Nitrogen load clearing overnight?

[DivemasterDennis]

You can also calculate your residual nitrogen through using, get this, the RDP tables. They are conservative, and you can know when your residual nitrogen has zeroed out. If it hasn't you can limit your NDL time appropriately. It's a skill worth having.
DivemasterDennis

 

[PACKRMAN]

You said you have a B.U.D so you might as well use its reading for your diving after your primary DC failed. just rig a bungee-mount and dive

I agree, its a major reason why I wear one. My primary comp. is AI, so is the "spare". Until recently I felt I could finish the day on my BUD then switch in the morning.

You can also calculate your residual nitrogen through using, get this, the RDP tables. They are conservative, and you can know when your residual nitrogen has zeroed out. If it hasn't you can limit your NDL time appropriately. It's a skill worth having.

My understanding is that you would have to have used the RDP for the entire day. You wouldn't be able to just pick up the tables at say dive #4. Is this not correct?
DivemasterDennis

 

[Diver0001]

You can also calculate your residual nitrogen through using, get this, the RDP tables. They are conservative, and you can know when your residual nitrogen has zeroed out. If it hasn't you can limit your NDL time appropriately. It's a skill worth having.
DivemasterDennis

The deco model on your computer will differ from the model used to calculate the rdp. I guess in theory if you fell back to tables and assumed you were a maxed out Z diver then you could get yourself on the table but you would have to do all subseqent dives during that trip on the tables unless you wanted to put in a 24 pause. Even this i have my doubts about because tables use the 60min compartment for calculating surface intervals and the computer's algorithm assumes a 720 min compartment. It's like two maps of the same area on different scales. You can make them line up at one point but never at all points.

In terms of maximizing bottom time it might also be better to sit out for 24 hours at the beginning of that process and fall back to another computer depending on the amount of diving left to do.

Either way the 24 hours is a factor.

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[NAM001]

Diver0001's plost #6 raises an nteresting point and perhaps he can further explain. My trerminology may not be correct and my example not precise but i think it is sound for purposes of explanation. The 720 min complartment is a compartment that in 720 minutes will change its saturation 50% from the old level to the new level. So on the surface we will call it 0 (inow its actually 1 atm but ) and you go to 100 ft. in 720 minutes your body's 720 minute compartment is at 50 ft. 720 min is 12 hours. So unless you are at 100 ' for 12 hours you will never get to 50% loading for that compartment. so you make 6 dives a day to 100 ft for a total of 100 min at 100 '. you hav not even meaningly started to fill the 720 compartment. The compartment is maybe at 20 ft. If you have been at 100 depending on gas used you have other issues with the faster compartments. Now the 3.5 day thing. that is 7 720 minute periods. So the level of saturation is cut in half 7 times. So 6 dives to 100 probably got you say 20% saturated and you are cutting that in half once for your night time SI and 7 times for the next 3.5 days. Ther is no significant level on the 720 min compartment. Its a non issue for rec divng or non saturation diving. And for grins as long as you move 1/2 the way there each period, you will never get there. 0 to 50 to 75 to 87.5 to 95 to 97.5 percent there but never there. Some statistical people can better explain how half lifes or time constants are consodered there after 5-7 periods. for instance the above numbers were after 5 periods and you are 97.5% there. You may be more concerned with the faster compartments and determining which apply to your dive times and depths for the day and then looking at the effect of the 12 hour SI after. BTW if you started the 3.5 days with the 720 min compartment at 20 it would now be at 1/2 foot. (for sake of argument not precision)

Interesting, thank you for your answers. I had no idea about off gassing for 3.5 days. I think I will do a little experimenting next week along these lines. Definitely food for thought.