What contaminant is typically found in fuel-oil coming from the storage tank?

Fuel oil in storage tanks can accumulate various contaminants over time, with dirt and sediment being among the most common. These contaminants typically originate from several sources. For instance, during the filling process of the storage tank, dirt and debris can inadvertently enter the system. Additionally, as fuel oil sits in the tank, there is the potential for the formation of sludge from the natural breakdown of the fuel, which can include particles that can impede the operation of the burner or core heating system.

While water can also be a concern, it is often considered separately as a contaminant rather than part of the dirt and sediment. Soot, which is primarily a byproduct of incomplete combustion, originates from the burning process rather than from the storage of fuel. Air is not a contaminant found in the fuel itself; instead, it might be an issue related to air leaks or faulty seals in the system.

Thus, dirt and sediment represent a more direct concern related to the quality of fuel oil straight from storage tanks, affecting burn efficiency and overall system performance.