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Assuming

V1 = Donor cylinder size

P1 = Donor cylinder pressure

V2 = Recipient cylinder size

P2 = Current recipient cylinder pressure

P3 = Equalised pressure

Then

P3 =

__(V1 x P1) + (V2 x P2)__

(V1 + V2)

Therefore assuming 300bar 20 donor and 100b left in a twin 12 set, the equalised pressure would be 190.90 bar.

Also as 90.9 bar of gas has been shifted, then could I effectively calculate the re-cut mix if each cylinder had a different mix in it.

Although I would neve dive it without analysing, it would be great to be able to do this for planning purposes.

Cheers