SPP Pumps Auto Prime - High Flow Range XF300 & 400 - Manual (Page 16)

Manual No/Rev
W77-009E / 2
Operators Instructions for
XF300 & XF400 Range Centrifugal Pumps
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 16 of 23
7. FAULT FINDING & REMEDIAL ACTION
7.1 Priming System Faults
Check pump drain valve is closed.
Check vacuum pump is operating,
if not rectify or replace the pump.
Disconnect vacuum hose and take a
vacuum reading, refit the hose and
fit vacuum gauge to the pump inlet
and take another vacuum reading.
Pump Fails to Prime
Are vacuum gauge
readings the same?
Stop pump and listen for air leaks.
Stop any air leaks found.
Remove vacuum hose and check for
collapsed internal hose lining.
Replace hose if faulty.
Check air filter for blockage.
Clean housing or replace filter.
Check non return valve is seating.
Remove any debris found.
Check the mechanical seals.
Replace if leaking or faulty.
NO
Check the suction hose for internal
collapse.
Replace any faulty hose.
Check suction intake for blockage.
Clear blockage, using back flush where
provided.
Check that the static suction lift does
not exceed the pump capabilities, if so -
Reposition pump closer to the liquid level.
YES
Check that the static suction lift does not exceed the pump capabilities, if so-
Reposition pump closer to the liquid level .
Check that the delivery head is not higher than the pump capability, if so -
Raise the pump if possible or install a pump with higher head rating.
Check suction intake or pipes for blockage, also check impeller for blockage.
Clear blockage, using back flush where provided.
Check non return valve is n ot blocked.
Remove any debris found.
Check that pump speed is correct.
Adjust driver to give correct speed.
Check the impeller for wear or damage,
Replace impeller if worn.
Check liquid viscosity and density, if greater than water, the pumped head
will be reduced.
Pump runs with low flow
Check that the impeller is not blocked.
Clear any impeller blockage.
Check non return valve is not blocked.
Remove any debris found.
Check for a suction air leak.
Cure air leaks as required.
Pump surges with intermittent flow
If further faults are evident, refer to the following pump fault finding tables