HP 71576286 ユーザーズマニュアル
FP USER INSTRUCTIONS ENGLISH 71576286 - 07/06
Page 26 of 35
7 FAULTS; CAUSES AND REMEDIES
Insufficient flow rate
Irregular pump running
Driver overloaded
Mechanical seal leak
Equipment vibration
Excessive pump casing temperature
Irregular pump running
Driver overloaded
Mechanical seal leak
Equipment vibration
Excessive pump casing temperature
POSSIBLE CAUSES
SOLUTIONS
Pump or suction pipe not completely filled
- Check and complete filling
Air bubbles in pipes
- Check and desecrate the pipes
Suction level too low
- Check: the available NPSH > the required NPSH
- Reduce geometrical suction lift
- Reduce head losses in pipes and in fittings (diameter
- 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
- Check the immersion head of the suction valve
Wrong rotation
- Reverse 2 phases on motor terminal boxes
The motor is running on 2 phases only
- Check and control the motor electrical power supply
Motor running too low
- Check the connection in the terminal box according to the
voltage
Total manometric head system higher than
pump differential head
pump differential head
- Check the discharge head
- Check the head losses in discharge pipes (partly closed valve,
- Check the head losses in discharge pipes (partly closed valve,
foreign particles, back pressure too high)
- Modify the installation or change the pump set
Total manometric head system lower than
pump differential head
pump differential head
-Throttle at discharge valve or trim the impeller (contact our
local agent) CONSULT FLOWSERVE
Pipes (valves, filter...)
- Control, dismantle and clean
Insufficient flow rate
- Check the suction and discharge pipes (valves, back
pressure)
Worn wear-ring surfaces
- Foresee pump mending. CONSULT FLOWSERVE
Seizure, jamming
- CONSULT FLOWSERVE
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
- Mechanical seal: CONSULT FLOWSERVE
Defective motor bearings
- CONSULT FLOWSERVE
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
Rotation speed too low (check the driver)
- Check the connection in the terminal box according to the
voltage
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
- 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
- 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
- Mechanical seal: CONSULT FLOWSERVE
Defective gasket
- CONSULT FLOWSERVE