Re: [PSUBS-MAILIST] Drop weight mechanism

Subject: Re: [PSUBS-MAILIST] Drop weight mechanism

From: "Øystein Skarholm" <skarholm@gmail.com>

Date: Thu, 31 Jan 2008 19:19:02 +0100

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In-reply-to: <EGEKIFGEOFLHNFADCNPCKENICAAA.ojaivalleybeefarm@dslextreme.com>

References: <d1e.1a1963c6.34d33a9f@aol.com> <EGEKIFGEOFLHNFADCNPCKENICAAA.ojaivalleybeefarm@dslextreme.com>

Reply-to: personal_submersibles@psubs.org

Sender: owner-personal_submersibles@psubs.org

On Jan 31, 2008 5:35 PM, Brian Cox <ojaivalleybeefarm@dslextreme.com> wrote:

I think that by the time that O ring fails your hull will be rusting through. If you are concerned you can always periodically replace the O rings every couple of years. I think you are over reacting to the possibility of this type of failure, and you are radially changing your design for not a very good reason. Look at the pressure that hydraulic systems have, 3000 to 4000 psi . Those O rings seem to manage ok. I've heard Carsten on this subject and I think I remember him listing a whole bunch of hull penitrations on Euronaut.

Brian

-----Original Message-----
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Recon1st@aol.com

Sent: Thursday, January 31, 2008 6:52 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Drop weight mechanism

In a message dated 1/30/2008 3:47:28 PM Central Standard Time, ojaivalleybeefarm@dslextreme.com writes:

Are you worried about the O ring failing ?

Brian

Brian yes in a way. To my way of thinking any hole in the pressure hull is a concern for

leaking. It just seems to me that a hand operated hydraulic ram is sufficient to remove

drop weights without relying on an o-ring. Every o-ring will fail, it is just a matter of when.

I also have planned on testing the drop frequently. This seems to be a good practice considering

the importance of this working if needed.

Dean

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