On 13/03/2018 12:28, Robert Helling wrote:
On 12. Mar 2018, at 15:58, Willem Ferguson
<[email protected]
<mailto:[email protected]>> wrote:
b) Adapting the gas partial pressure graphs to reflect what the diver
breathes during bailout. When rendering the dive by creating a
plot_info structure for each sample, the easiest mechanism of
incorporating bailout would be to use the Shearwater approach: have a
byte indicating Loop or Bailout and perform the appropriate
calculation for gas partial pressures. Alternatively, it may be
possible to reference the linked list of existing events, find the
next bailout event and plot the pO2 depending on the type of bailout
event (i.e. Bailout or OC->Loop). But this would incur significantly
more computational overhead since this lookup will be needed for each
plot_info on the dive profile.
how is a bailout different than a gas change event (except semantics
of “emergency”). Why don’t you insert a gaschange to OC (i.e. with set
point 0)?
Best
Robert
A bailout can be an event where one changes from the loop to open
circuit, but using the same cylinder.
For instance a CCR diver can use the bailout valve to switch from
recycling gas to using the same diluent cylinder but using it in an OC way.
For PSCR, a diver can do the last part of the dive using EAN50, but
recycling the EAN50. However, the last 10-15 m is usually done on OC (no
emergency implied, just because the pO2 drop across the injector valve
becomes very large at shallow depths). So, this PSCR diver switched to
OC without switching cylinders.
So, in the case of rebreathers, bailout does not automatically mean a
change of gas or cylinders.
Hopes this makes sense?
Kind regards,
willem
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