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Hi again,
One of my diving companions is interested in oxygen cleaning his own
diving cylinders, regulator etc. He is considering using 100% oxygen for
deco at 6m or less. He has access to university lab facilities & hence this
is not a 'garage job'. Can anyone give advice on exactly what needs to be done.
Is it simply a matter of complete degreasing with an appropriate solvent (which
one ?) and replacing all rubber base o-rings with silicone based ones or is
there more to it than this ?
"Oxygen & the Diver" talks about nausia & vomiting being a possiblity
on switching to 100% oxygen. Is this a real problem if you want to do deco
stops on O2 ? How do other divers cope with this ?
Using nitrox was my intended way forwards, instead of 100% O2
(see other mail posted), but there are logistical problems with this.
Costs are higher, ie buying premixed nitrox as opposed to 'welding'oxygen.
The cost of an analyser. Nitrox certification costs. The biggest problem
however for nitrox in the UK right now is availability.
There are about 12 sources where I can buy nitrox (unless I plan to
mix it myself...more expense!). The closest to my home in Liverpool is
1 + 1/2 hours drive away in Blackpool.
If I drive there to get a 3 litre deco cylinder filled for a weekend
of diving in a site with no nitrox supply nearby, what do I do for the
2nd/3rd/4th decompression of the trip ?
Do I buy a seperate 3 litre cylinder for every dive I plan to make ?
Decanting a premixed fill from a larger cylinder (more cost) is one
option, but even a 15 litre cylinder filled to 230 bar isn't going to give very
many 'good' fills of a 3 litre cylinder before the pressure drop becomes
significant. I suppose carrying a 'full-size' nitrox cylinder around on each
dive is one option, but not a very attractive one.
For a single deep dive ('mission-oriented diving'), I can see that the
extra trouble might be worth the effort/expense. It is difficult to see how
nitrox could be incorporated into routine deep diving in the 40-55 metre range
to reduce deco stop times though.
Any ideas from all of you who have already been down this train of
thought and are putting thoughts into action ?
Regards, Steve M.
*******************************************************************************
* *
* Dr. S. G. Millard * E-Mail : ec96@li*.ac*.uk*
* *
* Department of Civil Engineering, * Tel : 051 794 5224 (UK)
* University of Liverpool, * 44 51 794 5224 (Intern
* PO Box 147, *
* Liverpool L69 3BX, * Fax : 051 794 5218 (UK)
* UK. * 44 51 795 5218 (Intern
* *
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