Red Seal Oil Heat System Technician Practice Exam

What is the significance of the oil tank's fill and vent pipes?

1. They control the temperature inside the tank

2. They allow the tank to be filled with oil and for air to escape

3. They prevent contamination of the oil

4. They monitor the oil levels

The correct answer is: They allow the tank to be filled with oil and for air to escape

The fill and vent pipes of an oil tank serve crucial roles in the functioning of the oil heating system. The fill pipe is designed to enable the tank to be filled with oil when a delivery occurs, allowing for efficient refueling. The vent pipe plays a complementary role by allowing air to escape from the tank as it fills; this is essential because if the air cannot escape, it can cause pressure to build up inside the tank, potentially leading to leaks or spills. Proper venting also helps to prevent the tank from collapsing under negative pressure when oil is withdrawn for use. Therefore, the response indicating that the fill and vent pipes allow the tank to be filled with oil and for air to escape accurately captures these vital functions, which are necessary for safe and efficient operation of an oil heat system.