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Air Filter Dessicant

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Okanogan Lew

Joined: 22 Jul 2010
Posts: 45

Posted: Fri Jun 27, 2014 6:29 am Post subject: Air Filter Dessicant

Guys, I used an after market dessicant in Doug's in line air filter for the CJ6.  The stuff turned to a solid & totally plug the filter.  So, a word to the wise to use only Doug's recommended dessicant.

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k7wx

Joined: 24 May 2010
Posts: 117

Posted: Fri Jun 27, 2014 7:53 am Post subject: Air Filter Dessicant

Here in the desert southwest, things are probably less humid than other locations, but I have used this in the air-water separator for my CJ for years with no problems.



  http://www.aircraftspruce.com/catalog/eppages/silica-gel.php?clickkey=24657



I typically change it every six months. 



Warren Hill

N464TW

Mesa, AZ



On Jun 27, 2014, at 7:29 AM, Okanogan Lew <vplewis(at)community.org> wrote:



 	  Quote: 	
		   

 

 Guys, I used an after market dessicant in Doug's in line air filter for the CJ6.  The stuff turned to a solid & totally plug the filter.  So, a word to the wise to use only Doug's recommended dessicant.

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=425584#425584

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wlannon(at)shaw.ca
Guest

Posted: Fri Jun 27, 2014 9:12 am Post subject: Air Filter Dessicant

One would think that the MIL Spec dessicant from AC Spruce should be OK. 

However in the deyhdrator plug application (stored, non operating engine) it 

would not be subject to any significant oil contamination.

Is oil contamination a factor??   I expect that most of the compressors on 

our engines are worn enough to emit a fair amount of oil.

Paul, is this the product you were using?



Walt



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dougsappllc(at)gmail.com
Guest

Posted: Fri Jun 27, 2014 9:54 am Post subject: Air Filter Dessicant

Also of some interest is the fact that when I ordered the blue desiccant from the factory I was informed that the EPA has ordained that the blue stuff is not good for us anymore so they could not sell it to me.  I guess Spruce never got the message (or has a bunch of old stock).  Anyway, the current opinion by those who look out for us is that the orange (turns to grey/green) is safe for us to use, guess the blue stuff killed their rats.  Just kinda makes you feel warm and fuzzy all over knowing that these folks are looking out for us. 



I saw Paul's filter and it could not have been more "caked up" if you had poured it full of Plaster of Paris.  The stuff was white and harder than a rock.

Best,

 Doug



On Fri, Jun 27, 2014 at 10:11 AM, Walter Lannon <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:

 [quote]--> Yak-List message posted by: "Walter Lannon" <wlannon(at)shaw.ca (wlannon(at)shaw.ca)>

  

 One would think that the MIL Spec dessicant from AC Spruce should be OK. However in the deyhdrator plug application (stored, non operating engine) it would not be subject to any significant oil contamination.

 Is oil contamination a factor??   I expect that most of the compressors on our engines are worn enough to emit a fair amount of oil.

 Paul, is this the product you were using?

 

 Walt

 

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okanoganlew(at)gmail.com
Guest

Posted: Fri Jun 27, 2014 3:32 pm Post subject: Air Filter Dessicant

Walt, I use Castor oil as a lubricant per Doug's recommendation.  Never had a problem before with the correct dessicant

On Fri, Jun 27, 2014 at 7:29 AM, Okanogan Lew <vplewis(at)community.org (vplewis(at)community.org)> wrote:

 [quote]--> Yak-List message posted by: "Okanogan Lew" <vplewis(at)community.org (vplewis(at)community.org)>

  

 Guys, I used an after market dessicant in Doug's in line air filter for the CJ6.  The stuff turned to a solid & totally plug the filter.  So, a word to the wise to use only Doug's recommended dessicant.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=425584#425584

 

 

 

 

 

 

 

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wlannon(at)shaw.ca
Guest

Posted: Fri Jun 27, 2014 7:46 pm Post subject: Air Filter Dessicant

Hi Paul;

  

 I was referring to the possibility of contamination with engine oil which  can happen with a high time compressor.   

