Flowserve DMX Manual de usuario descargar pdf (Pagina 47)

DMX/DMXD/DMXH/DMXDH USER INSTRUCTIONS ENGLISH 85392728 - 10/09

Page 47 of 60

7 FAULTS; CAUSES AND REMEDIES

FAULT SYMPTOM

Pump overheats and seizes

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Bearings have short 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 excessively

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Pump requires excessive power

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Pump loses prime after starting

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Insufficient pressure developed

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Insufficient capacity 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. Check complete filling. Vent and/or prime.

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Pump or suction pipe not completely filled

with liquid.

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Suction lift too high or level too low.

Check NPSHa>NPSHr, proper submergence, losses at

strainers and fittings

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Insufficient margin between suction pressure

and vapor pressure.

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

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Air or vapor pocket in suction line. Check suction line design for vapor 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 plugs.

Check and replace faulty parts.

CONSULT FLOWSERVE.

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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.

Check system losses.

Remedy or CONSULT FLOWSERVE.

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Total head of system lower than pump design

head.

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Specific gravity of liquid different from design.

Check and CONSULT FLOWSERVE.

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Viscosity of liquid differs from that for which

designed.

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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.

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Suction pressure too low, Foreign material in

suction line.

Open suction valve, Check power supply to correct voltage,

Dismantle suction line remove foreign material.

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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Misalignment due to improper pump/driver

setup.

Check alignment and correct as necessary.

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Improperly designed foundation.

Check setting of baseplate: tighten, adjust, grout base as

required.

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Flowserve DMX Manual de usuario Pagina 47

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