Short radius elbow refers to that the radius of curvature of the elbow is 1 times of the pipe diameter; also known as 1D.

The radius of curvature of the elbow is equal to one time of the diameter of the pipe. It's usually a 90 degree angle.

Intuitively, the short radius elbow is much shorter than the long radius elbow, and the bending radius of the elbow is very fast. The long radius elbow is the most commonly used one. Generally, it is also long radius by default. The long radius elbow will be used in the place with high pressure or high flow rate. If the resistance requirements of solid conveying pipeline are strict, the elbow with larger radius should be used.

Short radius is usually used in low-pressure fluid or where elbows are limited. Long radius elbow is preferred if there are no conditions or are not specified in the contract.