Butt weld elbows come in long radius, with a centerline radius 1.5 times the nominal size, and short radius, equal to the nominal size, which takes up less space but adds pressure drop and erosion. Threaded and socket weld elbows are compact forged fittings. An elbow right at a pump suction or just upstream of a flow meter skews the velocity profile, so specs call for straight runs.
Two long radius elbows and a 45 gets us around the column, I'll tack them up and you check my fall.
Also heard as
- ell
- 90
- 45
- LR
- SR
Related terms
Street ell
A threaded or sweat elbow with one male and one female end, so it screws straight into another fitting.
Tee
A T-shaped fitting that splits or joins flow, with a straight run and a side branch.
Butt weld
An end connection where a beveled valve or fitting end is welded straight to beveled pipe with full penetration.
Reducer
A fitting that joins a larger pipe to a smaller one, either on a common centerline or with one side flat.