<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_ym19_1_1483036657255_3715"><span>Cliff,</span></div><div id="yui_3_16_0_ym19_1_1483036657255_3802"><span id="yui_3_16_0_ym19_1_1483036657255_3801">I looked at machining but they wouldn't fit in my lathe.</span></div><div id="yui_3_16_0_ym19_1_1483036657255_3800" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3813">I was specific about what I ordered and the manufacturer has got</span></div><div id="yui_3_16_0_ym19_1_1483036657255_3882" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3881">it wrong. I have been talking with them & I'll send them back.</span></div><div id="yui_3_16_0_ym19_1_1483036657255_2835"><span id="yui_3_16_0_ym19_1_1483036657255_2990"> I am trying to keep as close as practicable to GL rules.</span></div><div id="yui_3_16_0_ym19_1_1483036657255_2986"><span id="yui_3_16_0_ym19_1_1483036657255_2985">They require a valve at the hull for any gas coming in to the</span></div><div id="yui_3_16_0_ym19_1_1483036657255_2994" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3096">cabin. Although there is no gas lines coming in & through the cabin,</span></div><div id="yui_3_16_0_ym19_1_1483036657255_3765" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3764">I would be pretty sure they would require a valve between the hull</span></div><div id="yui_3_16_0_ym19_1_1483036657255_3614" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3769">& the pressure transducer. With 6 tanks to monitor, this will save</span></div><div id="yui_3_16_0_ym19_1_1483036657255_3575" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3574">on the cost of 6 valves, but more importantly will save space inside</span></div><div id="yui_3_16_0_ym19_1_1483036657255_3552" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3551">the hull, & as these valves would need to be clustered within arms</span></div><div id="yui_3_16_0_ym19_1_1483036657255_3577" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3576">reach, that space in that area would be an important saving.</span></div><div id="yui_3_16_0_ym19_1_1483036657255_3645" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3661">Also, as I have said previously, a failed o-ring on the hull interface </span></div><div id="yui_3_16_0_ym19_1_1483036657255_3724" dir="ltr"><span id="yui_3_16_0_ym19_1_1483036657255_3734">with high pressure air / O2 could lead to a fatal </span><span id="yui_3_16_0_ym19_1_1483036657255_3719">condition in a small </span></div><div id="yui_3_16_0_ym19_1_1483036657255_3749" dir="ltr"><span>one person submersible.</span></div><div dir="ltr"><span>Cheers Alan</span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1483036657255_2834"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1483036657255_2807" style="display: block;"> <div id="yui_3_16_0_ym19_1_1483036657255_2806" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1483036657255_2805" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1483036657255_2804" dir="ltr"> <font id="yui_3_16_0_ym19_1_1483036657255_2803" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym19_1_1483036657255_2814"> <b><span style="font-weight: bold;">From:</span></b> 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, December 30, 2016 3:33 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Pressure Transducer<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1483036657255_2917"><br><div id="yiv1938343669"><div id="yui_3_16_0_ym19_1_1483036657255_2916"><div>If it were me I would machine out the conical section and then machine off enough of the 10mm threaded shank until it will mate. </div><div><br clear="none"></div><div>Actually i would abandon this approach altogether and put the pressure transmitters inside the boat and use Swagelok fittings and ss tubing to connect to regulator.</div><div id="yui_3_16_0_ym19_1_1483036657255_3921"><br clear="none"></div><div>O-ring seals are designed for high pressure. Likelihood of leak into boat is small.</div><div> </div><div>Cliff<br clear="none"><br clear="none"><div><br clear="none"><div>Cliff Redus</div></div></div><div class="yiv1938343669yqt1901282403" id="yiv1938343669yqt65778"><div id="yui_3_16_0_ym19_1_1483036657255_2915"><br clear="none">On Dec 28, 2016, at 8:58 PM, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="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: 16px; background-color: rgb(255, 255, 255);"><div><span></span></div><div class="yiv1938343669qtdSeparateBR" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_5920">Hank,</div><div class="yiv1938343669qtdSeparateBR" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_5913">yes it has a hole down the middle of the threaded fitting.</div><div class="yiv1938343669qtdSeparateBR" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_6031" dir="ltr">I only have 10mm of thread. I could machine a few mm off the end but still</div><div class="yiv1938343669qtdSeparateBR" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_6075" dir="ltr">wouldn't have a flat area to squash the o-ring against. The female fitting is slightly</div><div class="yiv1938343669qtdSeparateBR" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_6172" dir="ltr">tapered initially, & the o-ring is meant to fit in to this taper.