Anybody here know how many 480 cc / 250 bar bottle fills I get off a 12 cu-ft 4,500 psi tank?
12 cu-ft 4,500 psi tank question
- Thread starter marcella69
- Start date
Upvote 0
I do own a compressor (4,500 psi Omega Air Charger) and an Omega 75 cu-ft 4,500 psi tank. I got 13 refills on my 480 cc FX Impact bottle from my fully-charged 75 cu-ft tank. I figured that since 12 cu-ft was 1/6 capacity of 75 cu-ft, that I would get two 480 cc bottle refills with the 12 cu-ft-er. (I want to use it instead of a spare 480 cc bottle for my new RAW HMx .357 regulated rifle.) This jives with the refill calculator results on AOA in that when I plug 'n chug the numbers for the 75 cu-ft-er, I get 8.7 refills. I get a 1.4 refills result for the 12 cu-ft numbers. I know the 8.7 number is wrong empirically. But interpolating using proportional math, the numbers jive with 13 refills w/ the 75 cu-ft-er and two refills w/ the 12 cu-ft-er. I ordered a 12 cu-ft-er, so I'll find out when I get it.
I really am interested in someone who has actually filled a 480 cc bottle from a 12 cu-ft tank.
I really am interested in someone who has actually filled a 480 cc bottle from a 12 cu-ft tank.
Upvote 0
I have a 90 cubic inch tank air venturi and fill a 490 cc condor tank. If I let it shoot down to about 1900 psi I can refill the gun about 4 times. I know it is not the same but a reference. I guess what Im trying to say is it depends where you are starting your fill pressure from. Not from zero every time.
Upvote 0
Thank you for that; that is promising. I'm actually refilling from a higher pressure (150 bar).
Upvote 0
Yes, I have similar questions. I have a 90 cu inch Air Venturi bottle that I use to fill my Marauder's 215CC air tank. Usually shoot from 2800 PSI down to about 1800 give or take.
Just talked to the folks at PA (Chat is great).
I have the 90 CI tank, which apparently is 16.2 cubic feet according to the folks at PA.
Their link is http://www.calc.sikes.us/2/index.php
That says that in a perfect world, start at 4500 PSI in the tank, start the Marauder at 1800 PSI, fill to 2800 PSI would give me 12 fills. It's a 215 CC cylinder. If a 215 gets a dozen fills, the larger 430cc bottle might get 6 off the 90ci tank.
Does make the argument for a compressor or larger tank that much more credible.
Just talked to the folks at PA (Chat is great).
I have the 90 CI tank, which apparently is 16.2 cubic feet according to the folks at PA.
Their link is http://www.calc.sikes.us/2/index.php
That says that in a perfect world, start at 4500 PSI in the tank, start the Marauder at 1800 PSI, fill to 2800 PSI would give me 12 fills. It's a 215 CC cylinder. If a 215 gets a dozen fills, the larger 430cc bottle might get 6 off the 90ci tank.
Does make the argument for a compressor or larger tank that much more credible.
Upvote 0
This whole bottle fills per tank thing is driving me nuts. (And for me, that's a short trip!) The fill calculators (AOA and PA) are not jiving with my empirical evidence. I actually got 13 complete re-fills of the 480 cc bottle (250 bar) on my FX Impact from a fully-charged Omega 75 cu-ft, 4,500 psi tank. Yet, the calculators return only 8.8 fills. This would mean that the return of the calculators of 1.6 bottle refills off a 12 cu-ft tank (all other things being equal) actually gives 2.36 refills [(13 / 8.8) * 1.6]. This is consistent with the info in crittahitta's post above.
I am receiving my new Omega 12 cu-ft, 4,500 psi tank today. Unfortunately, I will not be receiving my new RAW HMx .357 (130 ft-lbf regulated) rifle for another six weeks :-(. (I had to sell my FX Impact, my only air gun, to buy the RAW.) It will be interesting to see exactly how many bottle re-fills I actually do get of the 12 cu-ft tank. Another weird thing: The Google cu-in to cu-ft converter says that 90 cu-in is equal to 0.05 cu-ft!
