<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div><span>Hearing you Ken.</span></div><div><span>Alan</span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> Ken Martindale 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, June 19, 2015 11:19 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] TEST!!!<br> </font> </div> <div class="y_msg_container"><br>TEST!!!<br><br>-----Original Message-----<br>From: Personal_Submersibles [mailto:<a ymailto="mailto:personal_submersibles-bounces@psubs.org" href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>] On Behalf Of via Personal_Submersibles<br>Sent: Thursday, June 18, 2015 4:28 PM<br>To: Personal Submersibles General Discussion<br>Subject: Re: [PSUBS-MAILIST] Over Pressure Valve<br><br>How do you keep water from going back down the valve, and into the sub, if it opens when submerged?<br><br>Keith T<br><br>via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br>>If the pressure differential exceeds the preset cracking pressure, the <br>>valve will open on its own to relieve the excess pressure. If the pressure <br>>differential is less than the cracking pressure, it would have to be <br>>opened manually. If the differential were only slightly greater than <br>>the preset cracking pressure, I suppose opening it manually would open <br>>it wider for more rapid equalization on many types of valves.<br>>Jim<br>> <br>> <br>>In a message dated 6/18/2015 2:40:58 P.M. Central Daylight Time, <br>><a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> writes:<br>><br>> <br>>Jim,<br>> In that case is it necessary to bump the sealed check valve <br>>to make it open?<br>> <br>> <br>>Alec, I guess what I meant to say was if the check valve is left in <br>>an open line to the outside all the time, rather than being isolated by <br>>another valve.<br>> <br>>Brian<br>><br>>--- <a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br>><br>>From: via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>>To: <a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>>Subject: Re: [PSUBS-MAILIST] Idea..?<br>>Date: Thu, 18 Jun 2015 14:53:15 -0400<br>><br>><br>><br>>Brian, it also has to do with cracking pressure. When you surface the <br>>sub might be slightly over pressure but not with enough differential <br>>to open the valve automatically. That's when you open it manually. <br>>That would also equalize pressure if you have negative pressure in the <br>>sub to make it a whole lot easier to open the hatch.<br>>Jim<br>> <br>> <br>>In a message dated 6/18/2015 1:40:32 P.M. Central Daylight Time, <br>><a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> writes:<br>><br>>It is nothing but a T shape sealed by a spring. If internal pressure <br>>builds up, it pushes the spring and the valve opens. So it is a <br>>normally closed valve... but I suppose you could say its "open all the <br>>time" in the sense that anytime pressure builds up, it will open.<br>><br>>On Thu, Jun 18, 2015 at 2:35 PM, Brian Cox via Personal_Submersibles <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>wrote:<br>><br>><br>>Couldn't you, theoretically, have that valve open to the outside all the <br>>time? <br>> <br>>Brian<br>><br>>--- <a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) wrote:<br>><br>>From: Alec Smyth via Personal_Submersibles <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>To: Personal Submersibles General Discussion <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>Subject: Re: [PSUBS-MAILIST] Idea..?<br>>Date: Thu, 18 Jun 2015 12:15:57 -0400<br>><br>><br>><br>> <br>>I think most have an OP valve, and I'd strongly encourage any who <br>>don't to put one in. If you read Kittredge's book, the lack of an OP <br>>valve was the cause of the only K-boat accident so far. Fortunately <br>>nothing happened to him, but Kittredge had a slow cabin air leak during <br>>his dive and upon surfacing blew out the dome when just below the <br>>surface. He was blown out himself with it. The sub sank, and he <br>>proceeded to re-float it without losing beat. I use the OP valve <br>>routinely to equalize pressure so I can open the hatch easily. Just a <br>>little push on the stem does it. One thing about OP valves, they have <br>>to be capable of handling large flow rates. Don't use a little Swagelok check valve or such small thing.<br>><br>><br>>Best,<br>><br>>Alec<br>><br>><br>><br>><br>><br>><br>><br>>On Thu, Jun 18, 2015 at 10:55 AM, Brian Cox via Personal_Submersibles <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>wrote:<br>><br>>Also Alec, I noticed your check valve overpressure valve in the photo <br>>section. That seems like a great solution to the problem! I guess I was <br>>not aware of that, does everybody have one of those?<br>><br>><br>>Brian<br>><br>>--- <a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) wrote:<br>><br>>From: hank pronk via Personal_Submersibles <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>To: Personal Submersibles General Discussion <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>Subject: Re: [PSUBS-MAILIST] Idea..?<br>>Date: Thu, 18 Jun 2015 05:25:30 -0700<br>><br>><br>><br>>personally, I always avoid welding a machined part to the hull. I <br>>weld a flange or nipple to the hull then bolt or thread the machined part to that.<br>> This is my solution to a lack of tooling and expertise.