[Date Prev][Date Next] [Chronological] [Thread] [Top]

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.

_________________________________________________________________
MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. 
http://join.msn.com/?page=features/virus