Abstract
Since the introduction of GERT (graphical evaluation and review technique) many papers have been published to show its application in various fields of engineering, management and system study, etc. Application to the precommissioning/commissioning of different types of plant of a refinery has not yet been shown in the literature. In this paper its application to one such plant, a water treatment plant, is shown. The function of the water treatment plant under study is to control oily sludge, sewage and wastewater treatment. The plant must be precommissioned and then commissioned to its full operations. There are 14 activities in both precommissioning and commissioning the plant; these are then classified into simple and composite (stochastic) ones. A GERT network model is then developed and analysed to obtain the mean number of days needed to precommission I commission the plant. The probability, of course, is shown to be one, as the plant must function.
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