1.Previous
3.Next

would be provided by a pressure safety valve (PSV) on the vessel.

The next stage of the analysis relates all the sensing devices, shutdown valves (ESVs), trip systems and emergency support systems in the form of a Safety Analysis Function Evaluation (SAFE) chart.

X denotes that the detection device on the left (e.g. PSH) initiates the shutdown or warning action on the top right (e.g. ESV closure).

The SAFE chart constitutes the basis of Cause and Effect Charts which relate the sensing

1.Previous
3.Next