Ca Hydraulic transient is a factor to be considered during structural design of water conveyance system. The most common hazardous situation is the uncontrolled pump trip due to power failure. Therefore, surge analysis is important for a water delivery project having long pipeline. Customized software WH 2.7 is used to solve the problem of surge in pipeline. Method of characteristics is widely used mathematical scheme for solving the phenomenon because of higher accuracy. The partial differential equations may be transformed by the method of characteristics into total differential equations. The later equations may then be integrated to yield finite differential equations which are conveniently handled numerically. This paper describes the problem of water hammer in long pipeline of lift irrigation scheme. The pumping station of lift irrigation scheme is located on riverbank and is to lift the water to the reservoir located at distance of 5.5 km through 1300mm diameter and 11/8 mm thickness mild steel pipeline. Three vertical turbine pumps each having capacity of delivering 0.937 m3/s (total discharge capacity 2.8 m3/s) and 43.24 m total head to irrigate the command area of 3300 ha. Continuous number of trials led to select combination of one air vessel of capacity 50 m3 and 10 Air Valves. Studies carried out helped to foresee advent conditions like column separation well in advance before implementation. This way it helps to finalize piping system incorporating anti surge devices like air vessel and air valves to keep the pipeline safe from water hammer due to power failure to the pumps and hence reliable operation for long run.
Water hammer, Vertical turbine pumps, Method of characteristics, Air vessel and Air valves
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