While the manufacturer is ultimately to be consulted , to help you deal with him, following reference may be useful:
'Water intakes for circulating water pumps '- Pub. by BHRA(British Hydromechanics Research Association) - gives typical proportions for suction bells.
Good luck
Vishy.
I presume u r referring to a centrifugal pump.The system resistance against which the pump has to work may be higher than what u hd expected.This can be confirmed from the reading of the pressure gauge at pump discharge.You hv the following options:
1) Reduce the system resistance
2) Use...
A very detailed treatment of jet pumps is given in the well-known " Pump Handbook " by Karassik,Messina,Cooper.Published by McGraw-Hill.
Vishy.