It is important to realise that safety valves are moving mechanical devices
Safety valves protect processes, personnel and the environment against process disruption. However, they are operated only in trip situations, but it is essential that they perform, when required. Because these shutdown valves are rarely cycled, there is always concern over whether they will operate on demand. In practice, unless they are periodically stroked, it is virtually certain that they will not work when required.
It is important to realise that Safety valves are moving mechanical devices that normally operate in very difficult environmental conditions. Furthermore, they are the most important components in the safety loop (sensor, safety logic and final element), because most of the problems that occur are related to the functionality of the final element. The need for regular valve testing and for testing while the process is running is therefore absolutely essential.
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