API 580 Risk Based Inspection Practice Test 2025 - Free Risk Based Inspection Practice Questions and Study Guide

In the context of process units screening within Risk Based Inspection (RBI), the primary basis for ranking units is relative risk. This approach focuses on assessing the likelihood of failure and the potential consequences associated with that failure. By evaluating the risk associated with different units relative to one another, organizations can prioritize inspection efforts and resource allocation where they will be most effective in mitigating safety and operational risks.

Relative risk takes into account various factors, such as the severity of potential failures, the probability of those failures occurring, and the impact they would have on safety, environmental concerns, and operational efficiency. This method is essential for ensuring that the highest-risk units receive the most attention, allowing for a more strategic and effective risk management approach.

In contrast, while the size of a unit, estimated repair costs, and historical performance may provide useful information during the evaluation process, they are secondary factors. They do not directly address the core goal of RBI, which is to prioritize inspections based on risk. Thus, relative risk stands out as the fundamental metric for effective decision-making in this context.