Heat Exchanger Fundamentals: Theory and Applications

A: A feels conservative because it respects the construction-to-operation boundary and avoids heating a dirty bundle. B sounds practical on schedule pressure, but heating before cleaning bakes debris onto tube walls and raises under-deposit corrosion risk. C appeals to corrosion engineers, yet hydrotesting after chemical clean reintroduces oxygenated water and debris unless the loop is perfectly controlled. D mirrors what people do when operations is impatient, but full cold flow before leak testing loads tube-to-tubesheet joints without proof of integrity.

A: A aligns with legal enforceability; auditors care what you committed to, not what changed later. B sounds safety-forward, but unilateral adoption without MOC alters scope and liability. C feels pragmatic, yet creates an undefined acceptance basis that fails traceability. D is common in procurement, though vendor stamps don’t override owner specs under COMAH scrutiny.

A: A is the quiet failure mode; PSV sizing protects pressure, not metal temperature. B is intuitive but the valve failed closed, isolating the header. C borrows from pump protection logic, yet check valves and hydraulics limit this case. D drifts into plant-wide scenarios unrelated to the initiating event.

A: A addresses the measurement chain; water tests live or die on ΔT accuracy. B jumps to design assumptions without validating test conditions. C is tempting if you distrust fabrication, but it’s invasive before basics are checked. D risks erosion and doesn’t explain whether the shortfall is real or an artifact.