<br>>Hank --------------------------------------------<br>>On Thu, 6/18/15, James Frankland via Personal_Submersibles <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> (mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) > wrote:<br>><br>>Subject: Re: [PSUBS-MAILIST] Idea..?<br>>To: "Personal Submersibles General Discussion" <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>Received: Thursday, June 18, 2015, 4:58 AM<br>><br>>Hi<br>>Alec\Brian, Yes, maybe it would<br>>push in. A flat step would probably be better like you<br>>say. But maybe im over thinking it as usual. Probably<br>>not required. Brian, I used the<br>>5\8ths bar because that's what was specified on the<br>>plans. However, its also convenient for using a 16mm<br>>reamer for the bore. <br>>regardsJames<br>>On 18 June 2015 at 03:04,<br>>Brian Cox via Personal_Submersibles <<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a><br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>wrote:<br>>Oh cool ! Thanks Alec<br>>! I owe you much over the years<br>>! Brian<br>>--- <a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a><br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>)<br>>wrote:<br>><br>>From: Alec Smyth via<br>>Personal_Submersibles <<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a><br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>To: Personal Submersibles General Discussion <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>)<br>>><br>>Subject: Re: [PSUBS-MAILIST] Idea..?<br>>Date: Wed, 17 Jun 2015 16:40:56 -0400<br>><br>>Hi Brian,<br>>I tend to use quite thick<br>>through-hulls because its easier for me to machine the O-ring grooves <br>>into the shaft than into the insert. In my case its just a matter of <br>>the tooling I have on hand. If you have the tooling to put the grooves <br>>in the insert, half an inch is fine for many applications.<br>>Best,<br>><br>>Alec<br>>On<br>>Wed, Jun 17, 2015 at 3:22 PM, Brian Cox via Personal_Submersibles <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a><br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>wrote:<br>>Alec, James, I'm<br>>using mostly 1/2" stainless rod through-out for most all of my hull <br>>penetrations ( for valves and flaps) , I noticed in the example it <br>>was a 5/8" rod, Why such a heavy duty thickness? Was that for a <br>>particular function? Brian<br>><br>>--- <a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a><br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>)<br>>wrote:<br>><br>>From: Alec Smyth via<br>>Personal_Submersibles <<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a><br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>To: Personal Submersibles General Discussion <br>><<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>)<br>>><br>>Subject: Re: [PSUBS-MAILIST] Idea..?<br>>Date: Wed, 17 Jun 2015 14:03:17 -0400<br>><br>>Hi James,<br>>I think<br>>with the taper, this would tend to push in and jam. The idea is neat, <br>>however, and would probably work fine with a step instead of a taper. <br>>On the other hand, does an O ring sealed through-hull ever fail <br>>catastrophically? I've had the odd drip, but that's all I've bad as <br>>I've seen.<br>>Best,<br>>Alec<br>>On<br>>Wed, Jun 17, 2015 at 12:26 PM, James Frankland via <br>>Personal_Submersibles <<a ymailto="mailto:_personal_submersibles@psubs.org_" href="mailto:_personal_submersibles@psubs.org_">_personal_submersibles@psubs.org_</a><br>>(mailto:<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>) ><br>>wrote:<br>>Hi All Seeing as its a<br>>bit quite I thought I would show this idea. Its super simple.... I <br>>have been thinking how you could stop a leaking through hull. <br>>Thinking of K boat type 5\8th through hulls as in the plans. I <br>>believe Scott had a leak when he did his deep test due to a faulty O <br>>ring?<br>><br>>Anyway, here is my idea. It<br>>would take a little bit more machining, but not much. <br>>Machine the 5\8ths bar with a taper on the protruding part and a taper <br>>on the top to help push the bar through.<br>>(I did that on mine anyway). The handle is made with a cam type end.<br>><br>>If you get a<br>>leak, you can pull the handle up. The bar would be pulled up, forcing <br>>the taper to jam into the penetrator, hopefully stopping most of the <br>>leak. I suppose you could even machine a matching taper into the <br>>start of the through hull to match? I suppose the bar could get pushed <br>>through and jam on its own. That's a possibility. Pic attached. Kind <br>>RegardsJames <br>><br>>_______________________________________________<br>><br>>Personal_Submersibles mailing list<br>><br>><a ymailto="mailto:_Personal_Submersibles@psubs.org_" href="mailto:_Personal_Submersibles@psubs.org_">_Personal_Submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a>)<br>><br>><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br>><br>><br>><br>><br>><br>>--089e01183c9e6a94500518ba817f--_______________________________________<br>>_____<br>>___<br>>Personal_Submersibles mailing list<br>><a ymailto="mailto:_Personal_Submersibles@psubs.org_" href="mailto:_Personal_Submersibles@psubs.org_">_Personal_Submersibles@psubs.org_</a> <br>>(mailto:<a ymailto="mailto:Personal_Submersibles@psubs.org" 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