Chapter 25. A Case Study
Pressure Control SystemThis chapter is a case study based on a typical pressure reduction system. It provides an example of the safety-integrity targeting described in Chapter 22. This is Chapter 11 of The Safety Critical Systems Handbook, D. J. Smith and K. G. L. Simpson, 3rd edition, ISBN 9780080967813.
This exercise is based on a real scenario. Spaces have been left for the reader to attempt the calculations. The answers are provided in Appendix 8.
25.1. The Unprotected System
Consider a plant supplying gas to offsite via a twin-stream pressure control station. Each stream is regulated by two valves (top of Figure 25.1). Each valve is under the control of its downstream pressure. Each valve is closed by the upstream gas ...
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