online_headloss_orifice_meter:  Head loss using an orifice meter An orifice meter Online discharge using orifice meter ν = f(T) ReDo = 4Q/(πDoν) K = f(ReDo, Do/D1) Ao = (π/4) Do2 hf = [Q/(KAo)]2/(2g) h = hf/[(ρ2/ρ1) - 1] [SI units: Q in m3/s; D in m; T in °C; h in m] [U.S. units: Q in cfs; D in ft; T in °F; h in ft] INPUT DATA: Select:   SI units (metric) U.S. Customary units Discharge Q :         Warning: Undefined variable $dischargeunits in /var/www/html/ponce/onlineheadlossorificemeter.php on line 653 Pipe diameter D1 :         Warning: Undefined variable $diameter1units in /var/www/html/ponce/onlineheadlossorificemeter.php on line 661 Orifice diameter Do :         Warning: Undefined variable $diameter0units in /var/www/html/ponce/onlineheadlossorificemeter.php on line 669 Temperature T :         Warning: Undefined variable $temperatureunits in /var/www/html/ponce/onlineheadlossorificemeter.php on line 677 Ratio ρ2 /ρ1 :         [Leave blank to set mercury manometer as default ρ2 /ρ1 = 13.6] OUTPUT: hρ2 =  Warning: Undefined variable $headloss in /var/www/html/ponce/onlineheadlossorificemeter.php on line 700 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlineheadlossorificemeter.php on line 700 0   Warning: Undefined variable $headlossunits in /var/www/html/ponce/onlineheadlossorificemeter.php on line 700 hρ1 =  Warning: Undefined variable $headf in /var/www/html/ponce/onlineheadlossorificemeter.php on line 702 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlineheadlossorificemeter.php on line 702 0   Warning: Undefined variable $headlossunits in /var/www/html/ponce/onlineheadlossorificemeter.php on line 702 • Orifice on Wikipedia   Your request was processed at  11:00:16 pm on April 3rd, 2025   [ 250403  23:00:16 ]. Thank you for running online_discharge_orifice_meter.   [160720]