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Re: [PSUBS-MAILIST] Re: Increasing pressure inside hull
Carsten-Well put. I could not agree more and thanks for the additional information. Regards, Mark Steed
---------- Original Message ----------------------------------
From: MerlinSub@t-online.de (Carsten Standfuss)
Reply-To: personal_submersibles@psubs.org
Date: Fri, 04 Oct 2002 20:01:48 +0200
>Depends on depths and time. To surface without a stage break
>against decomression tickness - means surface slowly but without a stop
>for scuba divers about :
>
>40 Minutes in 20 meters (66 ft)
>17 Minutes in 30 meters (98 ft)
> 6 Minutes in 42 meters (138 ft)
> 4 Minutes in 51 meters (167 ft)
> 3 Minutes in 60 meters (197 ft)
> 2 Minutes in 63-84 meter (207-276 ft)
> 1 Minutes in 87 and deeper.. (286ft -..)
>
>If you stay longer and surface without some stops - there is a great
>posibilty to get diver bends..
>
>The maximum deep divers was (in a chamber) was 650 meter (2135 ft)
>and it needs a month or so to bring them back to normal pressure.
>
>If you stay deeper as 40-50 meter for more than a couple of minutes you
>need a Trimix or heliox air gas mixture..
>
>If you surface to quick - gasbubbles blown out in your blood.
>Open a bottle of champaine to see the effekt..
>
>A ambient sub driver without a dive course is more or less the
>same as diver without a divecourse - just bloody crazy and stupid
>a fucking amateur.. (hard words but maybe save someday a live or two..)
>
>Carsten - progress is great here - will send some pictures within the
>next 2-3 weeks..
>
>jbarlow@bjservices.ca schrieb:
>>
>> Thank you. That makes sense. I was also wondering if anyone knows what
>> the Max pressure the human body is capable on enduring and what sort of
>> effects one can expect.
>>
>> Jay.
>>
>> Thanks,
>>
>> J. Barlow CET
>> Sr. Mechanical Designer
>> BJ Pipeline Inspection
>>
>> Ph (403) 531-5412
>> Fax (403) 236-8740
>> Cell (403) 807-2195
>>
>>
>> "Thijs Struijs"
>> <thijs-struijs@planet.nl> To: <personal_submersibles@psubs.org>
>> Sent by: cc:
>> owner-personal_submersibles Subject: Re: [PSUBS-MAILIST] Re: Increasing pressure inside hull
>> @psubs.org
>>
>>
>> 30/09/2002 02:42 PM
>> Please respond to
>> personal_submersibles
>>
>>
>>
>> Jay,
>>
>> Increasing pressure is done in case of an emergency escape from a sub. In
>> the Busby book page 660 - 665 you can read more about it. It isn't fun. I
>> doubt if you need to increase pressure in case of a leak. I suppose in most
>> cases leaks are limmited to water seaping through seals. In other cases you
>> won't have time to react (crushing viewports, or a pressurehull buckling).
>> So I don't think it is worth while making a safety system like you
>> discribe.
>>
>> Thijs Struijs
>>
>> ----- Original Message -----
>> From: "Coalbunny" <coalbunny@vcn.com>
>> To: <personal_submersibles@psubs.org>
>> Sent: Friday, September 27, 2002 2:28 PM
>> Subject: [PSUBS-MAILIST] Re:
>>
>> > Not silly Jay. It's an idea and all ideas are worth discussing. I
>> > feel, atleast.
>> > Carl
>> >
>> >
>> > jbarlow@bjservices.ca wrote:
>> > >
>> > > This is a thought I had some time ago, and didn't know who to ask if it
>> was
>> > > a silly idea.
>> > >
>> > > What if one built a 1 atmosphere submarine with the ability to increase
>> the
>> > > pressure inside the hull quickly in case of a leak which would then
>> stop
>> > > the leak and give one time to get the leak under control. I realise
>> that
>> > > you would then have to decompress slowly. The hull wouldn't have to be
>> > > designed for internal pressure because it would only be balancing the
>> > > external pressure, but I think that any hull designed for an external
>> > > pressure would be good the same pressure applied internally. I think
>> the
>> > > problem would come from some fittings which are only designed to take
>> > > pressure from one side.
>> > >
>> > > How quickly can the human body take an increase of pressure?
>> > > How high of a pressure can the human body take if the pressurizing
>> medium
>> > > is air?
>> > > What if you had mixed gasses (diving gas) ready to pressurize the boat
>> (in
>> > > the bottle sized for the interior of the boat at Max depth plus some
>> for
>> > > the unknown leak) and thus diving gas was the pressurizing medium?
>> > >
>> > > Is this silly?
>> > >
>> > > Jay.
>> > >
>> > > Thanks,
>> > >
>> > > J. Barlow CET
>> > > Sr. Mechanical Designer
>> > > BJ Pipeline Inspection
>> > >
>> > > Ph (403) 531-5412
>> > > Fax (403) 236-8740
>> > > Cell (403) 807-2195
>> >
>> > --
>> > "I learned this, at least, by my experiment: That if one advances
>> > confidently in the direction of one's dreams, and endeavors to live the
>> > life one has imagined, one will meet with a success unexpected in common
>> > hours." Henry David Thoreau
>> >
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