Saw a video on tanks as well as a site to buy used tanks . Good info for buying used tanks .Marvin
https://www.youtube.com/watch?v=AyOfZ94Iz80
https://airtanksplus.com/stikman-learning-center/
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Saw a video on tanks as well as a site to buy used tanks . Good info for buying used tanks .Marvin
https://www.youtube.com/watch?v=AyOfZ94Iz80
https://airtanksplus.com/stikman-learning-center/
Interesting video, and web site.
The air tank I purchased http://castboolits.gunloads.com/show...ll-in-the-hole
Is new.
Whatever I purchased is probably what I will have the rest of my life, turning 62 this month, should be 75 or so when the 15 year tank life ends. The video mentioned a maximum life of 15 years for carbon fiber tanks, but since the video was made the DOT has a new rule that doubles tank life to 30 years.
I went here, http://www.airtanksforsale.com/ and bought the tigershark 72 cubic foot tank, a firehouse fill adaptor, the two gauge, with slow (10-12 seconds) valve, and their tank armor, protective covering. This web site is rarely up to date, and purchases from airtanksforsale are best done via telephone.
Not cheap, they advertise using all American made components. I plan to only fill it from systems for breathing air for now, to avoid water and oil contamination.
I will be watching developments in home compressors. No promises on buying one or not.
Well I found this info and it looks as if they are selling extended life used tanks .If you look at the bottom of the page there is a link . Marvin
http://dalmatianfire.com/life-extension-cylinders-faq/
Youch! might be easier to just buy a new one in 15 years.
From what I know personally I don't think there is any air tank that can last for 30 years. I usually buy from https://syacecare.com/about-us/ and they make it clear that the usage can't exceed 15 years whether it's D.O.T, CE or GB air tank for safety reasons.
Ummm... I am still using 72 c.f. 2250 psi + 10% SCUBA tanks made in 1977, and every 5 years they pass hydro just fine.Quote:
Originally Posted by baddestXVI
DOT rated tanks are still at 15 years. No one will fill them past that point, nor certify them per DOT certification. I know nothing about SCUBA tanks, they aren't very practical for any PCP airguns. Carbon fiber tanks are rated up to 4500psi and most guns are at least 3000psi. A SCUBA tank won't fill any of those even ONE TIME. There's a difference between SCBA and SCUBA tanks. Carbon fiber SCBA tanks are much, much lighter and hold a LOT more air.
Think I will stick with my break barrels.
From what I know personally I don't think there is ANY air tank that can last for 30 years
The only preface was DOT rated, not material it was made from.
There are steel SCUBA tanks that are are rated to 4500 psi, and the amount they hold is a function of both pressure AND initial volume (PV=nRT)
While carbon and carbon wrapped aluminum tanks are lighter than steel, that is just about their only benefit other than internal corrosion when filled with less than dry air.
A SCUBA tank won't fill any of those even ONE TIME
My 3500 psi, 100 c.f. Steel tanks made in 1992 under current hydro fill my 3000 psi PCP gun full just fine, I usually do a cascade fill using the lower pressure tank first so I can get more full fills out of the high pressure tank.
A cheap steel 2250psi SCUBA tank will greatly improve how many full fills you will get out of a 4500 psi SCBA carbon tank when using cascade fills.
Yes, cascade filling can be done. It requires more tanks and more labor. In the end you can't overcome the laws of physics. You're going to need the same amount of pressurized air to be put in the airgun tank. I looked at SCUBA tanks before I began to understand what was being done. They weight a LOT more than an aluminum carbon fiber wrapped tank and hold a lot more pressure. A steel SCUBA tank weighs 40lbs compared to my 13lb carbon fiber tank and only held 3000psi. If you're using something like a Benjamin Marauder (the most sold PCP gun on the planet...I don't have one) you wouldn't get one full fill from the SCUBA tank. The Marauder takes 3000psi and once you started drawing off the SCUBA tank it immediately begins to have less than 3000 lbs of pressure. Here's a good link to how many fills you get from a source tank to your pcp gun tank. https://www.airgunsofarizona.com/Tanks/FillCalc.html If you just want to hook up and fill your pcp gun it's way easier using a carbon fiber SCBA 4500psi tank. No offense to what you're doing, but it's just more cost and more trouble than it's worth to me to do it.
My post was more about previous statement about pressure vessels that were not true, than the best tank to use for your applacation.
SCUBA tanks are not limited to 3k psi.
You do need a different regulator for pressure greater than 3442 psi (DIN, 7 thread deep)
Because I have so many SCUBA tanks (1850 psi ponys, 2105 psi, 2250+ psi, 2400+ psi, 3000 psi, 3442 pso, 3500 psi) it is easy for me. Your mileage may vary.
I do not use 4500 psi or 300 BAR (4350 psi) because they are much harder on the compressor and regulator.