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In regards to the message from Dr. S.G. Millard: >I think the 'Genesis' manifold is unique in allowing two regulators >to befitted to a twinset so that either regulator can access the air >in both cylinders. In the event of a regulator free-flowing, it can >be closed off but the other regulator can still access the air in both >cylinders. > >Am I right in thinking that only the 'Genesis' manifold offers >the redundancy described ? No, it is not the only manifold that does this. Yes, it offers the described redundancy. >Any signs of Sherwood manufacturing a M16 option ? I do not know. >How easy is it in practise to shut off a free-flowing regulator and >open up the cross-over valve ? It requires practice. Using one hand to grab the bottom of the tanks and lift them up while using the other hand to close the required valve is the most typical procedure. However, you do not need to work two valves. The cross over valve is typically left in the open position. Therefore, one only needs to close the valve that the offending regulator is attached to. The only cases where you need to close the cross-over valve is when the O-ring between a tank and the manifold extrudes and starts leaking or when the mainfold fails in some manor and you need to isolate half of it. >I also imagine a fair amount of mental effort (at depth) would go into >working out which way to turn each valve. Is this a real problem..or >trivial with practise ? Which way to turn the valve does not end up being hard to figure out, if you left your valves all the way open and a 1/4 turn back. If it only turns 1/4, you went the wrong way. The hard part, I imagine (not having had to do this myself, for real) could be identifying which valve to turn off. If, for example, I saw my SPG blow off and drift to the bottom, it would be straight forward. However, if I just heard a bunch of bubbles behind my head it would be a more complicated task. In either case one would also need to figuring out if the 2nd stage in use was attached to the valve being turned off. These are some of the scenarios used by those making arguements supporting the use of independent tanks. Just some food for thought... tnt
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