When the cylinder is cooling to under the provison temperature, remove the insulation, then remove all the flange bolts and the positioning pin of the surface of cylinder combination, wind pipe guide, front and rear of bearing seal pipe, flange heater wind pipe, and remove the thermal measurement element, Convinced that large covered under the cylinder and other line without any other connection, it allowed to lift the large cylinder cap. For those have inner and outer cylinder unit, the inner cylinder should be no connection.