I am receiving my new Omega 12 cu-ft, 4,500 psi tank today. Unfortunately, I will not be receiving my new RAW HMx .357 (130 ft-lbf regulated) rifle for another six weeks :-(. (I had to sell my FX Impact, my only air gun, to buy the RAW.) It will be interesting to see exactly how many bottle re-fills I actually do get of the 12 cu-ft tank. Another weird thing: The Google cu-in to cu-ft converter says that 90 cu-in is equal to 0.05 cu-ft!
Upvote 0
Well, yes, it drives me nuts as well. Do remember though:
1. I've never seen a perfectly accurate guage in a compressor, bottle, or gun. The combination of errors may cancel out, or may make it horrible.
2. the calculators are probably written with very conservative formulas. Under promise and over deliver usually works better in business.
I suspect filling at sea level and refilling at 5000 feet would make a difference as well. It's all relative.
You are also correct on the 90 cu inch tank being .05 cubic feet. I'm wondering if the 16.2 cu ft is compressed air, 'cause it sure isn't tank volume. Does anyone know the intricacies of compressed air volume? maybe I'll ask my son, he's got an engineering degree.
1. I've never seen a perfectly accurate guage in a compressor, bottle, or gun. The combination of errors may cancel out, or may make it horrible.
2. the calculators are probably written with very conservative formulas. Under promise and over deliver usually works better in business.
I suspect filling at sea level and refilling at 5000 feet would make a difference as well. It's all relative.
You are also correct on the 90 cu inch tank being .05 cubic feet. I'm wondering if the 16.2 cu ft is compressed air, 'cause it sure isn't tank volume. Does anyone know the intricacies of compressed air volume? maybe I'll ask my son, he's got an engineering degree.
Upvote 0
Salt, you make a great point that had not occurred to me. I live right by the beach, which has an elevation of 20 ft! But, one would think that would not be material due to the thick tank walls. Oh well.
I got my Omega 12 cu-ft 4,500 psi mini-tank today! It says right on the side that 12 cu-ft equals 68 cu-in, which is consistent with 90 cu-in equaling 16.2 cu-ft. Maybe you're right and the compressed nature of the air (as a function of relative psi) accounts for the disparity between the calculator chart numbers and the Google converter; But, if that's the case, you'd think that would apply to both sides of the conversion equation!
At any rate, the proof is in the pudding. When I get my new RAW, I'll find out for sure exactly how many re-fills i get. I must say, the 12 cu-ft buddy bottle is a lot lighter and smaller than I thought it would be. I actually thought that a mistake had been made when i picked up the box. If this baby gives me at least two complete re-fills on my gun bottle, I'll be tickled pink; because this will be no problem carrying in my backpack.
As much as I rage against the machine about these technical issues, this is actually a big reason why I love airgunning so much. Not only do I thoroughly enjoy getting out in the field, I also enjoy the intellectual stimulation involved in all the technical aspects of air guns. It takes real skill to master the plethora of variables necessary to put pellet on pelt! (Much more than firearms, IMO.)
I got my Omega 12 cu-ft 4,500 psi mini-tank today! It says right on the side that 12 cu-ft equals 68 cu-in, which is consistent with 90 cu-in equaling 16.2 cu-ft. Maybe you're right and the compressed nature of the air (as a function of relative psi) accounts for the disparity between the calculator chart numbers and the Google converter; But, if that's the case, you'd think that would apply to both sides of the conversion equation!
At any rate, the proof is in the pudding. When I get my new RAW, I'll find out for sure exactly how many re-fills i get. I must say, the 12 cu-ft buddy bottle is a lot lighter and smaller than I thought it would be. I actually thought that a mistake had been made when i picked up the box. If this baby gives me at least two complete re-fills on my gun bottle, I'll be tickled pink; because this will be no problem carrying in my backpack.
