Question about fill times

[doffy]

Hello everyone
As I am new owner of PCP gun so of course I need to fill the gun with air
So I started topic last week and I have to say thanks for everyone helped me there
I decided to ignored the PCP hand pump since they may damage my gun in long term (even with adding moisture and oil filters) so after all I don't want to broke my PCP gun
So I decided to get scuba diving cylinder 300bar I am between two sizes (3L &7L)
My PCP gun is Diana BANDIT the tank of the gun is 50cc max 200bar
So my question is
Can anyone please tell how many fills Will get from 3L or 7L cylinder
Considering filling my gun from 100 bar to 200bar or (1450psi to 2900psi)
I am asking because I found this website for tank fill calculator

Airgun Tank Fill Calculator

As equation I found in other forum to convert the cu.ft to liter
(Multiply the litres you want by 4351 by 0.03666 then divide by 14.7)
So in my case let say I want 3 liter scuba tank
[3*4351*0.03666/14.7 ]= 32cu.ft

So the results is 61 fill times from 3 liter300bar scuba tank !! Is this right or there's something missing??

 

[beerthief]

might e a little less because you exhaust air disconnecting the hose .

 

[doffy]

might e a little less because you exhaust air disconnecting the hose .

Okay less by how much
I mean let's consider exhaust air every time fill from 61 to 50 times? Or 40 still very good for me I mean 40 fills Will give me 1200 round from 3 liter cylinder that will cost me $6 to fill this is very satisfying

 

[rcs9250]

If there is a way to calculate (estimate) the volume of your fill hose I would think you could add that to your guns tank size.
For example, if your fill hose volume is 3cc’s just add that to your guns tank size. Obviously your shot count does not increase but might give a better number of fills calculation.
One problem might be figuring out the ID of your fill hose. Maybe there’s specs available for your hose and just use pi x rad. squared x hose length.
If you can’t determine hose ID maybe fill with water and then empty it into a syringe or something with accurate graduations. Submerging and forcing water through it till no air bubbles may be easier than trying to fill it with a syringe because you wouldn’t know if there’s trapped air.

 

[beerthief]

Really at this many fill 's i would just smile and not be concerned .

 

[Stubbers]

Fill hoses are really negligible but certainly may contribute a couple cc's of wasted volume. My adapter between fill hose and tank is probably closer to 5-10 cc's. Any volume between your guns check valve and your tanks shut off valve should be considered.

-Matt

 

[doffy]

Fill hoses are really negligible but certainly may contribute a couple cc's of wasted volume. My adapter between fill hose and tank is probably closer to 5-10 cc's. Any volume between your guns check valve and your tanks shut off valve should be considered.

-Matt

Hello just found this topic 2021

This guy has 1.6 L tank fill from 2000-3000 psi 50 refills !!! So that make sense to 3 L tank fill from 1450 to 3000psi 60 refills what you think about that
Need information about this

 

[Stubbers]

Hello just found this topic 2021
View attachment 397518


This guy has 1.6 L tank fill from 2000-3000 psi 50 refills !!! So that make sense to 3 L tank fill from 1450 to 3000psi 60 refills what you think about that
Need information about this

He got 16 fills for his 150cc gun, which would translate/extrapolate to 48~ on his 50cc, as he said "something like 50" which sounds like he rounded.

Nonetheless, yes that seems about right, 50~ fills for a 50cc from 2000-3000 from a 1.6L filled to 4500.

Using AoA's fill calculator they say around 80 fills for a 45CF tank going from 1450 to 3000 with 4500 tank pressure. My personal calculator I built says closer to 72.

-Matt

 

[doffy]

He got 16 fills for his 150cc gun, which would translate/extrapolate to 48~ on his 50cc, as he said "something like 50" which sounds like he rounded.

Nonetheless, yes that seems about right, 50~ fills for a 50cc from 2000-3000 from a 1.6L filled to 4500.

Using AoA's fill calculator they say around 80 fills for a 45CF tank going from 1450 to 3000 with 4500 tank pressure. My personal calculator I built says closer to 72.

View attachment 397542


-Matt

Hello sir yes I saw this calculator earlier today surprised the inventor himself reply my topic that is pleasure
Yeah that's my inputs to your calculator
I like the idea of adding air loose during bleed the air (am I right?) I assumed the air loose during bleed %10 which is 5cc (0.005L) of tank capacity 50cc(0.05L) and fill my gun from 100bar ( before yellow line) to the end of green (200bar)
So this is my result for 3L scuba tank about 40 fills!!! That's very impressive