[PSUBS-MAILIST] Ballast air

Thu Mar 12 12:37:52 EDT 2015

Brian,
The emergency air from the main hp supply is only for smoke from fire, over pressure is moot because your not using it long enough to build up much pressure. You may want to consider also that when you flood the sub you need to add air to speed up equalization.  That air comes from ballast air supply. 
Hank
--------------------------------------------
On Thu, 3/12/15, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Ballast air
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Thursday, March 12, 2015, 11:53 AM

 Hank,
        I just meant the over
 pressure problem.  But one could have a high pressure
 pump to equalize the over pressure problem, if you were
 forced to use your ballast air for life support. 
 Assuming that your regular oxygen was empty and your
 scrubber wasn't working, if you used ballast air you would
 have to keep the pressure at 1 atm.  To do that you
 would have to continually pump out air at depth.  Not
 only would it be hard to do but you wouldn't have enough
 extra air to do it for any length of time.

   Yes I'm going to have plenty of breathing air around,
 like your emergency pony bottle.

 brian

 --- personal_submersibles at psubs.org
 wrote:

 From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
 Subject: Re: [PSUBS-MAILIST] Ballast air
 Date: Thu, 12 Mar 2015 04:22:52 -0700

 Brian,
 I am not sure what you mean about extra air coming in. 
 You could have a small air tank inside also for emergency
 air.  I also have a 6 cuft bail out bottle with
 attached regulator from my previous sub.  Gamma came
 with a real nice set up.  The scuba regulator for
 emergency air is connected right to the main hp manifold
 right beside the pilot.  
 Hank --------------------------------------------
 On Wed, 3/11/15, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

  Subject: Re: [PSUBS-MAILIST] Ballast air
  To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
  Received: Wednesday, March 11, 2015, 11:36 PM

  Good point Hank,  but I'm not
  sure how I would deal with extra regular air coming in.

  Brian

  --- personal_submersibles at psubs.org
  wrote:

  From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
  To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
  Subject: Re: [PSUBS-MAILIST] Ballast air
  Date: Wed, 11 Mar 2015 05:37:11 -0700

  Brian,
  You must be planning to have a separate tank for emergency
  air for breathing, in case of fire etc.
  Hank
  --------------------------------------------
  On Wed, 3/11/15, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
  wrote:

   Subject: [PSUBS-MAILIST] Ballast air
   To: "PSubs" <personal_submersibles at psubs.org>
   Received: Wednesday, March 11, 2015, 2:50 AM

   I'm planning on having
   3 - 300cu ft air cylinders for my ballast supply
 air. 
   I noticed that if I get them filled with nitrogen it
 is
   cheaper than getting breathing or industrial air
   !   That is, until I get my own
   compressor. Brian

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