What do arrows on piping diagrams indicate?

In piping diagrams, arrows play a crucial role in indicating the direction of fluid flow through the piping system. This is essential for understanding how the system operates, as it helps engineers and technicians determine how fluid moves from one part of the system to another. The directionality provided by these arrows is vital for troubleshooting, maintenance, and ensuring the system functions correctly. Understanding the flow direction allows operators to anticipate the behavior of the system under various conditions, which can be important for safety and efficiency.

While other options might seem relevant, such as pressure levels, material type, or pipe diameter, these aspects are typically indicated by different symbols, labels, or color codes, not by arrows. Therefore, recognizing arrows as indicators of flow direction is key to interpreting piping diagrams accurately.