What is NOT a concern with oil accumulation in level columns?

The correct answer highlights that the loss of heat transfer with the sight glass and the column is not a concern associated with oil accumulation in level columns. In level measurement applications, especially those involving float systems, the primary issues typically revolve around how the oil affects the functionality and measurement accuracy within the column.

When oil accumulates in the level columns, the concerns primarily stem from how this accumulation can disrupt the operation. For instance, oil can reduce the conductivity of the level measurement system, leading to inaccuracies. It can also result in false liquid level readings because the buoyancy of the float may be altered or misinterpreted if oil is present. Additionally, oil can thicken and impede the movement of the buoyancy ball in the float, thereby preventing proper level detection.

The idea of heat transfer loss is less relevant to the immediate operation of measuring levels and influencing readings directly, making it an item that does not fit the typical concerns associated with oil accumulation in level columns.