Drying air for spray gun

[Badger]

Thanks for the advice folks.

Hee hee!! All I wanted was to stop the moisture spoiling the finish.

By the way, talking of finishes. I've just been reading a book called "Understanding Wood Finishing - How to select and Apply the Right Finish." (American Woodworker/Readers Digest)

In my humble opinion a book on a par with the Neil's polisher's handbook. Not so much detail on how to do it but loads of background info on why do certain things and chose certain finishes. Debunks quite a few myths too

[soundman]

Its important to grasp where my asertions are comming from.
& the point is
extracting contaminants form cool air is vastly easier because they form droplets far more redily.

moisture traps work much better on cool air.


hope this helps someone.

It was a major revilation to me.

cheers

[Red neck]

Soundman,

Correct. The air reaches its ‘dew point’ or the temperature to which moist air must be cooled at constant pressure, to become saturated.

That was my thoughts on the coalescer. If the air in the line is cooled, condensation can be induced and the resulting water droplets filtered out. Coalescence enables the drops to be increased in size so that they may be captured and removed from the air stream. A type of mechanical filtration system to remove water droplets.

[Shane Watson]

Originally posted by soundman
the only way I could imagine to truly extract gas form contaminents would be chemical, ie passing the air thru some form of desicating crystals that then have to be rejuvinated or replaced.

Bing Bing Bing we have a winner....!

[Oldblock]

Interesting discussion going on here guys, keep it up, I'm learning lots.
My system (about $400 worth) gets used mainly for blowing dust etc, I have noticed the little transparent chamber never seems to have anything in it but occasionally vapour is visible when I squirt my blower. (perhaps I should see my doctor?)
I drain the tanks about ten times less frequently than the instructions recommend (about the same as my car) and get a cupful of rusty water.
I have been wondering whether all this stuff about draining etc really mattered or whether I had an el cheapo filter that didn't work.
The small amount of spraying oil based poly varnish I do has not revealed any moisture problems.
Or is this whole subject a question of what the local climate is like.

Ray