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<div>Hi Sean,</div><div>I am just curious how you calculated the depth of a concrete sphere. What did you use for yield strength? It seems to me the compressive strength should be close to the yield strength? </div><div>Just for interest sake Lafarge is producing High Performance concrete at 12,000 psi after 12 hr cure, amazing.</div><div>Hank</div><div><br></div><div><br></div>
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On Wednesday, January 3, 2018, 12:04:32 PM MST, hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div>Steve,</div><div>Here in Canada we can not keep our original tank, it is swapped out. I fill from a 122 cu ft tank into my small aluminum medical tanks. I think Sean's suggestion of a charcoal filter on the scrubber is a good idea to maybe pick up a nasty.</div><div>Hank</div><div><br clear="none"></div>
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On Wednesday, January 3, 2018, 11:10:41 AM MST, Steve McQueen via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div dir="ltr">I tried to search the archives but it wasn't very friendly. Sorry to again ask about something I know has probably been discussed.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">I wanted to double ck. my O2 strategy. After some investigation it seems I will buy a new steel high pressure oxygen tank for external mounting. My plan is to have it refilled with "commercial grade" O2 vs. medical grade 02. As long as I keep my "personal" tank and not allow the filler to swap tanks I should create a "chain of custody" that will help me feel good about not having contamination.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">I am wondering how others are managing.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">Thanks,<br clear="none"></div><div dir="ltr">Steve<br clear="none"></div><div dir="ltr">_______________________________________________<br clear="none"></div><div dir="ltr">Personal_Submersibles mailing list<br clear="none"></div><div dir="ltr"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"></div><div dir="ltr"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
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