</div><div class="yiv1938343669qtdSeparateBR" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_6173" dir="ltr">If I put a nut on as a spacer, the internal face of the o-ring would be against the thread,</div><div class="yiv1938343669qtdSeparateBR" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_6174" dir="ltr">& high pressure air could leak down between the thread & nut.</div><div class="yiv1938343669qtdSeparateBR" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_6175" dir="ltr">Alan</div><div class="yiv1938343669qtdSeparateBR" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_6074" dir="ltr"><br clear="none"><br clear="none"></div><div class="yiv1938343669yahoo_quoted" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_5939" style="display: block;"> <div id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_5938" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_5937" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_5936" dir="ltr"> <font id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_5935" face="Arial" size="2"> </font><hr size="1" id="yiv1938343669yui_3_16_0_ym19_1_1482978871116_5940"> <b><span style="font-weight: bold;">From:</span></b> hank pronk via Personal_Submersibles <<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"> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<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"> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, December 29, 2016 3:15 PM<br clear="none"> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Pressure Transducer<br clear="none"> </div> <div class="yiv1938343669y_msg_container"><br clear="none"><div id="yiv1938343669"><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"><span>I assume the threaded shaft is just a means of attaching it with a hole in the middle. If so, file it shorter, put a nut on the tread first and the nut will fix the end of the tread when you remove it.</span></div><div id="yiv1938343669yui_3_16_0_ym19_1_1482977512882_5789" dir="ltr"><span>Hank</span></div> <div class="yiv1938343669qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv1938343669yahoo_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 class="yiv1938343669yqt0072243765" id="yiv1938343669yqt03159"><div dir="ltr"><font face="Arial" size="2"> On Wednesday, December 28, 2016 6:47 PM, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv1938343669y_msg_container"><div id="yiv1938343669"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2406"> Just received my 6 pressure transducers from China.</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2407">These were tailor made for me to fit in to the high pressure port</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2463" dir="ltr">of my first stage regulator; So rather than have high pressure air</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2451" dir="ltr">& oxygen coming through the hull wall, I just have wires.</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2450" dir="ltr"> Unfortunately it looks like they have got it wrong. They have a conical</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2715" dir="ltr">portion at the base of the male thread that makes it impossible to seal</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2716" dir="ltr">with an O-ring. I specified 10mm for thread & shank, but the 3mm extra </div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2766" dir="ltr">on the conical portion means the flat faces of the pressure transmitter & </div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2770" dir="ltr">regulator can't meet. Other than that it looks ideal for potting the wires.</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_3221" dir="ltr"> Any suggestions for a fix on this, other than sending them back?</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_2856" dir="ltr">I could possibly turn the conical portion down & stack washes under the</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_3222" dir="ltr">o-ring. The fit was also a bit sloppy, but so was the original plug that was</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_3246" dir="ltr">in this high pressure port. Not sure if this is normal or not.</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_3247" dir="ltr">See attached photos, thanks.</div><div id="yiv1938343669yui_3_16_0_ym19_1_1482974612554_3248" dir="ltr">Alan</div></div></div></div><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> </div></div></div></div><br clear="none"><div class="yiv1938343669yqt0072243765" id="yiv1938343669yqt75529">_______________________________________________<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"></div><br clear="none"><br clear="none"></div> </div> </div> </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 href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><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></span><br clear="none"></div></blockquote></div></div><br><div class="yqt1901282403" id="yqt46580">_______________________________________________<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 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>