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Fwd: Re: wet vs dry sprinkler systems

I think Sandy was referring to a DRY PIPE SYSTEM.  The pipes are filled 
with air under pressure instead of water.  When a fire develops, a 
sprinkler opens up and lowers the air pressure, which in turn automatically 
trips a dry-pipe valve to let water into the piping system and to the 
sprinkler head.  This system is used in unheated buildings where the water 
in the pipes would freeze.

I expect that it would be harder to find leaks of air than of water and 
that there is energy needed to keep this system under pressure, thus 
bringing up the life cycle concerns that Sue raises.

I have advised Sandy to look into preaction systems and fire cycle systems 
to lower water use.

Bob Pojasek
Harvard School of Public Health

>Delivered-To: p2tech-outgoing@glc.org
>Delivered-To: p2tech@great-lakes.net
>Date: Mon, 07 May 2001 10:57:47 -0500
>From: Sue Sommerfelt <sue.sommerfelt@uni.edu>
>Organization: Iowa Waste Reduction Center
>X-Mailer: Mozilla 4.75 [en] (Win98; U)
>X-Accept-Language: en
>To: Sandy Rock <srock@pprc.ORG>
>Cc: p2tech@great-lakes.net
>Subject: Re: wet vs dry sprinkler systems
>X-OriginalArrivalTime: 07 May 2001 15:49:59.0581 (UTC) 
>Sender: owner-p2tech@great-lakes.net
>Reply-To: Sue Sommerfelt <sue.sommerfelt@uni.edu>
>List-Name: p2tech
>X-Loop: p2tech
>Dry systems are used for electronics.  The Halon floculant retards the
>fire without shorting out the computers.  P2 --- doubtful - the chemical
>is bound to be more polluting when manufactured.
>Definitely take a Life-cycle-analysis approach!


Dr. Robert B. Pojasek
Pojasek & Associates
PO Box 1333
E. Arlington, MA 02474-0071
(v) 781-641-2422
(f)  617-788-0288