Pressure Vessel Design & Inspection Codes Flashcards
7 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pressure Vessel Design & Inspection Codes flashcards as text
According to API 510, what is the maximum interval for internal or on-stream inspection of a pressure vessel?
Answer: 10 years or half the remaining life, whichever is less
API 510 limits the internal inspection interval to the lesser of 10 years or half the calculated remaining corrosion life.
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?
Answer: 10 years
Remaining life = remaining corrosion allowance ÷ corrosion rate = 100 mils ÷ 10 mpy = 10 years.
Under ASME VIII Division 1, nozzle reinforcement is required to compensate for:
Answer: The weakening effect of the opening cut in the vessel shell
Nozzle reinforcement replaces the load-carrying metal removed when an opening is cut in the shell, restoring the vessel's pressure-carrying capacity.
According to API 510, what triggers a thickness measurement survey to establish a new corrosion rate?
Answer: When a vessel is moved to different service or when the previous corrosion rate is no longer valid
A new corrosion rate survey is triggered when service conditions change or when existing rate data is no longer representative of current service.
In the context of API 510, what is meant by 'fitness-for-service' (FFS) assessment?
Answer: An engineering evaluation to determine if a vessel with known flaws can safely operate to the next inspection
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.
Which ASME Section covers the welding procedure and welder qualification requirements applicable to pressure vessel repairs?
Answer: ASME Section IX — Welding and Brazing Qualifications
ASME Section IX governs the qualification of welding procedures (WPS/PQR) and welders used in pressure vessel fabrication and repair.
What does ASME Section VIII Division 2 offer compared to Division 1 that allows thinner vessel walls?
Answer: More rigorous design-by-analysis rules and mandatory impact testing, with lower safety factors
Division 2 uses more rigorous analytical methods and tighter fabrication controls, permitting lower safety factors and resulting in thinner, lighter vessel walls.