Bottle failed test

[angrybear]

Get a surface use only bottle so tested every 5 years rather than annually. I don't use pcps much but have a 12 litre 232 bar faber steel cylinder that does just fine. 1 fill lasts me 5 years I found id have to travel quite a way to find someone with a 300bar compressor so happy with large volume 232bar. Ex diving cylinders will of had a harder life than the airgun cylinders so I'd look for one of them personally.

Have you ever done the maths on how much more air is in a 300bar ?

1bar = 1volume, so assuming a 12ltr cyl, the 232bar contains 2784ltrs of air, a 300bar 3600ltrs,

airguns need to be refilled at around 120-140bar but as the cyl empties you will only equalise the pressure between cyl & rifle, so between 1440-1680 ltrs of that air in effect cannot be used, because it's under 120-140bar.

So in practical terms a 232bar 12ltr contains between 1104-1340ltrs of useable air, a 300bar 12ltr contains 1920-2160ltrs that's a lot more fill's/top up's.

caveat;
That is theory, air at pressure is funny so the figures don't actually work out exactly.

[maximus]

Have you ever done the maths on how much more air is in a 300bar ?

1bar = 1volume, so assuming a 12ltr cyl, the 232bar contains 2784ltrs of air, a 300bar 3600ltrs,

airguns need to be refilled at around 120-140bar but as the cyl empties you will only equalise the pressure between cyl & rifle, so between 1440-1680 ltrs of that air in effect cannot be used, because it's under 120-140bar.

So in practical terms a 232bar 12ltr contains between 1104-1340ltrs of useable air, a 300bar 12ltr contains 1920-2160ltrs that's a lot more fill's/top up's.

caveat;
That is theory, air at pressure is funny so the figures don't actually work out exactly.

Not done any maths, 300 bar cylinders were only just becoming the thing when I got mine 2nd hand, it does for me no problem.

[Bellycrawler]

I see them for sale quite often without a test. Unlike a car that has advisores with a pass that need sorting before the next test a dive tank Is either 100% at test or scrapped by the test center. A risk buying an out of test tank but a fair gamble it will be OK unless stored outside in a garage or shed etc to make it go rusty.