How do you perform a pressure test on a plumbing system?

Performing a pressure test on a plumbing system is essential for identifying leaks and ensuring the integrity of the piping. The correct approach involves filling the system with water or air and monitoring the pressure for any drops. This method is effective because any loss of pressure indicates the presence of a leak in the system.

When water is used, it's common to pressurize the system to a specified level, usually above normal operating pressure. If air is used, it must be done safely and often involves using a compressor. Monitoring pressure involves using a gauge to observe the system's pressure over a set time; if the pressure decreases, this confirms the presence of a leak that requires repair.

The other methods described in the other options do not adequately assess the plumbing system's integrity. Checking water temperature with a pressure gauge does not indicate leaks or system performance. Inspecting joints for leaks is a valid maintenance step but does not provide the same comprehensive assessment that a pressure test offers. Filling the system with oil is not standard practice for residential or commercial plumbing systems and can lead to complications, as oil is typically not a suitable medium for detecting leaks in conventional plumbing scenarios.