Rough and smooth surface flanges on the device body
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HG/T20583, 4.2.2 When a male-female or tenon-socket face type is selected for the sealing surface of the vessel’s nozzles, nozzles located on the top and sides of the vessel should use male or socket flanges; nozzles located at the bottom of the vessel should use female or tenon flanges. This is why. There was once a project where, after the bottom connection flange, a metal hose was used directly in the design; during on-site construction, however, two convex surfaces were present, so a short connector had to be added. After all, it’s quicker to purchase flanges with convex surfaces. Therefore, some people change all the process pipe ends to a concave shape in order to facilitate the use of result flanges; this way, all the pipeline flanges are convex while valves and similar components are concave, which simplifies things. What’s the problem with that?
In accordance with the requirements of HG/T20583, male and female flanges at different positions are used to ensure a good sealing effect and to facilitate liquid drainage. Concave flanges are used for the nozzles on the top and sides of the container, as this prevents residues from accumulating. The nozzle at the bottom of the container should be equipped with a convex flange to facilitate the discharge of the contents inside and reduce dead zones. If all process ports are changed to concave shapes, it can indeed simplify the installation of flanges and inventory management, but it may affect the drainage efficiency and sealing reliability of the connections at the bottom of the container. Therefore, this approach may have potential issues, and it needs to be considered in light of actual operating conditions and process requirements. .