Definition and details of Butt Weld FittingsElbows 45° - 90° - 180° LR/SRThe function of a elbow is to change direction or flow in a piping system. By default, there are 5 opportunities, the 45°, 90° and 180° elbows, all three in the "long radius" version, and in addition the 90° and 180° elbows both in the "short radius" version.Long and Short RadiusElbows are split into two groups which define the distance over which they change di...