What is the take-off of 10" in 45° butt weld ells?

In piping and fitting practices, the term "take-off" refers to the length that is added to the overall length of a pipe when connecting fittings, such as elbows or tees. For a 10" pipe with a 45° butt weld elbow, the standard take-off is typically determined by industry standards.

In this case, for a 10" 45° elbow, the standard take-off is indeed 6 1/4 inches. The reason this specific measurement is correct has to do with the geometry of the fitting and how it transitions the flow of the pipe. The 6 1/4 inches represents the centerline dimension from the end of the pipe to the centerline of the other end of the elbow. This take-off measurement is critical for accurate pipe fitting and installation, as it allows pipefitters to plan and cut pipe lengths appropriately before installation.

Knowing these specific take-off values helps in ensuring proper alignment, minimizing waste, and maintaining the efficiency of the plumbing or piping system being constructed or modified.