Weld joints between the nozzles and the shell of atmospheric pressure vessels
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For the weld joints between the nozzles and the shell of pressure vessels at atmospheric pressure, full penetration is not required. However, if the medium inside the vessel is corrosive and welding from the inside is not possible (only single-sided welding is feasible), then a full-penetration structure with bevels and TIG welding for the root pass should be employed.
For corrosive media, consideration should be given to pipe anti-corrosion
It is recommended to use a fully penetrative structure with grooves and TIG welding for the root pass. Gap corrosion is very severe in partially welded-through structures.
Since structural constraints prevent double-sided welding, a single-sided welding structure with TIG welding for the root pass should be used to ensure full penetration. This requirement should be specified in the design.