What is the primary function of a pressure gauge in a piping system?

The primary function of a pressure gauge in a piping system is to measure and display fluid pressure. Pressure gauges are essential tools that provide vital information about the operational status of a system. By indicating the pressure within the pipes, they help individuals determine if the system is functioning within its intended pressure range. This monitoring is crucial for safety, efficiency, and maintenance purposes, as it can indicate potential issues such as pressure drops or surges that might signify blockages, leaks, or equipment malfunctions.

The other options focus on different aspects of system monitoring. Monitoring leaks could involve various methods including visual inspections or using specialized leak detection systems rather than just a gauge. Controlling temperature is typically handled by thermometers and control valves, which manage thermal processes. Checking fluid velocity relates to the flow of liquid and is measured using flow meters, not pressure gauges. Thus, while all components are important for the overall operation of piping systems, the pressure gauge specifically serves the key role of measuring and displaying fluid pressure.