What is the maximum distance apart that building sewer cleanouts should be installed in horizontal drainage lines for building sewers smaller than 8 inches?

• A. 50 feet
• B. 75 feet
• C. 100 feet
• D. 150 feet

Answer: (C)

For building sewer cleanouts in horizontal drainage lines, the maximum distance apart for pipes smaller than 8 inches is established to ensure that maintenance and access for blockages or repairs can be effectively managed. A distance of up to 100 feet between cleanouts is acceptable according to plumbing codes. This regulation facilitates easier maintenance as it allows for effective cleaning and inspection of the drainage system without compromising the system's efficiency.

Establishing cleanouts at specified intervals enables inspectors and plumbers to access and maintain the sewer line more conveniently. Cleanouts act as access points for equipment used to clear drains and inspect the internal pipe condition, thus preventing severe issues from developing.

While the other options suggest longer maximum distances, they exceed the limits set for smaller pipes. Sticking to a maximum of 100 feet ensures that the integrity and functionality of the sewage system are maintained, while also complying with recognized plumbing standards.