For which pipe diameter is the thread length noted as 2 1/8"?

The correct answer indicates that for a pipe diameter of 12 inches, the thread length is specified as 2 1/8 inches. This standard can be found in pipe threading specifications, which define the dimensions for various sizes of pipes.

In piping systems, the thread length often varies with the diameter of the pipe, and specific standards are established by organizations such as the American National Standards Institute (ANSI) and the American Society for Testing and Materials (ASTM). According to these standards, larger diameter pipes require shorter thread lengths than smaller ones, making the designation for a 12-inch pipe typically align with the 2 1/8 inches of thread length noted.

Understanding these standards is crucial for anyone working in plumbing or piping systems, as using the incorrect thread length can lead to issues with fittings and sealing joints, ultimately impacting the integrity and safety of the installation.