[PSUBS-MAILIST] Snorkel

Thu Jan 15 10:08:47 EST 2015

Here you go... taken apart so you can see it better. I haven't done my
preseason cleanup, so there's little bits of surface rust.

On Wed, Jan 14, 2015 at 8:55 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Any pictures ?
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Private via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Snorkel
> Date: Wed, 14 Jan 2015 19:58:57 -0500
>
>
> Pretty much the same as Emile's. I made a disk with lots of holes in it
> and a spring- loaded cap on the outside. A wing nut inside the sub allows
> you to adjust the cracking pressure, and "manual override" means pressing
> on the stem to make the cap on the outside unseat. We're talking just a few
> hours work to make one of these, it's really simple.
>
> For those who might not have Kittredge's book, there's a story in there
> that is relevant. Kittredge had been tooling around for a while on the
> bottom and there was a very slight air leak in the cabin that he was
> unaware of. He was about to break surface when there was a big womp and
> next thing he found himself outside the sub swimming, and the sub on the
> bottom. The K250 dome had blown out and he'd gone through behind it. It was
> his only accident. Bottom line... Always have an OP valve and a means of
> monitoring cabin pressure.
>
> Best,
>
> Alec
>
>
>
> On Jan 14, 2015, at 7:25 PM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alec , what is your over pressure valve?
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Private via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Snorkel
> Date: Wed, 14 Jan 2015 19:02:45 -0500
>
> Hi Sean,
>
> It's extremely easy to relieve negative pressure... You just press the
> plunger and can do it with one finger. I do this almost every time before
> opening the hatch, as a small negative pressure is SOP.
>
> Best,
>
> Alec
>
>
>
> On Jan 14, 2015, at 6:57 PM, Sean T Stevenson via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Is it always possible to manually actuate the valve if you have a negative
> differential pressure?  I always presumed that a ball or needle valve would
> be necessary to equalize pressure on either side of a hatch before opening,
> because such a valve accommodates pressure differences in either
> direction.  With the overpressure valve, in such a situation you need to
> overcome this difference in addition to the spring preload. That, or I
> guess you could just bleed some air or oxygen into the cabin.
>
> Sean
>
>
> On January 14, 2015 12:36:36 PM MST, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Brian,
> I seem to remember you can manually operate Emile's
> overpressure valve; and it is operating procedure to press
> it to relieve the remaining pressure before opening the hatch.
> If you are looking for an off the shelf solution, make sure
> you can do that.
> Alan
>
>   ------------------------------
>  *From:* Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Thursday, January 15, 2015 6:11 AM
> *Subject:* Re: [PSUBS-MAILIST] Snorkel
>
> I don't see where they list the pressure limit on it.
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: James Frankland via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Snorkel
> Date: Wed, 14 Jan 2015 16:31:56 +0000
>
> what about something like this?  I only just googled it so would need
> research.  Don't quote me on it!
>
> http://www.haitima.com.tw/valve/check-valve/check-valve-2026.htm
>
> On 14 January 2015 at 15:55, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
>
> Is there an off the shelf over pressure valve that I can get?
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: James Frankland via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIS! T] Snorkel
> Date: Wed, 14 Jan 2015 13:58:24 +0000
>
> Yes, my OP valve does not have enough holes.  I have a job over the
> winter to add more or drill existing holes bigger.
>
> On 14 January 2015 at 13:04, Emile van Essen via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Mark, All.
>
> Mind the area is big enough. The valve in the attachment is designed for a
> 3000 Kg sub. But even then it is to small if you surface too quick in case
> of massive overpressure.
> Cracking pressure: 25-75 mBar.
>
>
> Best regards, Emile
>
> -----Oorspronkelijk bericht-----
> Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org
> ]
> Namens Mark via Personal_Submersibles
> Verzonden: dinsdag 13 januari 2015 13:12
> Aan: Personal Submersibles General Discussion
> Onderwerp: Re: [PSUBS-MAILIST] Snorkel
>
> Since we are discussing over-pressure valves, can you recommend a make and
> model, or describe its specifications?
>
> Regards,
>
> Mark...
>
> Sent from iPhone.
>
> > On Jan 12, 2015, at 7:06 PM, Pete Niedermayr via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
> >
> > Scott, I see you have an overpressure valve in place of the snorkel .
> Whats that on the other side ?
> >
> > Pete ?
> > --------------------------------------------
> > On Mon, 1/12/15, via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
> >
> > Subject: Re: [PSUBS-MAILIST] Snorkel
> > To: "Personal Submersibles General Discussion"
> <personal_submersibles at psubs.org>
> > Date: Monday, January 12, 2015, 5:09 PM
> >
> > I
> > would recommend a cabin overpressure valve instead. It is a
> > mushroom valve. You can see pics on my sub page. Alec
> > did the same thing.
> >
> > Thanks,
> > Scott Waters
> >
> >
> > -------- Original
> > Message --------
> > Subject: [PSUBS-MAILIST] Snorkel
> > From: Pete Niedermayr via Personal_Submersibles
> > <personal_submersibles at psubs.org>
> > Date: Mon, January 12, 2015 3:58 pm
> > To: personal_submersibles at psubs.org
> >
> > I have a set of K 350 plans that I'm using as a
> > reference for my own design. I'm using the conning tower
> > plans pretty much as per. The question I do have is. Snorkel
> > or no snorkel ? On the one hand I can see how it would be
> > useful have. On the other hand no other design seems to have
> > one. What are your opinions? Snorkel or no snorkel?
> >
> > Pete
> > _______________________________________________
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