Design of the weld joint between the takeover and the flange cover
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According to clause 3.2.2.2 of the TSG 21-2016 Regulations on Safety Technical Inspections for Fixed Pressure Vessels, for pressure vessels containing explosive media, the welding joints between the nozzles and the vessel shell shall be designed with a fully penetrated structure. So, if there are nozzles on the manhole flange cover, how should the weld joints between them be designed? Is the flange cover considered part of the housing? If the flange cover is considered part of the housing, what kind of fully penetrative structure should it be designed to have?
The flange cover opening is designed as a flanged structure and welded to the pipe fitting. Alternatively, use plug welding with full-thickness penetration, making sure to thicken the wall thickness of the pipe fitting appropriately.
If the flange cover is not thick, the HG20583-2011 G25 joint type can be chosen. If the flange cover is thick, it is recommended to use a fixed type, with the groove made on the pipe fitting and full penetration welding.
Comparison of hole reinforcement for bolted flange covers in different countries
It is better to use fixed forged fittings as transitions on both sides.
I don’t quite understand. If there are multiple nozzles on a flange, the placement method is not suitable.