R and RX SLURRY Pump USER INSTRUCTIONS ENGLISH
71569242 03-11 (E)
Page 47 of 56
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7 FAULTS; CAUSES AND REMEDIES
FAULT SYMPTOM
P ump ove rhe ats a nd seizes
Be ar ing s have short li fe
P ump vib ra tes or i s noisy
Me ch an i ca l se al ha s sh or t l ife
M ech ani cal se al le ak s ex cessive ly
P ump requir e s exc essive p owe r
Pu mp l o se s pri me a fte r starti ng
I n su ffici en t pr e ssur e de velo ped
I n su ff i cien t capacity de li vered
P ump do es n ot d eli ve r li qui 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.
Shaft bent.
Check shaft runouts are within acceptable values.
CONSULT FLOWSERVE.