Journeyman Plumber ExamPlumbing Code and RegulationsMedium
A plumber is performing a rough-in inspection for a new residential dwelling. The inspection includes confirming that all required cleanouts are correctly installed. According to the International Plumbing Code (IPC), what is the maximum distance a cleanout can be located from the upstream end of a horizontal drainage pipe?
- A100 feet (30.5 meters)
- B20 feet (6.1 meters)
- C75 feet (22.9 meters)
- D50 feet (15.2 meters)
Show answer & explanationAnswer & explanation
Correct answer: D. 50 feet (15.2 meters)
The IPC states that cleanouts shall be provided at intervals not to exceed 50 feet in horizontal drainage pipes, measured from the upstream end of the pipe.
Why the other options are wrong
- A. 100 feet is significantly longer than the permitted maximum cleanout interval.
- B. 20 feet is too short for the maximum interval; typically for changes in direction.
- C. 75 feet is too long for the maximum interval between cleanouts.
Drainage Cleanout Spacing
The maximum permissible distance between cleanouts on horizontal drainage piping to ensure adequate access for clearing blockages.
- Required by plumbing codes (IPC, UPC).
- Ensures accessibility for maintenance.
- Specific distances apply to different pipe sizes and locations.
Memory trick: Fifty Feet to Find the Flow!