Practice Test Geeks(API 510) Certified Pressure Vessel Inspector Practice Test
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Pressure Vessel Design & Fabrication Standards Flashcards

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  1. A torispherical (flanged and dished) head is being designed per ASME VIII-1 UG-32(e). What is the crown radius (L) used in the minimum thickness formula?

    Answer: Equal to the inside diameter of the shell

    Per UG-32(e), for a standard torispherical head, the crown radius L shall not be greater than the outside diameter of the skirt, and for a standard head equals the shell inside diameter.

  2. Per ASME Section VIII Div. 1, what is the minimum shell thickness (excluding corrosion allowance) allowed for pressure vessels under internal pressure?

    Answer: 1/16 in. (1.6 mm)

    UG-16(b) specifies that, except for certain heat exchanger tubes, no shell or head shall be less than 1/16 in. (1.6 mm) thick after forming.

  3. In ASME Section VIII Div. 1 fabrication, what is the maximum allowable out-of-roundness (peaking/banding) for a cylindrical shell per UG-80?

    Answer: The difference between max and min diameters shall not exceed 1% of nominal diameter

    UG-80 requires that the difference between maximum and minimum inside diameters at any cross-section shall not exceed 1% of the nominal inside diameter.

  4. Which ASME Section VIII Div. 1 table provides the allowable stress values (S) for carbon and low alloy steel materials used in vessel design calculations?

    Answer: Table UCS-23

    Table UCS-23 (Section II Part D) lists the maximum allowable stress values for carbon and low alloy steel materials used in VIII-1 pressure vessel design.

  5. A nozzle reinforcement calculation per ASME VIII-1 UG-37 is required to show that the area removed by the opening is replaced within a defined reinforcement zone. What width defines the reinforcement zone on each side of the nozzle centerline?

    Answer: The inside diameter of the opening (d)

    Per UG-40, the reinforcement zone width on each side of the nozzle axis equals the larger of the nozzle inside diameter (d) or (Rn + tn + t) but the basic zone half-width is d, the finished inside diameter of the opening.

  6. According to ASME Section VIII Div. 1, which Code paragraph governs the use of pneumatic testing as an alternative to hydrostatic testing?

    Answer: UG-100

    UG-100 permits pneumatic testing when hydrostatic testing is not practical, requiring a test pressure of at least 1.1 times the MAWP with added safety precautions.

  7. What does the 'U' stamp on a pressure vessel signify under ASME Section VIII Div. 1?

    Answer: The vessel was fabricated under a Quality Control system certified by ASME

    The ASME 'U' stamp certifies that the pressure vessel was designed and fabricated in accordance with ASME Section VIII Div. 1 under an authorized quality control system.