I am looking at a project where we are renovating an existing building with
a new system. There are other buildings on the site (1930's vintage) that
share the underground lines. To bring the site into compliance with
current codes, RPZ backflows are being added at the entrance to the site.
The existing buildings are occupied, and the fire department is looking for
some assurance that the systems will work with the addition of the backflow
preventer. I remembered (though have never applied it) section 11.2.2.8
allows for the calculation of the residual pressure at the highest
sprinkler, and deducting elevation, BFP losses ect... The buildings in
question are over 5000 sqft, so the minimum 50 psi will apply.
So my question is, do I just utilize the residual pressure from the closest
hydrant, deduct the elevation and backflow losses from the residual and
call it a day? Or do I need to account for additional friction through the
system piping? Both 13 and the handbook seem to be mute on this.
Thanks again, Forumites.
Jamie Seidl
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