# Kf (Equivalent length in pipe diameters)

A Kf value is sometimes used to express the pressure loss relationship as a function of flow. There are many types of pipe fittings that are described by Kf values which can be found in Crane [13]. It is possible to enter any type of fitting into the FluidFlow database, but FluidFlow does not force you to work in this way as it is also possible to add/change a Kf value directly via the Input Editor.