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On Fri, 10 Jun 1994 JOHNCREA@de*.co* wrote: > Rich, > > There are essentially 3 tank level points of concern when discussing > redundancy - the tank-valve oring interface, the burst disk, and if the > tanks are manifolded together, then the cross bar and its points of > attachment/seal. > > Failures at any of these points occurs below the valving mechanism, and > failures at the first 2 points is such that turning off a valve will not be > of help in correcting the problem. > [Lotsa very good discussion on isolation valves, etc.] Thanks for the excellent input... This thread began as a discussion about the validity of considering a y-valve on a single cylinder adequate redundancy. I pointed out that the two weaknesses of such a system are the neck valve and the burst disk (and possibly the valves themselves, depending on the design). As you know, my deep reef rig includes independant large capacity cylinders, one with trimix, the other nitrox (the latter equipped with a y-valve). I am in agreement with most of the others who have commented that the neck o-ring is not a major consideration during the dive, so I don't worry too much about it. I've dealt with the burst disk problem in two ways: a "beefier" disk, and replacing the entire assembly with a plug. The latter can only be recommended for very experienced and careful divers who ALWAYS fill their own tanks. Thanks again for the input... Aloha, Rich
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