Dear all,
hi....
I have pump with specification as under,
Capacity - 20 m3/hr
Head - 40 m
RPM - 2900
Imp Dia - 190 mm
Vendor is supply this pump with efficiency 50 %, I don't get it how ?
Also power requirement as per vendor calculation is 6.09 KW, but my power calculation gives 5.74 KW ...
here i am confuse to cross check the pump and how to read PPC.
I think this is totally fine.
You calculated your fluid needs 5.74 kW, your vendor is saying your motor needs to supply 6.09 kW.
Thats an Efficiency of 94.3%. Thats pretty reasonable mechanical losses when we are talking about a motor spinning, then the bears on the shaft, the shaft coupling to motor (or even perhaps a belt/chain drive system) then moving into your pump shaft being rotated (again having bearing friction) and actuating whatever pump fluid component is being used (be it a piston, gears, centrifugal components) and the friction of those rotating with respect to their bearings / casings.
There is no cause for concern at all, in my opinion. I'd be much more concerned if your pump guy told you his pump was 100% mechanically efficient.