<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Jon. Depending on depth rating that volume could be a lot. To me it feels safer to oil fill. An air compensated pod would be dangerous if it lost its air. I guess you could increase the size of your drop weight to compensate for flooded pods. I wonder what the effect on buoyancy would be with added air volume weight. I guess the air is leaving one tank to go in another so might balance out<div>Hank<br><br><div id="AppleMailSignature" dir="ltr">Sent from my iPhone</div><div dir="ltr"><br>On May 26, 2019, at 7:00 AM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div style="font-family:Arial, sans-serif; font-size:10pt;"><font size="2">Is is possible to get a very sensitive hydrogen sensor?</font><div><font size="2"><br></font></div><div><font size="2">Brian</font></div><div><font size="2"><br></font></div><div><font size="2"><br></font><br><span style="font-size: 10pt;">--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:</span><br><br><span style="font-size: 10pt;">From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span><br><span style="font-size: 10pt;">To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span><br><span style="font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] Air comp battery compartment</span><br><span style="font-size: 10pt;">Date: Mon, 27 May 2019 01:46:33 +1200</span><br><br><div style="font-size: 10pt;"></div><div style="font-size: 10pt;">AGMs are hard to compensate because they need 1-6psi internal</div><div style="font-size: 10pt;">pressure to re-absorb their gasses. </div><div style="font-size: 10pt;">I had them in my ambient & used two one way 3psi cracking pressure</div><div style="font-size: 10pt;">valves ( one letting air in, one letting pressure out) to maintain at least</div><div style="font-size: 10pt;">3psi inside their housing.</div><div style="font-size: 10pt;">I also used pure silicone oil to limit the volume of air needed. Cheap </div><div style="font-size: 10pt;">Scented silicone oil caused them to off gas. BTW they lasted for years.</div><div style="font-size: 10pt;">Alan</div><div style="font-size: 10pt;"><br></div><div style="font-size: 10pt;"><br>On 26/05/2019, at 11:34 PM, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote style="font-size: 10pt;"><div><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div><span>This was my understanding also, that AGMs don't vent under use. Charging, yes, but the box could be opened or vented during charging. I wouldn't be using regular wet-cell in this application.</span></div><div><span><br></span></div><div><span>Hank, if the enclosure is designed to have limited tolerance to the dimensions of the batteries the air volume would be within reason I think. I suspect .25 cu ft or less.</span></div><div><br><br></div><div style="display: block;"> <div style="font-family: times new roman, new york, times, serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <font size="2" face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, May 25, 2019 10:18 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Air comp battery compartment<br> </font> </div> <div><br><div><div><div style="font-family:Arial, sans-serif;font-size:10pt;"><font size="2" style=""><font face="Arial, sans-serif">If you could use AGM batteries there would not be the explosion issue.</font></font><div><font face="Arial, sans-serif" size="2"><br></font></div><div><font face="Arial, sans-serif" size="2">Brian</font></div><div><font face="Arial, sans-serif" size="2"><br></font></div><div><font face="Arial, sans-serif" size="2"><br></font></div></div></div></div><br></div> </div> </div> </div></div></div></blockquote><blockquote style="font-size: 10pt;"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote><span style="font-size: 10pt;">_______________________________________________
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