SPXFLOW Universal 5000 Industrial Series, Instruction Manual

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95-03012
Problem Probable Causes Solutions
No flow, pump "Air" lock. Fluids which "gas off", Manual or automatic air bleed from
not priming or vaporize, or allow gas to come pump or lines near pump
out of solution during off periods
Extra clearance rotors, worn pump Increase pump speed, use foot
valve to improve priming
Net inlet pressure available too low Check NIPA, NIPR~, recalculate
system. Change inlet system as
needed.
On "Vacuum'' inlet system: On Install check valve in discharge line
initial start-up, atmospheric "blow
back'' prevents pump from
developing enough differential
pressure to start flow.
No flow Relief valve not properly adjusted, Adjust or clear valve
or held off seat by foreign material
(flow is being recirculated to inlet)
Insufficient flow Speed too low to obtain Check flow-speed curve
desired flow
Air leak due to bad seals or Replace seals, check inlet fittings.
pipe connections
Fluid vaporization Strainers, foot valves, inlet fittings Clear lines. If problem continues,
("starved'' pump inlet) or lines clogged inlet system may require change
Inlet line size too small, inlet line Increase inlet line size. Reduce length,
too long. Too many fittings minimize direction and size changes,
or valves. Foot valve, strainers reduce number of fittings.
too small .
NIPA too low Raise liquid level in source tank
NIPA too low Increase by raising or pressurizing
source tank
NIPA - Net Inlet Pressure Available at Pump
NIPR - Net Inlet Pressure Required by Pump
TROUBLESHOOTING