Ebsray V Series, Installation, Operation & Maintenance Instructions Manual

Page: 10 / 12

10
SECTION 6
– TROUBLESHOOTING
Symptom
Possible
Problem
Possible Cause Remedy
No Liquid
Delivery
Pump not operating No power to drive shaft Check driver
Coupling damaged or disengaged Repair/replace coupling
Pump will not turn
–
locked up
Foreign matter in pump Clean out pump
– check strainer in
suction line.
Vanes/Pushrods broken
Clean pump and replace
Vanes/Pushrods
Ball Bearings seized Replace Ball Bearings.
With pump operating Inlet/Discharge valves closed
Open valves
No liquid in supply tank Fill supply tank
Incorrect direction of rotation Ensure correct direction of rotation
Suction filter/strainer blocked or
leaking air Clean filter/strainer and/or eliminate air
leaks
High static discharge pressure Review system design
Inadequate NPSHa Increase NPSHa
Pump vapour locked Clear vapour to enable pump to prime
Reduced
Output
Pump speed too slow Incorrect driver speed Replace/adjust driver
Faulty driver Replace/repair as required
High differential
pressure Restriction in discharge piping or
pipe/hose too small. Remove restriction and/or replace with
adequate size pipe/hose
Restriction in inlet line Strainer blocked Clean/clear strainer
Inlet pipe too small or too long Modify piping
Foreign object in suction line Remove restriction
Incorrectly set external
Bypass Valve or
internal Pressure
Relief Valve Valve pressure setting too low Adjust pressure setting but do NOT
exceed system design pressure or driver
capability
Vanes jamming Foreign matter in pump or damaged
vanes Clean out pump and/or replace vanes
Pump parts worn End of service life or adverse
pumping conditions Recondition pump
Excessive
Power
Consumpti
on
Obstruction is
discharge line Foreign matter in discharge line Clean or clear out discharge line
Collapsed or kinked discharge hose Replace hose or remove kinks
Operating outside duty
point Pressure, Viscosity, Temperature
and/or Speed not as specified Correct as required
Rotating parts binding
Foreign matter jamming parts or
parts worn
Disassemble, inspect and rectify
Misalignment between
pump and driver Pump and/or driver moved Check and realign as required.
Ball Bearings worn End of service life or adverse
pumping conditions Replace Ball Bearings
Pump is
Noisy
Cavitation
Insufficient NPSH available Increase NPSHa
Air leakage in suction line Remove air leakage
Pump running dry No liquid in supply tank Fill supply tank
Closed inlet line valve Open inlet line valve
Rotating parts binding Foreign matter jamming parts or
parts worn Disassemble, inspect and rectify
Ball bearings worn End of service life or adverse
pumping conditions Replace ball bearings
Pump speed too fast Incorrect drive speed Reduce drive speed