Project:Sandbox

15.1 Emergency shut down actions
The following list is an example of how to summarize all the actions that are automatically implemented by the SIS or the emergency shutdown system when the emergency button is pushed:

15.2	Failsafe position for automatic valves
The fail-safe position of valves have to be clearly indicated in a table, compiled at the end of the safety study, and communicated to the instrumentation engineer. The failsafe positions of valves have also to be clearly indicated on the PID’s.