[PSUBS-MAILIST] bellows add

Mon Oct 6 18:59:56 EDT 2014

A point that I have been pondering is that DW's pull a vacuum and I plan to
pull a vacuum as is also possible with any other system.  My question is in
the event of an emergency where the Sub is on the surface or brought to the
surface with an unconscious bod inside and a vacuum, then what methods are
available to get air back inside to allow surface support to get the hatch
to open.  With a vacuum then it would be almost impossible to open the hatch
against the vacuum.  Positive pressure is not a problem as a relief valve
will compensate automatically.  If the relief valve is easily accessible
then it can be unscrewed.  What others are being used?   Hugh

-----Original Message-----
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of hank pronk via Personal_Submersibles
Sent: Tuesday, 7 October 2014 11:27 a.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] bellows add

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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