For a 12" pipe in a 90° butt weld ell, what would the take-off be?

In the context of piping and fittings, the term "take-off" refers to the effective length of pipe that is taken from a fitting, in this case, a 90° butt weld elbow. The take-off dimension is crucial for planning and estimating material needs when installing or modifying piping systems.

For a 12" pipe fitting, specifically a 90° elbow, the take-off is based on the diameter of the pipe. Generally, the take-off length for a butt weld fitting is equivalent to the diameter of the pipe itself. Therefore, for a 12" elbow, the take-off will indeed be 12 inches.

This standardization exists to streamline installation and to ensure compatibility with the length of straight pipe sections that will eventually connect to the fitting. Understanding this concept helps pipefitters correctly estimate materials and remain compliant with installation codes and practices.

In summary, the correct answer reflects a common industry standard where the take-off for a fitting is the same as the nominal pipe size, which in this case is 12 inches for a 12" pipe in a 90° butt weld elbow.