A very small 2 c worth. I'm all for cryogenic dryers; they are more 
reliable than the combination of a mechanical filter and a silica gel 
(or other hygroscopic material) filter. Look at the cycle: conventional 
adiabatic compression produces dirty, oily, air, at, say 70 degC a 
Rootes type compressor likewise, but somewhat less oily. This air can 
have a RH of up to 100%, ready to rust your iron pipes as it cools down 
and condenses. If you deliberately cool it down to, say, 0 degC, it will 
stay at 100% but the vapour pressure will drop from 31.2 kPa to 0.6 kPa, 
a 50x reduction. As it warms up again in the pipework, the RH will drop 
accordingly. In other words, the absolute humidity will become very 
small indeed. If necessary, it may be complemented by an absorption 
filter, which will last for ages. I believe there are also sub-zero 
cryogenic filters, with automatic de-icing.

Brian

On 08/02/2013 00:14, Douglas Pauls wrote:
> Interesting Lloyd.  Why a refrigerated dryer?  What does it give you that
> ordinary in line dryers to not?
>
> Doug Pauls
>
>
>
> From:   Lloyd Duso <[log in to unmask]>
> To:     "'TechNet E-Mail Forum'" <[log in to unmask]>,
> <[log in to unmask]>
> Date:   02/07/2013 04:10 PM
> Subject:        RE: [TN] Spray Guns - Round 2
>
>
>
> 1. Here at Diamond, all we do is conformal coating and on the liquid side
> about 95% of it is hand sprayed. My sprayers prefer the 20oz cups and that
> seems to work fine for them with no complaints. The smaller cups give them
> a
> chance to shake it out during refills. Obviously we keep a separate gun
> ready for the different coatings (SR, UR, ER) and they hang the guns on a
> rack in between batches or during fill-ups but nothing supports the guns
> during spraying.
>
> 2. We use shop air run through a refrigerated dryer then a
> separator/desiccant dryer at the booth with a regulator to step the
> pressure
> down. I know some who use nitrogen as well but that is only because they
> already have a need for it for other operations.
>
> Lloyd E Duso
> Plant Manager
> Diamond-MT
> (814) 535-3505
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
> Sent: Thursday, February 07, 2013 4:33 PM
> To: [log in to unmask]
> Subject: [TN] Spray Guns - Round 2
>
> Thank you all for your suggestions, I will be looking at several of them.
>
> Some follow up questions:
>
> 1.  If you are using the gravity fed guns, with the large reserviors on
> top
> - do you use some form of tool rest to take up the weight?  If so, what
> kind?  If not, do your operators complain about the weight and what it
> does
> to their wrist (repetitive motion issues).
>
> 2.  If you are using HVLP guns, are you using stepped down compressed shop
> air (with drying and oil trap) or are you using a separate turbine system
> to
> supply the air?
>
> I use a turbine based HVLP gun in my woodworking and it screams like a
> banshee, so I would be concerned about the noise.
>
> Doug Pauls
>
>
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