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Gas Management
Assumptions:
  • Stressed diver SAC rate 1cf/min
  • 1 min to sort out problem at depth
  • 30ft/min assent rate from depth to 15fsw
  • 3min Saftey stop at 15fsw
Example:
If at 132 feet one diver has a problem starts sharing air:
1 Min to sort out the problem
	((132/32.8)+1)*1=5cf
3.9 Minutes to assend from 132fsw to 15fsw average depth 73.5fsw
	((73.5/32.8)+1)*3.9=12.6cf
3 Min safety stop at 15fsw
	((15/32.8)+1)*3=4.3cf
So one diver needs 5+12.6+4.3=21.9cf
So for two divers to do a safe assent from 132fsw would need 44cf
on a 3000psi 80cf tank the turn pressure would be 1600psi
2100psi if you add 500psi on top

Turn Pressure Chart
Pressure (psi)
Volume (ft3)
2640300033003442
fswft38095104108120778010080100120130
3014462389355342308545578462602482402371
4016528445406391352623660528688551459424
5018594500457440396701742594774620516477
6021693584533513462818866693904723602556
7023759639584562506896949759990792660609
8026858723660636572101310728581119895746688
9029957806736709638113011969571248998832768
10032105688981278270412471320105613771101918847
1103611881000914880792140314851188154912391033953
12039128710849909538581519160912871678134211191033
1304314191195109210519461675177414191850148012331139
14047155113061193114910341831193915512022161813481244
15052171614451320127111442026214517162237179014921377
16056184815561422136912322182231018482409192816061483
17061201316951548149113422377251620132625210017501615
18065214518061650158914302532268121452797223718641721
Created with rock-bottom-calc.pl