   I contacted a desiccant company for advice.   They indicated that Activated Alumina rather than Silica Gel was the best choice  if oil vapors are present.  The specs suggest that it has a better  absorption rate than Silica Gel particularly with high subject air temperatures  as we would have.   However is not available as an indicating (color  change) desiccant.   Whether it can be dried and reused I have yet to  determine.

  

 Walt

  

  

  From: Paul Lewis (okanoganlew(at)gmail.com) 

 Sent: Friday, June 27, 2014 4:32 PM

 To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

 Subject: Re: Air Filter Dessicant

  



  Walt, I use Castor oil as a lubricant per Doug's  recommendation.  Never had a problem before with the correct  dessicant

 



 On Fri, Jun 27, 2014 at 7:29 AM, Okanogan Lew <vplewis(at)community.org (vplewis(at)community.org)> wrote:

  	  Quote: 	
		  -->    Yak-List message posted by: "Okanogan Lew" <vplewis(at)community.org (vplewis(at)community.org)>



Guys,    I used an after market dessicant in Doug's in line air filter for the    CJ6.  The stuff turned to a solid & totally plug the filter.     So, a word to the wise to use only Doug's recommended    dessicant.





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=425584#425584



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Rob Rowe

Joined: 10 Jan 2006
Posts: 124
Location: Berkshire, UK

Posted: Sat Jun 28, 2014 3:05 pm Post subject: Re: Air Filter Dessicant

The blue desiccant colour tracer is Cobalt Chloride which is a common allergen apparently and should be handled carefully, hence why it's being phased out to be replaced with various orange tracers. The Orange Green one is Methyl Violet I believe, which is considered safer.



Moreover Cobalt Chloride is a metal pitting agent (like all chlorides) that no doubt contributes to the aluminium alloy desiccant filter housing internal corrosion. So aside from toxicity moving away from Cobalt Chloride should help extend the life of your filter, either that or acquire one of Doug's stainless steel versions!



Rob R



 	  dougsappllc(at)gmail.com wrote: 	
		  Also of some interest is the fact that when I ordered the blue desiccant from the factory I was informed that the EPA has ordained that the blue stuff is not good for us anymore so they could not sell it to me.  I guess Spruce never got the message (or has a bunch of old stock).  Anyway, the current opinion by those who look out for us is that the orange (turns to grey/green) is safe for us to use, guess the blue stuff killed their rats.  Just kinda makes you feel warm and fuzzy all over knowing that these folks are looking out for us. 

 --

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dougsappllc(at)gmail.com
Guest

Posted: Mon Jun 30, 2014 10:26 am Post subject: Air Filter Dessicant

Rob,Thanks for that, I was not aware of the down side of the blue  Cobalt Chloride desiccant.  Good post.

Best,

Doug Sapp

On Sat, Jun 28, 2014 at 4:05 PM, Rob Rowe <yak-list(at)robrowe.plus.com (yak-list(at)robrowe.plus.com)> wrote:

 [quote]--> Yak-List message posted by: "Rob Rowe" <yak-list(at)robrowe.plus.com (yak-list(at)robrowe.plus.com)>

 The blue desiccant colour tracer is Cobalt Chloride which is a common allergen apparently and should be handled carefully, hence why it's being phased out to be replaced with various orange tracers. The Orange Green one is Methyl Violet I believe, which is considered safer.

 Moreover Cobalt Chloride is a metal pitting agent (like all chlorides) that no doubt contributes to the aluminium alloy desiccant filter housing internal corrosion. So aside from toxicity moving away from Cobalt Chloride should help extend the life of your filter, either that or acquire one of Doug's stainless steel versions!

 Rob R

 dougsappllc(at)gmail.com wrote:

 > Also of some interest is the fact that when I ordered the blue desiccant from the factory I was informed that the EPA has ordained that the blue stuff is not good for us anymore so they could not sell it to me.  I guess Spruce never got the message (or has a bunch of old stock).  Anyway, the current opinion by those who look out for us is that the orange (turns to grey/green) is safe for us to use, guess the blue stuff killed their rats.  Just kinda makes you feel warm and fuzzy all over knowing that these folks are looking out for us.

  >  --

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