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In a message dated 96-09-27 00:45:05 EDT, troppo@te*.co*.au* (troppo)
writes:

> Speaking purely as a wreck diver, SPG's on deco tanks are a waste of time.
You 
> don't have to be a genius to see why, but I will spell it out for the slow 
> ones. 

Please.. Keep the condensending comments to yourself. I'm happy to hear about
different opinions, but flame tactics will only get you burned.
 
>  First, you need to check the contents of your deco tank pre dive, and be 
> near the tank from that point onwards. Any leaks or reductions in pressure 
> will then be blatently obvious to to even the most henious of strokes.
>  
>  All good wreckdivers will have the valve shut off, once the lines have 
> sufficient pressure to prevent water intrusion. Thus there will be no loss
of 
> gas from the original pressure unless: your burst disc fails, or your tank 
> valve fails. Either way, you are no better off if you have a SPG. And as
some 
> of you know, the burst discs should be blocked.

Okay.. So as a wreck diver you don't have an spg. A different application, a
different set of rules. As for having the burst disc blocked, I'm just gonna
try and put that top back on that can of worms.
  
>  If your reg fails when you switch it on, well you either breath using the 
> tank valve, or change regs. There should be at no stage any serious loss of

> gas.

Or just switch to backup gas.. 
  
>  As too waiting for George to tell you how it's done, well he would be the 
> first to admit the right way is always the easy and obvious way, and once 
> seen or described, needs no explanation.

Well, I've seen his video, and he clearly shows how the WKPP rigs their
bottles. Even with an spg, the bottle still looks clean and streamlined.   

>  troppo
>  
>  BTW, if you must use a SPG, you will find they screw straight into the 1st

> stage, so you need no hose at all. Tape replaces an o-ring, not exactly 
> kosher on non tapered threads, but works. Any leak will be minor, and 
> insignificant compared to a blown o-ring. I only recommend it for use on 
> surface regs.

An Spg is such a simple peice of equipment to use, that I would rather use it
than have to guess at what was in the bottle. And if rigged properly, even
with a hose, it can still be streamlined. 

Safe Diving,

ALongtin@ao*.co*

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