How can you design a fire fitting pump?

It might be just one of semantics. Both a fire fighting pump and a fire water pump pump water to fight fires. But don't look for the term fire water pump. And for sure don't use it. It's an "awkward"...

Calculate or calibrate? Calculate - apart from reference to tables for the pump, impossible. Calibrate - get a stop-watch and a very big bucket, switch on and stand back. There should be a capacity...

Centrifugal pumps

Take your red or orange marker and draw red pointy waves on paper. Add some brown logs below the fire for effect.

You aren't supposed to smoke the fuel pump