Author Topic: Pre-dryer  (Read 430 times)

Alan

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Pre-dryer
« on: August 13, 2018, 08:19:12 AM »
HAM published a pertinent article today (https://hardairmagazine.com/reviews/warning-distressing-content-pcp-airgun-corrosion-this-is-what-moisture-does-to-your-air-rifle/) about airgun moisture damage. I commented on that article, because at one time I used a high-pressure air dryer. The dryer had me sort of pressure regulator built into it, assuringly to improve the drying process. That was good perhaps, but it caused all sorts of issues with the pressure shut-off regulator in the compressor. This fact is one of the reasons I bought a real compressor—an Air Charger.

My comments solicited this comment from HAM: Alan,

Thanks for your continued support and your comments!

I’m not aware of any pre-dryers for electro-mechanical compressors, only pre-dryers for hand pumps. Do you know of any?

Thanks.

Best regards,
Stephen Archer
Publisher, Hard Air Magazine ®
www.hardairmagazine.com
Tel: 585-203-4812


And here is my reply:

Well, I made my own silica gel, pre-dryer.

The compressor is the basic Air Charger model. Like all Air Chargers, the intake air is routed through the crankcase via a fritted brass filter of sorts. It has standard 3/4 inch pipe threads, so routing the air was no problem.

Inside the plastic jar, you can see the piece of filter paper around the pipe. This makes sure none of the silica gel spheres get inside the piping. It must work, as I have to dry the silica gel after about an hour of operation. Or a bit sooner during the wetter months of the year. That takes about 3 minutes in the microwave.

Alan



I believe anyone can duplicate my effort. In fact, silica gel and all, it cost less than $15 to build.




  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

d_boom

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Re: Pre-dryer
« Reply #1 on: September 28, 2018, 05:51:30 PM »
I assume the compressor has a moisture removal system on the high pressure side?
Drying the air as it enters should reduce the amount of moisture removed on the high
pressure side.
  • Wichita, Kansas

Alan

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Re: Pre-dryer
« Reply #2 on: September 29, 2018, 04:04:21 AM »
You're correct on both issues.

If you remove the pre-drier, you get a LOT of moisture when you open the valve. I do shoot a lot, so I have to dry out the desiccant about once a week. Takes about 15 minutes in the microwave at 50% power.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

steveoh

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Re: Pre-dryer
« Reply #3 on: September 29, 2018, 07:02:12 AM »
I have been fretting about how dry the air is coming out of the Yong Heng. Think I’ll make up one of these too!
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caniborrowsomeammo

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Re: Pre-dryer
« Reply #4 on: September 29, 2018, 06:57:37 PM »
Turn your bottle upside down and crack the valve to see if you have any moisture in it.
Buncha BB guns that I don't get to shoot as much as I like. Building duck boats now that I'm "retired".