Journeyman Plumber ExamPlumbing Code and RegulationsHard
A journeyman plumber is replacing a section of 2-inch diameter cast iron drainage pipe with PVC pipe in an existing commercial building. According to the Uniform Plumbing Code (UPC), what is the maximum horizontal spacing required for supports for this 2-inch PVC drainage pipe?
- A4 feet
- B3 feet
- C2 feet
- D5 feet
Show answer & explanationAnswer & explanation
Correct answer: A. 4 feet
The Uniform Plumbing Code (UPC) specifies a maximum horizontal support spacing of 4 feet for PVC drainage pipe. This is a common code requirement to prevent sagging and maintain proper slope.
Why the other options are wrong
- B. 3 feet is common for some other materials or smaller sizes, but not 2-inch PVC drainage.
- C. 2 feet is typically for smaller diameter CPVC or PEX, not 2-inch PVC drainage.
- D. 5 feet is typically for larger diameter PVC or other more rigid materials like cast iron or steel.
PVC Drainage Pipe Support Spacing (UPC)
The maximum horizontal distance between supports for PVC drainage piping, as mandated by the Uniform Plumbing Code, to prevent sagging and ensure structural integrity.
- Supports prevent pipe deflection and maintain critical slope.
- Spacing varies by pipe material, diameter, and whether it's horizontal or vertical.
- UPC typically specifies 4 feet for horizontal PVC drainage pipes.
Memory trick: PVC drainage needs a four-foot hug.