What component allows a one pipe oil delivery system to operate as a two pipe oil delivery system?

In a one pipe oil delivery system, the oil is delivered to the burner using a single line, which returns the oil back to the tank by gravity flow. However, by using an oil deaerator, this system can effectively operate as a two pipe system.

The oil deaerator functions by removing air from the oil, which is vital for optimal burner operation. It creates a situation where the oil can be pumped back to the storage tank without any air bubbles that can disrupt the flow or combustion process. This capability transforms the delivery system, allowing for better fuel management and efficiency similar to that of a two pipe system, where one line delivers the oil and another line returns the unused oil back to the tank.

This enhancement is critical because air in the fuel lines can lead to cavitation in the pump or even burner shutdowns due to lack of proper oil flow, which negatively impacts heating efficiency and reliability. Therefore, the oil deaerator plays a vital role in enhancing the functionality of a one pipe oil delivery system, enabling it to perform with the benefits typically associated with a two pipe system.