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RE: [PSUBS-MAILIST] Compressable ballast tanks

Title: Message
That's interesting, keeping the VBT close to ambient. The VBT principle I'm familiar with isolates the tank, so it is possible to end up with quite a large pressure differential and I've had email exchanges along the lines of whether it is best to pressurize with air prior to opening the flood valve at depth. Can you elaborate on this setup Hugo?
 
thanks,
 
Alec
-----Original Message-----
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Hugo Marrero
Sent: Tuesday, January 03, 2006 10:08 AM
To: 'personal_submersibles@psubs.org'
Subject: RE: [PSUBS-MAILIST] Compressable ballast tanks

The JSL submersibles use only HP air to adjust the Variable Ballast Tanks, it also has an externally maounted regulator, which keeps the pressure inside the tank close to the ambient pressure. The system is bulletproof and in almost 10 years of working with it I have yet to see it fail.
 
Hugo
 
 
-----Original Message-----
From: Paul Kreemer [mailto:paulkreemer@gmail.com]
Sent: Monday, January 02, 2006 6:36 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Compressable ballast tanks

For sake of thoroughness: it looks like aluminum 80s vary about 6 1/2 lbs full to empty:  http://dive.scubadiving.com/html/200105buoyancycalc_chart.html#tanktable


Happy New Year!
Paul

On 1/2/06, Dan H. <jmachine@adelphia.net> wrote:
Brian,
 
A K sub doesn't not use any pumps.  The standard system is, air from SCUBA tanks displacing ballast water.   Captain George Kittredge is working on a system where he can pump water, or air when surfaced, to change ballast.  The standard K sub does not have this.  My sub ballast is the standard air displacing system.  I don't know what pumps George is using. 
 
The captain is quite the guy.  In his eighties and still actively inventing,
Dan H.



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