NM USER INSTRUCTIONS ENGLISH 71576289 - 11/09

Page 31 of 48

7 FAULTS; CAUSES AND REMEDIES

Insufficient flow rate

Irregular pump running

Driver overloaded

Mechanical seal leak

Equipment vibration

Excessive pump casing temperature

POSSIBLE CAUSES SOLUTIONS

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

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Air bubbles in pipes - Check and desecrate the pipes

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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

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Wrong rotation - Reverse 2 phases on motor terminal boxes

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The motor is running on 2 phases only - Check and control the motor electrical power supply

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Motor running too low

- Check the connection in the terminal box according to the

voltage

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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

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Total manometric head system lower than

pump differential head

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

local agent): CONSULT FLOWSERVE

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

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Insufficient flow rate

- Check the suction and discharge pipes (valves, back

pressure)

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

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Seizure, jamming - CONSULT FLOWSERVE

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Excessive strains on flanges

- Check the flange connections and eliminate strains (pipe

positioning or elastic sleeves mounting)

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

- Mechanical seal: CONSULT FLOWSERVE

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Defective motor bearings - CONSULT FLOWSERVE

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

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

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Foundations not sufficiently rigid

- Check the setting of base plates: tightening, bad adjustment,

seal

Insufficient pressure

Pump looses prime after starting

POSSIBLE CAUSES SOLUTIONS

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Rotation speed too low (check the driver)

- Check the connection in the terminal box according to the

voltage

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Presence of air - Check and deaerate

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

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Mechanical defects - CONSULT FLOWSERVE

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

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Restriction in suction pipe - Check diameter of suction pipe

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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

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Obstruction of suction pipe - Check condition of pipe

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

- Mechanical seal: CONSULT FLOWSERVE

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Defective gasket - CONSULT FLOWSERVE

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 47 48

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