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Quality Control Procedures Flashcards

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Read the first 7 Quality Control Procedures flashcards as text

  1. Which of the following is a key requirement when calibrating a pressure gauge used for hydrostatic testing?

    Answer: Calibration to a standard traceable to NIST

    Test instruments must be calibrated against standards traceable to NIST (National Institute of Standards and Technology) to ensure measurement accuracy.

  2. In a piping QC program, what is the purpose of a 'witness point' as opposed to a 'hold point'?

    Answer: Witness points allow work to proceed if the inspector does not attend; hold points do not

    A witness point notifies the inspector, but work can continue if the inspector chooses not to attend, unlike a hold point which mandates a stop.

  3. What minimum preheat temperature is typically required for P1 (carbon steel) pipe over 1 inch thick before welding per ASME B31.1?

    Answer: 150°F (65°C)

    ASME B31.1 requires a minimum preheat of 150°F for carbon steel pipe with wall thickness exceeding 1 inch to prevent hydrogen cracking.

  4. Which document defines the acceptable weld quality criteria that an inspector must use on a project?

    Answer: Quality Control Plan (QCP)

    The Quality Control Plan (QCP) defines inspection methods, acceptance criteria, hold points, and documentation requirements for the project.

  5. What action is required when a pipe spool fails a hydrostatic test due to a weeping flange gasket?

    Answer: Replace the gasket, re-assemble, and re-test

    Any leakage during a hydrostatic test requires repair (gasket replacement), re-assembly, and a full re-test to confirm integrity.

  6. A radiograph shows incomplete fusion at the root of a butt weld. Under ASME B31.1, this indication is:

    Answer: Rejectable regardless of size

    Incomplete fusion is a rejectable condition under ASME B31.1 regardless of size because it represents a planar defect that can propagate under cyclic loading.

  7. Why is it important to document ambient temperature during field hydrostatic testing of carbon steel pipe?

    Answer: To ensure water temperature does not cause brittle fracture in the pipe

    Carbon steel can become brittle at low temperatures; testing below the minimum allowable test temperature risks brittle fracture during pressurization.