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Pipefitting Math and Calculations 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. A pipe drops 3 inches over a 10-foot horizontal run. What is the slope expressed as inches per foot?

    Answer: 0.30 in/ft

    Slope = 3 inches ÷ 10 feet = 0.30 inches per foot.

  2. How many threads per inch (TPI) are on a 2-inch NPT pipe thread?

    Answer: 11.5 TPI

    2-inch NPT pipe threads have 11.5 threads per inch per the ASME B1.20.1 standard.

  3. What is the circumference of a pipe with an outside diameter of 10.75 inches (10-inch nominal)?

    Answer: 33.77 inches

    Circumference = π × OD = 3.1416 × 10.75 ≈ 33.77 inches.

  4. A 5-piece equal-spread 45° offset uses 4 fittings and covers a 24-inch set. What is the spread between each fitting center?

    Answer: 6 inches

    In a 5-piece equal-spread offset with 4 fittings, each fitting covers 24 ÷ 4 = 6 inches of set.

  5. A hydrostatic test requires pressurizing a system to 1.5 times the design pressure of 400 psig. What is the test pressure?

    Answer: 600 psig

    Test pressure = 1.5 × 400 psig = 600 psig, which is the standard hydrostatic test multiplier.

  6. The flow velocity in a 3-inch pipe (ID = 3.068 in) is 8 ft/s. If the pipe transitions to a 6-inch pipe (ID = 6.065 in), what is the approximate velocity in the larger pipe?

    Answer: 2.0 ft/s

    Using continuity (A₁V₁ = A₂V₂): area ratio ≈ (3.068/6.065)² ≈ 0.256, so V₂ ≈ 8 × 0.256 ≈ 2.05 ft/s.

  7. A pipefitter calculates that 3 inches of pipe is needed per degree of bend on a 2-inch pipe. How long a pipe section is needed to fabricate a 30° bend?

    Answer: 90 inches

    Required length = 3 inches/degree × 30 degrees = 90 inches of pipe.