Depends on what you're talking about. Is it a fixed oil tank or a tanker? In the absence of man-made oil theft, the loss of fixed oil tanks is also great, but it is basically fixed, which is called fixed loss. The oil tank will "breathe a sigh of relief" when sending and receiving oil, which is limited by the evaporation of oil and the technical state of equipment (such as dripping oil). ) and the technical level of storage and transportation, which is much greater than the "small breathing" loss of the oil tank when storing oil statically. If it is a tanker, it is best to take weighbridge handover or lead seal escort when transporting oil. Before receiving and unloading oil, the oil tank of the tanker should be measured, and the oil unloading port is at the tail of the tanker. Pay attention to maintaining the horizontal parking position of the tanker, which is also convenient for accurate measurement. In the process of transportation, the volume of tanker will change obviously due to the change of temperature, so we should pay attention to the measurement conversion.