Final answer:
The take off for a standard 45-degree 3" pipe ell can be roughly estimated by using the formula 1.414 x nominal pipe size, which would be approximately 4.242" for a 3" pipe. However, this is just an estimation and the exact take off should be confirmed with the manufacturer's specifications or standardized charts used by professional plumbers or pipefitters.
Step-by-step explanation:
The take off for a standard 45-degree 3" pipe ell refers to the amount of pipe length that is needed to accommodate the fitting into the pipeline, so that when it is welded or attached, the flow of the material through the pipeline remains uninterrupted and smooth. To calculate this distance, you normally need to refer to the specific dimensions provided by the manufacturer or use a standardized pipefitter's formula. For a 45-degree ell, if not given by the manufacturer, it can be estimated by taking 1.414 times the nominal pipe size, though it's always best to check the specific standards for the most accurate measurement.
In this case, for a 3" nominal size pipe, the approximate take off would be 1.414 x 3", which equals 4.242". However, precision is critical in such calculations, so professional plumbers or pipefitters would ensure they're using the most accurate and up-to-date information available for the specific ells they are using to ensure proper fit and function in the piping system.