May I ask the experts about whether the groove should face inward or outward?
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As shown in the diagram, it is said that having the groove face inward can reduce corrosion. However, in my experience, the grooves are usually facing outward. The diameter of this tank is too small; if the groove faces inward, workers will have to stay inside for too long while welding, which increases the risk of heat stroke. Is there any explicit regulation stating that the groove must face inward? Which standard does this refer to? Thank you for your guidance
For small-diameter containers, an external groove is sufficient. Large-diameter containers use internal grooves (with manholes)
Is there any explicit textual evidence that specifically addresses this issue?
The design of the groove must take various factors into account: 1. To facilitate welding operations and reduce defects that may occur during welding. 2. Save welding materials and reduce the intensity of labor. 3. Improve the appearance of the weld after welding, and reduce welding deformation and stress in the weld. 4. Dilution rate also needs to be reduced in welding dissimilar metals. The teacher also mentioned that there are specific considerations regarding the inner and outer bevels. If the thickness of the base material is large, using an outer bevel results in a wide weld seam on the outside after welding is completed, resembling a belt; the stress associated with a single-bevel design is also high. If welding can be carried out on the inner side as well, an X-shaped bevel should be used, as this reduces the amount of welding material needed, as well as the stress and labor required. If the thickness is not large, after welding with an internal groove, a smaller and narrower weld can be seen on the outside, which looks quite aesthetically pleasing. Whenever conditions permit, it is essential to follow the above four points as much as possible in order to design an optimal groove shape.
This topic is suitable for more discussion in the static equipment section
This post was last edited by AtlantisH on 2021-7-25 at 18:13. It’s large tanks with capacities ranging from 1000 to 5000, copied from the complex; the grooves are all on the outside. I’ve never heard of the claim that having the groove on the inside can reduce corrosion.