Flowserve LNGT Bedienungsanleitung PDF herunterladen (Seite 37)

LNGT USER INSTRUCTIONS ENGLISH 00083107 02-08

Page 37 of 48

7 FAULTS; CAUSES AND REMEDIES

FAULT SYMPTOM

Pump overheats and seizes

⇓

Bearings have short life

⇓

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 POSSIBLE REMEDIES

A. System troubles

Pump not primed.

z z

Pump or suction pipe not completely filled with

liquid.

Check complete filling. Vent and/or prime.

z z

Suction lift too high or level too low.

z z

Insufficient margin between suction pressure and

vapor pressure.

Check NPSH

>NPSH

, proper submergence,

losses at strainers and fittings.

z z z

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

z z

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

z z

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

z z z

Speed too low. CONSULT FLOWSERVE.

Speed too high. CONSULT FLOWSERVE.

z z z

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.

z z

Viscosity of liquid differs from that for which

designed.

Check and CONSULT FLOWSERVE.

Operation at very low capacity.

Measure value and check minimum permitted.

Remedy or CONSULT FLOWSERVE.

z z

Operation at high capacity.

Measure value and check maximum permitted.

Remedy or CONSULT FLOWSERVE.

B. Mechanical troubles

z z z z z z

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.

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