I disagree completely with what you said but agree completely with
what you meant.
You can convert all such flow and pressure points to an EQUIVALENT k-
factor (might as well call it as identified in 13 so as to
differentiate from sprinklers)
It is NOT 100% accurate since it does not account well for significant
changes in friction loss. Typically the change in flow is not that
large so THE main rule of sprinkler hydraulics is applied. That being
- it's close enough. For instance, the allowed k-factor range for a
1/2"orifice is 5.2 to 5.8. For OHGI at 130 sf requiring a flow of
19.5 gpm, the pressure for 5.2 is 14.1 psi and for 5.8 is 11.3 psi but
we use a nominal 5.6.
The process is not intended to being driven by academic purity. It's
intended to provide a reliable and repeatable process THAT WORKS.
Roland
On May 23, 2008, at 6:17 AM, Pip Males (Shared Services, IT,
Manchester) wrote:
nything with a flow and a pressure, like a system demand, can be
converted
to a K factor."
NOT STRICTLY TRUE:-
Any pipe work system has a characteristic (system curve) similar to
(but not
the same as) a discharging device. As a pipe work system has pipes
which
perform to a 1.85 law and discharging devices that perform to a
square law
the form of the system curve is somewhere between a pure square law
and a
pure 1.85 law.
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