Practice Test Geeks(SPED) Society of Piping Engineers and Designers Certification Practice Test
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Materials Selection & Specification Flashcards

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  1. When piping specifications call for 'killed steel,' what process has been performed during steelmaking?

    Answer: Oxygen has been removed with deoxidizers such as aluminum or silicon before casting

    Killed steel is fully deoxidized using aluminum, silicon, or other deoxidizers, preventing gas evolution during solidification and producing a more uniform, sound ingot.

  2. Which piping material is classified as Category M fluid service under ASME B31.3 and requires special consideration?

    Answer: Flammable fluid that vaporizes rapidly and is highly toxic upon release

    Category M in ASME B31.3 designates fluids where a single leak could cause irreversible harm to persons on exposure, requiring stricter design, fabrication, and examination requirements.

  3. What is the primary advantage of using Alloy 625 (Inconel 625) for piping in offshore subsea applications?

    Answer: Outstanding resistance to seawater corrosion, pitting, and crevice corrosion

    Alloy 625's high molybdenum (≈9%) and chromium (≈22%) content give it exceptional resistance to seawater pitting and crevice corrosion in subsea environments.

  4. For a piping system handling concentrated sulfuric acid (>93%) at ambient temperature, which material is typically most suitable?

    Answer: Carbon steel

    Concentrated sulfuric acid (>93%) passivates carbon steel by forming a protective iron sulfate layer, making carbon steel the standard economic choice for this service.

  5. Which examination method is most effective for detecting subsurface planar defects (such as lack of fusion) in butt welds of alloy steel piping?

    Answer: Radiographic testing (RT) or phased array ultrasonic testing (PAUT)

    Radiography and phased array UT are volumetric methods capable of detecting internal planar discontinuities such as lack of fusion, while PT and MT only reveal surface-breaking defects.

  6. A designer specifies ASTM A105 forgings for flanges. What comparable ASME Boiler and Pressure Vessel Code designation would appear on the material test report for pressure piping?

    Answer: SA-105

    ASME adopts ASTM specifications with the prefix 'SA-' rather than 'A-'; SA-105 is the ASME equivalent of ASTM A105 for carbon steel forgings.

  7. When selecting pipe material for a system containing hydrochloric acid (HCl) at 10% concentration and 100°F, which material provides the best corrosion resistance?

    Answer: Hastelloy C-276 or rubber-lined carbon steel

    Dilute HCl attacks both carbon steel and stainless steels aggressively; Hastelloy C-276 or non-metallic-lined systems are required for acceptable corrosion rates.