The jacket of glass-lined reactors often gets damaged and requires welding – what causes this?
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The materials are generally acetic acid, acetic anhydride, petroleum ether, gasoline, etc
Is it in the same location, and what is the quality of the welded joint? What is the material of the jacket, and is it in a location subject to fluid erosion? What are the physical and chemical properties of the fluid inside the jacket?
They are all in the same location; the material is Q235. As for the welding quality, it’s hard to say – welding is generally done at the joint areas, that is, at the R corners. Steam is usually used for the cladding
The main types of local corrosion include intergranular corrosion, pitting corrosion, stress corrosion, etc. These corrosions often cause cracks in the welds. The common method for on-site repair is to grind away the damaged portion of the weld and then re-weld it, but this re-welding process further deteriorates the material in the heat-affected zone of the weld, making it more susceptible to corrosion and damage, resulting in a situation where the condition worsens with each attempt at repair. Therefore, post-weld treatment is an essential process.
First, perform patch welding at the original crack, then weld the reinforcement plate.