Flowserve MEN Uživatelský manuál stáhnout pdf (Strana 31)

MEN

USER INSTRUCTIONS ENGLISH 71576288 – 11-09

Page 31 of 36

7 FAULTS; CAUSES AND REMEDIES

7.1 Faults on the pump

Insufficient flow rate

Irregular pump running

Driver overloaded

Mechanical seal leak

Equipment vibration

Excessive pump casing temperature

POSSIBLE CAUSES SOLUTIONS

x x x X

Pump or suction pipe not completely filled - Check and complete filling

X X X

Air bubbles in pipes - Check and desecrate the pipes

X X

Suction level too low - Check: the available NPSH > the required NPSH

- Reduce geometrical suction lift

- Reduce head losses in pipes and in fittings (diameter

increase and appropriate fitting positions)

- Check valves and strainers

- Check the immersion head of the suction valve

X X

Total manometric head system higher than

pump differential head

- Check the discharge head

- Check the head losses in discharge pipes (partly closed valve,

foreign particles, back pressure too high)

- Modify the installation or change the pump set

X X

Total manometric head system lower than

pump differential head

-Throttle at discharge valve or trim the impeller (contact our

local agent) CONSULT FLOWSERVE

X X

Pipes (valves, filter...) - Control, dismantle and clean

Insufficient flow rate - Check the suction and discharge pipes (valves, back

pressure)

X Worn wear-ring surfaces - Foresee pump mending. CONSULT FLOWSERVE

X X X

Seizure, jamming - CONSULT FLOWSERVE

X X X

Excessive strains on flanges - Check the flange connections and eliminate strains (pipe

positioning or elastic sleeves mounting)

Defective gland packing on the shaft - Check and replace all the gland packing parts

- Mechanical seal: CONSULT FLOWSERVE

X X X

Defective motor bearings - CONSULT FLOWSERVE

X X

Specific gravity or viscosity of liquid too high - Consult our local agent to analyze the problem

Misalignment - Check the alignment of the pump and of its driver

Foundations not sufficiently rigid - Check the setting of base plates: tightening, bad adjustment,

seal

Insufficient pressure

Pump looses prime after starting

POSSIBLE CAUSES SOLUTIONS

Presence of air - Check and de-aerate

Suction pressure insufficient - Check: the available NPSH > the required

NPSH

Mechanical defects - CONSULT FLOWSERVE

Air leak in the suction pipe - Check suction pipe is airtight

Restriction in suction pipe - Check diameter of suction pipe

Suction level too low - Check the NPSH >NPSH

- Reduce geometrical suction lift

- Reduce head losses in pipes and in fittings

(diameter increase and appropriate fitting

positions)

- Check valves and strainers

- Check the immersion head of the suction valve

Obstruction of suction pipe - Check condition of pipe

Defective gland packing on the shaft - Check and replace all the gland packing.

- Mechanical seal: CONSULT FLOWSERVE

Defective gasket - CONSULT FLOWSERVE

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