Long radius elbow refers to its radius of curvature is equal to 1.5 times the pipe diameter, i.e. R = 1.5D.
The eyi ogologo okirikiri n'ikpere aka na-ezo aka ná mpụta dayameta nke tube onye okirikiri nke curvature bụ hà 1.5 ugboro, ya bụ, R = 1.5D.