foundation. Check setting of baseplate: tighten, adjust, grout

base as required.

    

Shaft bent. Check shaft runouts are within acceptable values.

CONSULT FLOWSERVE.

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