Safe operation is key

Each interlocked system has a dedicated, engraved tag location within the key cabinet to ensure total integrity and all keys are visually displayed inside the cabinet during periods of normal operation. Once the initial key has been retrieved from the central key cabinet, an operator can begin the sequence of key transfer events that allows dangerous machinery and critical valves to be operated in a safe and pre-determined way, eliminating human error. To facilitate this, key cabinets should be located in a secure place. Initial keys are typically issued by the permit officer. Key cabinets have fully lockable doors.

Throughout the procedure, the control room has a clear indication of work in progress; a transparent perspex window provides visual key status. A ‘visual alert’ tag is revealed when the key is removed, providing details of the issued key, its designated location and a ‘work in progress’ signal.