Just some number on the JT9D Surmount.
600 Kg in 2.5 minutes calculates to a waterflow of 14.400 Kg/hr. This compares to a fuelflow in T/O of about 10.000 Kg/hr.
The waterinjectionsystem was powered by four waterpumps each requiring 48 KVA. They each require their own generator with just a little spare for the electronics. Galleypower was/is automatically switched off.
The best fun I had was when on one engine the watersystem just kept running after switchoff and on another the system switched offbut the fuelcontrol just kept on giving the extra mount of fuel.
Sq