![]() ![]() These K-values also generally assume fully developed turbulent flow, and thus are inaccurate at low Reynolds Numbers. For example a DN 50 (2”) long radius 90° elbow is not geometrically similar to a DN 150 (6”) long radius 90° elbow, thus the K-value is inaccurate at sizes other than that of the fitting used to determine the K-value. ![]() ![]() However it is less accurate than other methods as it does not take into account the varying geometries of fittings at different sizes. It is more accurate than the Equivalent Length method, as it can be characterised against varying flow conditions (i.e. The K-value represents the multiple of velocity heads that will be lost by fluid passing through the fitting. The K-value, Resistance Coefficient, Velocity Head, Excess Head or Crane method allows the user to characterise the pressure loss through fittings in a a pipe. ![]()
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