<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="yui_3_16_0_1_1458375108602_2792">Thanks for the explanation Sean.</div><div id="yui_3_16_0_1_1458375108602_2874">I had a look at the ram frame strength issue in the G.L. rules, & they don't mention anything</div><div id="yui_3_16_0_1_1458375108602_2873" dir="ltr">specific about their strength.</div><div id="yui_3_16_0_1_1458375108602_2968" dir="ltr">I did have a technical advice contract with G.L., & through correspondence realized that there were some areas that were black & white & some areas that were grey. If it looked OK & you could justify yourself then it would pass. </div><div id="yui_3_16_0_1_1458375108602_3097" dir="ltr">Alan</div><div id="yui_3_16_0_1_1458375108602_3190" dir="ltr"><br></div><div class="qtdSeparateBR" id="yui_3_16_0_1_1458375108602_2791"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_1_1458375108602_2796" style="display: block;"> <div id="yui_3_16_0_1_1458375108602_2795" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1458375108602_2794" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1458375108602_2793" dir="ltr"> <font id="yui_3_16_0_1_1458375108602_2798" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_1_1458375108602_2797"> <b><span style="font-weight:bold;">From:</span></b> Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, March 18, 2016 1:23 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] hatch detail<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1458375108602_3162"><br><div id="yiv8955771390"><div id="yui_3_16_0_1_1458375108602_3161"><div id="yui_3_16_0_1_1458375108602_3160" 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.</div>
<div id="yui_3_16_0_1_1458375108602_3193" dir="ltr">Sean<br clear="none">
</div>
<br clear="none"><br clear="none"><div class="yiv8955771390yqt5656332710" id="yiv8955771390yqtfd61975"><div class="yiv8955771390gmail_quote" id="yui_3_16_0_1_1458375108602_3194">On March 17, 2016 1:42:08 PM MDT, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="yiv8955771390gmail_quote" id="yui_3_16_0_1_1458375108602_3200" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex;">
<div id="yui_3_16_0_1_1458375108602_3199" style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div id="yiv8955771390"><div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_5498"><div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_5497" style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3803"><span id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3844">Hi Sean,</span></div><div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3805"><span id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3804">you are not showing a third grove for the vacuum path!</span></div><div id="yiv8955771390yui_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="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3807">won't be able to monitor any leak or seat th!
e rest
of the o-ring, or is their a</div><div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3807" dir="ltr">grove in the landing for this.</div><div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3807" dir="ltr">Cheers Alan</div><div class="yiv8955771390qtdSeparateBR" id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3808"><br clear="none"><br clear="none"></div></div></div></div><div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_5504"> <div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3813" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3812" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3811" dir="ltr"> <font id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3810" face="Arial" size="2"> </font><div class="yiv8955771390qtdSeparateBR" id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_5503"><br clear="none"><br clear="none"></div><div class="yiv8955771390yqt1480981970" id="yiv8955771390yqtfd03698"><hr size="1" id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3809"> <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="yiv8955771390yqt1480981970" id="yiv8955771390yqtfd70208"> <div class="yiv8955771390y_msg_container" id="yiv8955771390yui_3_16_0_ym18_1_1458243221435_3884"><br clear="none">I sketched the double o-ring seal idea on one of my hat!
ches,
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 href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none"></div> </div></div><div class="yiv8955771390yqt1480981970" id="yiv8955771390yqtfd35418"> </div></div><div class="yiv8955771390yqt1480981970" id="yiv8955771390yqtfd46010"> </div></div></div><div style="margin-top:2.5em;margin-bottom:1em;border-bottom:1px solid #000;"></div><pre class="yiv8955771390k9mail"></pre><hr><br clear="none">Personal_Submersibles mailing list<br clear="none">Personal_Submersibles@psubs.org<br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></blockquote></div></div></div></div><br><div class="yqt5656332710" id="yqtfd97928">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a id="yui_3_16_0_1_1458375108602_3204" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>