Per the 1954 Rules of Proof, here are the approximate CIP service pressure values:
3 tons--8,938 psi
3 1/4 tons--9,682 psi
3 1/2 tons--10,427 psi
4 tons--11,917 psi
These numbers SHOULD apply to guns proved under the 1925 rules; a 2 1/2" chambered gun proof would be equivalent to 3 tons; a 2 3/4" chambered gun to 3 1/4 tons.
A Brit Long Ton/sq in = 2240 psi (rounded off,,afaik).
3 Tons would be 6720 psi.
Where does the '8938 psi' number fit in.
Is one the service load pressure, the other the proof pressure? Or am I looking at this all wrong and have an incorrect conversion factor to begin with. Wouldn't the first time for that!
Certainly no math wizard here. Just wanting to understand.
Thanks.
