Which piping component is designed to change the direction of flow, usually with a curved internal passage?

Which piping component is designed to change the direction of flow, usually with a curved internal passage?

• A. Flange
• B. Vent
• C. Tee
• D. Elbow

Answer: (D)

Redirecting flow in piping is accomplished by an elbow fitting, which has a curved internal passage. The elbow creates a bend in the pipe while keeping the bore continuous, so the fluid can smoothly change direction without a sharp corner. This smooth curvature helps minimize turbulence and pressure loss, especially in larger systems where abrupt changes would be problematic. Elbows are commonly available in 45-degree and 90-degree forms, with long-radius versions offering gentler turns for easier flow. In contrast, a tee redirects or splits flow, a flange is just a mating surface for joining sections, and a vent serves to release gas or air rather than steer flow. Therefore, the component designed to change direction with a curved internal passage is the elbow.

Redirecting flow in piping is accomplished by an elbow fitting, which has a curved internal passage. The elbow creates a bend in the pipe while keeping the bore continuous, so the fluid can smoothly change direction without a sharp corner. This smooth curvature helps minimize turbulence and pressure loss, especially in larger systems where abrupt changes would be problematic. Elbows are commonly available in 45-degree and 90-degree forms, with long-radius versions offering gentler turns for easier flow. In contrast, a tee redirects or splits flow, a flange is just a mating surface for joining sections, and a vent serves to release gas or air rather than steer flow. Therefore, the component designed to change direction with a curved internal passage is the elbow.