<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div><span>Alan,</span></div><div id="yui_3_16_0_ym19_1_1488581149143_3193"><span id="yui_3_16_0_ym19_1_1488581149143_3192">Internal volume atmospheric pressure.</span></div><div id="yui_3_16_0_ym19_1_1488581149143_3193"><span>Hank</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Friday, March 3, 2017 3:24 PM, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv3239637273"><div><div>Hank, </div><div>firstly in the US they refer to scuba tanks by their filled volume ie.</div><div>a 80 cu ft tank has 80 cu ft of air when filled. Whereas the rest of the</div><div>World tends to refer to the internal volume of the tank in litres ie. a </div><div>10 litre dive tank. </div><div>By 10.7 cubic feet are you referring to internal volume or filled capacity?</div><div>Alan</div><div><br clear="none"><br clear="none"><div>Sent from my iPad</div></div><div class="yiv3239637273yqt1248092441" id="yiv3239637273yqt27867"><div><br clear="none">On 4/03/2017, at 10:30 AM, Cliff Redus via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div dir="ltr"><div>84.8 lbs assuming a 60F ambient temperature. See attached derivation.</div><div><br clear="none"></div><div>Cliff</div></div><div class="yiv3239637273gmail_extra"><br clear="none"><div class="yiv3239637273gmail_quote">On Fri, Mar 3, 2017 at 2:52 PM, hank pronk via Personal_Submersibles <span 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>></span> wrote:<br clear="none"><blockquote class="yiv3239637273gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div style="color:rgb(0,0,0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;background-color:rgb(255,255,255);"><div><span>Alan,</span></div><div dir="ltr" id="yiv3239637273m_-7869603393181715374yui_3_16_0_ym19_1_1488573976006_3364"><span id="yiv3239637273m_-7869603393181715374yui_3_16_0_ym19_1_1488573976006_3363">I need to know how much a 10.7 cubic foot tank will extra when pumped up to 1,500 psi. And how many cubic feet of air will I have when it is pumped up.</span></div><div dir="ltr" id="yiv3239637273m_-7869603393181715374yui_3_16_0_ym19_1_1488573976006_3364"><span>Hank</span></div> <div class="yiv3239637273m_-7869603393181715374qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv3239637273m_-7869603393181715374yahoo_quoted" style="display:block;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr"><font face="Arial" size="2"> On Friday, March 3, 2017 12:28 PM, Alan via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs. org</a>> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv3239637273m_-7869603393181715374y_msg_container"><div id="yiv3239637273m_-7869603393181715374yiv4906443182"><div><div><span></span></div><br clear="none"><div><div>Hank,</div><div>air weighs .0807 lbs per cubic foot approximately, depending on temperature.</div><div>So if you have an 80 cubic foot scuba tank the air weight full is 6.45 lb.</div><div>A scuba tank is 80 cubic ft at 3000 psi. If you halve the pressure you halve</div><div>the amount of air & weight. In other words, if you double the pressure you</div><div>double the weight for a given volume.</div><div>Let us know what you are trying to calculate if this doesn't help.</div><div>Alan</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"><div>Sent from my iPad</div></div><div class="yiv3239637273m_-7869603393181715374yiv4906443182yqt7607906670" id="yiv3239637273m_-7869603393181715374yiv4906443182yqt84539"><div><br clear="none">On 4/03/2017, at 6:33 AM, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs. org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div style="color:rgb(0,0,0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;background-color:rgb(255,255,255);"><div id="yiv3239637273m_-7869603393181715374yiv4906443182yui_3_16_0_ym19_1_1488561134912_6309">Okay, I am stumped! can someone give me a formula to calculate the weight of air at a particular psi per cubic foot.</div><div id="yiv3239637273m_-7869603393181715374yiv4906443182yui_3_16_0_ym19_1_1488561134912_6309">Thank you</div><div id="yiv3239637273m_-7869603393181715374yiv4906443182yui_3_16_0_ym19_1_1488561134912_6309">Hank</div></div></div></blockquote></div><blockquote type="cite"><div><span>______________________________ _________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs. org</a></span><br clear="none"><span><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></span><br clear="none"></div></blockquote></div></div></div><br clear="none"><div class="yiv3239637273m_-7869603393181715374yqt7607906670" id="yiv3239637273m_-7869603393181715374yqt65939">______________________________ _________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><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"><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><br clear="none"><br clear="none"></div> </div> </div> </div></div></div><br clear="none">______________________________ _________________<br clear="none">
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