6.0. Fault Tolerance and Plant Ageing
There are a few relevant important points, which affect the hazard analysis and SIS. In this clause, short discussions on how fault tolerance and plant ageing affects safety systems in a plant are presented.
6.1. Fault Tolerance
In this part, basics of fault and fault tolerance vis-a-vis system requirements have discussed. Since fault tolerance is very much connected with PEs, so it is treated separately in Chapter XI.
6.1.1. Fault and Fault Tolerance
What is fault? From the system point of view, fault can be viewed some deviation from the expected behavior of the system. It is malfunction of the system. This fault may be due to human error, hardware failure, software failure, and/or design problem. Depending ...