Unix Sage - Gas Management

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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)
		2640					3000	3300		3442
fsw	ft³	80	95	104	108	120	77	80	100	80	100	120	130
30	14	462	389	355	342	308	545	578	462	602	482	402	371
40	16	528	445	406	391	352	623	660	528	688	551	459	424
50	18	594	500	457	440	396	701	742	594	774	620	516	477
60	21	693	584	533	513	462	818	866	693	904	723	602	556
70	23	759	639	584	562	506	896	949	759	990	792	660	609
80	26	858	723	660	636	572	1013	1072	858	1119	895	746	688
90	29	957	806	736	709	638	1130	1196	957	1248	998	832	768
100	32	1056	889	812	782	704	1247	1320	1056	1377	1101	918	847
110	36	1188	1000	914	880	792	1403	1485	1188	1549	1239	1033	953
120	39	1287	1084	990	953	858	1519	1609	1287	1678	1342	1119	1033
130	43	1419	1195	1092	1051	946	1675	1774	1419	1850	1480	1233	1139
140	47	1551	1306	1193	1149	1034	1831	1939	1551	2022	1618	1348	1244
150	52	1716	1445	1320	1271	1144	2026	2145	1716	2237	1790	1492	1377
160	56	1848	1556	1422	1369	1232	2182	2310	1848	2409	1928	1606	1483
170	61	2013	1695	1548	1491	1342	2377	2516	2013	2625	2100	1750	1615
180	65	2145	1806	1650	1589	1430	2532	2681	2145	2797	2237	1864	1721

Created with rock-bottom-calc.pl