How much drop is required for a 60-foot run of piping graded to 1/8 inch per foot?

• A. 6 inches
• B. 7.5 inches
• C. 8 inches
• D. 9 inches

Answer: (B)

To determine the amount of drop required for a 60-foot run of piping graded to 1/8 inch per foot, you need to calculate the total drop based on the given grade.

The grade of 1/8 inch per foot means that for every foot of run, there is a drop of 1/8 inch. Therefore, to find the total drop for 60 feet, you multiply the grade by the total length of the run:

Total drop = (1/8 inch) x (60 feet)

First, convert 1/8 inch into a decimal for easier multiplication:

1/8 = 0.125 inches

Now, perform the calculation:

Total drop = 0.125 inches/foot × 60 feet = 7.5 inches

This means that for a 60-foot length of piping with a grade of 1/8 inch per foot, a total drop of 7.5 inches is necessary to ensure proper drainage and flow.

Thus, the correct answer indicates the appropriate total drop required for this specific configuration of piping.