Practice Test Geeks(API) American Petroleum Institute Certification Practice Test
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API Pressure Vessels & Storage Tank Standards Flashcards

6 cards from real API practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. API Standard 620 differs from API Standard 650 in that API 620 covers tanks designed for:

    Answer: Low-pressure service up to 15 psig, including cryogenic and refrigerated storage

    API Std 620 applies to large welded low-pressure storage tanks (up to 15 psig) including those used for refrigerated or cryogenic service, which API 650 does not cover.

  2. Under ASME Section VIII Division 1, the required hydrostatic test pressure for a new pressure vessel is typically:

    Answer: 1.3 times the maximum allowable working pressure (MAWP)

    ASME VIII Div. 1 requires a hydrostatic test at 1.3× MAWP (adjusted for material strength at test vs. design temperature) to verify structural integrity.

  3. API RP 579-1/ASME FFS-1 'Fitness-For-Service' assessments are used to:

    Answer: Evaluate whether equipment with known damage or flaws can continue safe operation

    API 579/ASME FFS-1 provides assessment procedures to determine if pressure equipment with corrosion, cracks, or other damage remains fit for continued service.

  4. In API Std 650, a 'floating roof' tank design is primarily used to:

    Answer: Minimize evaporative VOC losses from volatile petroleum products

    Floating roofs rise and fall with the liquid level, eliminating the vapor space above the liquid surface and dramatically reducing evaporative emissions.

  5. What is the purpose of an 'annular plate' in an API 650 aboveground storage tank?

    Answer: To provide a wider bottom plate at the shell-to-floor junction for stress distribution

    The annular plate (bottom ring plate) is a wider plate at the shell-to-floor junction that distributes the shell load and resists stress concentration at this critical area.

  6. According to API 510, the 'remaining life' calculation for a pressure vessel in corrosive service is determined by:

    Answer: Dividing the measured corrosion allowance remaining by the corrosion rate

    Remaining life equals the remaining corrosion allowance (measured thickness minus minimum required thickness) divided by the measured or estimated corrosion rate.