[PSUBS-MAILIST] Snorkel

Thu Jan 15 12:56:04 EST 2015

Always good to have vulnerable parts protected.

I have my OPV  and penplates on top of the hull under the deck. Having those
above the surfaced WL is another advantage.

At the OPV of my sub is a hand knob to equalize pressure from the outside (
In case there is a vacuum inside due to a temperature drop)

Any Scuba divers around should not know about this knob as the can make your
dive a wet one.

Emile

  _____  

Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
Namens James Frankland via Personal_Submersibles
Verzonden: donderdag 15 januari 2015 17:02
Aan: Personal Submersibles General Discussion
Onderwerp: Re: [PSUBS-MAILIST] Snorkel

Hi Alec,

What size are the holes?  

Something else that worries me slightly with these sort of valves is that
its just possible for the mushroom top to get knocked off, particularly
where I have mine.  Unlikely I know, but would be nice to have a protection
bar of some sort, or even better, a stop valve on the inside.

Anyway, a modification for another day that one.
James

On 15 January 2015 at 15:19, Brian Cox via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

Thanks Alec,  What pressure does the spring hold?

Brian

--- personal_submersibles at psubs.org wrote:

From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Snorkel
Date: Thu, 15 Jan 2015 10:08:47 -0500

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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