Waukesha Cherry-Burrell
®
Brand Universal 3 Pump Troubleshooting
11/2018 95-03103 Page 95
Insufficient flow Speed too low or too high to
obtain desired flow.
Check flow-speed curve (available from
SPX FLOW website) and adjust as
necessary.
Air leak due to bad seals, pipe
connections, or other equipment.
Replace seals, check inlet fittings.
Insufficient flow—flow
being bypassed
somewhere
Flow diverted in branch line,
open valve, etc.
Check system and controls
Relief valve not adjusted or
jammed.
Clear or adjust valve.
Insufficient flow—high slip Standard clearance rotors on
"cold" fluid and/or low viscosity
fluid.
Replace with low viscosity rotors.
Worn pump. Increase pump speed (within limits).
Replace rotors
High pressure. Reduce pressure by adjusting system
settings or hardware.
Fluid vaporization
(“starved'' pump inlet)
Strainers, foot valves, inlet
fittings or lines clogged.
Clear lines. If problem continues, inlet
system may require changing.
Inlet line size too small, inlet line
too long. Too many fittings or
valves. Foot valve, strainers too
small.
Increase inlet line size. Reduce length,
minimize direction and size changes,
reduce number of fittings.
NIPA - Net Inlet Pressure
Available at Pump is too low.
Raise liquid level in source tank to
increase Net Inlet Pressure (NIPA).
Increase Net Inlet Pressure Available at
Pump by raising or pressurizing
source tank.
Select larger pump size with lower Net
Inlet Pressure Required.
Fluid viscosity greater than
expected.
Reduce pump speed and accept lower
flow, or change system to reduce line
losses.
Change temperature of product to
reduce viscosity.
Fluid temperature higher than
expected (vapor pressure
higher).
Reduce temperature, reduce speed
and accept lower flow or change
system to increase Net Inlet Pressure
Available.
PROBLEM POSSIBLE CAUSE SUGGESTED ACTION
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