Hmm, i'm not exactly sure you understand my confusion.
If you look at the dimension table that robyengIT posted is says that a DN50/2" 3D elbow has a radius of 152mm (3 times the radius).
But if you look at this...
I just got a tender where i among others ordered some pipe elbows. On the pipe elbows it said 3D and i thought, "hmm that must be wrong because i want 1,5D bends (1,5 times the diameter)". However now that I've done some googling I realized that the pipe standard (ISO 5151) says that 3D elbows...
