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Detection and Test of GIS Shell
Release time:
2024-04-07
The GIS shell shall be inspected after each processing step. Main length tolerance and shape tolerance inspection and welding quality inspection. According to the requirements of pressure vessel manufacturing specifications, process evaluation shall be carried out.
The GIS shell shall be inspected after each processing step. Main length tolerance and shape tolerance inspection and welding quality inspection. According to the requirements of pressure vessel manufacturing specifications, process evaluation shall be carried out.
(1) Length tolerance and form and position tolerance inspection:
After the main cylinder of the shell is machined, it is placed on the 10 m platform of the testing machine. According to the requirements of the drawing, both ends of the length shall be determined as the measurement datum. Using three-dimensional measuring scribing machine CHXY (scribing length 10000mm, height 3000mm) and matching scribing platform, length tolerance and shape tolerance can be detected or printed out by computer.
(2) Welding quality inspection:
Common methods for welding quality inspection include non-destructive testing, including X-ray real-time imaging testing, penetration testing, etc. Pressure testing requires special pressure tooling. The strength of the shell is assessed by hydraulic testing, which is to slowly fill the shell with water at the specified pressure and keep it for a certain period of time. During the inspection, the pressure remains unchanged, no leakage, no visible deformation, and no abnormal noise during the test; the air tightness test of the weld is also qualified.
Note: ① Before rolling, carefully check the corrosion on the surface of the steel plate. If the corrosion is serious, the plate should be sandblasted and derusted to prevent the surface of the steel plate from being crushed when the plate is rolled. ② When the roller frame is used to weld the cylinder on the main cylinder, the inner hole of the shell must be used to correct the tooling to prevent the shell from producing large deformation. In the process of machining, pay attention to the shell does not produce large vibration, cutting depth can not be too large. ④ M30 above the larger thread bottom hole, to be processed on the machine tool out of a cone, in order to reduce the labor intensity of workers.
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