What is the minimum pipe size that requires hangers to be adjusted over?

The correct answer is based on plumbing and pipefitting codes, which specify that hangers must be adjusted to support pipes of certain sizes adequately. In Massachusetts, for many plumbing and mechanical systems, pipes that are 2 1/2 inches in diameter and larger require specific support provisions. This is due to factors such as the weight of the pipe, the materials being transported, and the overall longevity and safety of the installation.

In environments where pipes carry fluids (gas, liquid, etc.), using the appropriate hangers and supports becomes crucial, especially as the diameter increases. Pipelines that are too big can become unwieldy without proper support, leading to potential failures or issues down the line. Therefore, the regulation requiring that hangers be adjusted for pipes 2 1/2 inches and above serves to ensure that there is sufficient physical support to prevent sagging, stress, or breakage, thus maintaining system integrity. Smaller pipe sizes, such as those below 2 1/2 inches, typically don't necessitate this level of adjustment because they are lighter and easier to manage.