RE: [PSUBS-MAILIST] MBT Vents

["James Frankland" <james@guernseysubmarine.com>]

Hi Alec,

Ive seen this arrangement on your project page.  http://www.psubs.org/projects/1234567810/snoopyk250/

I thought it looked a little odd.  Is there no seal at all for the shaft?

>From peoples advice, i'll just do it as per Georges plans.

Also, you mentioned about the ball valves.  I managed to get exactly the valves called for on the plans.  If you like i can put you in touch with the company i got them from, but i suspect you'll use somethig closer to home.

http://www.guernseysubmarine.com/index_files/Page13993.htm

Kind regards
James


----- Original Message -----
From: Smyth, Alec [mailto:Alec.Smyth@compuware.com]
To: personal_submersibles@psubs.org
Sent: Thu, 4 Mar 2010 11:37:37 -0500
Subject: RE: [PSUBS-MAILIST] MBT Vents

On the regular K design the valve is screwed to the coning tower from
the inside and simply has a layer of sealant between the valve body and
the tower wall. No O-rings or anything. I've had issues with this
arrangement leaking, and on the new boat I've put in a proper SS
through-hull for the stem, which is sealed with an O-ring plus a backup.
However, I will say even when the K version leaks it's an irritant
rather than a danger. In my experience these leaks have taken the form
of a "weep" or slow drip, not anything that could actually flood the
boat in any meaningful way.


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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of
ShellyDalg@aol.com
Sent: Thursday, March 04, 2010 11:17 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] MBT Vents


How is the valve handle sealed at the point where it penetrates the hull
? I've seen both configurations but couldn't see how the handle
penetration is sealed.
Frank D.