Thanks rx7diver,rx7diver wrote: ↑Mon Sep 23, 2019 3:44 pmA two-wheel hand truck or dolly (is that what they're called?) and a ramp could be used to move the cascade cylinders, one at a time, into the truck bed. Be sure to use the valve cover/cage, and be sure to chain the cylinders in place (to keep them from shifting around). Do you think DOT would have any problem with this? We'd need to check.
If the 6,000 psig cascade bottles prove too massive (I don't have any experience with them), then use 4,500 psig cascade bottles (I do have experience with these), instead, which weight ~150 lbs each and hold ~450 cu ft of air at their service pressure.
(The quick and dirty Excel example I shared here a few months ago can be tweaked to show just how many classic 72's can be filled from empty to full + 10% using only a few of these cascade cylinders.)
- Actually, I was using AL80s and an HP80 to cascade fill my first set of Twin 38s (1800 psi) a few years back. And I did it that way with a few more tanks when we did the Sea Hunt Forever shows. Its amazing how many fills you can get on low pressure tanks... Especially when you breathe them down to zero psi!
- As for the bigger cascade tanks, I think I run into the problem that my little compressors aren't supposed to pump that high of pressures (4500 and 6000 psi). On the other hand, I don't NEED them to be that high to fill my 1800 psi tanks.
- BUT... The original reason for bringing a compressor is so you don't have to bring a bunch of tanks! Aaargh! My brain hurts!