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At 12:42 PM 11/01/1996 EST, Chriss Ludin wrote: > We are looking for a compact, lightweight and completely independant > bailout system for use by our diving staff. We'd prefer it to be > smaller than an aluminum D and capable of providing 2 minutes of air > at 130 feet. We'd also like it to be compatible with Sherwoods'SRB > 3900 reg. DIN capability would be even better. > > Anyone got anything? Suggestions appreciated. > > Chriss Ludin > Underwater Archaeology Technician > Parks Canada > > chriss_ludin@pc*.gc*.ca* Umm. Something that only lasts 2 minutes at 130 feet isn't really a bailout system cause there's a very good chance it won't get a hard- breathing diver to the surface without exceeding 30 ft per minute. If one of your divers needs to bail out to the surface from 130 ft on a no deco dive, they'll need to carry at least a 20cu ft pony bottle. Excuse me while I go metric. A reasonable Surface Consumption Rate for dive planning is 15 litres per minute. In an emergency that could increase to 35 lpm. I planned for an emergency SCR of 25 lpm which, at 130 ft (40m or 5 ata) would be 125 lpm. Ascent will take 4 minutes and require approximately 260 litres of air. Give your divers a margin of 2 minutes to get their act together before they ascend and add a little more for a safety stop, and the requirement is 520 litres. So your divers would need to sling a 2.6 litre (water capacity) pony pumped to 200bar or, in crude imperial, a 20cu ft pony filled to 3,000 psi. These little 20cu ft aluminium ponies are readily available and take a standard DIN or yoke valve. We use them in Oz for 02 deco. If we can get them here you must be able to get something similar there. If you would like to know manufacturer etc, let me know. rgrds billyW
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