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> If your reg fails when you switch it on, well you either breath using the > tank valve, or change regs. There should be at no stage any serious loss > of gas. ALongtin replied: Or just switch to backup gas.. ******************************************** We are talking deco gas here. Despite your request to quit the condescending remarks, I have had to again spell it out for the slow ones:) Switch to backup gas? If you really mean that, you must be one of those tech divers who carry 2 of each deco mixes, and end up with 4 deco tanks for a weenie dive that only needs 1. I think this is called paranoid gear dependency. The point is that you can reduce the chance of equipment failure to 1 component; as long as your deco tank valve works, you can get at the gas, one way or the other. This is not as easy for back-mounted gas, which is just another reason not to carry deco gas on your back. As to blocking the burst disc; tanks still explode when fitted with burst discs. Most banks/compressors won't fill more than 350bar, which is the same as having a 360 bar burst disc. I have only ever seen a burst disc function at pressure well below their rating, which is reason enough to get rid of them on life support equipment. If you check the pressure is correct after the fill, there is no added risk of the tank overheating to the point it will fail. Common sense however dictates not to do this on 160bar tanks, where 350 bar is beyond the test pressure. Also, on most of the low pressure tanks I have seen, the burst disc HAS previously failed on the fill, and has been subsequently fitted with a "standard" disc which is meant for the higher pressure (240 bar) tanks. This is the same as blocking the burst disc. troppo
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