What is the primary role of a pressure relief valve on a gas tank?

The primary role of a pressure relief valve on a gas tank is to prevent overpressure and potential bursting of the tank. This safety device is essential in maintaining safe operating conditions. When gas is stored under pressure, there is a risk that the pressure could exceed the tank's design limits due to various factors such as temperature increases, gas expansion, or faults in the system.

The pressure relief valve is calibrated to open at a specific pressure threshold, allowing excess gas to escape and thus reducing the pressure within the tank. This function is critical in avoiding catastrophic failures that could result in explosions or hazardous leaks, thereby ensuring the safety of personnel and equipment in the surrounding area. Proper functioning of these valves is vital in any system that utilizes gas storage, as they are key components in maintaining the integrity of the gas tanks.