Cam,

You got it right! The B.C. inflator does cross behind your head, but not the
dry suit inflator. Reason being, if you roll off your right post, you still
have buoyancy control. If both your b.c. and suit inflation were off your
right post (or all off the left... same problem), and say you blew the
O-ring (like I did two days ago) in your long hose (right post) at the
second stage connection, you would be screwed. I had to turn off my right
post knob to stop the significant free-flow of gas to the second stage leak.
I was still able to inflate my B.C. but had to do it orally... not big deal
at all. I still had suit inflation, that's good!

If it had been the left post second stage 0-ring that blew, I would have had
to turn off the left post knob, losing my dry suit inflation, which would be
really necessary if I had to descend to pass through a restriction or to
keep from freezing to death (difficult to decompress from)... that would be
bad! I would have simply disconnected my B.C. inflator and reconnected it to
my dry suit.

Make sense?

As far as having just one SPG, having two is kind of silly. If you have to
turn off one valve, you're turning the dive anyway, but will still have
access to all your gas. Adding a second SPG just adds about three O-rings
that could fail. You're buddy, who is rigged like you, and who breaths at
about the same rate as you, is going to have an SPG. There's your safe
second. Just look at his if you need reassurance. If you extrude a tank neck
O-ring and thus loose access to half your back-gas, believe me, your going
to be exiting, and under a lot of anxiety! Do you really want to know how
little gas you've got? Much less want to take the time to monitor how soon
your going to croak? The odds of your second SPG blowing an O-ring, or
getting tangled, is far greater than the odds of one of your neck O-rings
extruding... you're just playing an odds game. Just keep the odds stacked in
your favor.

Good question! Have fun!

Scott Gudmundsen
Vernal, Utah
________________________________________
----- Original Message -----
From: Cam Banks <cam_banks@ho*.co*>
To: <techdiver@aquanaut.com>
Sent: Tuesday, November 30, 1999 10:25 PM
Subject: DIR reg rigging


> Having just spent several hours re-rigging my doubles regs, I hope I have
it
> right.  I'm sure someone will tell me...
>
> Right Post(the one on the diver's right, with tanks on):
> * long hose primary reg w/clip
> * BC power inflator hose
>
> Left Post:
> * single pressure gauge, with clip for hip d-ring
> * drysuit inflator hose
> * short hose backup reg w/necklace
>
> Hoses and 1st stages so they do not impede access to either tank knob or
> isolator knob.
>
> Question: So, the drysuit inflator hose does not cross behind the head,
> correct?
>
> You'd think that of the many sites somewhere this would be illustrated
> absolutely clearly, but I couldn't find one.  Tried Cobb's, Leonard's,
> Sallot's, WKPP, Halcyon, etcetera.
>
> Someone tell me the reasoning for one pressure gauge only, and it being on
> the left post please?  I guess that:
> * if it doesn't move, you know to check the valve is open
> * if it moves too fast, you know to check the isolator is open
> * if you have to shut off primary, or isolate, you are on your backup reg,
> so it's nice to know pressure for that side while you are aborting the
dive
>
> Thanks.
>
> Cam
>
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