Advertisement
SHURflo Operating Instructions, Performance,
Specifications and Parts Manual
SHURflo Corrosion-Resistant Pedestal Centrifugal Pumps
®
Noryl
Series and Polypropylene Series
Troubleshooting Chart
Symptom
Pump will not prime or retain prime
after operating
Flow rate is low
Pump runs but there is no fluid
Liquid drips from point where shaft
enters the pump casing, when
pump is full of liquid
The pump starts and stops pumping
Excessive noise while pump is in
operation
Pump runs but
poor performance
Pump Installation
Do not run the pump
dry! Check pump
rotation before operating. Pump rotation
should be clockwise as seen from shaft
end. Reverse rotation can result in severe
pump damage.
1. Position the pump as close as possi-
ble to the source being pumped.
A flooded suction situation is
required. The pump is NOT self-
priming, therefore, if the fluid
level is below the pump, a foot
valve must be installed and the
pump primed prior to start-up.
Form L-4074 (12/09)
Probable Cause(s)
1. Air Leak in suction line
2. Clogged strainer
3. Leaky foot valve
1. Incorrect speed
2. Piping is fouled or damaged
3. Clogged impeller or worn impeller
4. Discharge line restricted or undersized
5. High discharge pressure
1. Faulty suction piping
2. Pump is located too far from the fluid source
3. Gate valve is closed
4. Clogged strainer
5. Fouled foot valve
6. Discharge height is too great
7. Suction lift is too great
8. Reverse rotation
1. Damaged mechanical seal
2. Liquid not compatible with seal
1. Fouled impeller
2. Faulty mechanical seal
3. Leak in the suction line
4. Leak in the foot valve
5. Impeller spun off and jammed against housing 5. Check motor rotation
1. Pump not secured to firm foundation
2. Piping not supported to relieve any
strain on the pump assembly
3. Restricted suction line
4. Cavitation
1. Check pump rotation to see if it is CCW
as viewed from motor face. On three-phase
motors, rotation must be checked prior to
running pump under load.
Failure to check rotation before pump is run can result in severe damage to the pump and motor unit.
2. Mount the pedestal base to a
secure, immobile foundation.
3. Use only composite fittings on
both the intake and discharge
ports. Seal the pipe connections
with Teflon™ tape. These fittings
should be self-supported and in
neutral alignment with each port.
Fittings must not be forced into
alignment because it may cause
premature line failure or damage
to the pump housing volute.
4. Never choke the intake. Keep both
input and discharge lines as free of
elbows and valves as much as pos-
1. Repair or replace suction line
2. Clean or replace strainer
3. Clean, repair or replace foot valve
1. Check drive
2. Clean or replace
3. Clean or replace
4. Flush out piping or replace
5. Check and reduce
1. Replace
2. Relocate
3. Open
4. Clean or replace
5. Clean or replace
6. Lower the height
7. Lower the pump
8. Reverse rotation
1. Replace mechanical seal
2. Check compatibility; use components
that are compatible
1. Clean
2. Replace
3. Repair
4. Repair or replace
Reverse if necessary
1. Secure properly
2. Make necessary adjustments
3. Clean or correct
4. a. Reduce speed
b. Increase inlet size
c. Use thinner material
1. On three-phase motors, switch any two
motor wire leads to reverse rotation.
6
Noryl and Polypropylene Models
Corrective Action
sible. Always use an adequate
diameter pipe. This will reduce fric-
tion losses and maximize output.
5. For positive pump start-up upon
intial installation or after pump
has been maintained or fluid
drained from pump, fill pump with
water or liquid compatible with
pumped material. This is accom-
plished by installing a "T" fitting
on the discharge with the fill por-
tion of the fitting facing up.
Advertisement
