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  1. #46
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    Jun 2005
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    The bigger the pipe the better for one very good and often overlooked reason. The faster the air moves through the pipes the more the water vapour stays in suspension and gets carried along. If a big pipe is used the air slows down and the water vapour drops out of suspension. It is not the pipe cooling the air it is the air slowing down to allow the water to drop out. Of course the pipe has an effect in cooling at the same time. Another cheap cooler is an old fridge, run a coil of pipe through it or put a small portable air tank in there and you have refrigerated cooling.

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  3. #47
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    Sep 2008
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    Perth
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    My compressor is three phase but looking at (new) three phase fans they aren't cheap. To fit the size cooler I'm thinking about I would need a ~350mm fan. Found a couple for ~$300. I could fit a small air tank, the sort they sell on ebay to go on 4wds for not much weight and just as a water trap. So I'd go compressor -> cooler -> small tank (w/ drain) -> big tank. The whole thing's already a heavy beast but I could position this setup over the axle so it doesn't affect lifting the handle up the other end too much.

  4. #48
    Join Date
    Jul 2006
    Location
    Adelaide
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    2,660

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    Quote Originally Posted by Legion View Post
    My compressor is three phase but looking at (new) three phase fans they aren't cheap. To fit the size cooler I'm thinking about I would need a ~350mm fan. Found a couple for ~$300. I could fit a small air tank, the sort they sell on ebay to go on 4wds for not much weight and just as a water trap. So I'd go compressor -> cooler -> small tank (w/ drain) -> big tank. The whole thing's already a heavy beast but I could position this setup over the axle so it doesn't affect lifting the handle up the other end too much.
    If you have a neutral available you dont need to use a 3phase fan..it can be single ph
    the N can be at the main isolating switch adjacent the compressor if the unit itself doesnt use a neutral. That only means rewiring from switch to compressor with a neutral.

  5. #49
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    Sep 2008
    Location
    Perth
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    363

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    While thinking about aftercooler setups, does everything have to be vertically downward flowing? My compressor has metal pipe with fins from the three piston heads down to the tank and they do flow vertically downhill. If I introduce an aftercooler after the heads, does the entry need to be lower than the lowest head and then the outlet lower than the entry and then a small tank/water trap lower down and then down to the main tank?

    The reason I ask is it would be easiest of all to go upwards to from the compressor heads and then everything can flow downwards from there, but if there's a risk of water condensing and flowing back down to the pistons then that's obviously a very bad idea. Or does the air flow combined with maybe a check valve for when it cycles off take care of that?

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