Pump Specific speed and efficiency
Pump Specific speed and efficiency
(OP)
Hi,
I am using PSAT software from US DOE.
I want to know whether there is effciency penalty if specific speed is low as well as when it is high.
I had seen a graph showing specific speed on x-axis , pump efficiency on y-axis and a number of curves ( almost similar to motor eff. curves) for different flows. I think that was from Hydraulic institute. In that graph the efficiency increases with specific speed and flow. Tell me if this is true ( that efficiency will always be more for higher specific speed). In that case why a penalty for high specific speed?
Aslo please guide me to a relationship giving maximum achievable efficiency of a pump for a given head, flow and speed.
Thanks in advance
I am using PSAT software from US DOE.
I want to know whether there is effciency penalty if specific speed is low as well as when it is high.
I had seen a graph showing specific speed on x-axis , pump efficiency on y-axis and a number of curves ( almost similar to motor eff. curves) for different flows. I think that was from Hydraulic institute. In that graph the efficiency increases with specific speed and flow. Tell me if this is true ( that efficiency will always be more for higher specific speed). In that case why a penalty for high specific speed?
Aslo please guide me to a relationship giving maximum achievable efficiency of a pump for a given head, flow and speed.
Thanks in advance





RE: Pump Specific speed and efficiency
I suggest that you re-post this question on the "pump engineering" forum on this website.....
MJC
RE: Pump Specific speed and efficiency
RE: Pump Specific speed and efficiency
The maximum hydraulic efficiency for 2600 specific speed at 10,000+ GPM is 90-92% vice 86%.