Motor rating

Hello dhanya

No, the motor rating doesn't work out to be 1962kW. That is the electrical input power to the motor. The rating is the shaft output power, = pump input power.

But apart from that, I know VT pumps have good efficiency (compared with e.g. centrifs) but I didn't think they were quite as good as 90%. Though could be right for a big one like this.

I see nothing wrong in going for the 2200kW motor. It's always good to have power in hand, and it will only draw the power needed. Also your figures look like they're at duty point, but have you checked power at other points on the curve? VT pumps are different from centrifs in that power drawn increases with decreasing flow (increasing head) and there is often a sharp rise in power as you get close to zero flow (pump dead-headed). There's a good chance even 2200kW is too small for that condition. If that's the case you need to make sure closed-valve (or excessive head) conditions cannot occur.

Cheers..........Codey