If you want assist measuring the centerline radius of the present elbow, it's best to speak to an elbow manufacturing expert to make sure you get the right measurements and the top Alternative for your needs. Pipe fitter education, steel fitter training, piping and structural fitter fabricator schooling tips on https://www.malleableiron-pipefitting.com/industry-knowledge/how-to-find-elbow-center-of-pipe.html