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Quality Control and Materials Flashcards

7 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 7 Quality Control and Materials flashcards as text

  1. What is the significance of the 'P-number' system used in ASME Section IX and referenced by API welding standards?

    Answer: It groups base metals with similar weldability to reduce required procedure qualifications

    P-numbers group base metals by chemical composition and mechanical properties so that one WPS can qualify welding of all metals in the same group.

  2. A quality inspector observes laminations in a steel plate during ultrasonic examination. Laminations are best described as:

    Answer: Planar discontinuities parallel to the plate surface caused during rolling

    Laminations are internal, planar defects parallel to the plate surface that originate from non-metallic inclusions elongated during the rolling process.

  3. Per API quality requirements, how often must calibration of measuring and test equipment (M&TE) be verified?

    Answer: At intervals established in the quality program to maintain accuracy

    API quality systems require M&TE to be calibrated at defined intervals traceable to national standards to ensure measurement accuracy.

  4. What type of weld discontinuity is characterized by incomplete fusion between the weld metal and the base metal at the root of the joint?

    Answer: Lack of root fusion (incomplete penetration)

    Incomplete root penetration or lack of root fusion occurs when the weld metal does not fully fuse with the base metal at the root, creating a planar defect.

  5. In API storage tank construction (API 650), what is the purpose of a radiographic examination of weld seams?

    Answer: To detect internal discontinuities such as porosity, slag, and cracks

    Radiographic testing (RT) uses X-rays or gamma rays to reveal internal weld defects on film or digital media for evaluation.

  6. Which API document provides recommended practice for inspection of in-service pressure vessels?

    Answer: API 510

    API 510 covers inspection, repair, alteration, and rerating of in-service pressure vessels in the petroleum and chemical industries.

  7. When conducting a hydrostatic pressure test on a pipeline, the test pressure is typically set at what ratio relative to the maximum allowable operating pressure (MAOP)?

    Answer: 1.1 to 1.5 times MAOP, depending on the applicable code

    Most pipeline codes require hydrostatic test pressure between 1.1× and 1.5× MAOP, with the specific multiplier depending on design code and location class.