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Dessicant Air Dryers

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Ironken
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Dessicant Air Dryers

Postby Ironken » Sun Jun 17, 2018 5:18 am

I read one of Jim Colt's posts regarding Dessicant dryers.....I am having a big issue with moist air and purchased this set up https://www.miltonindustries.com/1-2-ju ... dryer.html . Jim said (loosely quoted) that small fragments of the dessicant can make their way into the plasma system and cause grief. Has anybody experienced issue with dessicant dryers or have any ideas on how to ensure that the dessicant does not make its way into my Powermax 45xp?

robertspark
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Re: Dessicant Air Dryers

Postby robertspark » Sun Jun 17, 2018 6:57 am

I don't use a dessicant dryer so have no experience to convey.

But a secondary filter will collect anything carried out of the dryer.

The thing to watch is pressure drop overall on the system. (Hence you need to make sure you have enough residual pressure after all your filtration items)

I use quite large filters with replaceable filter elements in a three stage arrangement down to i think 0.01 micron (but with a membrane dryer arrangement)

robertspark
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Re: Dessicant Air Dryers

Postby robertspark » Sun Jun 17, 2018 7:03 am

Interesting the blue dessicant is band in the European union because it think the additive is cobalt (although that does not stop you buying it on eBay or China...

The only reason I'm telling you if if you sandblast or spray paint with your system and use some of the air for an air fed mask it's bad news if the air could contain cobalt as it's carsnogenic and i don't think a carbon filter will remove it....

http://www.cobaltchloride.net

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acourtjester
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Re: Dessicant Air Dryers

Postby acourtjester » Sun Jun 17, 2018 9:50 am

Here is what I have been using for years and another was installed on a table I built and sold too. I know other here will poop poop it but I have had no problems with it of the desiccant I use. This is a water filter from Lowe's I modified I mounted it on the cart under my Hypertherm 65's .
https://www.lowes.com/pd/Whirlpool-Sing ... m/50412472
the desiccant is from Walmart in 4 pound bags and it looks like there are other brands of silica gel litter too.
kitty.jpg

air dryer (6).JPG

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Brand X
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Re: Dessicant Air Dryers

Postby Brand X » Sun Jun 17, 2018 11:05 am

I have used a Van-air system for about 20 years. Bought a box of Deliquescent Desiccant they had in stock at the time.Came from the local wood mill. Think I paid about $25.00 for the box. Half gone now.. Last a super long time, Just drain the liquid out the bottom, and add more every year or two. (point of use) I filter the air after my tower with a La-man filter like comes on Thermal Dynamic machines.. zero moving parts, and will flow plenty of air for 120 amp consumables.. Good enough for me.. Pretty much lifetime system,now that I have extra stuff for my La-mans filter.. Never had to service it, because the tower does all the work..Also Never had a air code from a Thermal dynamics/Esab, or Hypertherm plasma cutter..(Unless i forget to turn the compressor on) I run 110 min pressure to take care of any psi drop from the 25ft copper cooling air line.. simple is really good..

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Re: Dessicant Air Dryers

Postby plasmanewbie » Sun Jun 17, 2018 3:18 pm

I Use the Sharpe 3 stage filter dryer from this site http://www.plasmaspider.com/shop/dryer_sharpe6760.html It has a sintered bronze filter in the desiccant stage which eliminates the chance of desiccant fragments from entering your air stream. Works like a charm and my nozzles and electrodes burn nice and clean with no sign of moisture or crap burning in the nozzle. Major improvment in cut quality and consumable life.

djreiswig
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Re: Dessicant Air Dryers

Postby djreiswig » Sun Jun 17, 2018 3:24 pm

acourtjester--According to the manual for that filter, the max operating pressure is 100psi. Also, I'm not sure if you are aware, but some plastics are affected by oil from the compressed air as well as UV light. Over time it causes the plastic to degrade and at some point that filter housing may explode and send shards everywhere. It is a well known fact that plastic piping should not be used for compressed air piping. Not saying you will ever have any problems, but why take the chance?
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Re: Dessicant Air Dryers

Postby acourtjester » Sun Jun 17, 2018 6:24 pm

thanks I know that and understand but its my way
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Ironken
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Re: Dessicant Air Dryers

Postby Ironken » Tue Jun 19, 2018 10:25 pm

Gentlemen, thank you for all of your replies and experience. I think that after my desiccant dryer, I will run a particulate filter as was suggested above. Now the big question......Hypertherm states that some synthetic compressor oils can damage the on board dryer bowl. Anybody have any failures from using synthetics in their compressors? I have been using Amsoil up until now.

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Re: Dessicant Air Dryers

Postby djreiswig » Tue Jun 19, 2018 10:33 pm

We use synthetic oil in our GD compressor at work and have never had any problems with air filter bowls.
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robertspark
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Re: Dessicant Air Dryers

Postby robertspark » Wed Jun 20, 2018 7:52 am

Guess you could install a deflector (simple metal plate) in front of the bowl or plastic filters if you go acourtjesters route... If something shatters the flying debris is contained

Explains why I've seen shrouds on these and never considered before
https://dccf75d8gej24.cloudfront.net/im ... -large.jpg

djreiswig
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Re: Dessicant Air Dryers

Postby djreiswig » Wed Jun 20, 2018 10:16 am

I always thought those were to protect them from getting hit, but I guess it would sort of contain an explosion.
2014 Bulltear (StarLab) 4x8
C&CNC EtherCut
Mach3, SheetCam, Draftsight
Hypertherm PM65
Oxy/Acetylene Flame Torch
Pneumatic Plate Marker, Ohmic, 10 inch Rotary Chuck (in progress)

Ironken
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Re: Dessicant Air Dryers

Postby Ironken » Tue Jun 26, 2018 5:00 pm

djreiswig wrote:We use synthetic oil in our GD compressor at work and have never had any problems with air filter bowls.


If you have had no problems, then good enough for me! Thank you.


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