Flowserve MP1 Sier-Bath - Manual (Page 36)

MP1 USER INSTRUCTIONS ENGLISH 26999958 – 10-12
Page 36 of 48 flowserve.com
7 FAULTS; CAUSES AND REMEDIES
FAULT SYMPTOM
P u mp o v er h e at s an d s ei z es
 B e ar i n g s h av e s h o r t l i f e
 P u mp v i b r at e s o r i s n o i sy
 M ech an i c al s e al h a s sh o r t l i f e
 M ech an i c al s e al l e ak s e xc e s si v e l y
 P u mp r eq u i r e s ex c es s i v e p o w er
 P u mp l o s e s p r i m e af t er s t ar t i n g
 I n su f f i ci en t p r es su r e d ev e l o p ed
 I n su f f i ci en t c ap a ci t y d el i v er ed
 P u mp d o e s n o t d el i v er l i q u i d

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.
    Rotating part rubbing on stationary part internally. Check and CONSULT FLOWSERVE, if necessary.