ABSTRACT
Changes need to be reviewed prior to their implementation. It is not only permanent changes, but also temporary changes, that need to be carefully evaluated, since some of the worst incidents have been caused by temporary modifications. Proper documentation, reviews and approval processes are particularly important. Both procedures for reviewing and clearance sheets are needed to facilitate Managed Changes. Clearance sheets need to typically address:
• Description, Purpose and Technical Basis for Change
• Safety & Health Considerations;
• Changes to Operating Procedures, Maintenance Procedures and Inspection/Testing Procedures;
• Changes to drawings such as PFDs, P&IDs;
• Changes to Electrical Area Classifications;
• Changes to Training/Communications;
• Pre-Startup Inspection;
• Duration, if Temporary Change;
• Approvals & Authorizations.
