Quote:
| Originally Posted by Gareth J Ant
I agree that more often it's a regulator problem causing a shutdown. With an isolator it is normally open 1/4 of a turn. To shut down takes a fraction of time. With a cylinder valve it is normally fullyopen, this takes a reasonable time to shutdown.
If you have a catastrophic first stage failure, you can empty a 12l cylinder through a firststage in a remarkably short time.
The usual procedure is to shut the isolator prior to shutting off the cylinder, This way you shut off the escaping gas much faster than by just shutting off the cylinder. If the isolator is not fitted to the manifold there is a very high risk that you will have run out of gas totally by the time that the cylinder is shut down.
This is why, generally speaking, thos doing deep dives either dive independents or with isolated manifolds.
Gareth |
Not everybody dives with the isolator only open a 1/4 of a turn or even shuts the isolator first even if they have one
Anyway, don't get me wrong - I am not advocating not diving with an isolator, just that your reasoning is not entirely correct
You could even argue that having the isolator adds another failure point
Cheers, ant