4 - Corrosion Under insulation (CUI)

Question 1

Corrosion of piping, pressure vessels and structural components resulting from water trapped under
insulation or fireproofing.

Answer 1

Corrosion Under Insulation (CUI)

Question 2

CUI affects equipments, that are in intermittent service or operate between:

Answer 2

• Intermittent service or operate between:
• 10°F and 350°F for CS
• 140ºF and 400ºF for SS & DSS

Question 3

CUI Corrosion rates increase with increasing metal temperature up to the point where the ,,,,,,

Answer 3

water evaporates quickly

Question 4

For insulated components, CUI becomes more severe at metal temperatures between the boiling point ,,,,,,

Answer 4

212°F and 350°F