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As one of the core devices for catalytic cracking, the quality of the regenerator's welding installation is a key physical object that represents the quality and level of construction. It is not allowed to be vague and the regenerator begins to enter the welding stage. In 2010, it was a big year. For this reason, the engineering company attached great importance to it, invested a lot of manpower and material resources, and specifically assigned the captains of the two teams to the project construction site, assisted in stabilizing the professional project team, strengthening the construction organization, and taking command. Strengthen management to ensure the quality of regenerator construction. In the face of the present rainy season in Hunan, it is rainy and cloudy, the air is cold and humid, and the harsh and harsh environmental conditions of roads on the construction site are muddy. In addition, the concrete frame of the settler is in the three-dimensional cross-construction phase of the demolition and erection, and the safety protection for high altitude unloading is all right. The operating environment has increased the unfavorable conditions for construction. No matter whether it is to conduct teamwork, welding or lifting operations, it is very prone to problems and even dangerous. At the same time, the construction period is short, the construction process is compact, the space on the site is small, and the situation on the construction site is extremely complex. This has raised new issues for the construction organization and management of the Changling professional project of the project company, which has increased the difficulty of management.
Under the coordinated deployment of the Changling project in Hunan, the engineering company faced difficulties and faced difficulties, led by the spirit of “bright swordâ€, used the company’s “iron military style†for many years as its soul, and gave full play to its subjective initiative. The method of erecting units at different time periods avoids or reduces the time between cross-operations of welding and erection of site regenerators and ensures that the work is carried out in an orderly manner; in addition, pavements are prepared to solve the muddy and uneven surfaces of the site. The problem is being set rightly; and a rainproof shed has been erected, and the method of drying the bead before welding has been adopted to reduce the problem of the occurrence of blowhole defects in the weld bead due to weather conditions; Try to adopt the welding method of CO2 gas shielded welding to improve work efficiency, first select the operation on the longitudinal joint of the cylinder, and carry out quality inspection in time for the results. The result is a total of 27 inspection photos for welding, and the qualification rate reaches 100%. Thus, it was confirmed that the CO2 gas shielded welding can be used for the continuous welding of the regenerator barrel until the completion of the construction process. After a phase of construction operation inspection, the regenerator oval bottom weld seam 54 meters, a total of 217 II-type film was detected, only 4 defects occurred in the rework, a pass rate of 98.2%. Among them, the CO2 gas protection weld bead reached 44 meters, a total of 177 photographs, only 3 reworks were performed, and the first-time qualification rate was 98.3%.
At the same time, since the CO2 gas shielded welding was used to weld the regenerator skirt foundation girth, not only the foot height, but also the welding quality fully meets the design requirements. What's more important is that the welding speed of CO2 gas shielded welding is higher than that of manual burying. Arc welding increased by about 1.5 times. At the same time, the appearance of the weld bead is also very beautiful, not only guarantees the construction quality, but also won sufficient time for follow-up work.
Through a piece of real data, the CO2 gas shielded welding could not be applied to the cognitive bias of pressure vessel welding. Created a CO2 gas shielded welding pressure vessel and achieved high quality and high efficiency.
At present, the regenerator has completed the work of the installation team for the first and second hoisting sections. During the welding work of the transition section and the φ12.6m barrel section, the new construction method has also been continuously improved and the project has entered. In a new stage, there are more difficulties waiting for us to overcome and overcome. More important tasks are waiting for us to fight hard to complete. The second professional Hunan project of the equipment company will continue to do a better job of completing the next work. To achieve better results.
Great achievements have been made in the new welding process of pressure vessels for CO2 gas shielded welding in Changling Project
The core equipment of the 2.8 million-ton/year catalytic cracking unit of the Changling Refinery, Hunan Province, which was built by Sijian II Equipment Co., Ltd., has been completed with the elliptical lower head and the 7.9m diameter longitudinal welded joint. jobs. The excellent results of a welding pass rate of 98.2% won the unanimous praise from the owners, supervisors, EPC and other units.