Certified Pipefitter Pipefitting Trade Math Questions and Answers

Question 1

A pipefitter needs to calculate the travel for a simple 45-degree offset. The 'set' is 36 inches and the 'run' is also 36 inches. What is the length of the travel piece?

Accepted Answer

50.9 inches

Answer

72 inches

Answer

36 inches

Answer

48.1 inches

Question 2

A pipe spool requires a single piece of 8-inch nominal pipe to be installed between the centers of two 90-degree long radius butt-weld elbows. If the center-to-center dimension between the elbows is 74 inches, what is the required cut length of the pipe?

Accepted Answer

62 inches

Answer

50 inches

Answer

74 inches

Answer

66 inches

Question 3

A pipefitter is fabricating a rolling offset where the vertical change ('set') is 9 feet and the horizontal change ('roll') is 12 feet. The horizontal distance ('run') of the pipe is 20 feet. What is the true travel length of the pipe?

Accepted Answer

25 feet

Answer

21 feet

Answer

15 feet

Answer

41 feet

Question 4

What is the approximate internal volume, in U.S. gallons, of a 50-foot long section of 6-inch Schedule 40 pipe?

Accepted Answer

59.4 gallons

Answer

149.5 gallons

Answer

73.3 gallons

Answer

91.7 gallons

Question 5

When laying out a three-piece 90-degree mitered turn using a 12-inch nominal pipe (OD = 12.75"), what is the correct cutback measurement for the miter cuts?

Accepted Answer

2.65 inches

Answer

5.29 inches

Answer

3.19 inches

Answer

6.38 inches

Question 6

A pipefitter needs to calculate the 'takeout' for a 10-inch nominal, long radius, 45-degree butt-weld elbow. Which of the following calculations is correct?

Accepted Answer

tan(22.5) * 1.5 * 10 inches

Answer

1.5 * 10 inches

Answer

0.625 * 10 inches

Answer

tan(45) * 1.5 * 10 inches