The main reason for having a low suction line on the fuel oil service or settling tanks is to __________.

Correct Answer: Option A — facilitate water removal

Settling and service tanks incorporate low suctions and bottom drain valves to facilitate continuous removal of condensed water and heavy sludge accumulation. Eliminating free water prevents burner flameout, erratic combustion, and potential boiler refractory damage caused by water slugs entering the high-pressure fuel lines.