Hand pumping question ?

[Trucker3573]

Those that hand pump do you run an extra slightly larger canister filter or just the small cigarette one that comes with them. I run an extra canister filter but it takes around 25 pumps to fill it before the gun even takes air. I really am kind of questioning if it does much? I tend to think neither filter really does. What are your thoughts?

 

[rcs9250]

That’s about right. You need to pressurize everything between the pump and the gun. The bigger the filter, the more pumps it will take. Air will not enter gun until you exceed the guns bottle pressure.

 

[Trucker3573]

Right I’m just kind of curious if that canister filter really does anything beyond making extra work? Lol. I tend to believe it doesn’t filter or dry anything.

 

[rcs9250]

If it’s the cigarette style filter it will absorb liquified water, but there can still be moisture laiden air like humidity on a hot day, that moisture laiden air will pass through to your guns tank. If your filter is actually a “drier” with a dessicant like a molecular sieve, it will remove that fine moisture.

 

[Joedirt199]

I use a larger one right at the pump on the air out side. I fill it with dessicant and it has a cigarrette filter on the out side before connecting to the whip which also has a small cigarrette filter at the very end. The pressurized air does better at forcing the moisture into the dessicant and the cigarrette filter in that container deffinately has oil and grime on one side so it keeps it out of the fill line and out of my guns. Strong believer in an extra filter. It is about the size of a prescription bottle so not the larger size that comes with a compressor. It only takes a couple pumps to see the pressure going up so it fills rather quickly.

 

[rcs9250]

Couple things. It’s very important that liquid water not get onto the dessicant beads, they get very hot and caustic, which can corrode your filter/drier container. It should also be vertical with the air entering the bottom, going through the cigarette filter first and then the mollecular sieve beads. Note: the beads need to be confined. They should not be loose inside the filter where they are free to fly around. If they’re loose, “channeling” could occur and air not get dehumidified as it should. And... be sure to drain any liquid water after each pumping session. I don’t know how long that volume of beads are good for. In the scuba bussines our driers were rated for a certain number of cubic feet of air or six months. Store any replacement beads in a very air tight container. Hope this helps. Your gun will appreciate it.

 

[dizzums]

i just run an intake cannister that has the beads in it, nothing on the pressure side, and i always handpumped indoors in the ac .. did it for several years on my mrod and when i finally opened up the gun to make some mods it had zero moisture or corrosion inside and looked brand new ... the pump itself is another story, the pump is a heatsink and actually condenses moisture 'inside' itself, so that needs to be removed or the pump WILL corrode inside ... so learn how to break it down and lube it if you want it to last ..

 

[Trucker3573]

Interesting as I strongly feel desiccant on the intake side literally does nothing. The others using desiccant I really hope you are using an insert and not allowing the desiccant to contact the metal. I guess I will just concentrate on more routine maintenance inside the gun to keep it corrosion free. I really suspect the larger desiccant filled compressor filters are the ones that actually work and I can’t imagine pumping those full each time.

 

[rcs9250]

The others using desiccant I really hope you are using an insert and not allowing the desiccant to contact the metal. I guess I will just concentrate on more routine maintenance inside the gun to keep it corrosion free.

I neglected to mention that in post #6. Thanks for mentioning it, it’s fairly important.

 

[badger5th]

IMO the cigarette filter at the pump outlet should be adequate. A good practice is to have the rifle above the pump discharge so water can flow by gravity back to the pump. Check the filter frequently and replace if damp. FWIW whenever I bleed my hand pump (Benjamin standard pump) I have never felt any moisture. Just my experience. Regards

 

[Healthservices]

I think it depends on how dry the air is to begin with. I would have a small filter just before the gun (after everything else) open and allow to air dry between each use, that way you can see how much moisture is caught with your setup. With my setup was dry after a high pressure water separator but always wet without.

Allen

 

[beerthief]

IF your really concerned you can always double up the small filters AS one at the pump and one b4 the gun it is what i did . never had moisture at the gun .
open air dry both filters every few times use .