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Pipe Testing and Inspection Flashcards

7 cards from real PIPEFITTER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. According to ASME B31.3, what is the minimum hydrostatic test pressure for a process piping system?

    Answer: 1.5 times the design pressure

    ASME B31.3 requires hydrostatic test pressure to be at least 1.5 times the design pressure to verify system integrity.

  2. Why is water preferred over air as the test fluid in hydrostatic pressure testing?

    Answer: Water is incompressible, releasing less stored energy if a failure occurs

    Water is incompressible, so a failure during hydrostatic testing releases far less stored energy than a pneumatic failure, making it significantly safer.

  3. What is the minimum hold time at test pressure required by ASME B31.3 for a hydrostatic pressure test?

    Answer: 10 minutes

    ASME B31.3 specifies a minimum hold time of 10 minutes at test pressure to allow for thorough inspection and leak detection.

  4. Which non-destructive examination (NDE) method uses high-frequency sound waves to detect internal flaws in pipe welds?

    Answer: Ultrasonic testing (UT)

    Ultrasonic testing transmits high-frequency sound waves into the material; internal discontinuities reflect the waves, indicating the location and size of flaws.

  5. Under ASME B31.3, what is the minimum pneumatic test pressure when hydrostatic testing is not feasible?

    Answer: 1.1 times the design pressure

    ASME B31.3 requires pneumatic test pressure of at least 1.1 times the design pressure; the lower multiplier reflects the increased hazard of using compressed gas.

  6. What is the primary reason for venting high points in a piping system during hydrostatic pressure testing?

    Answer: To remove trapped air pockets that could cause inaccurate pressure readings

    Trapped air is compressible and can mask true system pressure readings or create a pneumatic hazard within an otherwise hydrostatic test.

  7. Which NDE method projects ionizing radiation through a weld to create an image showing internal defects on film or a digital detector?

    Answer: Radiographic testing (RT)

    Radiographic testing uses X-rays or gamma rays to penetrate the weld; variations in density caused by defects appear as shadows on the radiographic image.