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Key words: gas transmission station field; valve maintenance; multiple failures; maintenance treatment Gas transmission station is the basic project in the national energy system. The stability and safety of the project directly affect economic health and social stability. Gas pipelines involve many pipeline facilities and increase the use of valves. Therefore, the valve occupies the most basic and most important position in the field of gas transmission stations and bears various functions such as isolation, fractionation, and control. The types of valves used in the gas transmission stations are various and numerous. The entire operation process of the gas transmission station requires a variety of different forms of operation, which increases the incidence of valve failures and brings a lot of inconvenience to daily maintenance work. Therefore, gas station personnel should pay more attention to valve maintenance work and scientifically deal with valve faults to ensure that fault handling measures are targeted and purposeful, extend the service life of valves, and improve the safety of gas station operation. stability.
1 Maintenance of Common Valves in Gas Transmission Stations In order to reduce the incidence of valve failures and improve the operating requirements of gas transmission stations, maintenance personnel of the gas transmission field need to pay more attention to the maintenance work of the valves, start with the cleaning valves, and do a good job in the lubrication of valves. Ensure that the valve has good integrity and provide a material basis for the normal operation of the gas transmission station.
1.1 Cleaning "Cleaning" is the primary task of protecting the valve. It is necessary to ensure that the surface of the valves and the special positions of the valves on each gas pipeline of the gas transmission station can be clean, tidy and dirty, such as between the stem nut and the bracket. Slide locations, trapezoidal thread positions on stem nuts, stems, worms, turbines, gears, etc. are easily contaminated by oil and dust. If the valve surface and its special position are not cleaned in time, the dirt on the surface of the valve and its special position will continue to increase under the accumulation of time, which will reduce the appearance of the valve, affect the performance of the valve, and pollute the operating environment of the gas transmission station. The corrosion rate of valves, pipes, etc., reduces the performance of the valves on the gas transmission station and the parts where the valve meets the valve. To this end, maintenance personnel should regularly and regularly clean the valve to ensure that the valve surface and its special location can be clean, tidy, and error-free. For some areas where the valve has a relatively large number of paint stripping problems, it is necessary to do a good job of repairing the paint to ensure the integrity of the paint film. When the valve is cleaned, the valve body is usually purged with compressed air or the brush body is used to clean the valve body; the rags are used to scrub the body thread and the interdental stains; the removal of medium residues and oil contamination is relatively difficult, Need to use high-temperature steam to sweep the valve, and the use of copper wire brush to wash unclean stains.
1.2 Lubrication "Lubrication" is the second step in protecting the valve. Lubricating the moving parts of the valve by using the lubricant can reduce the friction between the parts, reduce the destructive force of the friction on the parts, and prolong the service life of the valve. Normally, valves that are frequently opened and that require high temperatures should be lubricated once a week or a month. Valves that are opened less frequently and that are lower in temperature should be lubricated for a quarter or six months. According to the valve is the actual use and operating temperature. There are many types of lubricants, which can be divided into graphite lubricants, molybdenum dioxide lubricants, butter lubricants, organic oil lubricants, etc., depending on the internal components of the lubricant. The application of each type of lubricant is different For example, graphite lubricants and molybdenum dioxide lubricants are lubricants with high-temperature properties. This type of lubricant is suitable for use in high-temperature valve protection; butter and organic oils have poor high-temperature resistance and high-temperature environments. Loss of lubrication performance, suitable for use in low temperature valve protection.
1.3 Protection Protection of the valve, in the final analysis, is to ensure the integrity and tightness of the valve system, so that the valve can have a good operating condition. The first step is to ensure that the bolts are complete and the screws are fastened. Once loosening is found, they must be reinforced immediately. If parts are missing, they need to be replaced in a timely manner to ensure the consistency and accuracy of the replacement models. Secondly, the packing pressure. The cover should be in a proper range, and the pre-tightening clearance should be reserved; the valve stem in the open space should be covered to prevent the wind and rain from causing erosion to the valve; thirdly, the complete range of accessories must be complete and complete; and fourth, the valve must be guaranteed. The ruler is clear and accurate.
2 Multiple gas valve failures in the gas transmission station are the basic components for the control of the fluids in the gas transmission field. Turbine effusions, leaks in the valves, valve body corrosion, valve misalignment, and valve detachment are the frequency of valve occurrence. High failure. In response to such problems, it is necessary to fully implement the valve operation management to ensure that all the valve information is complete, such as the valve specifications, inspection qualified orders, maintenance records, replacement records, etc., and build a GIS management system to classify various types of valve faults. Regularization, to develop specific solutions to specific problems and methods. For example, for the problem of valve leakage, the valve stem needs to be adjusted. If there is a bend in the valve stem, the stem needs to be replaced immediately. If there are impurities in the pipeline, impurities in the pipeline are removed; for the problem of valve leakage, the bolt is usually loosened or It is caused by the aging of the sealing gasket re-selection. It is necessary to reinforce the bolt or replace the gasket.
3 Summary In summary, the valve is widely used in the gas transmission station field, because the valve maintenance and repair work has a very strong complexity and diversity, requiring maintenance personnel to do regular valve protection work to ensure that the valve is clean, Neat and tidy, reducing the incidence of internal leaks, valve body corrosion, valve misalignment, and gate valve fallout, etc., and responding to specific faults, so that the normal operation of the valve can reduce the overall operation of the gas transmission station marketing.
references:
[1] Zhang Caixia. Fault analysis and solution of valve transmission in gas transmission station field [J]. Petrochemical Technology, 2018, 25 (01): 226.
[2]Che Zhiqiang,Yin Yan.Analysis of gas generator problems in gas transmission station and study on countermeasures[J].Shandong Chemical Industry,2017,46(18):105-107.
[3]MA Jinpeng, LIU Yuemei. Discussion on Maintenance and Management of Gas Station Valves[J].Science & Technology Innovation and Application, 2016(28):148.
Abstract: The valve is an important control component in the gas transmission station field. It has strong complexity and diversity in the daily work of the gas transmission station. Different application requirements and different application conditions, the valve has a variety of application types, to a great extent meet the application standards and requirements of the gas transmission station. Although a wide variety of valve types facilitates the application and installation of gas transmission stations, the wide variety of valve types incurs inconvenience in the use and maintenance of the gas station. For this reason, this article will analyze and discuss the maintenance work of gas station valves, and formulate corresponding solutions and methods for the common problems of gas station valves.