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Re: [PSUBS-MAILIST] oxygen use



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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PO Box 53
Weare, NH  03281
603-529-1100
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