<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yiv5743480306"><div id="yui_3_16_0_ym18_1_1458243221435_5498"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;" id="yui_3_16_0_ym18_1_1458243221435_5497"><div id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3803"><span id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3844">Hi Sean,</span></div><div id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3805"><span id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3804">you are not showing a third grove for the vacuum path!</span></div><div id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3806">If you get a good metal to metal seal either side of the vacuum hole then you</div><div id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3807">won't be able to monitor any leak or seat the rest of the o-ring, or is their a</div><div dir="ltr" id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3807">grove in the landing for this.</div><div dir="ltr" id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3807">Cheers Alan</div><div class="yiv5743480306qtdSeparateBR" id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3808"><br clear="none"><br clear="none"></div></div></div></div><div class=".yiv5743480306yahoo_quoted" id="yui_3_16_0_ym18_1_1458243221435_5504"> <div id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3813" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3812" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr" id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3811"> <font id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3810" size="2" face="Arial"> </font><div class="qtdSeparateBR" id="yui_3_16_0_ym18_1_1458243221435_5503"><br><br></div><div class="yiv5743480306yqt1480981970" id="yiv5743480306yqtfd03698"><hr id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3809" size="1"> <b><span style="font-weight:bold;">From:</span></b> Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Thursday, March 17, 2016 5:29 PM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> [PSUBS-MAILIST] hatch detail<br clear="none"> </div></div><div class="yiv5743480306yqt1480981970" id="yiv5743480306yqtfd70208"> <div class="yiv5743480306y_msg_container" id="yiv5743480306yui_3_16_0_ym18_1_1458243221435_3884"><br clear="none">I sketched the double o-ring seal idea on one of my hatches, to<br clear="none">illustrate what I was getting at. Image is attached. The channel<br clear="none">through the pressure boundary would connect to a vacuum pump and<br clear="none">pressure transducer.<br clear="none"><br clear="none">Sean<br clear="none"><br clear="none"><br clear="none">_______________________________________________<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"><br clear="none"><br clear="none"></div> </div></div><div class="yiv5743480306yqt1480981970" id="yiv5743480306yqtfd35418"> </div></div><div class="yiv5743480306yqt1480981970" id="yiv5743480306yqtfd46010"> </div></div></div></body></html>