Re: [PSUBS-MAILIST] oxygen use

["ALAN JAMES" <alanjames@xtra.co.nz>]

To All,
So does anyone take down 20kg of absorbent per person to give them the 3 day
safety margin advised by ABS ??? I'm trying to build a small sub and don't 
like the
idea of making extra room for all that.
regards Alan

----- Original Message ----- 
From: "Jon Wallace" <jonw@psubs.org>
To: <personal_submersibles@psubs.org>
Sent: Monday, April 27, 2009 10:57 AM
Subject: Re: [PSUBS-MAILIST] oxygen use


> Hi Alan,
>
> I am not aware of any indicator color that you can add to an existing 
> product.  The indicator absorbent is manufactured that way and I don't 
> think it's possible to enable such functionality after the fact.  It is 
> debatable anyway, whether you should rely on the absorbent color indicator 
> as a reliable means to determine when the  chemical is saturated with CO2. 
> There's plenty of opinion out there on the internet both pro and con.  My 
> personal taste is for a CO2 sensor.
>
> In regards to amount of absorbent, yes you've calculated correctly.  Hence 
> the Micropore ExtendAir option.  Though more expensive than sofnolime, it 
> is also likely easier to handle, change, and take up less room.
>
> Jon
>
>
> ALAN JAMES wrote:
> > Thanks Jon, great stuff.
> > You mention using clear canisters and an indicating chemical in the 
> > scrubber design.
> > Is this a separate chemical you can add to the absorbent? I have 20kg of 
> > Sofnalime
> > which is non indicating and would like to change that.
> > Also I calculated that at 1/2 a liter of O2 consumption a scrubber would 
> > last 200 minutes per
> > kg of absorbent.  I seem to remember that ABS recommended 3 days air 
> > supply on a one man sub.
> > Does this mean they expect me to take down 20kg of absorbent?
> > Thanks Alan
>
>
>
>
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