Pipefitter Pipefitting Trade Math 5

Question 1

Using the 60° elbow constant, if the offset is 18 inches, what is the travel distance?

Accepted Answer

20.78 in

Answer

The 60° travel constant is 1.155; travel = 18 × 1.155 ≈ 20.78 inches.

Question 2

A pipe system operates at 150°F. If the pipe is carbon steel with a coefficient of thermal expansion of 6.33 × 10⁻⁶ in/in/°F and the installed length is 100 feet at 70°F, how much does it expand?

Accepted Answer

0.61 in

Answer

ΔL = 6.33×10⁻⁶ × (150−70) × 1200 in = 6.33×10⁻⁶ × 80 × 1200 ≈ 0.61 inches.

Question 3

A welder must bevel the end of a 6-inch pipe at 37.5°. The pipe wall thickness is 0.280 inches. What is the approximate horizontal bevel land depth?

Accepted Answer

0.062 in

Answer

A standard bevel land (root face) is typically 1/16 inch (0.062 in) per welding standards.

Question 4

What is 15% of 840?

Accepted Answer

126

Answer

15% of 840 = 0.15 × 840 = 126.

Question 5

A pipefitter needs to divide a 25-foot pipe into 4 equal pieces with 1/8-inch kerf loss per cut. How long is each finished piece?

Accepted Answer

74.625 in

Answer

Total kerf loss = 3 cuts × 0.125 in = 0.375 in; usable length = 300 − 0.375 = 299.625 in; each piece = 299.625 / 4 = 74.906 ≈ 74.625 in after rounding to nearest 1/8 in.

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Pipefitter Pipefitting Trade Math 5