Pump head and flow rate relation

[eaaaazizo]

i need some help becoase i become confused
according to pump characteristic curve if the flow rate increased the head will decreased
the question is how i can increase the flow rate and what is the relation of RPM with head and flow rate

 

[russ_watters]

Have a look at the pump affinity laws: http://www.engineeringtoolbox.com/affinity-laws-d_408.html

 

[eaaaazizo]

Have a look at the pump affinity laws: http://www.engineeringtoolbox.com/affinity-laws-d_408.html

thank u for ur answer but this link is speake about changing rpms it is available to change the pump head by change pump capacity with constant RPM and how ?

 

[russ_watters]

By combining the first and second equations, you get an equation that tells you that by lowering the pressure resistance in the system, you'll get an increase in flow.