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On Tue, 25 Nov 1997, Jon Breazile wrote:
> William M. Smithers Wrote:
> >No thank you - I like my Buhlmann served straight up, water on
> >the side.
>
> Don't you think you should throw in some deep stops, or do you
> consider it ongassing?
Of course it's a good idea to throw in deep stops, but that's
irrelevant - Pyle-style deep stops are applied post-model - meaning
the model is run, deep stops are added, then the model is re-run.
> Tell us what you would do for a 300 ft.
> dive for 25 min for 14/50.
Glad you asked, but it's moot, because since I went closed-circuit, I only
dive Heliox below 150ft, then switch to N2 diluent for deco.
But here's what you get for 300 for 25 on 14/50, with,
then without deep stops, using unadulterated Buhlmann ZHL16c.
This assumes 32%, 50%, and 100% for deco, a 100fpm descent
rate, with an on-the fly switch from 50% to mix at 60ft, and
an ascent rate of 60fpm up to 100, then 30fpm slowing to 10fpm
as you get shallow. In real life, I'd probably skip the 32%,
and calculate the intermediate stops for mix.
DIVE PLAN
Waypoint at 60ft for 0 min on Nitrox 50.0, PPO2 1.408, END 26
Waypoint at 300ft for 25 min on Trimix 14.0/50.0, PPO2 1.411, END 119
Norm Stop at 120ft for 1 min on Nitrox 32.0, PPO2 1.482, END 90
Norm Stop at 110ft for 1 min on Nitrox 32.0, PPO2 1.385, END 90
Norm Stop at 100ft for 1 min on Nitrox 32.0, PPO2 1.288, END 81
Norm Stop at 90ft for 2 min on Nitrox 32.0, PPO2 1.191, END 73
Norm Stop at 80ft for 2 min on Nitrox 32.0, PPO2 1.095, END 64
Norm Stop at 70ft for 3 min on Nitrox 50.0, PPO2 1.559, END 32
Norm Stop at 60ft for 3 min on Nitrox 50.0, PPO2 1.408, END 26
Norm Stop at 50ft for 6 min on Nitrox 50.0, PPO2 1.256, END 20
Norm Stop at 40ft for 7 min on Nitrox 50.0, PPO2 1.105, END 13
Norm Stop at 30ft for 12 min on Nitrox 50.0, PPO2 0.954, END 7
Norm Stop at 20ft for 14 min on 100% Oxygen, PPO2 1.605, END 0
Norm Stop at 10ft for 27 min on 100% Oxygen, PPO2 1.303, END 0
TOTAL DECO TIME: 79 minutes.
DIVE RUN TIME: 115 minutes.
CNS Total: 85.3%
OTU's: 168
42.1Cu ft of 50.0% consumed.
155.7Cu ft of 14.0/50.0 consumed.
14.7Cu ft of 32.0% consumed.
33.0Cu ft of 100.0% consumed.
245.5Cu ft total open circuit gas consumed.
And with 2 minute Pyle-style deep stops:
Waypoint at 60ft for 0 min on Nitrox 50.0, PPO2 1.408, END 26
Waypoint at 300ft for 25 min on Trimix 14.0/50.0, PPO2 1.411, END 119
Deep Stop at 200ft for 2 min on Trimix 14.0/50.0, PPO2 0.987, END 73
Deep Stop at 160ft for 2 min on Trimix 14.0/50.0, PPO2 0.818, END 55
Deep Stop at 130ft for 2 min on Trimix 14.0/50.0, PPO2 0.691, END 41
Norm Stop at 100ft for 1 min on Nitrox 32.0, PPO2 1.288, END 81
Norm Stop at 90ft for 2 min on Nitrox 32.0, PPO2 1.191, END 73
Norm Stop at 80ft for 3 min on Nitrox 32.0, PPO2 1.095, END 64
Norm Stop at 70ft for 3 min on Nitrox 50.0, PPO2 1.559, END 32
Norm Stop at 60ft for 4 min on Nitrox 50.0, PPO2 1.408, END 26
Norm Stop at 50ft for 6 min on Nitrox 50.0, PPO2 1.256, END 20
Norm Stop at 40ft for 9 min on Nitrox 50.0, PPO2 1.105, END 13
Norm Stop at 30ft for 13 min on Nitrox 50.0, PPO2 0.954, END 7
Norm Stop at 20ft for 16 min on 100% Oxygen, PPO2 1.605, END 0
Norm Stop at 10ft for 31 min on 100% Oxygen, PPO2 1.303, END 0
TOTAL DECO TIME: 94 minutes.
DIVE RUN TIME: 129 minutes.
CNS Total: 94.5%
OTU's: 184
47.0Cu ft of 50.0% consumed.
174.5Cu ft of 14.0/50.0 consumed.
12.2Cu ft of 32.0% consumed.
37.0Cu ft of 100.0% consumed.
270.8Cu ft total open circuit gas consumed.
--
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