online_pipeflow_headloss:  Calculation of head loss in a pipe Online discharge in a pipe Online diameter in a pipe V = Q/[(π/4) D2] ν = f(T) Re = V D/ν f = 0.25 {log[(ks/D)/3.7 + 5.74/Re0.9]}-2 hf = f (L/D) V2/(2g) [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/onlinepipeflowheadloss.php on line 520        Pipe length L :         Warning: Undefined variable $pipelengthunits in /var/www/html/ponce/onlinepipeflowheadloss.php on line 528 Pipe diameter D :         Warning: Undefined variable $diameterunits in /var/www/html/ponce/onlinepipeflowheadloss.php on line 542        Temperature T :         Warning: Undefined variable $temperatureunits in /var/www/html/ponce/onlinepipeflowheadloss.php on line 550 Absolute roughness ks :     A. Riveted steel B. Concrete C. Cast iron D. Galvanized iron E. Asphalted cast iron F. Commercial steel or wrought iron G. Drawn tubing     OUTPUT: hf =  Warning: Undefined variable $headloss in /var/www/html/ponce/onlinepipeflowheadloss.php on line 591 Deprecated: round(): Passing null to parameter #1 ($num) of type int|float is deprecated in /var/www/html/ponce/onlinepipeflowheadloss.php on line 591 0   Warning: Undefined variable $headlossunits in /var/www/html/ponce/onlinepipeflowheadloss.php on line 591 • Pipe Flow in Wikipedia   Your request was processed at  10:50:46 pm on April 3rd, 2025   [ 250403  22:50:46 ]. Thank you for running online_pipeflow_headloss.   [190604]