Experience Gained During Proof Test Data Collection

ANSI/ISA 84 requires periodic proof testing of Safety Instrumented Functions (SIFs) to demonstrate the correct operation of the loop elements along with sufficient historical documentation to support analysis of discrepancies and validation of the SIF integrity and reliability. The analysis of proof test records is an important element of the quality assurance process necessary to support continued use of installed equipment. The CCPS Process Equipment Reliability Database (PERD) project has developed failure data taxonomies which provide a structure to capture data to support chemical process data collection and analysis.

SIS-TECH® has recently begun collecting device performance data during periodic SIF proof testing. The data is collected using the PERD taxonomy supplemented with detailed classifications differentiating device technologies and human factor causes for failure. The data will be contributed to PERD under a quality plan for review and analysis to support chemical process sector. The paper discusses the data collection methodology, linkage to PERD taxonomies, and lessons learned from initial implementation.