The reason that they would want to see the calcs 'in reverse' (from
demand to supply)
is so that they can check balancing points - where a branch line is
taken off for example.
This is the way that we used to do calcs, by hand on stone tablets.
At 09:45 AM 3/25/2011, you wrote:
A supply calc (calculating from the point of service to the remote
area) determines the maximum density of water that the sprinklers
can flow given that supply. A demand calc (calculating from the
remote area back to the source) calculates for a specific density
and then tells you what the safety factor is of that supply. We
occasionally use supply calcs for areas we may expect to be modified
to a higher occupancy in the future, or to consult with an owner to
give them an idea of what the maximum storage or occupancy
arrangement for an existing area might be. Generally the demand
calculation from the remote area working back to the supply is the
most common calc though.
Mike Morey, SET
Sprinkler Designer
BMW Constructors, Inc.
O: 317.651.0596 | C: 317.439.2695
www.bmwc.com
<https://owa.bmwc.com/exchweb/bin/redir.asp?URL=http://www.bmwc.com>
________________________________
From: [email protected] on behalf of Anderson, Worth
Sent: Fri 3/25/2011 9:40 AM
To: [email protected]
Subject:
What is the difference when performing hydraulic calculations from
point of service to most remote area, compared to most remote area
to point of service? (NFPA 13 CH 14.4.4.4.5)
Worth Anderson
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Vince Sabolik
Christi Fire Protection, Inc.
11351 Pearl Road
Strongsville, Ohio 44136
T 440 572-7730 F 440 572-7719 Email:
<mailto:[email protected]>[email protected]
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