https://www.dropbox.com/s/84maxxgso3fl1hp/BFP_Forward_Flow_English.xlsx?dl=0
https://www.dropbox.com/s/zf9r2fingozs2om/BFP_Forward_Flow_Metric.xlsx?dl=0 Hi Forum, I am nearing the end of my obsession with this, at least posting about it. To the spread sheet I had added the data for absolute roughness I found most satisfying; there are four categories, each with minimum and maximum values. Then I 'discovered' NFPA 750 (2015): Table 11.2.2(a) recommends a value for absolute roughness. Table 11.2.2(b) shows approximate values for dynamic viscosity, and densities for clean water. The discussion in A.11.3 is very informative. A.11.2.2 shows a formula for solving for the friction factor based on the Reynold's number, velocity, and C-factor, but I rearranged it to solve for the HW C-Factor instead due to the discussion in A.11.3. See G19 on the spread sheet. The utility of this is really to get a "Flow Test" at the riser gauge without flowing any water. For example if the latest Main Drain tag says Static = 52 PSI, Residual = ?? PSI, and you input the diameter, length and fittings (column K), make sure the angle valve K-Value is correct for the diameter at D7, and adjust the flow at B10 until you get 52 Pt (static at riser) at G15, you will have a Static, Residual, and Flow with the riser gauge as the Source Node. Thanks, Brad Casterline AFSA Designer Member and SET _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
