A Study on the Flow Characteristics of the Trap of Sanitary Fixtures : Part 2-Flow Characteristics of S Trap of the Plural Fixtures

Abstract

The first paper reported the characteristics of the discharge flow which occurred when an S trap was attached to a sanitary fixture. These flow characteristics were researched from the standpoint of the relation between water supply and drainage systems. This report is the second of a series on experimental studies on the influences of water seal loss in traps attached to sanitary fixtures and analysis of the mutual relation of multiple fixtures set in certain positions. The water seal loss in a trap is influenced by the inlet angle of the discharge branch pipe and the position of some fixtures. The results of experiments conducted to observe the flow characteristics, water seal loss, pressure in fixtures pipe and so on make it clear that delayed flow at the joints is a major cause of water seal loss in a trap. Based on these results, the generation of pressure in a discharge pipe which influences traps was considered.