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. According to ASME Section VIII Div. 1, what is the minimum required thickness formula for a cylindrical shell under internal pressure (thin-wall approximation)?

    Answer: t = PR / (SE - 0.6P)

    ASME VIII-1 UG-27(c)(1) gives t = PR / (SE - 0.6P) for longitudinal joint stress in cylindrical shells.

  2. What joint efficiency (E) applies to a Type 1 butt weld that has received full radiographic examination per ASME Section VIII Div. 1?

    Answer: 1.00

    A Category A Type 1 butt weld with full RT per UW-11(a) receives a joint efficiency of 1.00.

  3. Under ASME Section VIII Div. 1, which UG paragraph governs the design of formed heads under internal pressure?

    Answer: UG-32

    UG-32 covers the required thickness of formed heads (ellipsoidal, torispherical, hemispherical, conical) under internal pressure.

  4. A 2:1 semi-ellipsoidal head under internal pressure is being designed per ASME VIII-1. What is the correct head factor (K) used in the thickness formula for a standard 2:1 ellipsoidal head?

    Answer: 1.0

    For a standard 2:1 ellipsoidal head, the factor K equals 1.0 per UG-32(d), simplifying the formula to t = PD / (2SE - 0.2P).

  5. Which ASME Section VIII Div. 1 paragraph requires that all pressure vessels be provided with at least one pressure-relieving device?

    Answer: UG-125

    UG-125 mandates that every pressure vessel must be protected by at least one pressure-relieving device.

  6. What does the designation 'SA-516 Gr. 70' indicate for a pressure vessel shell plate?

    Answer: ASTM plate steel with 70,000 psi minimum ultimate tensile strength

    SA-516 Grade 70 is an ASME-accepted carbon steel plate with a minimum tensile strength of 70,000 psi, commonly used for pressure vessel fabrication.

  7. Per ASME Section VIII Div. 1, a vessel designed for external pressure must be checked for what primary failure mode?

    Answer: Elastic or inelastic buckling (collapse)

    External pressure design per UG-28 and UG-33 primarily guards against elastic or inelastic buckling (collapse) of the shell.