What is the recommended maximum leakage rate for this type of test?

What is the recommended maximum leakage rate for this type of test?

• A. 240 gallons per inch O.D./mile/day of pipe
• B. 200 gallons per inch O.D./mile/day of pipe
• C. 260 gallons per inch O.D./mile/day of pipe
• D. 320 gallons per inch O.D./mile/day of pipe

Answer: (A)

The key idea is understanding how leakage is measured in a sewer test and why it’s scaled per inch of pipe diameter and per mile of length. In practice, leakage allowances are given as gallons per inch of outside diameter per mile per day so you can compare different pipe sizes and lengths on an equal footing. For this test type, the recommended maximum is 240 gallons per inch of outside diameter per mile per day. That means, for every inch of pipe diameter over each mile of line, you’re allowed to lose up to 240 gallons per day during the test. For example, a 12-inch pipe used for 2 miles would have a permitted leakage of 240 × 12 × 2 = 5,760 gallons per day. If the test shows more leakage than that, it would exceed the standard limit and indicate a problem with joints or material. The other numbers aren’t the standard allowance used in this context, which is why 240 is the best choice.

The key idea is understanding how leakage is measured in a sewer test and why it’s scaled per inch of pipe diameter and per mile of length. In practice, leakage allowances are given as gallons per inch of outside diameter per mile per day so you can compare different pipe sizes and lengths on an equal footing. For this test type, the recommended maximum is 240 gallons per inch of outside diameter per mile per day. That means, for every inch of pipe diameter over each mile of line, you’re allowed to lose up to 240 gallons per day during the test.

For example, a 12-inch pipe used for 2 miles would have a permitted leakage of 240 × 12 × 2 = 5,760 gallons per day. If the test shows more leakage than that, it would exceed the standard limit and indicate a problem with joints or material.

The other numbers aren’t the standard allowance used in this context, which is why 240 is the best choice.