Abstract:In order to make the iron and steel engineering designer learn more about the process layout of VD/VOD system and make better choice, the two producing modes and the plant layouts with different single or double working positions of VD/VOD system, such as crane type, vacuum vessel car type and vacuum vessel car cross moving type, are introduced. The different type of plant layout of VD/VOD system will bring different benefit to the clients and solve different problems. The different points, investment cost and operational cost between the single and double working positions of VD/VOD system design are compared through the actual examples. The choose of the above two positions depends on the producing demand and investment cost from the clients. The practice proves that VD/VOD system with single working position covers a small floor area, less investment, but long smelting period, which is suitable for the steelmaking plant with small production proportion for the steel grade treated by VD vacuum degassing or VOD decarburization. On the contrary, for the steelmaking plant with large production proportion for the steel grade treated by VD vacuum degassing or VOD decarburization, VD/VOD system with double working positions will be chosen to, which has the advantage of short smelting period, but covers a bigger floor area and more investment.