Putting a moisture filter on my Benjamin hand pump: Inline filter, or the Benjamin desiccant?

[Sodbuster]

So the title pretty much sums up the question. Which is the best at removing the moisture from the pumped air?

I'm using the Benjamin pump for a Marauder, and pumbing to about 2600 lbs. With the desiccant filter you can view the color change without opening the filter,
the Air Venturi inline filter you need to open it to inspect the filter material. Maybe it's a coin toss? Any advice?

 

[badger5th]

It depends. If you are just filling guns directly then the small inline "cigarette filter" type units are fine. Just get a bag of replacement elements for it. OTOH if you are filling tanks you should consider a heavy duty multi-stage filtration unit such as the Tuxing "gold" filter:

https://www.amazon.com/Diving-Seper...t=&hvlocphy=9001869&hvtargid=pla-745289532953

These Tuxing units seem to be popular with airgun/airsoft guys who fill larger SCBA tanks.

 

[WorriedMan]

Sodbuster,
Hard to remove moisture while hand pumping. Pre-pump desiccant filters are more gimmick, than effective and small cotton-filled post pump filters aren't much better. The larger, more effective post-pump filters take time to pressurize, and adding more effort to the hand pump program isn't a good thing. Hand pumped moisture into my first PCP using a "cigarette filter-style" cotton filter and a four-inch Amazon "tampon-style" cotton-filled metal filter. Upon upgrading my PCP collection, I went Yong Heng and never looked back. WM

 

[WorriedMan]

Sodbuster,
Thammer posted a thread on May 26, called, "Why Dry Air is So Important". Type "moisture" in the search block, then "Thammer" in member block to access. You are very wise to be concerned. Best of Luck, WM

 

[rcs9250]

The cigarette style post pump filters are just that, a filter. They will remove dirt and liquid moisture. It will not remove moisture similar to humidity. For that it must be chilled and or go through a molecular sieve.

 

[nervoustrig]

I have a 1qt canister filled with conventional silica desiccant on the intake of a couple of hand pumps and I do all my pumping indoors (avoid the outdoor humidity). Over the course of 10 years and dozens of PCPs, there has never been a drop of water found in any of them.

It's not supposed to work. But it does.

 

[Bernie7]

I have a 1qt canister filled with conventional silica desiccant on the intake of a couple of hand pumps and I do all my pumping indoors (avoid the outdoor humidity). Over the course of 10 years and dozens of PCPs, there has never been a drop of water found in any of them.

It's not supposed to work. But it does.

The exploded Leshiy thread prompted me to start reading back on the subject. You’ve given me some exceptional advice before so my question is how are you judging there’s no moisture because when the pressure decreases the moisture would go with it right? Would take the rapid depressurization cause liquid water to become gaseous as it escaped? Or you’ve never seen evidence of corrosion when assessing internals?

 

[nervoustrig]

The exploded Leshiy thread prompted me to start reading back on the subject. You’ve given me some exceptional advice before so my question is how are you judging there’s no moisture because when the pressure decreases the moisture would go with it right? Would take the rapid depressurization cause liquid water to become gaseous as it escaped? Or you’ve never seen evidence of corrosion when assessing internals?

Sorry, I missed this question from a couple of weeks ago. I was referring to the internals...I've never found rust in any of the guns I've hand pumped. Not even trace amounts of of condensation or droplets or anything of that nature. Many of them have steel air tubes.

A couple of times I've found a bit of rust in little crevices exposed to the atmosphere like the area between the two O-rings of a gauge block. The result of getting caught in a rainstorm and a little bit of water wicks in. But inside the pressurized areas, not even once. I know it can happen because I've found it in other people's guns but even those instances have been far and few between.