Reliability and Risk Assessment in Engineering by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9789811537462
Publisher: Springer Singapore

2 Mathematical Modelling

Surveillance tests are conducted on standby safety systems periodically to ensure system readiness and effectiveness in case of any emergency. During the surveillance testing and maintenance time, the system remains unavailable for normal use. Hence, any emergency condition occurring in this interval cannot be dealt with.

Consider that for a standby safety system, total time is divided into two parts corresponding to the respective time spent in standby condition and surveillance testing. As shown in Fig. 1, the total time (surveillance test interval, T) is divided into the time spent in standby state () and time spent during testing (). I and II are the two operating states, i.e. standby and testing, respectively.

Fig. 1Time spent by standby safety system in various states

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