For what reason might a pipefitter choose a 90° elbow over other angles?

A pipefitter often chooses a 90° elbow specifically to make a sharp turn in the piping layout. This type of fitting is designed to redirect the flow of fluids at a right angle, which is essential in situations where space is limited or where a piping system needs to navigate around obstacles. The ability to make a quick, effective turn allows for a more compact design, providing flexibility in laying out piping in various configurations.

In piping systems, especially in industrial or commercial settings, the need to reroute pipes at sharp angles is common. The 90° elbow facilitates this redirection without requiring extensive additional piping or fittings, making it a practical solution in many applications. While other angles could also be used to alter the direction of flow, the 90° elbow is specifically favored for its efficiency in achieving a sharp change in direction.