Flint & Walling Centrifugal Packages - end suction centrifugal pumps - Manual (Page 7)

7
95 North Oak Street • Kendallville, IN 46755
Copyright 2011. All Rights Reserved.
Troubleshooting Chart
Symptom
Possible Cause(s) Corrective Action
Low or no discharge 1. Incorrect rotation 1. Refer to wiring diagram
2. Insufficient inlet pressure or suction head
(NPSH Required)
2. Increase inlet pressure by adding more fluid to fluid
source. (See Spec’s for minimum NPSH Required)
3. Total head too high 3. Lower discharge head
4. Leak in suction line 4. Repair or replace
5. Impeller clogged or damaged 5. Clean or replace
6. Wrong size piping 6. Make needed adjustments
7. Casing gasket leaking 7. Replace gasket
8. Suction or discharge line valves closed 8. Open
9. Mechanical seal leaking 9. Replace
Loss of suction 1. Insufficient inlet ressure or suction head
(NPSH Required)
1. Increase inlet pressure by adding more fluid to fluid
source. (See Spec’s for minimum NPSH Required)
2. Clogged strainer 2. Clean or replace
Pump vibrates and/or
makes excessive noise 1. Mounting plate or foundation not rigid
enough
1. Reinforce
2. Foreign material in pump 2. Clean
3. Damaged impeller 3. Replace
4. Cavitation present 4. Check suction line for proper size and be sure valve is
open. Remove excessive loops in suction line. (See Spec’s
for minimum NPSH Required)
Pump leaks at shaft 1. Damaged or worn mechanical seal 1. Replace
2. Corrosion due to character of liquid
pumped
2. Discontinue pumping liquid and consult factory
Pump will not start or
run 1. Improperly wired 1. Refer to wiring diagram
2. Blown fuse or open circuit breaker 2. Replace fuse or close circuit breaker
3. Loose or broken wiring 3. Tighten connections and replace broken wiring
4. Impeller clogged 4. Clean
5. Motor shorted out 5. Replace
Motor problems 1. Various 1. Consult qualified electrician
2. Overloading motor. Too much water
delivery
2. Restrict outlet by closing down valve in discharge line
3. Liquid heavier and more viscous than
water
3. Consult factory
4. Seal binding 4. Replace
5. Rotor binding 5. Repair or replace
6. Voltage and frequency lower than rating 6. Reconnect to rated voltage and frequency
7. Defects in motor 7. Repair or replace
Pinholes in the casting.
Liquid dripsp around
seal area but is not seal 1. Cavitation caused by insufficient
inlet pressure or suction head (NPSH
Required)
1. Increase inlet pressure by adding a higher level of fluid
to source or increasing inlet pressure. (See Spec’s for
minimum NPSH Required)