Arizona Plumbing Practice Exam

Copper water tubing, 2 inches and larger, must be supported every ______ horizontally.

1. 5 feet

2. 10 feet

3. 15 feet

4. 20 feet

The correct answer is: 10 feet

Copper water tubing that is 2 inches in diameter and larger needs to be supported every 10 feet horizontally. This requirement is based on plumbing codes and standards which ensure the integrity and stability of the piping system. Proper support is crucial for preventing sagging, movement, and potential damage to the pipes, which can lead to leaks or other issues. The selection of 10 feet as the support interval allows for adequate stabilization to account for the weight of the pipeline, potential thermal expansion, and contractions due to temperature changes. Maintaining this distance helps protect the integrity of the joints and connections within the system. Support at greater intervals may not sufficiently prevent sagging and could lead to issues such as misalignment or increased stress on fittings. Therefore, the 10-foot distance is a common standard that balances practicality with structural needs in plumbing applications.