I was not referring to the pressure vessel it self......thats the simple part.....I'm talking about the gas mixing...the deco rates....and all the complications in that regard.
It is really queer but in fact deco in a chamber is a mutch simpler operation then deco in open watter , simply because a diver in a chamber has time.
Assuming the diver is saturated at a given depth/pressure the deco rate is 1 meter per hour up to 10m and then one meter per 90 minutes for any gas breather during the underwater stay.
mixed gas diving is of course something complicated but as for submarines many amateurs are diving trimix and nitrox with very small means.
....its a big part of why we build submersibles in the first place and that is to simplify going deep? Is it not.
It is clear that using one atm sub prevent the diver from any form of decompression sickness and make it possible to get mutch depper then any diver.
But a sub can also be used has a small underwater habitat to allow divers to stay a few days underwater before performing a safe deco ,
It is of course a different goal but the spirit is the same going underwater to meet nature .
regards
jean mi
irox <irox@ix.netcom.com> wrote:
From a structural point of view a decompression chamber is much simpler than a submarine.
The factor for dealing with internal pressure pressure-vessels are lot more forgiving than
the factors when dealing with external pressure pressure-vessels.
Ian.
-----Original Message-----
From: Dave Banks
Sent: May 13, 2005 10:18 AM
To:
personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Fiberglass submersibles inquiry
Careful Emily
Your talking about a decompression chamber and its a very complicated thing. Not to be even thought of by any one but professionals. Submarines are much simpler.....djb
Emile van Essen <2stroke@hetnet.nl> wrote:
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FAMILY: Verdana}TD { FONT-SIZE: 12px; MARGIN: 0px; FONT-FAMILY: Verdana}P { FONT-SIZE: 12px; MARGIN: 0px; FONT-FAMILY: Verdana}.bgtabl { BACKGROUND-REPEAT: no-repeat}
I have personnaly dived in a 40 sits tourism sub-marine in monaco , the sub hull was totaly made in a transparent resin (very thick), so i see no reason why a sub could not be made in a plastic material.
---it is probably cast acrylic. As far as I know exists no clear resin.
On the other hand i
could note that this kind of building requires bigger means than the traditional stell hulls, it cant' be done in a small garage, requires big moults , amtmosphere control (humidity and temperature).
Steel or GRP; I think the same workshop space is required. but you dont wake up the neighburs with the angle grinder.
Personnaly i am really interrested in the result cause i would like to built an un motorized sub five meter lo! ng designed to welcome divers for 4
days with the possibility to reduce the pressure up to surface pressure at the end of stay.
--Do you have a drawing?(post to moki) what hull diameter. It schould have some comfort for a long deco stay.
or maybe am I a stupid newbie dreamer that has nothing to do here ??????
--No
regards, Emile
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