Luxfer - are these scuba tanks?

[Tanks A Lot]

In this case, their TEST (TP) pressure is 220bar, which makes their working pressure about 130/132bar. (test = 5/3rds working).

That is not entirely correct. Under BS5045-8, the test pressure is defined as:

Whichever is greater of:
a) 1.5 times the charged pressure at 15°C (for permanent gases);
b) 1/0.85 times the pressure developed by the gas at the reference temperature (for permanent and liquefiable gases).

It is not all that cut and dry, as there are a couple of exceptions with regards to certain gases. For SCUBA a good rule of thumb in the European market is that the test pressure is 1.5 times the working pressure. Unlike in the states where it is usually 5/3 of the working pressure.

That puts the working pressure of these cylinders at 147bar, holding roughly 760L of air.

I would not use these for diving. They are impractical, even as a pony bottle.

 

[Edward3c]

BS 5045-8​

Transportable gas containers-Specification for seamless aluminium alloy gas containers of water capacity 0.5 L up to 15 L and up to 300 bar charged pressure at 15°C for special portable application​

Not sure why you posted this since that specification applies to a whole range of cylinders? In this case, their TEST (TP) pressure is 220bar, which makes their working pressure about 130/132bar. (test = 5/3rds working). They are definitely not 300bar cylinders and will almost for sure rupture at those pressures.

Notice it says 0.5 to 15L and UP TO 300bar. Its a catch all standard.

 

[Tanks A Lot]

Notice it says 0.5 to 15L and UP TO 300bar. Its a catch all standard.

That's correct, but it still does not imply that every cylinder that falls under BS5045-8 is rated up to 300bar. Quite the contrary, they CAN be rated up to 300bar, but most are not. All that it means, is that if they are rated above 300bar they do not fall under BS5045-8.

 

[rjack321]

That is not entirely correct. Under BS5045-8, the test pressure is defined as:



It is not all that cut and dry, as there are a couple of exceptions with regards to certain gases. For SCUBA a good rule of thumb in the European market is that the test pressure is 1.5 times the working pressure. Unlike in the states where it is usually 5/3 of the working pressure.

That puts the working pressure of these cylinders at 147bar, holding roughly 760L of air.

I would not use these for diving. They are impractical, even as a pony bottle.

Well they are 3/4" necked Luxfer cylinders made for the Australian CO2 market. The working pressure isn't totally clear but that's not all that critical since they are going to be buoyant AF. (as fudge)

Notice it says 0.5 to 15L and UP TO 300bar. Its a catch all standard.

Which is basically useless for figuring out what these are, I mean they say TP 220 and CO2 right there on them.

 

[happy-diver]

and also perfect if you have a compressor for doing your tyres instead of dragging that bloody hose around

 

[rjack321]

and also perfect if you have a compressor for doing your tyres instead of dragging that bloody hose around

Or inflatable boats

 

[happy-diver]

Definitely inflatable boats, those bellows, I used to pay people to do that

When your are on the hunt for that next magnificent dive site in your 4x4



and you need to let your tyres down

so just bolt a set of minis in your car

 

[happy-diver]

And what really is the bestest of everything is blowing your car interior out instead of vacuuming
about the only time slinging an auxilliary bottle, not pretending to be practicing technical is valid