Wanner Engineering, Inc.
14
United States
Instant Information: www.stancorpump.com
(61) 33-5681 Fax (61) 33-6937
SCM-991-400A
Problem
Possible Cause
Remedy
Pump Does Not Prime
Fluid not reaching pump
Verify suction pipe is submerged
Open suction valve
Wrong direction of rotation
Reverse motor leads
No Discharge
Valves closed
Verify valves are open
Bypass valve open
Adjust by pass valve
Air leak in suction
Tighten connections
Apply sealant to all threads
Verify suction pipe is submerged
Clogged strainer
Clean strainer
Pump is worn
Rebuild pump
Magnetic coupling broken free
Stop pump. Wait until there is no rotation and
restart pump
NPSH problems
Inlet pressure too low
Verify suction pipe is not too long
Insufficient Discharge
Insufficient flow
Fully open suction valves
Clogged strainer
Clean strainer
Speed too low
Increase driver speed if possible
Pump not sized to application
A larger pump may be required
Bypass valve open
Adjust bypass valve
Pump worn
Rebuild pump
Loss of Suction After
Change in fluid properties
Verify fluid properties
Satisfactory Operation
Air leak in suction
Tighten connections
Verify suction pipe is submerged
Excessive Power
Head lower than rated
Reduce flow
Consumption
Liquid to heavy
Check specific gravity and viscosity
Worn or damaged parts
Service unit
Rapid Pump Wear
Abrasives in fluid
Erosion
Materials of construction not
suitable for fluid being pumped
Troubleshooting
