Final answer:
The correct option is a) An elbow with a small bend radius. A short radius return bend is an elbow that changes the direction of flow by 180 degrees with a center-to-end distance equal to the pipe size, used where space is limited.
Step-by-step explanation:
A short radius return bend is an elbow with a small bend radius. This is a piping component that is used to change the direction of flow in a piping system by 180 degrees. The key feature of a short radius return bend is that its center-to-end distance is typically equal to the nominal pipe size (NPS), which makes the bend radius short. This type of bend is often used in compact spaces where a larger radius elbow cannot fit.
A short radius return bend is option a) An elbow with a small bend radius. An elbow is a pipe fitting that is used to change the direction of fluid flow in a piping system. A short radius return bend refers to an elbow with a small bend radius, which means the curvature is tight and the angle is sharp.