How much is the take-off for an 8"x4" reducing long radius butt weld 90° ells?

In calculating the take-off for an 8"x4" reducing long radius butt weld 90° ell, the correct target measurement often depends on the specifications of the fitting and how the dimensions of the components are transitioned.

For a fitting of this nature, the take-off refers to the amount of pipe that must be accounted for when creating a connection using the fitting. The take-off for a long radius elbow generally extends beyond the centerline of the pipe due to the radius of the curve, and it tends to be longer than that of a short radius elbow.

On average, the take-off for an 8"x4" long radius elbow can typically fall around the 12-inch mark. This is because the long radius is designed to reduce flow restrictions and turbulence in the piping system, and the measurements are standardized according to the specifications set by pipefitting codes and dimensions in the industry.

Thus, when calculating and determining the dimensions for fittings and the necessary material required, using 12 inches aligns with general industry standards for this type of fitting, making it the appropriate choice.