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On 2/5/98 10:06 AM, dpearson@no*.ca* wrote: >OK, I'll bite. > >The absolute pressure at 245 feet is approximately: > > 245/33 + 1 = 8.4ATM > >Assuming an IP of 150PSI, the regulator will stop delivering air somwhere >around: > > 8.4 x 14.7 + 150 = 275PSI > >Assuming linear compression of the gas, and a luxfer Al80, the gas available >in the drop from 1200 to 275PSI is: > > (1200 - 275)/3000 * 77.4 = 23.9cuft > >Given a surface consumption of .7 cuft/min, gas consumption at depth would >be: > > 8.4 x 0.7cuft/min = 5.9cuft/min > >Looks to me to be about 4 minutes. Personally, I would be tempted to add a >safety factor. > >That was fun, I actually got to use my calculator today. > >Cheers >David David - A truly excellent response. Converting the tank volume to 77.4 cu ft -- the true capacity of a standard al80 at 3000 psi -- was a nice touch. Your reward is the engineering joke of the day. Because no one who ends a message with "That was fun, I actually got to use my calculator today" should escape ridicule. Thanks for playing. Best - Bill > An engineering student was walking on campus one day when his friend, another > engineering student, rode up on an incredible shiny new bicycle. > > The first engineer was stunned and asked "Where did you get such a nice bike?" > > The second engineer replied "Well, yesterday I was walking along > minding my own business when a beautiful woman rode up to me on this bike. > She threw the bike to the ground, took off all her clothes and > said 'Take what you want!'" > > The second engineer nodded approvingly, "Good choice, the clothes > probably wouldn't have fit." Best Regards -- Bill -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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