What is SIL verification?

It confirms whether a designed safety function achieves its target SIL — assessing reliability, architectural constraints, and hardware fault tolerance.

How is it different from SIL determination?

Determination sets the target integrity; verification confirms the design meets it.

What is the difference between FAT and SAT?

FAT verifies the system at the supplier's facility; SAT confirms correct installation and performance on site.

What happens if a SIF does not meet its target SIL?

We identify the shortfall and recommend practical options, design changes, added redundancy, or revised proof test intervals to close the gap.

Realization, Design, FAT & Validation Services

Verify and validate that your safety systems achieve their required integrity
by design and in practice.

10-Year Active Term Contract with Shell (Sabah/Sarawak) | CIDB G4.

The PISB Approach

Your team works safer and more efficiently with manuals they can actually understand.

Proving safety systems meet their required integrity

A Safety Requirements Specification defines what a safety function must do the realisation phase proves the system actually does it. This is where design, hardware, software, and testing come together to deliver the integrity that hazard & SIL studies demanded.

At Pure Integrity, we provide SIL verification, design & software assurance & structured FAT, SAT, and validation in accordance with IEC 61511, confirming each safety function meets its target before it is relied upon in operation.

The Process

How realization, design, FAT & validation works?

We begin with SIL verification, assessing reliability (PFDavg / RRF), architectural constraints, and hardware fault tolerance against each SIF’s target, then review the SIS design and application software against the SRS and relevant standards.

As the system is built, we plan and support FAT & SAT, followed by validation and Functional Safety Assessment to confirm the complete system performs as specified before startup.

Problem We Solve

SIL non-compliance risk

We verify each function actually achieves its target SIL.

Unverified design assumptions

We confirm assumptions from the SRS hold true in the design.

Weak software integrity

We assess application software against the SRS and IEC 61511.

Inadequate FAT / SAT

We plan structured testing so faults are caught before reliance.

Gap between spec and build

We check the installed system matches what was specified.

Unproven safe-state performance

We validate the process reaches a safe state within the required time.

Benefits

Verification and validation turn specification into proven, dependable risk reduction.

Confirms each SIF meets its target SIL

Identifies design and architecture shortfalls before installation

Validates application software against the SRS

Reduces the risk of dangerous failure on demand

Provides documented FAT, SAT, and validation evidence

Supports IEC 61511 compliance and Functional Safety Assessment

Why Us?

Verification and validation carried out by certified Functional Safety professionals.

Rigorous SIL verification

PFDavg / RRF, architectural constraints, and hardware fault tolerance against target.

Design & software assurance

Hardware and application software reviewed against the SRS and IEC 61511 / 61508.

Independent Functional Safety Assessment

Structured FSA at the relevant lifecycle stages for an objective fitness check.

End-to-end lifecycle continuity

Verification connects cleanly to the SRS before it and operation after it.

Deliverables

SIL verification report (PFDavg / RRF)

SIS conceptual & detailed design review

FAT & SAT plans, procedures, records

Functional Safety Assessment (FSA) report

Architectural constraints / HFT assessment

Application software design assessment

Validation plan & validation report

Punch list & safety findings close-out

Johan Andak

Managing Director
Pure Integrity Sdn Bhd

Johan Andak is a process safety and operations specialist with decades of experience in the oil and gas, petrochemical, and energy sectors. As Managing Director of Pure Integrity, he provides strategic and technical leadership in process safety, functional safety, and risk assessment, supporting major projects across Southeast Asia, the North Sea, West Africa, Brazil, and Australasia.

Education & Certificate

FAQ

What is SIL verification?
It confirms whether a designed safety function achieves its target SIL — assessing reliability, architectural constraints, and hardware fault tolerance.
How is it different from SIL determination?
Determination sets the target integrity; verification confirms the design meets it.
What is the difference between FAT and SAT?
FAT verifies the system at the supplier's facility; SAT confirms correct installation and performance on site.
What happens if a SIF does not meet its target SIL?
We identify the shortfall and recommend practical options, design changes, added redundancy, or revised proof test intervals to close the gap.

Who We Work With

We have worked closely with many local and multi-national companies in Malaysia as well as overseas to fulfill their specific needs. Through close collaboration we have helped clients deliver safer, more reliable, and cost effective operations.