ScubaPro Twin 45s
- My buddy Rich just acquired a set of ScubaPro tanks that are sized like the proverbial "Twin 38s" but unlike our familiar 1800 psi and 1880 psi working pressures, these are marked 2015 psi. We know they are ScubaPro so I did a little research into the ScubaPro catalog collection on VDS.
- In 1970 and 71, they called these "Twin 40s" and gave no pressure data. In 1972, they actually referred to them as "Twin 38s" but still gave no pressure data. Then in 1973, they called them "Twin45s" at 2200 psi. They stuck with that description in '74 and '75. But then in 1976 they finally gave some useful numbers: 45 cf at 2216 psi with a working pressure of 2015 psi.
- Well I did a little calculating with the pressure and volume numbers and came up with the following.
2216 - 45 cf
2015 - 40.9 cf
1880 - 38.1 cf
1800 - 36.5 cf
The other Twin 38s that I know of at 1880 psi are Sportsways. So really all that this calculating tells us is that the size of these tanks is about the same as all "Twin 38s". But the higher pressure will most likely mean thicker steel and heavier weight. I think I'll weigh some Various Twin 38s to see how they differ in weight.