NFPA 13 says to be flow tested at SYSTEM DEMAND. One might want to
use the definition that system demand is Sprinkler flow plus hose
demand but the INTENT is to only add hose demand if there are hose
connections (or a hydrant) downstream. NFPA 25 is much more precise
in their description and says exactly that.
There is guidance in the annex regarding what can be used but NFPA 13
is very sloppy regarding this issue. There will be discussion this
cycle regarding adding to the list of things required for the
submittal verification that the provided means is capable of meeting
the system demand.
Roland
On Oct 4, 2010, at 11:45 AM, Ron Greenman wrote:
As we discussed a few weeks ago the first thing we need to know is
what do we need to test: forward flow only, forward flow at the
hydraulic design, at the design plus hose stream, at the capacity of
the lead-in at the supply pressure, to insure that the checks
completely open...? That will determine what size feed you need to
your test point. Then how do you demonstrate you've met the test
parameters? Barring an answer to the first question you can't answer
the second so this is a mute discussion that is based on reading
chicken bones for a solution. The question isn't how to perform a
forward flow test but rather what question am I trying to answer
when doing so. How will then obvious.
Ron Greenman
...On the phone
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