Vessel Inspection

A: That's the trap — picking a side instead of stopping the job. Inspection sign-off relies on controlled documents agreeing, otherwise you can't verify reinforcement, PMI scope, or even the correct NDE extent. Assuming either document is right is how missed MOC items sneak through.

A: That's mixing damage mechanisms. The interval isn't about strength or PWHT history — it's about wet-dry cycling under insulation right around that temperature window, where evaporation concentrates salts. Field failures taught that lesson the hard way.

A: That's where people overthink it. First pass is linear unless you have chemistry or flow changes to justify curvature. 0.15 mm/year against 2.1 mm remaining gets you roughly 14 years, then you sanity-check against RBI later.

A: That's the easy one to miss because MAWP didn't move. Fatigue damage scales with cycles and stress range, not peak pressure, and nozzles concentrate it. Plenty of cracked attachments came from exactly this kind of control tweak.

A: That's the classic shortcut that gets people in trouble. ASME ties hydrotest pressure to allowable stress at test temperature, not a flat multiplier, so you scale MAWP before applying the 1.3 factor. Inspectors catch this when vessels look over-pressured on paper.

A: That's not about engineering pride, it's about legal rating. The nameplate is the certified limit in the field, and inspection has to respect it until an R-stamp or re-rating fixes the mismatch. Plenty of near-misses started with ignoring that plate.

A: That's confusing damage modes again. MDMT is about toughness, not strength or corrosion, and brittle fracture doesn't give warnings. Inspection flags it because one cold hydrotest can end the vessel’s life instantly.

A: That's where a quick ratio saves time. 15 mm over 3000 mm is about 0.5%, not nothing, not panic. You log it, check supports and vacuum cases, and see if it’s growing.

A: That's the one juniors miss because the shell still looks fine outside. Wet H2S drives hydrogen into the steel, and damage happens subsurface. Waiting for the next outage is how blisters turn into leaks.