How often do you actually get a full tank fill?

[Scott G. Bonser]

What gear was designed for 2250? Sure there were some 1800 psi co2 bottles converted for scuba use back in the early early days, but I don't know of any commercial gear made for that.
Most of the early scuba tanks were 2475 psi and gear was designed for the tank pressure available at the time.

You can fill to whatever pressure make you happy, but I don't think your gear design is the limiting factor.

Good observation. I have gotten fills up to 2500psi and felt confidant that that pressure wouldn’t wear down my vintage gear. Before I knew better I got fills to around 3000 and had no trouble but my USD Royal Aquamaater was made in either ‘71 or ‘72 ( one of the last few years they were made ) and had no indication of excessive wear. It was later found out from numerous sources that if you were diving double-hose regulators that tanks should only get filled to 2250psi for best performance and less wear and tear. I am no expert but overwhelming advice regarding my tank fills are taken into consideration as parts for some of my vintage equipment is difficult if not impossible to find. When diving my single-hose regulators, I have gotten fills to 3500+/- psi w/no issues. I have never tried out ‘converted’ industrial gas tanks as I am leery of residues and reactiveness even if tanks have been cleaned and evaluated for contamination. Thanks for your input and ‘Good Diving’ to you