What is the formula for calculating the take-off of a long radius 90° butt weld elbow?

The take-off for a long radius 90° butt weld elbow is calculated using the formula of 1.5 times the pipe diameter. This calculation reflects the unique geometry of the long radius elbow, which allows for a smoother transition for fluid flow and reduces turbulence. The long radius is typically defined as being one and a half times the nominal pipe diameter, thus providing a more gradual change in direction compared to a short radius elbow.

This measurement is crucial for proper fitting and installation in piping systems, as it influences not only the space required for the installation but also the overall efficacy of fluid transport through the system. Fitting installations with the correct take-off measurement ensures efficient flow and minimizes the potential for pressure loss and erosion.

Keeping this standard in mind helps pipefitters maintain consistency and reliability in the design and installation of piping systems.