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Chris,
Been there.
I would strongly recommend against the partial opening bit.  It does not
take very long to completely close a fully open valve and sitting there
with a valve that's half open trying to figure out which way is
clockwise, behind your back, in an emergency, is a true CF.
If you don't fill your own tanks, try taking a full tank and open the
valves all the way.  It takes several minutes to completely empty.  3 or
4 turns of a knob takes 10 seconds max.  Its a no brainer.
The main caution is to make sure that when your manifold valve is open,
it is lightly open, not tightly open.
Wendell G

> Chris Tibble wrote:
> 
> Just a quickie. I'm just about to buy my first twinset with a
> manifold. I've dived twins before, independents because of fiscal
> reasons (I'm a poor student!) What I need to know is this. Some of the
> people I have talked to who dive manis only open their iso knob about
> 1/2 a turn, whilst others open it all the way. Thinking about it I can
> see advantages and disadvantages to both:
> 
> All the way
> Adv:         No risk of turning wrong way
> 
> Disadv:     May get stuck if turned on all way
>                 Have to turn it 3 turns (or whatever)
> 
> Part way
> Adv:        V fast way of isolating
> 
> Disadv:    Can turn it the wrong way
>                Not having it open all the way may limit equalisation
> across the manifold.
> 
> Now any or all of this may be unmitigated rubbish, but it's just what
> I was thinking about last night.
> 
> Any comments/suggestions as to how best to do it?
> 
> As this is my first post, go easy on me - I'm still learning!
> 
> Many thanks,
> 
> Chris
> 
> 
> --
> It takes a big man to cry, but it takes a bigger man to laugh at that
> man.
--
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