Operations, MOC & Decommissioning Services
Sustain safety performance through the operations mod decommissioning phase with proof testing,
change control & revalidation that keep your safety systems reliable for life.
10-Year Active Term Contract with Shell (Sabah/Sarawak) | CIDB G4.
The PISB Approach
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Keeping Safety Systems Reliable Through Operations Mod Decommissioning
A safety system that passes validation on day one will not stay reliable on its own. Through years of operation, modifications, and eventual decommissioning, integrity can quietly erode — unless it is actively sustained.
The operations mod decommissioning phase is where most of an asset’s life is actually spent, and where functional safety is most often lost. At Pure Integrity, we help asset owners maintain safety performance across this phase in accordance with IEC 61511 — through proof testing, management of change (MOC), bypass and override control, periodic revalidation, and safe decommissioning of safety instrumented functions.
The Process
How Operations Mod Decommissioning Works?
Pure Integrity begins by reviewing how your safety instrumented systems are operated, tested, and maintained — including proof test coverage and intervals, bypass and override handling, demand and failure records, and management of change practices.
We then help strengthen the operations mod decommissioning regime: confirming proof testing validates the assumptions behind each SIF, ensuring changes are assessed and re-verified before implementation, supporting periodic revalidation, and providing a structured, risk-based basis for safely decommissioning safety functions at end of life.
Problem We Solve
Degrading Safety Performance Over Time
We help sustain the integrity established at validation so safety functions keep meeting their target through life.
Inadequate Proof Testing
We review proof test intervals, coverage, and procedures to confirm they validate each SIF’s assumptions.
Uncontrolled Modifications
We strengthen management of change so modifications are assessed and re-verified before they affect safety.
Poor Bypass & Override Control
We help manage bypasses, overrides, and inhibits so temporary actions do not become hidden risks.
Missed Revalidation
We support periodic revalidation so safety systems are re-confirmed against current process and risk.
Unsafe Decommissioning
Benefits
A well-managed operations mod decommissioning phase keeps safety systems performing for the full life of the asset, not just at startup.
Sustains the integrity achieved during validation
Confirms proof testing actually validates SIF assumptions
Keeps modifications under proper functional safety control
Reduces hidden risk from bypasses and overrides
Supports periodic revalidation and IEC 61511 compliance
Provides a safe, structured basis for decommissioning
Maintains audit-ready functional safety documentation through life
Why Us?
ure Integrity provides practical, standards-driven support across the operations mod decommissioning phase, backed by certified Functional Safety expertise.
Practical Proof Test & MOC Support
We make proof testing and management of change workable in a live plant, aligning intervals, coverage, and change control with how your operations and maintenance teams actually work.
Risk-Based Decommissioning
We bring a structured, risk-based approach to retiring safety functions, so end-of-life changes are made without quietly removing protection that is still needed.
End-to-End Lifecycle Continuity
Because we also deliver the SRS and realisation phases, the assumptions we sustain in operation are the same ones we helped define & verify, no fragmented studies, no lost intent.
Deliverables
Operations mod decommissioning gap assessment
Proof test interval, coverage & procedure review
Management of change (MOC) review & recommendations
Bypass, override & inhibit management review
SIS performance & demand/failure data review
Periodic functional safety revalidation support
Decommissioning risk assessment for safety functions
Updated functional safety documentation & assurance records
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
Bachelor’s Degree in Chemical Engineering
Universiti Teknologi PETRONAS (UTP) Certificate
Certified Functional Safety Engineer
(Safety Instrumented Systems) TÜV Rheinland
FAQ
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What is proof testing?
Proof testing periodically confirms that a Safety Instrumented Function still performs as required, detecting hidden dangerous failures and validating the assumptions behind its SIL.
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How should safety functions be decommissioned?
Decommissioning should follow a structured, risk-based assessment to confirm a safety function is genuinely no longer required, so that protection is not removed while the hazard still exists.
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What is the operations mod decommissioning phase?
It is the part of the functional safety lifecycle covering operation, maintenance, modification (management of change), and eventual decommissioning of safety instrumented systems, the longest phase of an asset's life.
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Why does functional safety degrade during operations?
Without proper proof testing, change control, and bypass management, the integrity confirmed at validation can erode through wear, undocumented changes, deferred testing, and accumulated overrides.
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Why is management of change (MOC) important for functional safety?
Modifications can unintentionally undermine a safety function. MOC ensures changes are assessed and re-verified against the SRS before they are implemented.
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.
Keep Your Safety Systems Reliable For Life
Work with Pure Integrity to sustain functional safety through the operations mod decommissioning phase, from proof testing & change control to safe, structured decommissioning.
TUV Rheinland Partner | CIDB G4 Registered | HRD Corp Accredited