Which measurement represents the take-off of a 45° butt weld Ell for a 6" nominal pipe size?

For a 6" nominal pipe size, the measurement that represents the take-off of a 45° butt weld elbow is based on the specific dimensions and characteristics of the fitting dimensions applicable to that pipe size.

The take-off measurement for a 45° elbow is typically calculated from the centerline of the pipe to the end of the fitting. This measurement accounts for the angle and geometry of the elbow, providing an accurate extension of pipe length needed to connect to the fitting properly. In this case, the take-off measurement for a standard 6" nominal pipe size fitting aligns with the given option of 5 1/4 inches.

This value is recognized in plumbing and piping standards, making it critical for professionals in the field to understand and apply these dimensions correctly for ensuring proper installation and functionality of piping systems.