PreOrdered thePowerCool W300!

[angular]

Oh really? It's a common GE/Marathon motor you can get from any number of places. For a heavy item like that paying sales tax is cheaper than shipping, so Grainger makes sense and the location is convenient for me.

Anyway... the whole contraption does actually work, so at least now I don't have to worry about damaging the torch if I crank up the amps.

[Rivets]

Angular,

What are the approximate dimensions of your heat exchanger ?
Would you know the heat removal capacity (BTU's/hr) ?
Also the water temp Delta T at a given welding current ?
And the pump GPM ?

Sorry for all the questions.

Thanks,
Rivets

[angular]

I can't find any BTU data on it, but this is the heat exchanger I'm using:

http://www.summitracing.com/parts/DER-13300/

Unfortunately I don't have any temperature sensors rigged up and I'm not sure of a practical way to measure & quantify thermal performance. I'll see if I can do some kind of basic test like measuring the temp of the water when "cold", then running 200 amps through the torch for a minute and seeing what the delta is.

The Procon pump part # is 111A100F11AA and it's rated at 100 GPH (@ 100 PSI) so that would be 1.67 GPM.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=230582068842

The internal bypass valve on the pump doesn't seem to go low enough (without completely unthreading), so I'm using an adjustable relief valve to bleed off excess pressure.

http://www.mcmaster.com/#8088k14

That relief valve is actually pretty nice for the money and easy to adjust by hand, so I'm glad I got it. Excess flow from the pump gets routed through the heat exchanger, so would I imagine around 1.5 gallons per minute are flowing through it at all times.

Hope that helps.

Bradley

[Rivets]

Bradley,

Thanks for your time. Much appreciated.

Cheers,
Andy

[performance]

Grainger usually charges up to 100% plus of full retail. I can usually buy almost anything cheaper anywhere else. Maybe in your area they are a good deal, but nothing I have seen in my area or in the catalog for that matter screams bargain, or even decent price.