RBI (API 580/581) prioritizes inspection intervals based on probability of failure (PoF) and consequence of failure (CoF). Instead of fixed intervals (e.g., 5 years), RBI allows extended runs for low-risk items (e.g., nitrogen service) and shorter, more rigorous inspections for high-risk (e.g., hydrogen reformers). It saves cost and reduces unnecessary shutdowns.

In the oil and gas, petrochemical, and power generation industries, "static equipment" refers to non-moving machinery such as pressure vessels, heat exchangers, storage tanks, and piping systems. Unlike rotating equipment (pumps, compressors), which fails due to wear and friction, static equipment faces a unique set of challenges related to corrosion, pressure containment, and material integrity.

In a counter-current heat exchanger, temperature cross occurs when the cold fluid outlet temperature exceeds the hot fluid outlet temperature. Why it's "Bad" (but not prohibited): It is physically possible, but it requires extremely long exchangers or multiple shells in series (1-2 exchanger cannot handle a true cross). If you see a temperature cross in a single shell, the LMTD correction factor (F) drops below 0.8, making the design unstable and inefficient. Pro answer: "We solve this by using a series arrangement or a true counter-current design like a double-pipe or spiral exchanger."

Would you like a or sample interview role-play (interviewer vs. candidate) for these static equipment paper documentation questions?

During an audit, you find a missing hydrotest certificate for a 5-year-old vessel. What do you do? A: