Re: [PSUBS-MAILIST] car-deep cycle

[Al Secor <wreckdiver@usadatanet.net>]

Hugo,

I fully agree with you that you should not depend on a lung powered scrubber
except for in a dire emergency such as total loss of battery power, etc.  I
was just trying to point out that they could be constructed fairly easily if
you wanted one for such a backup purpose without having to spend $2000.  I
also agree with the warnings....rebreathers can kill with no
warning...hypoxia is a sneaky animal with little to no warning and has
killed a fair number of rebreather divers.  While some will argue that
hypercapnia provides some warning you certainly don't want to bet your life
on it!  Then there are problems with flooded loops and caustic cocktails
which I would pray we would not have to worry about in a psub unless you
were bailing out and then you certainly would not want to do it on an O2
rebreather.  I think it is also imperative that we learn from the JSL
tragedy and remember that scrubber efficiency is affected by temperature and
to always be prepared for any possible problems.

Al Secor  ARS: WA3PWX  Scuba Instructor SSI PDIC TDI
http://www.geocities.com/SubDiverI
----- Original Message ----- 
From: "Hugo Marrero" <HMarrero@hboi.edu>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, April 20, 2005 5:15 PM
Subject: Re: [PSUBS-MAILIST] car-deep cycle


>
> Here's a low end Lung Powered Scrubber for a diving bell (which can be
used
> in a manned sub):
>
> http://www.amronintl.com/diving/products.cfm?id=298
>
> Please note the vendor's note on the the purpose of the unit:
>
> Begin Quote
>
> "The Model ER-216-000 ensures the scrubbing of carbon dioxide in gases
> breathed by personnel in a confined environment in the event of the loss
of
> the normal ventilation or regeneration system."
>
> End Quote
>
> A lung powered scrubber is not intended as a replacement of the scrubber
> system. It is designed as an emergency device.
>
> This brings us back to my first post. A sound scrubber design should
account
> for sufficient electrical power to run for the designed mission time plus
72
> hours. I am not picking on you Al, but in my opinion, dependency on a lung
> powered scrubber to save on the cost of batteries is not a sound approach.
>
> While building submersibles and operating them is not rocket science, it
is
> not a walk in the park either. If there is something to learn from the
> deaths of the two people aboard the JSL in the 70's is that diving
> submarines is most dangerous when people assume that nothing will go wrong
> and take unnecessary risks.
>
> Respectfully,
>
> Hugo
>
>


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