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Pipefitting Trade Math 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.

Read the first 7 Pipefitting Trade Math flashcards as text

  1. Using the rolling offset formula, if the horizontal offset is 9 inches and the vertical offset is 12 inches, what is the true offset?

    Answer: 15 inches

    True offset = √(9² + 12²) = √(81 + 144) = √225 = 15 inches.

  2. A 22.5° elbow has a center-to-face dimension of 2 inches. What multiplier is used to find travel from offset?

    Answer: 2.613

    The travel multiplier for a 22.5° offset is 2.613 (the cosecant of 22.5°).

  3. How many threads per inch are on a 2-inch NPT pipe fitting?

    Answer: 11.5 TPI

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

  4. A pipe hanger is to be spaced at 10-foot intervals along a 200-foot horizontal run. How many hangers are needed?

    Answer: 21

    A 200-foot run at 10-foot spacing needs hangers at 0, 10, 20, ... 200 ft = 21 hangers.

  5. A pipe nipple is 6 inches long overall (end-to-end). If each threaded end engages 3/4 inch, what is the center-to-center dimension when installed between two threaded fittings?

    Answer: 4.5 inches

    Center-to-center = nipple length minus both thread engagements: 6 − 0.75 − 0.75 = 4.5 inches.

  6. If a pipe has a pitch of 1/8 inch per foot (fall), how much does a 48-foot run drop in elevation?

    Answer: 6 inches

    Total drop = 48 ft × 1/8 in/ft = 6 inches.

  7. A pipe flange bolt circle has a diameter of 11.75 inches and requires 8 equally spaced bolts. What is the arc length between bolt holes?

    Answer: 4.62 in

    Arc length = (π × D) / n = (3.1416 × 11.75) / 8 ≈ 4.62 inches.