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Old 12-20-2007, 07:29 AM
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Air filtration questions

OK, I'm finally getting around to running air lines in the shop and would like to include some air filtration/water separator system. I noticed in the
"Eastwood" catalog that they have 2 and 4 stage systems, What is the difference? The systems that they list are a "Coalescing" system or a "Desiccant" system. Any thoughts on the plus or minus of either? I'm not sure I even know how a Coalescing system works, or if it is necessary. Any and all comment welcome!
Thanks

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Old 12-21-2007, 04:26 AM
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I have quite a bit of air line related ''stuff'' on my website.

Putting in a good set of airlines that will get rid of the water takes some planning, anyway, for what its worth, on my website you will find some information.

Rob

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Old 12-26-2007, 03:24 PM
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Quote:
Originally Posted by 69 work in progress
OK, I'm finally getting around to running air lines in the shop and would like to include some air filtration/water separator system. I noticed in the
"Eastwood" catalog that they have 2 and 4 stage systems, What is the difference? The systems that they list are a "Coalescing" system or a "Desiccant" system. Any thoughts on the plus or minus of either? I'm not sure I even know how a Coalescing system works, or if it is necessary. Any and all comment welcome!
Thanks
I'm going to try and answer this question, so if I need corrected on it, please do so.

Coalescing filter In a sharpe inline filter like an f-88, they have a like a stone type filter in them, that can be taken out and replaced when it gets discolored. I believe this is called a coalescing filter, in other words it takes out the oil and water. There is a little baffle next to the stone, probably the baffle has something to do with removing or capturing the water, and maybe the stone catches the oil.

Dessicant filter Dessicant can come in a sealed package or a pack or loose in a jar or can. It absorbs moisture, we used dessicant in our meters at a nuclear power plant, when it turned a different color, you changed it out.

You can also put it in a oven and dry it out and reuse it.

So as far as dessicant in a inline filter in an airline, guessing here, but maybe you can unscrew the cannister and refill it with dessicant. The dessicant I'm used to seeing is about the size of this O, and kind of looks like rock salt.

I really don't believe a dessicant filter or air dryer is needed in a hobby shop.

I'm not saying you shouldn't use it, but if your air lines are run right, you probably don't need it.

Now, if I'm off on this explanation, or if I'm right, would somebody please comment on this, one way or the other.

Thanks Rob

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Old 12-26-2007, 06:39 PM
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filter

I am not claiming to be an expert on this subject but with a little research and an excellant source I used the coalescing and a drip leg with a petcock near the filter (before) and used at least 30 ft of pvc pipe. Sched 40 pvc is not recommended by the claimed experts but I and many others have used it with no problems. Be sure not to let your shop/air system get below freezing as this will cause the pvc to become extremely brittle and the result is not good with compressed air. Also any horizontal piping needs to either drain back to your compressor or the drip leg and crack them open before each use. I haven't had any issues with this system but one advantage I have is forced air gas furnace in the shop and well insulated which controls humidity in the shop and the system to a lesser extent.
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