[PSUBS-MAILIST] Snorkel
James Frankland via Personal_Submersibles
personal_submersibles at psubs.org
Thu Jan 15 05:04:51 EST 2015
another job I have with the OP valve is to put a rubber knob on the end of
the plunger. The amount of times ive cracked my head on it........
On 15 January 2015 at 01:56, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:
>
> Brian,
> Alec is right on the money, keep track of your pressure. Even with an
> over pressure valve there is pressure pushing on the hatch because the of
> the area of the oring in the valve.
> Hank --------------------------------------------
> On Wed, 1/14/15, Private via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Subject: Re: [PSUBS-MAILIST] Snorkel
> To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
> Received: Wednesday, January 14, 2015, 7:58 PM
>
> 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'soverpressure
> valve; and it is operating procedure to
> pressit to relieve the
> remaining pressure before opening the
> hatch.If you are looking
> for an off the shelf solution, make sureyou 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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> > <1399517720.jpg>
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>
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>
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