Loading loss includes oil and gas loss at automobile gas stations and oil and gas loss during loading and unloading of trains, cars, ships and other means of transport.This part of the loss is much greater than the breathing loss of the tank.According to foreign studies for many years, in the loading process, the hydrocarbons discharged into the atmosphere is 1.3kg/m3, and the oil and gas wasted in a loading and unloading operation accounts for about 0.17% of the whole loading amount.