I'm a new diver. Need help for solve a dive problem please :)

[smileland]

I have been struggling with my Nitrox problem for 2 hours. I forgot how to solve it. Can somebody help please?

Dive 1- 106 ft on EAN31 Choose the maximum bottom time possible assuming that your is 0.4 cu ft/min, how much gas will the dive require?

Dive 2- 88 ft on EAN33
what is the maximum bottom time possible as per the dive tables if youe surface interval can not exceed 2 hr.
At the above SGCR, how much gas will you need to excecute that dive.

Please show me how to solve it.

Thanks

 

[TSandM]

Well, first off, you need to look at your tables, and not all Nitrox tables are the same. Once you know what the maximum bottom time is (and you get that from the tables) then you use the SAC rate information to calculate gas consumption. .4 cubic feet is the consumption at the SURFACE; you multiply that by the ambient pressure at your depth of 106 feet (I assume you can figure out what that is?) and that gives you the consumption at depth. Multiply that times the maximum allowable time, and that will give you the gas required for the bottom portion of the dive.

The second dive is done exactly the same way, using the tables and accounting for the surface interval.

Which tables are you using?

 

[UntamedSpirit]

wow...your nitrox class looks to be a bit more complicated than mine was. I'd see what pressure group you were at the end of the surface interval, then see your max bottom time. and go with what TS&M said...finding your pressure (ie 30ft is 2atm), and multiplying it by the sac and all. (so 2*.4=.8 cfm at depth)