As much as I rage against the machine about these technical issues, this is actually a big reason why I love airgunning so much. Not only do I thoroughly enjoy getting out in the field, I also enjoy the intellectual stimulation involved in all the technical aspects of air guns. It takes real skill to master the plethora of variables necessary to put pellet on pelt! (Much more than firearms, IMO.)
Upvote 0
I just filled my new Omega 12 cu-ft 4,500 psi mini-tank with my 75 cu-ft 4,500 psi tank (which I fill with my 4,500 psi Omega Air Charger). If my calculations (based on empirical evidence and my [limited] understanding of physics) are correct, I should get at least six fills of my 12 cu-ft-er off my 75 cu-ft tank. I might just sell my 75 cu-ft tank and fill my 12 cu-ft-er directly from my compressor. (It should take about only six minutes!) I'm gonna wait until I get my new RAW to see how the whole situation is gonna actually work out though.
Upvote 0
I wouldn't sell the tank unless money is a big issue. Im like you. I have a condor ss, a 90 ci A/V bottle and a A/V compressor and the combo works awesome. Until I was asked to go shooting at someone else place and a bigger tank would have lasted the day. I was unable to use my compressor and my small bottle ran out quickly giving me only 4-5 fills. I would like to get a bigger tank for trips where a compressor can't go. JMO. Also marcella69 it does take about 6-7 minutes to fill the bottle from 2900 to 4500. I love this thing.
Upvote 0
Yeah, crittahitta (I love that handle!); I'm going to keep my 75 cu-fter. I am going to fill my 12 cu-fter with my compressor from now on though because I can't get it to 4,500 psi with my 75 cu-fter. This is due to simple laws of physics. The pressure will always equalize between the two 4,500 psi capacity vessels, thereby making it impossible to fully charge the 12 cu-fter. Live 'n learn, right? The efficacy for me in keeping the 75 cu-fter is that I can charge my gun directly when I'm at home, thereby reducing the duty on the 12 cu-fter.
I agree with you that getting a compressor is the best decision ever! I live in San Diego, the Mecca of dive shops, and I was unable to find a shop that would reliably fill my tank all the way to 4,500 psi. Now I have an unlimited supply of air on demand; I LOVE that!
Thanks for confirming my calculations re fill time of the pony bottle. The whole pneumatic thang confuses the hell outta me! It drives me crazy, and for me that's a short trip!
Speaking of crazy, I'm going bonkers waiting for my new RAW .357! I'm all set to hit the field except for one thing: I DON'T HAVE A RIFLE!! I should have kept my Impact until the RAW came in. But that's me; always jumpin' the gun.
I agree with you that getting a compressor is the best decision ever! I live in San Diego, the Mecca of dive shops, and I was unable to find a shop that would reliably fill my tank all the way to 4,500 psi. Now I have an unlimited supply of air on demand; I LOVE that!
Thanks for confirming my calculations re fill time of the pony bottle. The whole pneumatic thang confuses the hell outta me! It drives me crazy, and for me that's a short trip!
Speaking of crazy, I'm going bonkers waiting for my new RAW .357! I'm all set to hit the field except for one thing: I DON'T HAVE A RIFLE!! I should have kept my Impact until the RAW came in. But that's me; always jumpin' the gun.
Upvote 0
Yeah critta, it'll be interesting to see how my new rig works out. Everything looks good on paper, but I've been fooled before. One thing I am confident of though is the premium quality of RAWs!
Upvote 0
That's why I have a 3 liter bottle I take it depends on the gun But I can bout shoot anything an have enough air 3 liters is perfect for that but Im in between 68
an 90 cc for backpackin as weight a size do matter my pack was filled last year without an airgun or a bottle so a 90 cubic inch seems bit big for hunts dont do you think? Like if you get 4-5 fills on your condor so like around 3 fills if you had a 68 cubic inch one. Wouldnt that be more than plenty for any hunt as long as gun dont do 200 fpe a shot right.
Upvote 0