Calculation of pressure drops of flowing liquids and gases in pipes and pipe elements (laminar and turbulent flow). New version of Online Calculator is available: www.pressure-drop.online

SF Pressure Drop calculates pressure drops of flowing liquids and gases in pipes (laminar and turbulent flow). It's also possible to calculate pressure changes caused by vertical difference of pipe and caused by changes of kinetic energy (dynamic pressure change).

Aluminium, drawn/pressed: new: 0.0013 - 0.0015 mm: Aluminium, drawn/pressed: used: to 0.03 mm: Asbestos-cement: new, smooth: 0.03 - 0.1 mm: Brass, drawn/pressed

Calculation of pipes in turbulent range: In addition to Brandtl-Colebrook and Blasius/Nikuradse/Karman/Moody you can use the formula from Churchill also. New in Version 7.0

SF Pressure Drop 7.x for Windows calculates pressure drops of flowing liquids and gases in pipes (laminar and turbulent flow). It's also possible to calculate pressure changes caused by vertical difference of pipe and caused by changes of kinetic energy (dynamic pressure change).

If you have select the condition "gaseous" the program calculates the pressure drop with an approximate equation (pressure drop at arbitrary heat transfer). The program sets the pipe friction number as a constant and calculates it with the input data.

Calculation of pressure drop caused by friction in fittings etc. To calculate pressure drop in fittings we use resistance coefficients normally. The resistance coefficients are in the most cases found through practical tests.

Calculate the pressure drop of your pipe element(s) at any rate of flow. The used ements should be matched (example: same diameter). SF Pressure Drop is not able to check it.

You can calculate pressure drops in pipes with non-circular diameter with the normal formula if you use instead the diameter the hydraulic diameter: Hydraulic diameter = 4 * cross section area / circumference

The element "Dyn. pressure change" calculates the static pressure changes caused by changes of kinetic energy. Normally you input the dimension of begin and end of the whole pipe. Attention: The calculated data are output as pressure drop, i.e. if the output is negativ the pressure is encreasing, if the output is positiv the pressure is decreasing.