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Pressure loss coefficients were determined for pipe tees and reducing tees. The fittings tested were 2-inch threaded malleable iron and 4-inch forged steel weld. A total of 142 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 and a 50% branch flow and 50% line flow 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 for a range of flow distribution. The fittings selected from each group were those that had pressure loss coefficients closest to the mean loss coefficient for each group. Additional tests were later conducted to verify that the loss coefficients were independent of inlet velocity.

Units: Dual