Flowserve FRBH Uživatelský manuál stáhnout pdf (Strana 42)

FRBH, FRBHX AND FRBHS USER INSTRUCTIONS ENGLISH 71569178 10-04

Page 42 of 54

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.

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

vapour pressure.

Check NPSHa>NPSHr, proper submergence,

losses at strainers/fittings.

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.

Foot valve too small. Investigate replacing the foot valve.

Foot valve partially clogged. Clean foot valve.

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 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.

Operation at high capacity. Measure value and check maximum permitted.

Remedy or CONSULT FLOWSERVE.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 53 54

Komentáře k této Příručce

Žádné komentáře

Flowserve FRBH Uživatelský manuál Strana 42

Komentáře k této Příručce

Související produkty a manuály pro Čerpadla Flowserve FRBH