Repairing method for split sealing surface of pressure resistant vessel

Abstract

The invention discloses a repairing method for a split sealing surface of a pressure resistant vessel. The pressure resistant vessel mainly comprises an upper half cylinder and a lower half cylinder, which are connected together by a fastening bolt; and the split sealing surface is formed between the upper half cylinder and the lower half cylinder. The repairing method comprises the following steps: (1) checking the gap of the split sealing surfaces between the upper half cylinder and the lower half cylinder, and completing the record; (2) taking the sealing surface of the upper half cylinder as the standard; determining a surfacing zone on the sealing surface of the lower half cylinder and the corresponding surfacing thickness according to the checked data; (3) cleaning the surfacing zone on the sealing surface of the lower half cylinder, conducting the zoned and segmented surfacing, and forming a grid-shaped surfacing layer on the sealing surface of the lower half cylinder; (4) polishing the surfacing layer, and reserving a scraping allowance; and (5) conducting zoned scraping to enable the sealing surface of the upper half cylinder and the sealing surface of the lower half cylinder with the surfacing layer to form a split sealing surface meeting the design requirement. The repairing method can eliminate the gap between the sealing surfaces of the upper half cylinder and the lower half cylinder reliably to achieve a good sealing effect.

Description

technical field [0001] The invention relates to a method for repairing the sub-sealing surface of a pressure vessel, especially a cylinder of a steam turbine. Background technique [0002] The cylinder is an important pressure vessel in the steam turbine unit, which is used to make the steam work in the cylinder to drive the rotor. Due to the large structural volume of the cylinder and the high-temperature and high-pressure steam as the pressurized medium, the operating conditions of the cylinder are harsh. After the cylinder has been in operation for a long time, the cylinder body at the middle sealing surface will be deformed due to material stress, corrosion and other factors, resulting in a deformation gap, which will cause the medium-steam leakage in the cylinder body. In order to ensure the stable, safe, reliable and high-efficiency operation of the steam turbine unit, it is necessary to repair the sealing structure at the sealing surface of the cylinder in a timely m...

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Problems solved by technology

[0004] At present, there are many sealing technologies applied to the sealing surface of the steam turbine cylinder. However, among these sealing technologies, there are very few technologies that can be effectively applied to repair the sealing surface of the cylinder in the field of operation.

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