Arizona Plumbing Practice Exam

What is the maximum size of a pipe that copper water piping must be supported at every 6 feet?

1. 1 inch

2. 1-1/4 inch

3. 1-1/2 inch

4. 2 inch

The correct answer is: 1-1/2 inch

The maximum size of a pipe that requires support every 6 feet for copper water piping is based on the guidelines established by plumbing codes, which ensure that pipes are adequately supported to prevent sagging and potential damage. For copper pipes, specifically those with a diameter of 1-1/2 inches or less, the requirement is to provide support at intervals not exceeding 6 feet. This is crucial in maintaining the integrity of the piping system, especially given the weight of the water contained within and any potential pressure fluctuations. When examining the size specified in the correct choice, 1-1/2 inches fits within the regulatory framework that determines support intervals based on pipe diameter. Thus, since the requirement is focused on pipes with a diameter of 1-1/2 inches and smaller, they must be supported at every 6 feet to ensure durability and reliability. Larger pipe sizes, such as 2 inches, are governed by different support intervals, generally requiring support at shorter distances. Therefore, knowing the specific size limits and corresponding support requirements is essential in plumbing practices to comply with safety standards and ensure proper functionality.