[PSUBS-MAILIST] bellows add

[hank pronk via Personal_Submersibles]

Alan,
I am sure they have a system that reacts to high O2 levels etc etc  I think my situation is unique and a bellows add does not makes sense.
Hank-------------------------------------------
On Mon, 10/6/14, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] bellows add
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Monday, October 6, 2014, 6:19 PM
 
 I agree
 Hank,I think
 you should email Phil & warn him:)I have
 thought that if there was an air leak in to the cabin the
 bellows add systemwould stop
 adding O2. They have a manual system integrated into the
 bellows addunit &
 a continual feed of O2 regardless of the belows. They would
 have O2 monitorswith set
 point alarms if the O2 % was too high or low but how they
 would address analarm
 issue I don't know.I like
 Cliff's method of having a set volume flowing in (as per
 DW) & O2 addition generatedby O2
 measurements opening an O2 solenoid valve via a PLC. This is
 similar to arebreather
 & James Cameron's system on the Deepsea
 Challenger.Don't
 get me going on the coffee issue. I buy green beans &
 roast them. Would growthem if we
 had the climate. My side of
 Auckland had power. Hugh lives on the Dark side.Alan
 
     
    From: hank pronk via
 Personal_Submersibles
 <personal_submersibles at psubs.org>
 
 To:
 personal_submersibles at psubs.org 
  Sent: Tuesday, October
 7, 2014 10:07 AM
  Subject:
 [PSUBS-MAILIST] bellows add
   
 
 I have been pondering the idea of a bellows add
 system for Gamma.  I am not sure how the DW deals with
 pressure change due to temperature change.  When I am
 diving Gamma the temperature swing is huge causing a big
 negative pressure inside.  A bellows add system would be
 dumping O2 in like mad.  Does the DW have an automatic O2
 over ride or an automatic air release to compensate. Does
 the pilot manually add air to avoid O2 build up.
 When I surface after a dive without the
 scrubber or O2 feeding in, I have to open my hatch vent
 valve for what seems like forever to equalize the sub to
 open the hatch.  It is getting better with the air temps
 dropping.  I can't wait to go for a dive when it is
 snowing. 
 Hank
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