Various potential causes of damping pressure waves in water-hammer-like flows are discussed, with special attention being paid to their qualitative influences on measured histories. A particular purpose is highlight complications encountered when attempting interpret unexpected behaviour pipe systems. For clarity, each cause considered isolation even though two or more could exist simultaneousl...

This paper investigates multiple-valve closures in a simple reservoir-valve-pipeline-valve system. Multiple closing (or opening) of valves may induce large positive or low negative pressure waves due to wave interference (superposition the waves). The effect closure can be either beneficial detrimental, with outcome being entirely dependent on position and sequence delay closures. Valves are in...

Water hammer may occur upon rapidly closing a water pipe valve. Oscillating pressure waves generated in the system cause significant equipment damage, including joint leaks and even rupture. Similar phenomena can when starting stopping pumps. As various situations potentially damaging waves, related are grouped as “hydraulic transients.” The not limited to pipes any liquid, condensed gases such...

Abstract In the present study, a water transmission pipeline under steady conditions is modeled followed by examining transient flow created failure of pumps in pipeline. This 31 km from Kerman, Iran. The software analysis results were compared with those numerical model for laboratory test to validate modeling. While flows are pump failure, various areas pipelines will be affected waves produc...

Genetic algorithms have been used to solve many water distribution system optimization problems, but have generally been limited to steady state or quasi-steady state optimization. However, transient events within pipe system are inevitable and the effect of water hammer should not be overlooked. The purpose of this paper is to optimize the selection, sizing and placement of hydraulic devices i...

The objective is to evaluate the primary mechanical and physical properties of particleboard made from hammer-milled rice straw particles of six different categories and two types of resins. The results show the performance of straw particleboards is highly dependent upon the straw particle size controlled by the opening size of the perforated plate inside the hammer-mill. The static bending an...