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Re: [PSUBS-MAILIST] tanks

I agree about the sand, but you don't flood through the pump. A bronze in-line strainer will protect the pump, and another strainer externally on the intake and discharge will help, too. Any debris that gets in there will settle in the soft tanks over time, so don't pull suction directly off the bottom, and if you're diving in dirty water, clean the tanks as part of your annual maintenance. And carry a spare pump in your trip box. It's a $200 insurance policy.
Vance


-----Original Message-----
From: Jim Kocourek <kocpnt@tds.net>
To: personal_submersibles@psubs.org
Sent: Tue, 6 Jan 2009 5:34 am
Subject: Re: [PSUBS-MAILIST] tanks

Hi again david,
 
No a regular bilge pump will DEFINATELY NOT overcome any significant outside pressure.
 
Piston Pumps will do this, but remember that piston pumps are not very tolerant of sand debris etc.
 
 
Best Regards,
 
Jim K
----- Original Message -----
From: David Bartsch
To: personal_submersibles@psubs.org
Sent: Tuesday, January 06, 2009 5:00 AM
Subject: RE: [PSUBS-MAILIST] tanks

Vance,
 
  Would a regular bilge have enough power to overcome the outside sea pressure? Do you need a special type of pump? Is this soft tank pumped at specific depths?
 
                                                                                                            David Bartsch
 


 

To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] tanks
Date: Tue, 6 Jan 2009 05:43:58 -0500
From: vbra676539@aol.com

You pump overboard.
Vance


-----Original Message-----
From: David Bartsch <dbartsch2236@hotmail.com>
To: personal_submersibles@psubs.org
Sent: Tue, 6 Jan 2009 3:44 am
Subject: [PSUBS-MAILIST] tanks


   Frank has me thinking again...
 
  Lets see if I understand this as I should... 
 
  The hard ballast tank is a tank outside of the pressure hull that is subjected to the forces of the outside ambient pressure. To surface, one blasts air into this tank with the vent valves closed. This forces the water down and out thru ballast tank vents allowing the sub to become more bouyant and it bobs to the surface...
 
  Soft tanks are such as buckets within the sub subjected but to cabin pressure and are used to fine tune the bouyancy and for trim adjustments. Water is pumped from one tank to another (If more tha n one is available) to control trim angle.
 
  How does one remove this water from these soft tanks on a small psub?
 
                                                       &nb sp;                                                                   David Bartsch


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