What function do fittings perform in a pressure piping system?

Fittings are essential components in a pressure piping system as they serve multiple critical functions, with one of the primary roles being to control the flow of fluid. This includes changing the direction of the flow, connecting different sections of piping, and adjusting the flow rate or pressure according to the system's requirements.

When the flow is redirected through fittings, such as elbows, tees, and reducers, they facilitate the smooth transition and movement of fluids through various pathways. This ability to manage the flow ensures that the fluid reaches its intended destination efficiently and effectively, which is paramount in maintaining the integrity and performance of the piping system.

Other functions such as supporting the weight of the piping, insulating the piping, or sealing leaks within the system, while important, do not primarily describe the fundamental purpose of fittings in managing how fluids traverse through a piping network. Thus, controlling the flow of fluid highlights the critical role of fittings in achieving desirable operational outcomes in pressure piping systems.