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 |
| |
|
| | | 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 increase |
|
|
|
|
|
|
|
|
| and appropriate fitting positions) |
|
|
|
|
|
|
|
|
| - Check valves and strainers |
|
|
|
|
|
|
|
|
| - 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 | - Check the discharge head | |
|
|
|
|
|
|
|
| pump differential 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 |
|
|
|
| |
| |
| Total manometric head system lower than | |
|
|
|
|
|
|
|
| pump differential head | local agent): CONSULT FLOWSERVE |
|
|
|
|
| | | Pipes (valves, filter...) | - Control, dismantle and clean | |
|
|
|
|
|
| | | Insufficient flow rate | - Check the suction and discharge pipes (valves, back |
|
|
|
|
|
|
|
|
| pressure) |
|
|
|
|
|
|
| Worn | - 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 |
|
|
|
|
|
|
|
|
| - 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 | ||||||
|
|
|
| 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 | |||||
Page 25 of 28 | flowserve.com |