At the Reliability and Integrity Summit, Martin van den Heuvel (MISI) and Fred Gabriëls (SonoInspec) shared their perspective on how Minimum Intervention Strategy for Inspection (MISI) can help organizations mature their Risk-Based Inspection (RBI) strategies, highlighting practical ways to improve performance, reduce costs, and enhance safety without increasing operational risk.
In asset-heavy industries, minimizing downtime and maximizing safety without compromising regulatory compliance is the gold standard. Achieving that balance demands a strategic, data-informed approach to inspections, one that evolves beyond traditional routines. A methodology gaining traction in this space is the Minimum Intervention Strategy for Inspection (MISI).
What is MISI?
MISI is a complete methodology for transforming how organizations plan and execute inspections. It enhances existing RBI strategies by embedding them into a dynamic, living system. It introduces Integrity Operating Windows (IOWs), enables corrosion management integration, and adopts advanced inspection techniques, such as Non-Intrusive Inspection (NII) and robot-assisted inspections, to significantly reduce operational disruption.
At its core, MISI helps teams do fewer inspections, but only where it’s safe to do so. The goal is to make better decisions with less effort. It focuses on solving key challenges for operators, like:
- Reducing the time and cost of shutdowns
- Spending less on prep work like scaffolding and cleaning
- Keeping people out of risky spaces and cutting down on offshore travel
The Maturity Curve: From Basic to Optimized RBI
Organizations on the path to inspection maturity typically pass through several stages:
- Initial RBI and corrosion management framework adoption
- Process efficiency through standardization and scope definition
- Risk-effectiveness through improved data and reduced conservatism
- True optimization by combining MISI, advanced technologies, and live integrity monitoring
This final stage is where RBI becomes not just efficient, but also strategically effective, providing informed decision-making, long-term planning, and regulatory confidence.
MISI in Action
Organizations applying MISI have reported significant, quantifiable benefits:
- 30% reduction in intrusive inspections using RBI
- 20% of vessels cleared via NII
- 10% inspected with robotic technology, avoiding human entry altogether
- Up to 50% cost savings and 35 fewer turnaround days
- Over 100 confined space entries avoided
These gains are achieved by eliminating unnecessary inspections, optimizing intervals, and moving more tasks outside critical turnaround periods.
NII at Elevated Temperatures: A Game-Changer
One of the standout capabilities of MISI is its support for online inspections during production, even at high temperatures. Using advanced NDT techniques like TOFD and PAUT, inspections can now detect and monitor cracks, corrosion, and weld quality without shutting down operations.
This has several benefits:
- Authorities can validate integrity while the plant is running
- Turnarounds can be postponed or shortened
- Operators get advanced warnings of degradation, enabling proactive maintenance
- Welds with historical issues (“golden welds”) can be monitored continuously, reducing the risk of repair during high-stakes periods
The techniques have been successfully used in tough, high-temperature conditions, on thick-walled vessels, exchangers, and nozzles showing they still work well even when things get really hot.
Permanent Monitoring: Live Insight Without Shutdowns
Beyond inspections, MISI also supports permanent wall thickness monitoring through technologies like hotsense UT sensors. These sensors operate in extreme temperature conditions and can be installed under insulation offering:
- Real-time insight into wall thinning and corrosion rates
- Reduced need for manual inspections
- Better planning for replacements or intervention
- Seamless integration into plant monitoring systems
This is especially valuable for high-risk processes where even a small delay in identifying damage can lead to costly consequences.
MISI is A Practical Step Forward in Inspection
MISI offers a clear, structured way to improve inspection planning and execution. By using risk-based data and modern inspection methods like NII and robotics, teams can reduce unnecessary work while maintaining safety and compliance.
Reliability demands rise and regulatory pressure increases, maturing your RBI strategy with approaches like MISI helps ensure inspections are efficient, targeted, and justifiable. It’s a practical way to move from traditional intrusive inspections to smarter, safer, more effective practices.