ANALYZING NON-STATIONARY PROCESSES IN ABNORMAL OPERATION MODE OF PUMP STATIONS
The paper analyzes the impact of wave processes in transitional and emergency operation modes of hydraulic systems, which will inevitably result in lowered strength limits of pipelines, the accumulation of metal fatigue, especially in concentrating points of metal fatigue stresses resulting in increased probability of accidents with pipeline breaks. The paper justifies the necessity of simulating possible emergency situations of pumps applied in a water supply system in order to establish a possibility of using modern calculating methods of transient processes in pumping stations of water supply systems. The simulation results have demonstrated that the discharge line of a water supply system is highly probable to feature discontinuity of water flow in case of the pump emergency shutdown. The calculations show that the installation of a discharge line pressure stabilizer under the brand SDT 16-100 with one dampening camera directly on the pump, the check valve and the water line gate valves (the sources of disturbances), will reduce the amplitude of pressure fluctuations in the water supply system at 2.5-2.6 times and lead to a more rapid attenuation of the wave processes by changing alternating shock loads into smoother time-expanded ones. The authors have stated that water supply system emergency protection based on wave stabilization technology will protect the pipelines from breaks in case of emergencies; provide energy savings by reducing accidents in pipelines and enhance the continuity of supplying population and enterprises with water.