Water hammer stress on water transmission line

Abstract

The present work investigated the pressure changes caused by water hammer through the georeferenced model to investigate the stress impact on water transmission lines. The results of the hydraulic analysis of the research showed that the sudden stop of the pumps in the transmission line 1,600 m in length caused negative pressures of −5 to −10 (bar). In pressure values close to −10 (bar), the water vaporization, cavitation, and separation of the column happened. The maximum pressure in the transmission line was calculated to be 43 (mH2O) and the minimum pressure in the transmission line was 10 (mH2O). The relative vacuum mentioned in the transmission line as a destructive factor caused two columns of steam and water to collide. The collision of two columns caused a great pressure that had the potential to destroy the transmission line. The research results showed that the maximum amount of elastic strain was equal to 0.0016772 mm/m. The equivalent stress beneath the pipe varied from 0.000 to 0.0700 m and the maximum stress value was 3.3535E7 (Pascal). The maximum amount of deformation or change in the shape and size of the pipe due to the applied stress (0.000–0.0700 m) was equivalent to −1.9287E5 m.