If you want to change the interlock logic, how do you do it?

Changes to process interlocks generally involve the following steps: 1. The production unit proposes a specific plan for the change and optimization. 2. The production management department shall organize the relevant departments to conduct reviews and assessments. 3. After approval, the Instrumentation and Electrical department will carry out the necessary modifications to the interlock logic. (At this time, the interlock must be temporarily disabled to prevent accidental operation.) ) 4. Modifying the interlock system requires simulation through a virtual interlock process as well as actual operational condition testing (such tasks are generally carried out during equipment maintenance) to ensure that the logic is correct and that the valves are in the proper positions. 5. All interlock changes must be reported and filed for record-keeping. Signed and confirmed by the respective responsible persons. 6. Before implementing the interlock changes, it is also necessary to conduct corresponding training and testing for the relevant operators.

It’s safer to change the logic and consult a design institute

If it is a modification to interlock parameters, the internal change procedure can be followed, along with a risk assessment； In the case of modifications to the interlock logic, the design firm conducts a safety assessment based on the company’s requirements; if it is feasible, an interlock logic diagram is provided. The company then carries out the changes either on its own or by entrusting an external party, following the appropriate procedures for external modifications