Evaluation of Flashing Jet Impact on Surroundings Due to Leakage of High Pressure Pipes

Abstract

If the water piping system under high temperature and pressure is damaged and water is ejected into the atmosphere, a jet with depressurization boiling (Flashing) may occur. Therefore, it is necessary to evaluate the range of the jet impact on surrounding equipment and people. The range of the jet impact is evaluated by the existing code adopted in Japan (JSME S ND1) which referred to the standards adopted in America (ANSI/ANS-58.2-1988). The problem with this standard is that the experimental validity of the range of the jet impact has not been confirmed in Japan. In this study, we investigated experimentally to confirm the validity of the expanding angle and the affected area of the flashing jet of saturated water under low-pressure conditions, and further investigated the high-pressure conditions, which are difficult in the experiment, using Computational Fluid Dynamics (CFD).