Blending discrepency ?

[colinicky]

If I have a 12l cylinder with 130bar of 23% in it & want to end up with a 32/10 trimix what do I need to add ?
According to 1 blending program I need to add 35 bar of O2 & 23 bar of He
using my other program I need 31bar O2 & 34 bar of He !
11 bar difference of He is a lot

I would agree with the first one but I could be missing something

[Colin Marriott]

I'd add 23 bar He, and 35 bar O2, for 232 bar mix.

(I wouldn't really, why bother with 32/10?)


ColinM

[Steve Jones]

Originally Posted by Colin Marriott

I'd add 23 bar He, and 35 bar O2, for 232 bar mix.

(I wouldn't really, why bother with 32/10?)


ColinM

For 232 bar add 35 bar He and 23 bar O2,

but have to agree with the previous poster, why would you want this mix.

S

[Colin Marriott]

Originally Posted by Steve Jones

For 232 bar add 35 bar He and 23 bar O2,

Me thinks you've got these the wrong way round

i.e. 23 bar of He in 232 bar . . . 23 / 232 = .099, or 10% near as dammit

ColinM

[colinicky]

Originally Posted by Colin Marriott

Me thinks you've got these the wrong way round

i.e. 23 bar of He in 232 bar . . . 23 / 232 = .099, or 10% near as dammit

ColinM

this was the logical figure that I worked out mathematically but I did wonder if I was missing something due to some obscure property of He .
The reason for the mix is for somebody who gets narked over 22m ish ,just reduces the END that little bit .