API 510 Pressure Vessel Design & Inspection Codes 4

Question 1

According to API 510, what is the maximum interval for internal or on-stream inspection of a pressure vessel?

Accepted Answer

10 years or half the remaining life, whichever is less

Answer

API 510 limits the internal inspection interval to the lesser of 10 years or half the calculated remaining corrosion life.

Question 2

A pressure vessel inspector calculates a corrosion rate of 10 mpy (mils per year) and measures a remaining corrosion allowance of 100 mils. What is the remaining life?

Accepted Answer

10 years

Answer

Remaining life = remaining corrosion allowance ÷ corrosion rate = 100 mils ÷ 10 mpy = 10 years.

Question 3

Under ASME VIII Division 1, nozzle reinforcement is required to compensate for:

Accepted Answer

The weakening effect of the opening cut in the vessel shell

Answer

Nozzle reinforcement replaces the load-carrying metal removed when an opening is cut in the shell, restoring the vessel's pressure-carrying capacity.

Question 4

According to API 510, what triggers a thickness measurement survey to establish a new corrosion rate?

Accepted Answer

When a vessel is moved to different service or when the previous corrosion rate is no longer valid

Answer

A new corrosion rate survey is triggered when service conditions change or when existing rate data is no longer representative of current service.

Question 5

In the context of API 510, what is meant by 'fitness-for-service' (FFS) assessment?

Accepted Answer

An engineering evaluation to determine if a vessel with known flaws can safely operate to the next inspection

Answer

FFS assessment is an engineering evaluation that determines whether a vessel with damage or flaws can continue safe operation until the next planned inspection or repair.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Pressure Vessel Design & Inspection Codes 4