What should return piping connect to on a fuel oil tank?

Return piping on a fuel oil tank should connect to the top of the tank. This configuration is important because it helps ensure that any returning fuel oil is directed back into the tank in a manner that prevents the risk of sediment being disturbed and reintroduced into the system. By connecting at the top, it allows for the oil to settle properly and supports the maintenance of clean fuel supply lines leading to the burner or heating appliance.

Furthermore, connecting the return piping to the top of the tank helps to avoid issues such as fuel oil overheating or creating unnecessary turbulence within the tank. In many systems, this design not only adheres to best practices for installation but also aligns with safety standards. It is efficient in promoting proper circulation within the system and helps in observational maintenance by allowing operators to easily monitor levels and quality of fuel without having to disturb the sediment at the bottom of the tank.

The other approaches such as connecting to the bottom or side may lead to complications that are generally avoided following standard industry practices.