Risk Based Work Selection (RBWS) is a work process that has been used in industry for >20 years by some owner-operators, however; it remains a little known process industry wide. In recent years there has been an increasing awareness of and interest in RBWS as owner-operators have focused on reducing cost and duration of Turnarounds while maintaining safe and reliable operation. Our experience has shown that a reduction in the overall TA work scope of approximately 20% is routinely accomplished.
RBWS is a multi-discipline work process that includes all key stakeholders in the TA, Operations and the Subject Matter Experts (SME) from individual equipment disciplines. The intent of the RBWS is to determine if there is risk based justification (H/S/E or Financial) to complete the worklist item during the TA. A threshold for unacceptable H/S/E risks is determined by the Site using a Risk Matrix. For discretionary items (Financial Risk only) a Benefit to Cost threshold or “Hurdle Rate” is set to ensure an adequate return on investment and that a cost effective solution has been chosen. Hurdle rates typically increase after the worklist freeze date as the time for planning decreases.
In order to justify items it must first be determined that they cannot be done outside of TA. Once this is completed the worklist items are reviewed to determine what failure they are intended to prevent from occurring. Typically the timeframe considered is the run length between turnarounds.
The consequence and probability of the failure is then determined with input from the team and combined on the Risk Matrix to determine the Risk Level. When RBWS is used with Fixed Equipment, it can utilize RBI data to validate or reject TA tasks that are included in the TA Work List (WL). RBI assessments focus on equipment integrity and loss of containment, while the RBWS methodology supplements these assessments with consideration of operational failures in vessel internals which may cause an unplanned outage, and impact on equipment performance.
Methodology for assessing risks can vary from qualitative to quantitative. Becht’s methodology is semi-quantitative which provides teams with a structured process that produces consistent results without too burdensome an amount of data required. When Risk levels are assigned to each item it allows owner-operators to make informed decisions on what is “In” and what is “Out” of the Turnaround Scope.
The end product of an RBWS is a justified worklist that will help the organization meet its turnaround and reliability goals.
Becht’s Background on RBWS
Our Teams have conducted Risk Based Work Selection Reviews for Turnarounds in North America and internationally for over 12 years. We have helped owner-operator organizations successfully execute Turnarounds by removing or deferring tens of millions of dollars of unjustified work from turnaround scopes. We provide expert facilitation tailored to the make-up of each TA Worklist and can supply on-site data collection resources to help ensure the client is prepared for a successful and efficient RBWS Workshop. We execute RBWS using a custom built software STRAITS (Strategic Tool for Risk Assessment for Improving Turnaround Scopes).