8.
TROUBLESHOOTING
Tapflo LPX series
55
Noisy operation caused by
mechanical problems.
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
(‘’starved’’ pump inlet) lower Net
Inlet Pressure Required.
Fluid viscosity greater than
expected.
Reduce pump speed and accept
lower flow or change system to
reduce line losses.
Increase 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.
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.
Hot (HC) or extra clearance rotors
on ‘”cold’’ fluid, and/or low viscosity
fluid.
Replace with standard clearance
rotors.
Worn pump.
Increase pump speed (within limits).
Replace rotors, have pump
remanufactured.
High pressure.
Reduce pressure by adjusting
system settings or hardware.
Noisy operation caused by fluid.
Cavitation due to high fluid
viscosity.
High vapor pressure fluid.
High temperature.
Slow down pump, reduce
temperature, change system setup.
Cavitation due to Net Inlet Pressure
Available less than Net Inlet
Pressure Required.
Increase NIPA - Net Inlet Pressure
Required or reduce NIPR - Net Inlet
Pressure Required. Contact
customer service if necessary.
Air or gas in fluid caused by leaks in
the piping.
Check system and fix any leaks.
Air or gas in fluid caused by
dissolved gas or naturally aerated
products.
Minimize discharge pressure (also
see Cavitation).
Noisy operation caused by
mechanical problems.
Rotor to body contact due to
improper assembly of pump.
Check clearances and adjust
shimming.
Rotor to body contact caused by
distortion of pump due to improper
piping installation.
Change piping installation to
eliminate piping stress and
distortion on body.
Pressures required higher than the
pump is rated for.
Reduce discharge pressure required.
Summary of Contents for LPX Series
Page 59: ...9 PARTS LISTS Tapflo LPX series 59 9 3 Model 25 1 to 50 1 Pump Parts B exploded view ...
Page 61: ...9 PARTS LISTS Tapflo LPX series 61 9 5 Model 50 2 to 100 1 Pump Parts A exploded view ...
Page 63: ...9 PARTS LISTS Tapflo LPX series 63 9 7 Model 50 2 to 100 1 Pump Parts B exploded view ...
Page 69: ...Tapflo LPX series 69 ...