RELIABILITY BASED DESIGN OF PUMPING STATION FOR AN URBAN WATER SUPPLY SCHEME

Abstract

Pumping stations are one of the maj or components of water supply systems. A pumping station consists of one or more pumping units supported by appropriate components such as electrical, piping, control, and structural. The pumping unit is primary subcomponent within the pumping station and includes four major sub -subcomponents: pump, driver (motor, engine;. etc), power and controls. Although there are more sub -subcomponents in pump g unit Land these may be selected as the level of evaluation but the availability of repair data is rather poor. Each of thesg unit is to be considered in an operatiOnaLstate. The--mechi ility of they because of the s;involved in fault tree anal is can lie (Henley and Ku a oto 1981) lintdetaill- k... input for these complex cornputatio0 met Simplified technique pro ability concepts and dview of the pumping station design assump e useIlto.est ate the mechaneal reliability of the pumping station. 1 A common da4'el' practice is to install sufficient purrips to handle peak flows and include a spare pump of equal size to accommodate any downtime of the other pumps. Thus mechanical failure of the pumping station could be definera'S'the simultaneous failure of two or more pumping unit s while peak capacity is required. Pipe networks seldom consist of loops only. In practice, they are of composite type consisting of loops, branches, and serial parts. However, it is usually possible to reduce a composite network to a looped network for analysis, and therefore composite networks are referred to as looped networks. Looped networks are common in densely populated areas. So valuate iques such as ation reliability orn7available for iv They provide a greater reliability of service than branched systems, eliminate dead ends, and improve flow conditions duri ng periods of high local demand. EPANET can be used to plan and improve a system's hydraulic performance. Pipe, pump and valve placement and sizing, energy minimization, fire flow analysis, vulnerability studies, and operator training are just some of the activities that EPANET can assist with.