Why is a low liquid level interlock installed in storage tanks?

Because of the internal floating roof, it cannot touch the bottom

A low liquid level interlock is installed in storage tanks to ensure safe operation and prevent accidents. When the liquid level in the tank reaches the set value for the low-level interlock, the system automatically activates a series of safety measures, such as stopping the inflow or outflow of liquid, issuing alarms, and automatically shutting off the liquid delivery pipelines. Why is a low liquid level interlock set at over 2 meters? This is because when the liquid level drops to a certain extent, the area of the liquid decreases, thereby increasing the gas space inside the tank, which may lead to the risk of gas accumulation or explosion. Therefore, setting the low liquid level interlock at a certain level of liquid drop, such as above 2 meters, allows for early warning and the taking of appropriate measures to prevent dangerous situations from occurring. At the same time, a drop in liquid level may also expose the equipment inside the storage tank to air, which can lead to problems such as corrosion; therefore, stopping the flow of liquid in a timely manner also helps to preserve the lifespan of the storage tank and its internal equipment. In summary, the low liquid level interlock is installed to ensure the safe operation of the storage tank, prevent accidents, and protect the tank equipment. .

Low-level interlock protection prevents the tank from being emptied, which would otherwise damage the pump and the tank; in the case of floating roof tanks, it also ensures that the floating roof does not drop to the bottom.