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.

Read the first 6 API Pressure Vessels & Storage Tank Standards flashcards as text

  1. API Standard 2510 provides design and construction guidance for:

    Answer: LPG (liquefied petroleum gas) installations at refineries and bulk plants

    API Std 2510 covers the design, installation, and operation of LPG storage and handling systems at refineries and bulk storage facilities.

  2. In pressure vessel design, 'weld joint efficiency' (E) affects the required wall thickness by:

    Answer: Increasing the required thickness when radiographic examination is not performed (lower E values)

    Lower weld joint efficiency (e.g., E=0.7 for spot-examined joints vs. E=1.0 for fully radiographed) requires greater wall thickness to maintain equivalent structural integrity.

  3. API RP 651 covers cathodic protection of aboveground petroleum storage tanks primarily to protect:

    Answer: The external tank bottom in contact with the foundation from soil-side corrosion

    API RP 651 addresses cathodic protection systems installed beneath AST floors to mitigate external corrosion from the soil/water environment under the tank.

  4. What does 'MAWP' stand for, and when is it determined for a pressure vessel?

    Answer: Maximum Allowable Working Pressure; determined after fabrication based on actual materials and construction

    MAWP is the Maximum Allowable Working Pressure, formally calculated after vessel fabrication accounting for actual head thickness, nozzle reinforcements, and material certifications.

  5. API Standard 653 (Tank Inspection, Repair, Alteration, and Reconstruction) requires that repairs to existing AST floors be evaluated against minimum thickness requirements based on:

    Answer: The actual measured thickness versus the minimum required thickness for the remaining service life

    API 653 requires ultrasonic thickness measurements compared to the calculated minimum required thickness, considering future corrosion, to determine repair scope and timing.

  6. Which type of pressure relief device is designed to open and reclose, protecting pressure vessels from temporary overpressure conditions?

    Answer: Spring-loaded pressure relief valve (PRV)

    Spring-loaded PRVs open automatically when pressure exceeds the set point and reclose when pressure returns below the set point, providing repeatable overpressure protection.