FREE Certified Pipefitter Pipefitting Math and Calculations Questions and Answers

Question 1

A pipefitter needs to install a simple offset using two 45-degree fittings.
The required offset distance (Set) is 20 inches.
What is the center-to-center travel distance of the pipe connecting the two fittings?

Accepted Answer

28.28 inches

Answer

20 inches

Answer

24.14 inches

Answer

34.64 inches

Question 2

A pipe run of 80 feet needs to be installed with a uniform grade of 1/4 inch per foot for proper drainage. What is the total fall of the pipe over the entire run?

Accepted Answer

1 foot, 8 inches

Answer

2 feet

Answer

20 feet

Answer

1 foot, 4 inches

Question 3

A pipefitter is fabricating a rolling offset. The horizontal offset (or 'spread') is 12 inches and the vertical offset (or 'rise') is 16 inches. What is the true offset length?

Accepted Answer

20 inches

Answer

28 inches

Answer

18 inches

Answer

22 inches

Question 4

When calculating the required cut length of a pipe to be installed between two 6-inch, 90-degree, long-radius butt-weld elbows, what critical dimension must be subtracted from the center-to-center measurement?

Accepted Answer

The take-off dimension for each fitting.

Answer

The outside diameter of the pipe.

Answer

The wall thickness of the fittings.

Answer

The circumference of the pipe.

Question 5

A piping system requires an equal spread offset using two 45-degree fittings. The spread (center-to-center distance between the parallel pipes) is 10 inches. Which of the following calculations determines the 'extension' piece length required to maintain the equal spread?

Accepted Answer

Spread x 0.414

Answer

Spread x 1.414

Answer

Spread / 1.414

Answer

Spread + 1.414

Question 6

A pipefitter needs to calculate the travel for a rolling offset that uses 45-degree fittings. The horizontal offset is 15 inches and the vertical rise is 20 inches. What is the correct sequence of calculations?

Accepted Answer

Calculate √(Rise² + Offset²), then multiply the result by 1.414.

Answer

Add rise and offset, then multiply by 1.414.

Answer

Multiply rise by 1.414, multiply offset by 1.414, then add the results.

Answer

Calculate √(Rise + Offset), then multiply the result by 1.414.

A pipefitter needs to install a simple offset using two 45-degree fittings.The required offset distance (Set) is 20 inches.What is the center-to-center travel distance of the pipe connecting the two fittings?

A pipefitter needs to install a simple offset using two 45-degree fittings.
The required offset distance (Set) is 20 inches.
What is the center-to-center travel distance of the pipe connecting the two fittings?