Re: [PSUBS-MAILIST] Hard ballast inside P. hull

[Jon Wallace <jonw@psubs.org>]

The K-250 uses an internal hard ballast tank but as Hugh pointed out 
space inside the cabin is usually limited and internal ballast tanks can 
consume a lot of valuable space.  There is the additional concern of 
introducing a point of failure into the cabin that could prove deadly if 
a leak occurs via either a valve, gauge or the tank itself.  Located on 
the outside such a problem can be corrected by dropping the emergency 
weight, but if located on the inside you run the risk of cabin flooding 
and sinking the sub.

Jon


On 2/29/2012 1:24 PM, ojaivalleybeefarm @dslextreme.com wrote:
> Hi,
>                I'm thinking of having my hard ballast located inside 
> my pressure hull and controlling it's contents with air pressure.  So 
> I guess it will have to be rated equal to my pressure hull.  One 
> reason for doing this is simply for logistics as far as how my sub is 
> laid out and how I have to locate things.  I could change this in the 
> future to have the hard ballast outside if I can find a good place for 
> it..
>   I was toying around with the idea of having fore and aft trim tanks 
> using hydraulic fluid as the medium for transferring weight fore and 
> aft.  That way I wouldn't have to worry about corrosion in the pump, 
> even though the oil would not have the weight of water.
>   Is locating a hard ballast inside the pressure hull a common thing 
> to do?
> Hugh, any thoughts?
> Brian




************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 53
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************