Talk to Will Smithers

Bruce

-----Original Message-----
From: Stuart Morrison <divebimbo@li*.fr*.co*.uk*>
To: techdiver@aquanaut.com <techdiver@aquanaut.com>
Date: Monday, April 19, 1999 9:42 AM
Subject: Closed-Circuit Rebreathers


>I'm developing some software for use with closed-circuit rebreathers and I
>was hoping someone out there could double check my mathematics.
>
>The problem is:
>
>CCR's use a constant partial pressure. With a nitrox or heliox rebreather
>it is fairly easy to work out what gas a diver will actually be breathing.
>But if a diver is using trimix as a diluent gas, what is the actual gas mix
>he/she is breathing at a given depth.
>
>For example, a diver plans a 90m (295ft) dive using a diluent gas of TX
>13/45 and constant ppO2 of 1.3bar. Now if this diver ascends to 70m (230ft)
>the rebreather will add oxygen to the diluent in the loop to give a ppO2 of
>1.3bar. Obviously, the actual gas mix being breathed has (approximately)
>16% oxygen in it. But what is the new helium content?
>
>What I really need to know is the actual formula; my software uses one
>method, but being a poor OC diver, I don't have a great deal of experience
>in CC equipment, so I'm not sure if it is correct. I'd appreciate any
>answers.
>
>Regards,
>
>Stuart.
>--
>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
>

--
Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]