FRBH, FRBHX AND FRBHS USER INSTRUCTIONS ENGLISH 71569178 20-08
Page 49 of 60 Flowserve.com
7 FAULTS; CAUSES AND REMEDIES
Pu mp o v er h e at s an d s e i z e s
B e ar i n g s h a v e s hor t l i f e
Pu mp v ib r a t e s o r i s n o i s y
M e c h a n i c a l s e al h a s s h o r t l i f e
M e c h a n i c a l s e al l e a k s e x c e s s i v e l y
Pu mp r e q u i r e s e x c es s i v e p o w e r
Pu mp l o s e s p r i m e af t e r s t a r t i n g
In suf f i c i e n t p r es s u r e d ev e l o p e d
In suf f i c i e n t c a p a ci t y d e l i v er e d
Pu mp d o e s n ot d el iv e r li q u i d
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.
Investigate replacing the foot valve.
Foot valve partially clogged.
Inlet of suction pipe insufficiently submerged.
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.
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