[PSUBS-MAILIST] bellows add

Mon Oct 6 19:24:28 EDT 2014

In a rescue or recovery scenario with obviously disabled occupants (Thinking hypercapnia, hypoxia, cardiac arrest, etc.)? Get it open no matter what it takes. I'd probably look to loosen a fitting first, but in the absence of anything obvious, drilling a hole in an acrylic viewport takes no time at all.

Sean

On October 6, 2014 4:59:56 PM MDT, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>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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