In This App Blank Plate Size is Calculated. Expansion Bellow used in Heat Exchanger Manufacturing Industry. in this pp when we have to make metallic expansion bellow using forming method then we have to required blank plate for bellow forming this bellow blank plate size is calculate in this app and then it will send for forming Bellow. In this app bellow is made by using two part and then welded it to make complete bellow it is widely used in heat exchanger manufacturing and some piping in