SCUBA tanks for PCP rifle

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Interesting. I've never had a problem getting 80 cu. ft. tanks filled without a dive card, even as far back as 20 years ago. Usually I'd bring a hose and some fittings with me to help explain things, but never had to show them. A simple explanation of how I was going to use the air would suffice--in New York State no less, where everything is a regulatory hassle.

FWIW, I do know some guys who have stenciled, "NOT FOR BREATHING" on their PCP tanks, but I don't know if it helped.

I'm sort of out of the loop on getting tanks filled these days, as I own a compressor. Nonetheless I've taken an interest in buying a high pressure carbon fiber tank for range use. God bless those paintball guys!
 
syntaxerrorsix; less fills? Or was that a typo? Generally pcp folks only buy the 4500psi tanks b/c a full 3kpsi scuba tank on a 3kpsi gun obviously can't bring the gun to 3k even once. If you spring for the 3440 tank then you get a few fills but still nothing compared to a 4500 tank.
Optionally people can get an elect pump. I just bought the Shoebox F10 which easily pumps past 4500. It's slower filling a gun that using a tank, a few min vs a few seconds, but you never have to deal with driving to the fill place, waiting, hydro etc. Hardcore peep buy a 4500 tank and the pump so they can fill it themselves. I have a nice 74CF carbon fiber tank but it's been expired for ~5yrs now. Tempting to fill myself, and prolly fine, but that's just too much pressure to risk it.
Another sweet deal w/ the carbon fiber or glass tanks is the weight. Mine only weighs 12lbs. A 3440 steel tank is a beast to take anywhere, especially since you get so few shots from it.
A friend uses two 3k alum scuba tanks so he and a friend(s) can drive out in the sticks to shoot. He over fills them to get three fills from one tank, then to squeeze out an extra couple fills between them he'd use one tank until it can only partially fill the gun, then the other tank only to top off the remainder. So the shooting day is always very short due to air, and a extra pita to do all that. A single carbon fiber would've gave him ~50 fills, much less hassle and no risk.
Fyi here's a fill calc if anyone wants to get an est of how many fills whatever tank will fill whatever gun: https://sye.dk/airgun/index.php


Not a typo. Most of the SCBA hold 45cuft of gas where your average Aluminum 80 gives you 77cuft. Hence more volume. That means you'll get more fills from an 80 than a 45. The downside is less PSI.
 
A 45cf tank @ 4500 will fill a gun many times more than an 80cf at 3k. This is assuming a std pcp taking 3k fills. The 80cf is actually good for zero full fills of such a gun. If we're talking about a 2kpsi gun then the 80cf @3k is a player but the 45cf @ 4500 may still win. You can use this link to figure it out if you like: https://sye.dk/airgun/index.php
 
A 45cf tank @ 4500 will fill a gun many times more than an 80cf at 3k. This is assuming a std pcp taking 3k fills. The 80cf is actually good for zero full fills of such a gun. If we're talking about a 2kpsi gun then the 80cf @3k is a player but the 45cf @ 4500 may still win. You can use this link to figure it out if you like: https://sye.dk/airgun/index.php

We are talking about volume over PSI. 80cf is greater than 45cf.
 
Syntax; yes 80cf @3k is greater volume than a 45cf @4500 if vented to a lower pressure. So for breathing, or even diving, the 80cf would last longer, but quite the opposite when filling a typical 3k pcp gun.
You did say "fills" in your orig post, which I assumed meant pcp, not lungs...
So again; a typical 80CF 3kpsi tank cannot fill a typical 3kpsi pcp even once. A much smaller 4500psi tank will fill the gun many times.
Even the little bitty 90 cubic inch 4500 tank can fill a gun >5 times. A full size 80CF at 4500 will fill it >50 times.
 
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