Flowserve CPXPM Instrukcja Użytkownika Pobierz pdf (Strona 24)

CPXPM USER INSTRUCTIONS ENGLISH 71569160 09-09

Page 24 of 28 flowserve.com

7 FAULTS; CAUSES AND REMEDIES

FAULT SYMPTOM

Pump overheats and seizes

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Bearings have sh ort life

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Pump vibrates or is noisy

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Mechanical seal has short life

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Mechanical seal leaks excessivel y

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Pump requires excessive power

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Pump does not s elf prime

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Insufficient pressure dev eloped

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Insufficient capaci t y delivered

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Pump does not deliver liquid

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PROBABLE CAUSES POSSIBLE REMEDIES

A. System troubles

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Pump not primed or filled with liquid. Check complete filling. Vent and/or prime.

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Suction lift too high or level too low.

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Insufficient margin between suction pressure and

vapour pressure.

Check NPSH

> NPSH

, proper submergence,

losses at strainers and fittings.

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

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

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

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Air leaks into pump through mechanical seal,

sleeve joints, casing joint or pipe lugs.

Check and replace faulty parts.

CONSULT FLOWSERVE.

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Suction pipe blocked. Check suction strainer/filter or pipe clear.

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

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Speed too low. CONSULT FLOWSERVE.

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Speed too high. CONSULT FLOWSERVE.

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Total head of system higher than differential head

of pump.

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Total head of system lower than pump design

head.

Check system losses.

Remedy or CONSULT FLOWSERVE.

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Specific gravity of liquid different from design.

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Viscosity of liquid differs from that for which

designed.

Check and CONSULT FLOWSERVE.

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Operation at very low capacity.

Measure value and check minimum permitted.

Remedy or CONSULT FLOWSERVE.

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Operation at high capacity.

Measure value and check maximum permitted.

Remedy or CONSULT FLOWSERVE.

B. Mechanical troubles

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Misalignment due to pipe strain.

Check the flange connections and eliminate strains

using elastic couplings or a method permitted.

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Improperly designed foundation.

Check setting of baseplate: tighten, adjust, grout

base as required.

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Shaft bent.

Check shaft runouts are within acceptable values.

CONSULT FLOWSERVE.

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Rotating part rubbing on stationary part internally. Check and CONSULT FLOWSERVE, if necessary.

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Bearings worn Replace bearings.

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