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*Clare Gledhill* · June 20th, 2007, 12:44 PM

Quote: (Originally Posted by anders)

Hi,

We want to do a wreck dive to 30m for 45-50 mins.
That implies a deco of about 15-20mins if I'm correct.

The question is:
If we bring 50%, there won't be much gradient at the gasswitch - could we move the extended stop from 21m to 15m to increase gradient?

Or would O2 be a better decogas for this dive?

Best,
Anders

Look at your profile - where do the stops start lengthening. What impact would taking O2 have on your minimum gas requirements? If you take that amount of gas off available will you have sufficent to do your intended bottom time - or will that have to change?

Answering these questions will answer the deco gas question for you.

June 20th, 2007, 12:44 PM	#4 (permalink)
Clare Gledhill(Offline) GUE Instructor Site Admin Join Date: Nov 2005 Location: UK Posts: 1,562	Quote: (Originally Posted by anders) Hi, We want to do a wreck dive to 30m for 45-50 mins. That implies a deco of about 15-20mins if I'm correct. The question is: If we bring 50%, there won't be much gradient at the gasswitch - could we move the extended stop from 21m to 15m to increase gradient? Or would O2 be a better decogas for this dive? Best, Anders Look at your profile - where do the stops start lengthening. What impact would taking O2 have on your minimum gas requirements? If you take that amount of gas off available will you have sufficent to do your intended bottom time - or will that have to change? Answering these questions will answer the deco gas question for you. __________________ Clare . "Keep away from people who try to belittle your ambitions....Small people always do that, but the really great make you feel that you too can become great." Interested in DIR dive training? Always happy to chat/answer questions so get in touch via PM or visit www.dirdiver.co.uk Last edited by Clare Gledhill; June 20th, 2007 at 12:51 PM.