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PostPosted: Wed Mar 13, 2019 6:22 pm 
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Joined: Mon Jan 20, 2014 10:32 pm
Posts: 752
Location: Burlington ON
I know nothing about this but always wondered:
If the rifle has a fill pressure of say 2000 or 3000 psi and the cylinder is filled to say 3500 psi (at least that's what the air cylinders in the lab at work are), do you only get a few fills before the cylinder has to be taken back for a top-up?


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PostPosted: Wed Mar 13, 2019 7:11 pm 
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Joined: Sun Nov 06, 2011 2:16 pm
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Location: 1/2 Way From Ottawa and Montreal,
if you use 2 cylinders you can get more fill.
you fill with the one that has the least presure then top up with the other so in essence you use less air of your higher presure cylinder and you will get more fills out of it
I think it's called cascade.



but for your original question is Yes. and you will fill a 2000psi cylinder more times then a 3000psi one before you need to refull.

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PostPosted: Wed Mar 13, 2019 7:32 pm 
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Joined: Fri Dec 30, 2005 2:14 am
Posts: 1658
Location: Calgary, Alberta
At the top of the General Airgun Chat, there are links to calculators to determine how many fills a tank can give your pcp gun.
For example, my 97 cu ft 4500psi scba tank can fill a 180cc cylinder from 2000 to 3000 psi 73 times.

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PostPosted: Thu Mar 14, 2019 4:53 am 
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Joined: Mon Jun 06, 2016 11:31 am
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Are you going to the dark side Dorian?


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PostPosted: Thu Mar 14, 2019 5:50 am 
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Joined: Mon Mar 27, 2017 7:06 pm
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Location: Meaford, Ont.
Good Question. Kinda was behind my decision to get a QB Chief rated for 2000 pounds and a hand pump. Can shoot it and it gives me time to figure out the best route for me to go. I do own Nitrogen tanks for AC business. With a hand pump gun I shoot all my other guns still also. PCP changes the way I shoot pellets. Go through so many less pellets not only because of pumping but it is so accurate I find my shooting slowed way down with it. I don't just keep firing pellet after pellet as fast as I can. Only down fall is I can not shoot all my targets and traps with it because of the speed. Options are low for a PCP around 550 - 600FPS. CHEERS!


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PostPosted: Thu Mar 14, 2019 7:13 am 
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Joined: Mon Aug 08, 2016 7:23 am
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Location: Somewheres near the Atlantic
https://www.airgunsofarizona.com/Tanks/FillCalc.html

Fill this out, and will tell you how many times, your tube , will be filled by your tank.

Like an Example. If you got a 75 CF steel scuba tank, that you filled to 3300 PSI. And you want to fill a gun to 2K PSI, and the gun has a 215 CC air res. And you top it up once the air res gets to 1000 psi.

You'll get 55.7 top ups with that 75 cf air tank.

Now if you fill to say 3000 PSI and top it up at 1000, you'll only get 6.6 fill ups.


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PostPosted: Thu Mar 14, 2019 5:53 pm 
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Joined: Mon Jan 20, 2014 10:32 pm
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Location: Burlington ON
I assumed as much but good to get the confirmation, thanks all. I didn't know there were calculators for this sort of thing - also interesting to note.

MisterJ wrote:
Are you going to the dark side Dorian?

Not yet, Johnny.........but never say never...? (And if I ever do, I think I would budget for a compressor)


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