<html><head></head><body><p dir="ltr">It is not the personnel transfer hatch that presents the problem, but rather the egress hatches in the lockout chamber, as those flanges will see the lockout pressure in normal operation. I can get away with a larger range pressure transducer for those hatches, but then I lose measurement resolution.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On March 2, 2016 9:32:49 AM MST, 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="yui_3_16_0_1_1456935008552_12886"><span id="yui_3_16_0_1_1456935008552_12916">Sean,</span></div><div id="yui_3_16_0_1_1456935008552_12886" dir="ltr"><span id="yui_3_16_0_1_1456935008552_12985">that sounds a good idea. Nuytco set the o-ring on the deep worker hatch externally with a vacuum</span></div><div id="yui_3_16_0_1_1456935008552_12886" dir="ltr"><span id="yui_3_16_0_1_1456935008552_12986">pump, but with your twin seal idea you could do this from within the sub without decreasing the hull pressure.</span></div><div dir="ltr" id="yui_3_16_0_1_1456935008552_12889"><span id="yui_3_16_0_1_1456935008552_12888"> If the transducers are just monitoring the vacuum between the o-rings can't the transducer be</span></div><div dir="ltr" id="yui_3_16_0_1_1456935008552_12891"><span id="yui_3_16_0_1_1456935008552_12890">mounted
on the 1atm side of the diver lockout hatch & not be exposed to diver lockout pressure?</span></div><div dir="ltr" id="yui_3_16_0_1_1456935008552_12885"><span>Alan</span></div><div dir="ltr" id="yui_3_16_0_1_1456935008552_12858"><span><br /></span></div><div class="qtdSeparateBR" id="yui_3_16_0_1_1456935008552_12856"><br /><br /></div><div class="yahoo_quoted" id="yui_3_16_0_1_1456935008552_12853" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1456935008552_12852"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1456935008552_12851"> <div dir="ltr" id="yui_3_16_0_1_1456935008552_12855"> <font size="2" face="Arial" id="yui_3_16_0_1_1456935008552_12854"> </font><hr size="1" id="yui_3_16_0_1_1456935008552_12857" /><font size="2" face="Arial" id="yui_3_16_0_1_1456935008552_12854">
<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@psubs.org" <personal_submersibles@psubs.org> <br /> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, March 3, 2016 1:41 AM<br /> <b id="yui_3_16_0_1_1456935008552_12884"><span style="font-weight: bold;" id="yui_3_16_0_1_1456935008552_12883">Subject:</span></b> [PSUBS-MAILIST] Hatch interlock<br /> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1456935008552_12850"><br /><div id="yiv5626838720"><div dir="ltr" id="yui_3_16_0_1_1456935008552_12859">Doing some further design on my lockout submersible project, I came up with a novel way to implement hatch interlocks, which doubles as a seal condition monitor, and a means of establishing a preliminary seal in the absence of a pressure differential without relying on the hatch dogs to provide
the initial o-ring squeeze.</div>
<div dir="ltr" id="yui_3_16_0_1_1456935008552_12860">My design entails two o-rings per hatch (vessel has six hatches: cabin loading / escape, outer lockout loading / escape, inner lockout loading / escape, inner lockout egress , outer lockout egress, and transfer). These o-rings are concentric face seals, each residing within a half dovetail groove for positive retention of each o-ring when the hatch is opened or manipulated. The grooves are oriented such that the flat face of each half dovetail faces the intermediate space between the two rings. This intermediate volume is not isolated, but rather connected (on the sealing flange side) to a vacuum transducer, and piped through appropriate valving to a vacuum pump. When the hatch is closed, this intermediate space is pulled to vacuum (as strongly as the pump allows), then locked off, and the strength of this vacuum is measured by the transducer and continuously monitored. The interlock is clear as long as the vacuum holds, and
activates the moment the seal is rele!
ased,
instead of relying on some arbitrary movement of the hatch to indicate that it is open.</div>
<div dir="ltr" id="yui_3_16_0_1_1456935008552_12861">Apart from the obvious expense, I see a potential problem with exposing those vacuum transducers in the lockout hatches to high pressure, necessitating either a less sensitive transducer that will withstand the pressure, or some means of isolating the transducer when the pressure approaches the limit of its range - I'm still working this out in my head, but I thought I would share anyway.</div>
<div dir="ltr" id="yui_3_16_0_1_1456935008552_13102">Sean<br />
</div>
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