Troubleshooting - Franklin Electric RLCGF Manual Del Usuario

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
1) Excessive suction lift, must take in to consideration, the fol-
lowing:
a) Size and length of pipe
b) Density and temperature of liquid
c) Pipe fi ttings
d) Elevation above sea level
Including all of the above, we recommend the total suction
head not exceed 25 ft.
2) An excessively worn impeller is mainly caused from "cavita-
tion". Cavitation can be caused from a number of situations.
Examples:
a) Restricted suction
b) Excessive suction lift

TROUBLESHOOTING

PROBABLE CAUSE
The suction and/or discharge line(s) may be blocked
(4), or the valve(s) are closed, faulty,
and/or blocked.
The end of the suction line is not submerged.
Total head is too high for the pump.
No foot valve is being used.
Excessive suction lift (1).
Engine speed is too low.
Suction line is quite long. No foot valve is being used.
Air pockets or leaks may exist in the suction line.
Flow is restricted due to:
a) debris build-up (4)
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 (2).
Seal is damaged (3). Liquid will be leaking through
the adapter.
Air pockets or leaks in the suction line.
Clogged impeller (4).
Liquid level drops below the end of the suction
line. Foot valve is leaking - not holding water in
suction line.
CORRECTIVE ACTION
Check to see that the line and valves are in good
working order.
Increase its length, or move pump closer.
Reduce total head or use a "higher head" pump.
Move the pump closer to "pump from" source.
Increase the RPM.
Refer to "Starting the Pump", paragraph 3, under
"Operation". Check the line for loose connections.
Clean the lines and fi ttings.
Check to see that the valves are in good
working order.
Increase the 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 if using
fl exible hose, you may be able to move the
pump closer to the "pump from" source.
3) The seal may be damaged due to:
a) Normal wear
b) Overheating
c) Pumping chemicals that this seal is not designed for
4) In a dewatering application, a foot valve is recommended on
the suction line.
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