4308 (RP-968) -- Pressure Loss Coefficients of Threaded and Forged Weld Pipe Fittings for Ells, Reducing Ells, and Pipe Reducers

Pressure loss coefficients were determined for regular and long radius ells, reducing ells, concentric pipe reducers, and pipe expansions. The fittings tested were 2-inch threaded malleable iron and 4-inch forged steel weld. A total of 250 fittings from 11 different manufacturers were tested for loss coefficients. Sample groups of production fittings of each type and from each manufacturer were tested at a constant velocity to determine the mean and variation of loss coefficients within the sample groups. One fitting of each type and manufacturer was tested for loss coefficients at a range of pipe velocities. The fittings selected from each group were the fittings that had pressure loss coefficient closest to the mean loss coefficient for each group.

Units: Dual