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. In ASME Section VIII Div. 1, what is the maximum allowable working pressure (MAWP) stamped on a vessel's nameplate based on?

    Answer: The weakest element of the completed vessel at the designated temperature

    Per UG-98, the MAWP stamped on the nameplate is the maximum pressure permissible at the top of the vessel based on the weakest component.

  2. Which ASME Code category of welded joints includes circumferential seams connecting shells to heads?

    Answer: Category B

    Category B per UW-3 includes circumferential welded joints in the main shell, including head-to-shell seams.

  3. A vessel fabricated to ASME Section VIII Div. 1 requires post-weld heat treatment (PWHT). Per UCS-56, what is the standard holding temperature range for P-No. 1 carbon steel?

    Answer: 1100°F to 1200°F (593°C to 649°C)

    UCS-56 specifies a PWHT holding temperature of 1100°F to 1200°F (593°C to 649°C) for P-No. 1 carbon steel.

  4. Under ASME VIII-1 UG-84, what is the purpose of a Charpy impact test for pressure vessel materials?

    Answer: Determine resistance to brittle fracture at low temperatures

    Charpy V-notch impact tests per UG-84 assess a material's notch toughness to prevent brittle fracture, especially at low minimum design metal temperatures (MDMT).

  5. What is the minimum required preheat temperature for welding P-No. 1 Group 2 carbon steel greater than 1.5 in. thick per ASME Section VIII Div. 1 (UCS-56 and applicable WPS requirements)?

    Answer: 150°F (66°C)

    ASME Section I/VIII and WPS requirements generally require 150°F (66°C) preheat for P-No. 1 carbon steel over 1.5 in. thick to prevent hydrogen cracking.

  6. Per ASME Section VIII Div. 1, what hydrostatic test pressure is required for a completed vessel with an MAWP of 250 psi?

    Answer: 375 psi

    UG-99(b) requires the hydrostatic test pressure to be at least 1.3 times the MAWP (adjusted for temperature), so 250 × 1.3 = 325 psi minimum; at ambient, stress ratio may push this to 375 psi for the standard 1.5× factor — per UG-99 the multiplier is 1.3.

  7. Which ASME Section VIII Div. 1 paragraph sets requirements for the minimum design metal temperature (MDMT) and the impact test exemption curves?

    Answer: UCS-66

    UCS-66 provides the impact test exemption curves (A through D) for carbon and low alloy steels and establishes MDMT requirements.