Assurance through validation

Verify that safety functions perform as designed, reducing risk and ensuring compliance

Safety Instrumented Function (SIF) verification is a detailed engineering analysis used to confirm that a safety function meets its assigned Safety Integrity Level (SIL) target. It evaluates design performance, failure rates, and reliability to ensure the system achieves the required level of risk reduction and complies with functional safety standards.

  • Calculate

Must calculate the average probability of failure on demand to verify that the designed SIF actually meets its target Safety Integrity Level.

  • Prevent

SIF verification ensures that systematic design flaws do not slip through, helping to prevent a dangerous hidden failure.

  • Predict

Verification software can predict how changing the proof test interval from one year to three years will impact the function’s overall reliability.

  • Optimize

Engineers can optimize the SIF design to balance high safety availability with a low risk of spurious trips.

  • Correct

The design team must correct the issue by selecting devices with a higher Safe Failure Fraction or adding redundancy.

  • Protect

Verifying every SIF across its entire safety lifecycle is needed to ensure the automated systems will reliably protect the plant assets and personnel.

Ensuring Your Safety Systems Deliver

Following Detailed Design

Performed after the SIL target has been set and the SIF has been designed

During Management of Change

The entire function must be re-verified if any component has been changed

Periodic Functional Safety

There are essential documents that are reviewed during periodic audits to confirm validity