<div dir="auto">That vent valve arrangement was rejected for two reasons I would imagine:<div dir="auto">1- This arrangement wouldn't meet the requirements for stop valves on through hull pipes. Openings to external seawater require two shutoff devices. That's why the cabin flood valve in the k350 plans has a valve AND a threaded pipe cap on the inside. That detail gets skipped alot.<br>2- How would you install, leak test, or do regular maintenance, inspection, or repairs on that valve? The inspectors are big on that, and I doubt they would have accepted "angle grinder" as an answer.</div><div dir="auto"><br><div data-smartmail="gmail_signature" dir="auto">River J Dolfi<br><a href="mailto:Rdolfi7@gmail.com">Rdolfi7@gmail.com</a> <br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 10, 2021, 10:26 via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Personal_Submersibles mailing list submissions to<br>
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Today's Topics:<br>
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1. Re: Original MBT vent? (Jon Wallace via Personal_Submersibles)<br>
2. Re: K-sub hatch o-ring (James Frankland via Personal_Submersibles)<br>
3. Re: K-sub hatch o-ring (Jon Wallace via Personal_Submersibles)<br>
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Message: 1<br>
Date: Thu, 10 Jun 2021 01:07:28 +0000 (UTC)<br>
From: Jon Wallace via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] Original MBT vent?<br>
Message-ID: <<a href="mailto:2023876947.5627052.1623287248264@mail.yahoo.com" target="_blank" rel="noreferrer">2023876947.5627052.1623287248264@mail.yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Good to know.? Thanks Rick.<br>
On Wednesday, June 9, 2021, 08:54:13 PM EDT, Rick Patton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote: <br>
<br>
JonDan Hycroft has been my mentor while building my sub as the captain I think got tired of my calling him for clarification on things due to the plans lacking in various places. I would try him as he is a wealth of information. I stay in touch with him so let me know if you need his number.Rick?<br>
<br>
Sent from my iPhone<br>
<br>
On Jun 9, 2021, at 10:01 AM, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
<br>
<br>
?I found this K-600 drawing (see attached image) of MBT vent valve dated March 23, 1976.? Rejected I suspect because it brought a water source into the cabin and offered multiple leak points.? The date listed on the drawing is interesting because even going back to the MK-III vessel which predates VAST, I'm seeing the traditional MBT vent valve outside the conning tower with just the valve stem protruding inside.? Was this something he considered an improvement that was rejected by the Norwegians?? Did it vent faster?? George, you left us with many questions.<br>
Jon<mbt-vent.jpg>_______________________________________________<br>
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Message: 2<br>
Date: Thu, 10 Jun 2021 14:53:02 +0100<br>
From: James Frankland via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] K-sub hatch o-ring<br>
Message-ID:<br>
<CAHpB=<a href="mailto:UDSDF4Oh-xDbE3ZPJNg020Nt51uM9G8QUrmVv6Pse9skw@mail.gmail.com" target="_blank" rel="noreferrer">UDSDF4Oh-xDbE3ZPJNg020Nt51uM9G8QUrmVv6Pse9skw@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Hi Jon,<br>
<br>
Do you have the info you need on the K-350 hatch dimentions? I can<br>
measure mine this weekend if required, i just missed the email threads on<br>
this one, but happy to assist with any requests if need be.<br>
<br>
Regards<br>
James<br>
<br>
<br>
<br>
On Thu, 10 Jun 2021 at 01:53, Rick Patton via Personal_Submersibles <<br>
<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
> Jon<br>
> I?ll be home in a couple of hours and I?ll let you know.<br>
><br>
> Rick<br>
><br>
> Sent from my iPhone<br>
><br>
> On Jun 9, 2021, at 9:21 AM, Jon Wallace via Personal_Submersibles <<br>
> <a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:<br>
><br>
> ?<br>
> Can someone with a K-350 measure the ID of the hatch o-ring channel and<br>
> report back on it? The K350 plans specify a 2-471 O-ring which has an ID<br>
> of 21.995 inches but I'm measuring an ID of 23.25 on the K600 and I'm<br>
> thinking the K350 also has an ID of 23.25. That would seem like a bit of a<br>
> "stretch" installing the 2-471.<br>
><br>
> There's a 2-472 O-ring that has an ID of 22.995 inches which would require<br>
> less stretching, but...???<br>
><br>
> Will post on FB as well.<br>
><br>
> Jon<br>
><br>
><br>
> _______________________________________________<br>
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Message: 3<br>
Date: Thu, 10 Jun 2021 14:25:04 +0000 (UTC)<br>
From: Jon Wallace via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] K-sub hatch o-ring<br>
Message-ID: <<a href="mailto:175087416.5795478.1623335104434@mail.yahoo.com" target="_blank" rel="noreferrer">175087416.5795478.1623335104434@mail.yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
James, if you can measure it please do.? I've only got the numbers that I calculated from drawings.? Also interested in size of the o-ring, diameter/thickness.? Did you purchase one or did you make your own???<br>
Jon<br>
<br>
<br>
On Thursday, June 10, 2021, 09:54:54 AM EDT, James Frankland via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote: <br>
<br>
Hi Jon,<br>
<br>
Do you have the info you need on the K-350 hatch dimentions?? ?I can measure mine this weekend if required, i just missed the email threads on this one, but happy to assist with any requests if need be.<br>
RegardsJames<br>
<br>
<br>
<br>
On Thu, 10 Jun 2021 at 01:53, Rick Patton via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
JonI?ll be home in a couple of hours and I?ll let you know.<br>
Rick?<br>
<br>
Sent from my iPhone<br>
<br>
On Jun 9, 2021, at 9:21 AM, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
<br>
<br>
?Can someone with a K-350 measure the ID of the hatch o-ring channel and report back on it?? The K350 plans specify a 2-471 O-ring which has an ID of 21.995 inches but I'm measuring an ID of 23.25 on the K600 and I'm thinking the K350 also has an ID of 23.25.? That would seem like a bit of a "stretch" installing the 2-471.<br>
There's a 2-472 O-ring that has an ID of 22.995 inches which would require less stretching, but...???<br>
Will post on FB as well.<br>
Jon<br>
<br>
_______________________________________________<br>
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End of Personal_Submersibles Digest, Vol 96, Issue 10<br>
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</blockquote></div>