Shazbot! 2g=64.4 (62.4 is the weight in pounds of a cubic foot of water). On Feb 17, 2017 5:05 PM, "Brad Casterline" <[email protected]> wrote:
> Vince, > > I think you are looking for something with a little more meat on its bones > than rearranging Q=K*SQRT(P). A few years ago you mentioned K Value. > Counselor Greenman presented this evidence: > > http://www.metropumps.com/ResourcesFrictionLossData.pdf > > The first item is Angle Valve, which might be close enough to Hose Valve, > but the problem is the second item is also Angle Valve with a different > value and I saw no clarification of what's what with that. But when Steve L > testified to 3-5 psi loss at 250 gpm I rearanged and I think the second one > is correct; K Value=2.7- - - > > Using the 5 psi loss, hf=11.55 ft. > I converted 250 gpm to .557 ft^3/sec and 2.5" nominal to .034 ft^2 and > dividing the first by the second got v= 16.38 ft/sec, squared that, divided > by 2g (62.4), and then divided 11.55 by that for K Value = 2.77. > This should be more useful for you because friction head is directly > proportional to the square of the velocity, and K Value is a counter part > of Coefficient of Discharge in that C of D = the ideal world based on > nominal / the reality of the measurement. > > still yours after forty years, your first grasshopper, > > Brad > On Feb 17, 2017 8:28 AM, "Vince Sabolik" <[email protected]> wrote: > >> Good morning, everyone... >> >> Does anybody have a decent K Factor for a 2½" hose valve? >> >> Thanks! Vince >> >> 11351 Pearl Road / Suite 101 >> Strongsville, Ohio 44136 >> Phone 440 238-4800 <(440)%20238-4800> Fax 440 238-4876 <(440)%20238-4876> >> Cell >> 440 724-7601 <(440)%20724-7601> >> >> >> * Vince Sabolik * >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum- >> firesprinkler.org >> >>
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