Proof Testing of safety critical components and elements is an obligatory and often onerous task that operators must carry out in maintaining their Safety Instrumented Systems (SIS). Periodic proof testing is essential to maintain the safety integrity levels of the safety instrumented functions. Failure to proof test correctly to achieve the targeted proof test coverage and according to the required proof test frequency could mean that the SIS might fail to perform the required safety function when an actual process demand arises. Poorly designed proof test procedures may even mean incomplete testing and introduction of systematic failures in the SIS.
Yokogawa engineers and specialists leverage our extensive field experience to efficiently support plant operators identify and define proof testing requirements and procedures.
Customer Challenges
- Insufficient specialized knowledge of the SIS element technologies and resources to write detailed proof test procedures for the many technologies in use.
- Insufficient resources to proof test the many different safety devices at the required proof test intervals.
- Juggling production schedules to meet proof test frequency requirements.
- Scheduling and keeping record of proof test results.
- Keeping track of and taking credit for genuine and spurious plant trips.
- Being able to re-evaluate frequency of testing based on historical test data, plant experience and hardware degradation.
Our Solution
Yokogawa services and solutions include:
- Designing proof test procedures and templates.
- Proof testing at site and proof test reports.
- Optimization of proof test intervals.
- Re-assess the SIF PFDavg calculations based on the proof test results.
- Automation of sensor testing.
- Integration of operational events (trips and shutdowns) with proof test calendar.
Customer Benefits
Partnering with a trusted and experienced international team of Functional Safety Experts providing proof test services of the installed Safety Instrumented Systems to:
- Maintain Safety Integrity Levels of plant Safety Instrumented Functions while maximizing production uptime.
- Reveal dangerous undetected failures to avert hazardous consequences to people, the environment and assets.
- Improved productivity with optimized proof test intervals and scheduling.
- Time and cost savings with more efficient proof testing.
- Comply with regulatory requirements.
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