Troubleshooting - Franklin Electric FBSGF Series Owner's Manual

PROBLEM
Pump will not pump
Pump doesn't catch prime
Priming takes a long time
Pump does not perform as well as it
should
Pump loses prime
Fig. 2
Fig. 3

TROUBLESHOOTING

PROBABLE CAUSE
Air leak in suction line.
The suction and/or discharge line(s) may be blocked, or
the valve(s) are closed, faulty and/or blocked.
End of suction line is not submerged.
Total head is too high for this pump to work against.
Excessive suction lift*.
Suction line is quite long.
Air pockets or leaks in the suction line.
Flow is restricted due to:
a) Debris build-up.
b) Faulty or semi-open valve(s).
c) Piping/hosing used is smaller than the thread sizes
on the pump.
Insuffi cient submergence of the end of the suction line.
Excessively worn impeller**.
Seal is damaged***. Liquid will be leakingthrough the
middle of the adapter.
Air pockets or leaks in the suction line.
Clogged impeller.
Liquid level drops below the end of the suction line.
ADAPTER POSITION
Wrong
Make sure suction hose is double-clamped at joints, clamps
are tight, fi ttings have thread compound and are tight, no
nicks or cuts in hose.
Check to see that the lines and valves are in good work-
ing order.
Increase its length, or move pump closer to source of
liquid.
Reduce total head or use a higher-head pump.
Move the pump closer to liquid source.
Refer to "start-up" under operation.
Check the line for loose connections.
a) Clean the lines and fi ttings.
b) Check to see that the valves are in good working order.
c) Increase size of hose/pipe to reduce friction losses.
The end of the suction line must be submerged.
Replace impeller.
Replace seal.
Check suction line.
Remove casing to clean out.
Increase length of suction line or move the pump closer
to the liquid source.
*Excessive suction lift must take into consideration:
a) Size and length of pipe
b) Density and temperature of liquid
c) Pipe fi tting
d) Elevation above sea level
Including all of the above, we recommend that the total suction
head not exceed 25 ft.
**An excessively worn impeller is mainly caused from
cavitation which is caused by a number of situations.
Examples:
a) Restricted suction
b) Excessive suction lift
***The seal may be damaged due to:
a) Normal wear
b) Overheating
c) Pumping chemicals that this seal is not designed for
Correct
3
CORRECTIVE ACTION