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canucksubmariner · January 18th, 2007, 07:48 PM

Quote: (Originally Posted by JohnKendall)

A couple of things.

The Valve Drill always starts with the Right post. This doesn't mean that in the event of a problem you always go for the right post regardless. The reason we have a standardised Valve drill is so that when you are practicing, both you and your team have a framework to work to, and know what is going on.

In a real failure, you go for the post where you think the issue is. You then breath down/de-pressurise the reg. If the bubbles stop, you got it right, if they don't you go for the isolator and involve your team.

If you just blindly go for the isolator you've not gained anymore feedback, so to get any feedback you've now got to shut another valve.

Most of the time you will get the correct valve on your first go, so in these situations you've saved more gas. If you don't, or if it's a problem that can't be solved by shutting down a reg (Neck Oring, Manifold failure etc) then you need your team anyway, and that's going to take a little more time, so you now shutdown your isolator.

In any situation you should be signalling your team for assistance as soon as you realise you have an issue.

HTH
John

In a real emergency people do what they have trained and practiced. That means that judgement will not overcome repetitive training, thus regardless of the severity of the emergency they will shut the right post first. Gas is life underwater and I for one am not taking the chance to lose anymore than I have to.
Anyway the argument is moot to a skilled and thinking diver, a divers should be able to manipulate the center valve with either hand while also isolating a post with the other. It isn't even as hard as walking and chewing gum.

January 18th, 2007, 07:48 PM	#6 (permalink)
canucksubmariner(Offline) New Member Join Date: Mar 2006 Location: GA Posts: 72	Quote: (Originally Posted by JohnKendall) A couple of things. The Valve Drill always starts with the Right post. This doesn't mean that in the event of a problem you always go for the right post regardless. The reason we have a standardised Valve drill is so that when you are practicing, both you and your team have a framework to work to, and know what is going on. In a real failure, you go for the post where you think the issue is. You then breath down/de-pressurise the reg. If the bubbles stop, you got it right, if they don't you go for the isolator and involve your team. If you just blindly go for the isolator you've not gained anymore feedback, so to get any feedback you've now got to shut another valve. Most of the time you will get the correct valve on your first go, so in these situations you've saved more gas. If you don't, or if it's a problem that can't be solved by shutting down a reg (Neck Oring, Manifold failure etc) then you need your team anyway, and that's going to take a little more time, so you now shutdown your isolator. In any situation you should be signalling your team for assistance as soon as you realise you have an issue. HTH John In a real emergency people do what they have trained and practiced. That means that judgement will not overcome repetitive training, thus regardless of the severity of the emergency they will shut the right post first. Gas is life underwater and I for one am not taking the chance to lose anymore than I have to. Anyway the argument is moot to a skilled and thinking diver, a divers should be able to manipulate the center valve with either hand while also isolating a post with the other. It isn't even as hard as walking and chewing gum. Last edited by canucksubmariner; January 18th, 2007 at 07:51 PM.