66. Why is a vent required in a fuel tank? What are the consequences if the fuel tank is sealed?
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66. Why is a vent required in a fuel tank? What are the consequences if the fuel tank is sealed?
The fuel tank vent allows gases and water vapor to be expelled from the fuel, preventing water vapor from condensing inside the tank. This keeps the pressure in the tank at near zero, enabling the oil returning from the bearings to flow smoothly back into the tank. If the fuel tank is airtight, large amounts of gas and water vapor will accumulate inside it, creating positive pressure that makes it difficult for the oil to return, resulting in significant leakage of oil on both sides of the bearings. This also leads to a deterioration in the quality of the oil.
The fuel tank vent allows gases to be expelled from the tank, maintaining a zero pressure inside it. This enables the oil returning from the bearing shells to flow smoothly into the tank. If the tank is sealed, a large amount of gas will accumulate inside it, creating positive pressure that makes it difficult for the oil to return; as a result, lubricant leaks in large quantities on both sides of the bearing shells, and the quality of the oil also deteriorates.