Which is an example of an Independent Protection Layer (IPL)?

An Independent Protection Layer (IPL) is a safeguard that is designed to operate independently from other layers of protection in a risk management system. It functions as a form of barrier to prevent or mitigate hazardous events, ensuring that if one layer fails, the others still provide sufficient protection.

A high-temperature switch that shuts off a heating element exemplifies an IPL as it actively intervenes when necessary, such as in the event of overheating. This switch operates independently and is specifically designed to prevent a potentially dangerous situation, which aligns with the characteristics of an IPL. Its effectiveness relies on its ability to reliably disconnect the heating element from power, thus preventing overheating and associated risks.

In contrast, an operational control panel might contribute to overall safety but does not function independently to prevent a hazardous event. Similarly, a scheduled maintenance protocol is important for ensuring that safety equipment remains functional, but it does not act in real-time to stop an incident from occurring. Regular employee training sessions enhance safety awareness and knowledge but do not serve as a direct, independent operational control against specific hazards. Therefore, the high-temperature switch is the clear example of an IPL in this context.