API 510 Corrosion Mechanisms and Monitoring

Question 1

What is the most common form of deterioration in pressure vessels?

Accepted Answer

Corrosion from internal or external exposure

Answer

Vibration damage

Answer

UV degradation

Answer

Thermal shock

Question 2

What is the corrosion rate used for in API 510 inspections?

Accepted Answer

Calculating remaining life and determining next inspection interval

Answer

Insurance calculations only

Answer

Determining vessel color change

Answer

Marketing purposes

Question 3

What is corrosion under insulation (CUI)?

Accepted Answer

Corrosion occurring beneath external insulation due to trapped moisture

Answer

Insulation that causes noise

Answer

A type of internal corrosion

Answer

Decorative insulation wear

Question 4

Which inspection technique is most effective for detecting CUI without removing insulation?

Accepted Answer

Profile radiography or pulsed eddy current testing

Answer

Visual inspection

Answer

Hammer testing

Answer

Pressure testing

Question 5

What is the difference between general and localized corrosion?

Accepted Answer

General affects uniform areas while localized concentrates in specific spots

Answer

They are identical

Answer

General is worse than localized

Answer

Localized only occurs externally

Question 6

How are corrosion coupons used in pressure vessel monitoring?

Accepted Answer

As sacrificial samples installed inside the vessel to measure actual corrosion rates

Answer

As replacement parts

Answer

As decorative elements

Answer

As insulation material