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

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

Read the first 7 Valve & Fitting Selection flashcards as text

  1. In ASME B16.5, what does the Class 300 pressure-temperature rating for a carbon steel flange signify?

    Answer: A pressure-temperature rating group that varies with temperature

    ASME B16.5 Class designations represent rating groups where the maximum allowable working pressure decreases as temperature increases, following published tables.

  2. Which type of valve disc design in a butterfly valve provides improved sealing performance at high differential pressures?

    Answer: Triple-offset disc

    Triple-offset butterfly valves use a conical seat geometry that produces zero friction during opening/closing, enabling tight metal-to-metal shutoff at high pressures.

  3. A fitting used to connect two pipes of different schedules (wall thicknesses) with the same nominal pipe size is called a:

    Answer: Swage nipple

    Swage nipples transition between different pipe schedules while maintaining the same nominal diameter, providing a smooth bore transition.

  4. For a valve in chlorine gas service, which packing material should be avoided due to attack by wet chlorine?

    Answer: Neoprene elastomer

    Neoprene (polychloroprene) and most elastomers are attacked by dry or wet chlorine gas, making PTFE or graphite-based packings the correct choice.

  5. What is the purpose of a spectacle blind (figure-8 blind) in a piping system?

    Answer: To provide visual confirmation of isolation or flow status between equipment

    A spectacle blind provides a permanent, positively isolating blind or spacer that can be flipped, with the open or blind position visually verifiable at the flange.

  6. Which fitting is used to close the open end of a female-threaded pipe fitting?

    Answer: Plug

    A plug has male external threads and is screwed into a female-threaded fitting to seal an open end.

  7. According to API 6D, what is the minimum required closure time for a 24-inch full-bore ball valve used in pipeline service?

    Answer: Slow-closing operation is preferred to prevent water hammer, with time defined per system analysis

    API 6D does not prescribe a single closure time; the pipeline engineer must determine the safe closure time based on surge pressure analysis for each specific system.