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From: Andy Hall <mbhphaa@es*.ee*.ma*.ac*.uk*>
Date: Wed, 22 Nov 1995 12:38:15 GMT
To: techdiver@terra.net
Subject: Independant Tri-mix Bailout

Why do IANTD inist that bottom mix cylinders should be manifolded for
trimix dives ?

What is wrong for example with a 120cf main bottom mix
cylinder with an independant 60cf bailout of bottom mix. This system is
intended for clear surface diving in conjuntion with a 80cf of EAN32 and
25cf of EAN50. The ascent is planned to begin when the main bottom mix 
cylinder has the same amount of air in as the bailout cylinder ( ie half
full) and the bailout capacity was calculated for an ascent from the
maximum local depth 300fsw to the EAN32 MOD with a 50% reserve. (Assumed
ascent rate 33fpm). 

Also what equivalent air depth ( and therefore ppN2 ) do IANTD 
recommend for trimix dives? 
( I know that WWKP are recommendend 130ft EAD and 1.4at pp02).

  
Cheers,

Andy.

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