<html><head></head><body><p dir="ltr">Sorry Alan, the detail was suppressed when I created the image. It isn't really a third groove, but rather just a bit of relief over most of that middle area so that there is positive clearance all the way around (no metal to metal contact). I can get away with this because the conical bearing area is predominately carrying the load.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On March 17, 2016 1:42:08 PM MDT, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<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><p style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre class="k9mail"><hr /><br />Personal_Submersibles mailing list<br />Personal_Submersibles@psubs.org<br /><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br /></pre></blockquote></div></body></html>