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 16772E-7 mm/m. The equivalent stress beneath the pipe Q4 varied from 0.000 to 7E-2 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 (0.000–7E-2 m) was equivalent to 1.9287E5 m. HIGHLIGHTS Conceptual model for the water transmission line.; Investigation of the most critical point geospatial location.; Determination of critical points due to the water hammer in the transmission line.; Meshing and analysis of the most critical point on the pipeline and supports in the transmission line.; Concrete support for the most critical point to deal with the maximum stress in the transmission line.;

Keywords

• maximum pressure wave
• pipeline
• surge tank
• transient flow
• water hammer
• water loss