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From: <RDarri@ao*.co*>
Date: Wed, 27 Jan 1999 17:15:44 EST
To: grnbrg@cc*.um*.ca*, Techdiver@aquanaut.com
Subject: Re: Long hose diameter.
In a message dated 99-01-27 13:07:08 EST, you write:

> 
>  I am looking at buying a 7 foot hose as part of a gradual evolution
>  from a standard, PADI approved ( :-) ) recreational setup to a more
>  technical rig based in DIR standards.
>  
>  It was recommended by a tech diving friend (who does _not_ DIR, and is
>  quite happy to not do so) that the hose be 1/2 inch diameter, instead
>  of the standard 3/8.  His complaint with 3/8 is that it is harder to 
>  breath due to the extra turbulence that a long hose adds, and that a
>  1/2 inch hose, with it's larger diameter would have less turbulence.
>  
>  This seems to make sense.
>  
>  Does anyone have any contrary thoughts, and has anyone tried both
>  and have a definitive answer?


well,

I know a few simple facts.  At 120 psi you can push 121 cu ft/min of air
through a nozzle. At 110 psi with a flow rate of 30 cu ft/min you lose a
whopping 2 pounds of pressure at the end of a 50 foot 1/2 inch air line.

I dont think I will worry about my long hose choking me any time soon.

Rob Darrington.
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