Design principles in Safety Technology
In safety technology, several basic design principles are applied. Two of them are briefly described in the following.
Fail safe
The fail safe principle requires that upon failure of a safety relevant system or component, it enters a safe state. A main precondition for the application of this principle is the existence of a safe state. For the railway this is a state, where all trains are at standstill in a certain track. If such a state exists, technical systems can be designed to enter it when they fail. A typical example is the train protection system.. However, the fail safe principle cannot always be applied.
Safe life
A system that does not have a safe state is e.g. the airplane. Then, the safe life principle has to be applied. It requires application of redundant and high reliable components to make sure, that the system always functions.
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