Dear all
When some flange or any rigid body is attached within two pipe diameter after welding point of a elbow we pick pipe bend type “Single flange” & if both the side of elbow have rigid body we pick “Double flange” as mention in caesar II manual.
I have seen some people use Single or double flange concept even if elbow have fitting to fitting connection with other piping item like reducer, tee.
Is there any clear cut direction or authentic document on the same?