flow rate for a water cooler

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I've recently ditched my air cooled torch (thank god) for a WP-20.  The garden pond pump I have puts out 245 gallons an hour. Just looking at the flow of my return water I don't think I'm that high. I'm not sure how much more water you can really push through those small lines either.  My question is once I had the setup all hooked up and was doing some stringers at full amperage (200 amps) my power cable was getting pretty warm pretty quickly. The temp of my water in the resivor was still cold though. I am running my cooling water 'backwards' through the power cable first as that was much more simple to hook up in my home grown setup. I wouldn't think that would make a huge difference but now I am second guessing myself.
Reply:i use a pond pump [little gianthave used them for 19 yrs first one lasted 15yridealarc 250/250 ac-dc tigidealarc 250/250 ac-dc tig #2 used for sticklincoln sp100hh125dual arbor grinder polisher30 yrs of hand tools52 pitch blocks 6p-26prake gauge -pitch gaugeG&D prop repair 918-207-6938Hulbert,okla 74441
Reply:You need more head pressure than that pump can deliver---say 50# or so. Check by measuring the return flow rate.Verify that you don't have air locks, or incomplete filling of the water circuit.I believe the recommended hookup method is cooler--to torch--then back thruthe power cable.Blackbird
Reply:If you look at the spec for the Wp20 it gives the suggested flow rate.1.1 Quart a minute or 1 liter/minCon Fuse!Miller Dynasty 350Millermatic 350P-Spoolmatic 30AMiller Multimatic 200Hypertherm PowerMax 1000G3Miller Maxstar 200DX
Reply:245 gph is probably the highest flow rate, at zero pounds outlet pressure . as the presuure rises the gph drops. the mfr should have a curve for the pump to see if it will make 1 gph at 50 psi(veryfy from the torch mfr what the required pressure is..50 sounds high ..)