Experimental Studies on Resistance Characteristics of Combined Fittings in Branch Part in Building Water Supply System : Interaction of Pressure Loss of Combined Fittings

Abstract

As the interaction of pressure loss of combined fittings has not been considered in building water supply piping design, the authors chose combined fittings which are frequently used and popular in buildings, and grasped the profile of interaction of pressure loss by the experiment of resistance characteristics for single fitting and combined fittings. The combined fittings for experiment consist of one tee and two elbows, or one tee and one elbow. The experiments are carried out for changing flow course and connective length between each fittings, the characteristics of interaction of pressure loss are shown, and the influence of relative sectional area and flow separation ratio are considered.