[PSUBS-MAILIST] Snorkel

Wed Jan 14 20:56:17 EST 2015

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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