Implementation of Safety System Programming Changes at an Operating Facility

摘要

This paper reviews the development and implementation of safety system programming changes for a large refinery as part of a multi-unit upgrade project. Programmable Electronic Systems (PES) based safety systems can offer the option of making online programming changes so that operations can continue without having to shut a unit down. However, making changes to an operating safety system means that the entire unit covered by that system is placed at risk during and after the change is made. The resulting consequences can potentially be much more severe than shutting down the unit or plant. Therefore, meticulous panning in development and implementation is required to ensure that changes are made correctly and safety. This paper will briefly review the development of the safety system programming, review the process of how the safety system programming was developed and revised, and then describe how the programming change were accomplished at the site.