<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><div>I am unsure of the depth rating of an empty scuba tank. It could be easily found out on a solidworks simulation.</div><div>Thanks,</div><div>Scott</div><div><br></div><div><br></div><div><br></div><div id="composer_signature"><div style="font-size:85%;color:#575757" dir="auto">Sent from my U.S. Cellular® Smartphone</div></div><div><br></div><div style="font-size:100%;color:#000000"><!-- originalMessage --><div>-------- Original message --------</div><div>From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> </div><div>Date: 7/1/17 12:34 PM (GMT-05:00) </div><div>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> </div><div>Subject: Re: [PSUBS-MAILIST] O2 tanks </div><div><br></div></div>Thanks' Scott,Do you know what the max depth rating for an empty Scuba O2 tank is. I suppose you could increase the rating by using only part of the volume and leave pressure inside them. A sub could carry several in that case since they are close to neutral buoyant. Hank <br><br> On Saturday, July 1, 2017 8:25 AM, Scott Waters via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br> <br><br> Hank,Alvin has all the O2 supply internally. Pisces has the mission O2 internally and emergency supply externally in special steel cylinders that are pressure tested to 1.25 max depth while empty.Thanks,Scott Waters<br><br><br>Sent from my U.S. Cellular® Smartphone<br>-------- Original message --------From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> Date: 7/1/17 9:59 AM (GMT-05:00) To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> Su</body></html>