Thats just the problem - the predive checks in this particular instance check out just fine - you breath off your reg and all is well, you fill your bc and all is well - everything checks out quite ok. Its only when the tank pressure gets to a point where it cant refill the 1st stage and hoses fast enough due to the restriction and the fact the tank pressure isnt enough to compensate for that restriction - i would imagine depending on just how much of a 'half-turn on' you actually had. In my case 1400 psi seemed to be that point. In others, who knows what the point of failure would be. The point is, the predive checks already happened and someone slipped in there without me knowing it and changed some part of my setup. I had no clue boat crew would even do that - this was my first charter in that area.
GUE - DIRF is one that has valve drills for both single and doubles depending on what you're diving - and its the one that has brought this more to my attention recently which is why i'm practicing it. I think we even may have done that in our OW course but i dont honesetly remember.
Heres a quote from the BAUE site on single tank valve failure:
(http://www.baue.org/faq/valve_drills.html)
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The most common "failure" on a single tank rig is actually failure to have the valve on in the first place. There are several ways this can happen. The most common is for a diver to turn their gas on, check the pressure, then turn it off again. When they later check their SPG, it reads full, so they jump in. Two or three breaths later ... no gas!! I've also seen well-meaning divemasters accidentally turn people's gas off when they meant to turn it on. In this case, the solution is obvious (besides the even more obvious answer of verifying that your gas is on before jumping in .... ) - turn your valve back on!
In the case of an actual failure (e.g., regulator failure), in a single tank you don't have very many options (unless you have a dual-orifice valve with redundant 1st stages, in which case you treat it nearly the same as doubles). Your only option is to first secure a new gas source. Do not shut down your valve until you have secured a gas source (i.e., from your buddy). Once you have a new source, you simply reach back and shut down your valve. While this is not strictly necessary, the bubbles generated by a regulator/valve failure can cause a great deal of confusion, increasing the stress and task loading in a situation that is already stressful
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Clearly, i'm not the only guy in the world to which that particular situation has happened.
What is this? The fact that this actually happened and would be a prime place where a skill like this would be very beneficial would indicate otherwise and I cant imagine being your student at any level with that kind of attitude. Your assumption that this can't happen with predive checks in place (as it did in my case) is so blind as to be dangerous.
What do you mean non-ratified? by PADI? Please tell me you're kidding. The point is that jumping in and having a valve or air issue should be easily rectified by a simple skill - to deny that is ridiculous. The fact that you cant even think through this one example also shows that since padi didnt teach it it just cant happen i guess. I
steve
GUE - DIRF is one that has valve drills for both single and doubles depending on what you're diving - and its the one that has brought this more to my attention recently which is why i'm practicing it. I think we even may have done that in our OW course but i dont honesetly remember.
Heres a quote from the BAUE site on single tank valve failure:
(http://www.baue.org/faq/valve_drills.html)
>>>
The most common "failure" on a single tank rig is actually failure to have the valve on in the first place. There are several ways this can happen. The most common is for a diver to turn their gas on, check the pressure, then turn it off again. When they later check their SPG, it reads full, so they jump in. Two or three breaths later ... no gas!! I've also seen well-meaning divemasters accidentally turn people's gas off when they meant to turn it on. In this case, the solution is obvious (besides the even more obvious answer of verifying that your gas is on before jumping in .... ) - turn your valve back on!
In the case of an actual failure (e.g., regulator failure), in a single tank you don't have very many options (unless you have a dual-orifice valve with redundant 1st stages, in which case you treat it nearly the same as doubles). Your only option is to first secure a new gas source. Do not shut down your valve until you have secured a gas source (i.e., from your buddy). Once you have a new source, you simply reach back and shut down your valve. While this is not strictly necessary, the bubbles generated by a regulator/valve failure can cause a great deal of confusion, increasing the stress and task loading in a situation that is already stressful
>>>
Clearly, i'm not the only guy in the world to which that particular situation has happened.
What is this? The fact that this actually happened and would be a prime place where a skill like this would be very beneficial would indicate otherwise and I cant imagine being your student at any level with that kind of attitude. Your assumption that this can't happen with predive checks in place (as it did in my case) is so blind as to be dangerous.
What do you mean non-ratified? by PADI? Please tell me you're kidding. The point is that jumping in and having a valve or air issue should be easily rectified by a simple skill - to deny that is ridiculous. The fact that you cant even think through this one example also shows that since padi didnt teach it it just cant happen i guess. I
steve
