[PSUBS-MAILIST] EBA!!!

Thu Aug 24 06:34:48 EDT 2017

Scott,I have to admit that I have not put so much thought into that scenario.  I think because I (we)  spend so much time and effort installing wiring with fuses and breakers that I have a false sense of security where short circuits are concerned.  I am glad you brought it up and I am sure in the future you will be pointing  out more risk assessments.  We are lucky to have you with us.   What did Pisces VI have originally?Hank

On Wednesday, August 23, 2017, 11:22:46 PM MDT, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

I guess I should mention some other reasons why this unit is worth it
*It has a 3hr breath time 
*It can be hooked up to u/w comms to keep communications with the surface while still breathing safe air
*It is compact (unlike the BioMarine units that a lot of submarines use for their EBAs)
*Fully enclosed mask which makes donning way faster than a reg and mask that most BIBS use
*All parts are professionally built to the KISS standard. (If you have ever dove a KISS rebreather you will know what I mean

Probably one of the most important things I learned at my month at sea with Woods Hole and the DSV Alvin is the importance of actually running realistic drills of emergency situations. This was made bluntly obvious to me when we really started talking about it. For example has anyone on psubs actually done a smoke in cabin drill from operational depth? I think if you do you will be shocked. Trying to don a BIBS and mask, ensure passengers get their BIBS and mask donned, locate the issue, isolate the issue, get the submarine on it's way up, communicate with the surface, on the way up (which is probably at a full blow), slow the accent, vent the cabin from the BIBS at a slow rate so you don't blow a viewport or blow the hatch dogs and flood the submarine at 10 to 30 feet likely drowning everyone. Now that you have done this with a drill add the stress level and I think you will see why it is unacceptable. I know there was a comment on a hour of BIBS usage only brought up the p!
 ressure about 15psi. I would challenge you to do the calcs to see at what pressure a viewport or the hatch fails from internal pressure. I think again you will be shocked. 

I have learned a lot in my career with submarines and I know psubs is committed to safety above all other and I would love to help make it safer. This is the reason why I am pushing this so hard and sharing the discount. If you take nothing else from this e-mail, then I urge everyone to actually run their emergency plans under controlled circumstances then evaluate afterwards and ask, "with the stress level of a real situation, is this a good plan?".

Thank you,
Scott Waters  

>  -------Original Message-------
>  From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
>  To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>  Subject: Re: [PSUBS-MAILIST] EBA!!!
>  Sent: Aug 23 '17 22:43
>  
>  Brian,
>  I am not an expert on rebreathers but
>  in a submarine, could you have a lung with full face mask & 3 hoses
>  attached to it. One hose pushes on to the submarines O2 outlet,
>  & the other 2 to your CO2 scrubber inlet & outlet. Manually control
>  the volume of the lung or set up some sort of bellows add system!
>  In a 1 ton volume submarine you would have over an hour of breathing
>  off a standard regulator & air before you doubled the pressure inside
>  the sub anyway.
>  I am installing ptfe insulated wiring on the inside of my sub to avoid
>  any
>  fires with that, but you can't guarantee what's in all the electronics
>  you
>  put in your sub!
>  Alan
>  
>  Sent from my iPad
>  
>  On 24/08/2017, at 3:11 PM, Brian Hughes via Personal_Submersibles
>  <personal_submersibles at psubs.org> wrote:
>  
>  > My friend Tom Rose's $100.00 USD rebreather. Unfortunately, a few
>  > years ago he died of a heart attack. Tom was a character.
>  >
>  > I've been contemplating making something similar out of a piece of
>  > acrylic pipe, like an old style canister light battery holder, and
>  > an MSA mask. Add a stub for O2 addition. Before I got into this
>  > psubs hobby I use to build DIY mixed gas rebreathers.
>  >
>  >
>  http://web.archive.org/web/20080420110800/http://www.atlimp.com/pend2.htm
>  >
>  > Get Outlook for Android
>  
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>  > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>  
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