Which type of coupling maintains a constant centerline?

The type of coupling that maintains a constant centerline is concentric coupling. This design allows for both pipes or fittings to be aligned along the same central axis, ensuring that the flow path remains uninterrupted and the system operates efficiently.

In practical applications, concentric couplings are crucial in maintaining the integrity of the pipeline, as they minimize the risk of misalignment which can lead to leaks or stress on the system. Being designed to keep a uniform distance between the centerlines of the connected pipes, concentric couplings help facilitate a smooth flow of fluids, reducing turbulence and pressure drops.

This makes them particularly useful in systems where maintaining a consistent diameter is critical to performance.