REDUNDANCY SYSTEM OF CHEMICAL PROCESS PLANT

概要

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In the redundancy system of chemical process plants, the author proposes a new type hybrid, or combination of active parallel and standby type in this paper. The author also discusses in this paper which type of redundancy system is most economically profitable for a specific case. Generally speaking, the standby type is preferable for smaller subsystems, and the active parallel type is preferable for larger subsystems. Quantitative criteria for the above are derived under some assumptions.Example; Total plant cost is 10 MM and efficiency of subsystem without redundancy is 0.95. Efficiency increase through active parallel and standby redundancy is 0.03 and 0.05, respectively. In this case, for the ratio of subsystem investment cost without redundancy to total investment cost, 0-1.8% standby type is preferable. 1.8%-9% active parallel type is preferable.Accordingly, a big compressor (0.5 MM) must be of 2 streams and a pump (10 M$) must be of standby redundancy. Connecting piping system between equivalent parallel systems is also discussed in this paper.
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