Flowserve BP Uživatelský manuál stáhnout pdf (Strana 37)

BP USER INSTRUCTIONS ENGLISH 85392725 10-09 (E)

Page 37 of 44 flowserve.com

7 FAULTS; CAUSES AND REMEDIES

FAULT SYMPTOM

Pump overheats and seizes

Bearings have short life or are damaged

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 PROBABLE REMEDIES



A. System troubles

● ●

Pump not primed.

● ● ● ●

Pump or suction pipe not completely filled

with liquid.

Check complete filling. Vent and/or prime.

● ● ● ●

Suction lift too high or level too low.

● ● ● ●

Insufficient margin between suction pressure

and vapor pressure.

Check NPSHa>NPSHr, proper submergence,

looses at strainers/fittings.

● ● ●

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

● ● ●

Air or vapor 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.

● ● ● ●

Discharge or suction valve is closed. Open the valve.

● ●

Suction valve too small. Investigate replacing the Suction valve.

● ●

Suction valve, strainer or suction piping

partially clogged.

Clean Suction valve, strainer, suction piping.

● ● ● ●

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.

●

Total head of system lower than pump design

head.

Check system losses. Remedy or CONSULT

FLOWSERVE.

●

Specific gravity of liquid different from design.

● ● ●

Viscosity of liquid different from that for which

designed.

Check and CONSULT FLOWSERVE.

● ●

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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