What would be reasons to use a hydraulic design point other than the lowest flow rate just over 1,500 sqft of remote area?
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4 Comments
Dan Wilder
12/17/2020 08:10:44 am
To start, it helps to understand where the curves came from. Check out the cached link below (I'll try to update the link if I can find the article). Basically, using pipe schedule systems and varying end head pressures, the densities & areas were developed.
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Vinnie
12/17/2020 09:33:25 am
In EH applications you can also use the high temp area reduction with the lower density gained by going up the curve.
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Franck
12/17/2020 10:18:54 am
I used to work for an Insurance company in the US (Kemper) that was mostly using 3000 sq ft for the recommended design of all installations.
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Brian Gerdwagen FPE
12/18/2020 02:59:00 pm
The best reason to use something other than 1500 sqft is because you have to. If you calculate your remote area of 1500 square feet, and you wind up at 1560, you can get some relief from the density curves. Maybe it's 0.095/1560. You need to check the 1.2sqrt 1560 and make sure your rectangular area still works, but the smaller density means a lower start pressure for the sprinkler. Maybe.
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