Hello all of you
At our facility we have five centrifugal pumps Operating in parallel . Some times the overall load is such that the pumps operate on lower than rated flow . I therefore studying feasibility for installation of VFD in one of the pump so that variation in load could be adjusted and power could be saved .
Main feature for our system are as follow :
System pressure is governed by static head
It is an explosive liquid
All pumps are identical and having rated flow and head respectively 400 m3/hr and 2090m (fluid density is 460Kg/m3)
My doubts in this regard and for your kind attention are as follow :
1. I have a understanding that while we lower the RPM of one of the pumps running in parallel , that pump start to follow all new Characteristic curve and deliver a flow at common header pressure according to new curve. I seek somebody to verify and add to this understanding .
2. How could I relate efficiency of the pump at various flow with reduced RPM, does it remain constant with varying flow .
3. Can somebody suggest a road map for finding out power saving through it .