Some notes on the cooling side of the discussion...
All hoses must be Non-Conductive. At the Forge shop we use Goodyear and/or Thermold (Goodyear is far superior) in sizes from 3/8" to 1 1/2" on the work coils and up to 6" in the piping system.

Hoses which jumper from Hot to Return bus work have the minimum hose length for voltage distapation as follows: 25 volts per inch (1000 volt output systems = 40" min. hoses, and to be safe 30' hosing on the 4160 vac Input Xfrm'S)

Maximum of 50% **Tech** Glycol mixture in the AIH P/S's and 30% in the Ajax

All of our power supplys (American Induction Heating and Ajax) spec. a minimum of 30 lbs. differential.

As an aside, we run 5 forge production lines, 1) 1800KW 540 Hz. AIH,
1) 2000KW 540 Hz. Master/Slave AIH , 1) 1000KW 540 Hz. & 2) 4000KW
100/220 Hz. Ajax