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Re: [PSUBS-MAILIST] question about Diver Lockout.
Hi, I am Michael W.
commercial diver and sub pilot,
we were pressurising the lock out chamber at a given working depth, after
equalizing to ambient pressure, the bottom hatch would open on its own
gravity,divers locking out, after the dive the hatch was closed and with a
pump the pressure in the chamber would be reduced to first decompression
stop or to storrage depth, or to next lock out depth with decompression,
dependibg on excursion limits of dive. Some times the sub would carry on
video work on the bottom, and divers would decompress. The hatch would
allways be a double acting bayonet hatch, (Draeger hatch) with o-rings on
both sides,and with notches both ways. Allways reducing pressure with a pump
and adding pressure from high pressure storrage cylinders. When diving with
heliox, gas can be stored back to high pressure cylinders,after being
scrubbed of co2, with a compressor or pump, as everyone knows a compressor
is a pump. As much as for the safty valve, each chamber must have a safty
valve to prevent over pressurizing by law, and common sence.
Best regards, Michael W.
>From: VBra676539@aol.com
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] question about Diver Lockout.
>Date: Wed, 21 May 2003 08:37:42 -0400
>
>Sorry, that isn't the way it works. You can't vent overboard against
>ambient pressure. If your chamber is pressurized to the bottom hatch and
>you vent at the top of the chamber, you will flood the vehicle. The long
>string of bubbles will be you emitting the last epiphanous shout of
>realization, just before drowning.
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