Abstract
The paper discusses the behavioural analysis for a shell gasification and carbon recovery process in a urea fertilizer plant. The system consists of three subsystems D, E and F arranged in series, with three possible states—good, reduced and failed. The subsystem D has three parallel operating units with two units in cold standby. Failure and repair rates for each subsystem are taken as constant. Formulation of the problem is carried out using simple probability consideration. An expression for steady-state availability is derived. Taking data from a medium sized plant, the effect of each working unit on the system availability is tabulated. The results are supplied to the plant personnel for improvement in designing the system and planning the process for minimum failure.
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