Diver-Drex
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Haha, well done sir.
Cave Fills on LP tanks
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Many, many years ago, one of my dive buddies started to do what we now know as "technical diving"... although in reality, it was just dumb diving. We still call him "Fearless Fred, The Bionic Bottom Sounder".
I recall him telling me about a trip he made to some factory that manufactured steel dive tanks and that the engineer there told him that there was absolutely no difference between LP and HP SCUBA cylinders, other than the neck stamps. It was simpler and less expensive to make them all the same, which makes total sense. Fearless Fred routinely filled his 72s (2250 rating?) to close to 4000 PSI with the burst disk replaced with a bolt. I think he said that the engineer had told him that a NEW tank would have a burst pressure of close to 20,000 psi.
This is all hearsay of course and if you blow your house up pumping your tanks up to 19,500 psi, I don't wanna hear about it.
Having said all this, I just had my LP80s hydro'd. There was a little rust in one tank which took a little whipping to clean up. The shop does hydros on site and when I picked them up, the owner (and hydro tech) promptly filled them up to 3200 psi. In spite of all his whining about my slightly rusty tank, he had no hesitation in "over-filling" them.
Obviously all of these discussions assume the tanks in question are in top shape. I little pitting completely changes everything.
I recall him telling me about a trip he made to some factory that manufactured steel dive tanks and that the engineer there told him that there was absolutely no difference between LP and HP SCUBA cylinders, other than the neck stamps. It was simpler and less expensive to make them all the same, which makes total sense. Fearless Fred routinely filled his 72s (2250 rating?) to close to 4000 PSI with the burst disk replaced with a bolt. I think he said that the engineer had told him that a NEW tank would have a burst pressure of close to 20,000 psi.
This is all hearsay of course and if you blow your house up pumping your tanks up to 19,500 psi, I don't wanna hear about it.
Having said all this, I just had my LP80s hydro'd. There was a little rust in one tank which took a little whipping to clean up. The shop does hydros on site and when I picked them up, the owner (and hydro tech) promptly filled them up to 3200 psi. In spite of all his whining about my slightly rusty tank, he had no hesitation in "over-filling" them.
Obviously all of these discussions assume the tanks in question are in top shape. I little pitting completely changes everything.
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