Pipefitter Pipefitting Math and Calculations 2

Question 1

A pipe must travel 18 inches horizontally and 18 inches vertically. Using 45° elbows, what is the travel distance (center-to-center) along the offset pipe?

Accepted Answer

25.46 inches

Answer

18 inches

Answer

36 inches

Answer

12.73 inches

Question 2

What is the formula to calculate the circumference of a pipe for layout work?

Accepted Answer

C = π × D (3.1416 × outside diameter)

Answer

C = 2 × D

Answer

C = π × r² (3.1416 × radius squared)

Answer

C = D / π

Question 3

If a pipe run must drop 6 inches over a horizontal distance of 10 feet to achieve proper drainage slope, what is the slope expressed as a fraction per foot?

Accepted Answer

1/2 inch per foot

Answer

1/4 inch per foot

Answer

3/4 inch per foot

Answer

1 inch per foot

Question 4

What is the 'take-out' of a 90° long-radius elbow on a 4-inch NPS pipe (LR elbow center-to-face dimension)?

Accepted Answer

6 inches

Answer

3 inches

Answer

4 inches

Answer

8 inches

Question 5

A pipe flange has 8 bolt holes on a 9.5-inch bolt circle diameter (BCD). What is the spacing between adjacent bolt holes?

Accepted Answer

3.74 inches

Answer

1.19 inches

Answer

4.75 inches

Answer

2.36 inches

Question 6

What is the developed length of a 90° long-radius elbow fitting for a 3-inch NPS pipe?

Accepted Answer

7.07 inches

Answer

4.50 inches

Answer

14.14 inches

Answer

9.42 inches