What is the primary function of an OPD?

The primary function of an Overfill Prevention Device (OPD) is to prevent overfilling of propane tanks. This device is specifically designed to enhance safety by ensuring that the tank is not filled beyond its safe capacity, which could lead to dangerous situations such as over-pressure conditions and potential leaks. By preventing overfilling, the OPD helps maintain the proper functioning of the tank and reduces the risk of accidents.

In the context of propane usage, the regulation of pressure, measurement of propane levels, and safety during transport are also important factors; however, they do not directly represent the main purpose of an OPD. An OPD focuses strictly on the safe filling of tanks, thus making it an essential safety feature in the management of propane storage and usage.