Quote:
| Originally Posted by tiewrapdiver Hi guys,
I'm teaching the oxygen and human phsyiology lecture and i'm a little confused with tracking the UPTD's.
It says that the UPTD's dont clear until the end of the dive period and a 24hr break, and that the maximum allowed is 300 in any 24hr period.
Does this mean that UPTD's for a dive will clear after 24hrs or that will they still count until all diving has stopped for 24hrs?
Thanks,
Tim |
They are considered to accumilate for the entire mission.
The REPEX table (printed in the BA-AC adv diver book) gives a sliding scale, i.e. the shoter the mission, then more are allowed on a daily basis.
From memory it's about 850 for a single exposure going down to 300/day by the time you get to 10 or 11 days.
I tend to demonstrate that with a fairly agressive
sport diving week, say 2 to 3 dives /day for 6 days at Scapa then it'd still be hard to get close to the limits if you stick to the ADV EANx guidlines - (1.4 or 1.44 max pO2).
WRT the 24 hour clearing - one recommendation is to take a 1 day break every 3 or so days, the implication is that the mission still continues, so I would say that, no, a 24 hour break does not reset the utdp counter.
hth
Paul