... steel wire, 10% moisture. Oil usage: you could sell it to oil refining factory directly, use it for heating. Carbon black ... /18mm, other parts is 12mm.4) Automatic welding, processing according to standard of head of pressure vessel.5) With proprietary vacuum system ... condition of negative pressure.Energy saving:1) Exhaust gas recycle to furnace.2) Continuous feeding with automatic feeder, no gas leak ...