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>If the above DIR configuration is correct - is it not possible to have a
situation >where you're diving in an overhead environment and the left post
gets rolled >off?
Yes. That's why, if you do hit the ceiling, you need to check your knobs.
>In this event, since there is no depressurization of the reg on the left
post the >spg would continue to read a misleadingly high pressure. This
strikes me as a <"bad thing".
Once more, from the top, here goes:
Not a problem. If you check your knobs after any kind of contact, you will
never have this issue. The spg being on the left post actually acts as a
reminder to check for rolloffs. If for some reason, your spg reads the
same thing twice, you need to check the left post a little better. If your
left post is indeed open and your spg isn't moving, then check your
isolator. If your isolator is open, your spg is stuck. Go home and sort it
out to dive another day. If the spg were on the right post, you would have
no SECONDARY indication of a rolloff (your primary indication is, once
again, checking the knob after any kind of contact) until you tried to
breathe the backup. Which would be bad, but better than the alternative of
having the long hose on the left post, which creates two possible serious
problem scenarios:
If you are a "stuffer", and breathe the short hose with the long hose on the
left post, you could then inadvertantly pass off a turned off reg to an OOA
diver, which would make bad things continue to happen. Expect to be
sodomized in the ensuing struggle over the reg in your mouth.
If you are a "stuffer" and breathe the long hose off of the left post or
simply try to route your long hose from the left post in some bastardization
of Doing It Wrong, you will know instantly if your left post rolls off, true
enough. However, back to the air sharing scenario: Your buddy is OOA. You
pass off your long hose, which is connected to the left post. You were
breathing it, so you know it works. All is well. For now. On the way out,
you have a left post rolloff. The first person to realize this is your
hapless buddy, who is already stressed out, and now OOA for the second time.
He now has to signal you and alert you to this problem in order to have air
again, OR, more likely, since this would take some contorting and real clear
thinking from an already stressed buddy, see the first scenario, and once
again, expect to be prison raped in the struggle for your reg.
In DIR, your buddy gets the long hose off the right post. The right
post rolls on, so he won't be cut off. If you donate your long hose, and
you've been neglectful in checking knobs, you will realize this immediately
when you try your backup. You, the less stressed of the two parties, can
now remedy this immediately by turning on your own left post. On the way
out, if your left post rolls off, you will know immediately, and you simply
turn it back on, with little stress to you, and none to your buddy, who may
very well be making one of those "please god, if you let me get out of this
one, I will...." bargains in his head.
S/F,
Duane
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