Repair method of the sealing surface of the middle part of the pressure vessel

Abstract

A method for repairing the centrally divided sealing surface of a pressure-bearing vessel. The pressure-bearing vessel is mainly composed of upper and lower half-cylinders connected together by fastening bolts, and there is a centrally-divided sealing surface between the upper and lower half-cylinders; the repairing method includes: 1). Check the gap between the upper and lower half-cylinder sealing surfaces, and make a record; 2). The sealing surface of the upper half-cylinder is used as a reference; according to the inspection data, determine the surfacing area on the sealing surface of the lower half-cylinder , and determine the corresponding surfacing thickness; 3). Clean the surfacing area on the sealing surface of the lower half of the cylinder; carry out surfacing in sections and sections, and form a grid-like surfacing layer on the sealing surface of the lower half of the cylinder; 4 ). Grind the surfacing layer, and reserve a scraping allowance; 5). Scrape and grind in different areas, so that the sealing surface of the upper half cylinder and the sealing surface of the lower half cylinder with the surfacing layer meet the design requirements The middle part of the sealing surface. It can reliably eliminate the gaps on the sealing surfaces of the upper and lower half cylinders 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...

AI Technical Summary

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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