“Does the “stirring flange” need to meet the dimensional requirement of “full penetration”?
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Dear forum members, I have a question: Does the stirring flange need to meet the tolerance requirement of \"full penetration\"? As shown, is the welding of the stirring flange to the head considered full penetration welding? In my opinion, the stirring flange should also comply with the requirements of the code; that is, the D.9 node specified in Appendix D of GB/T 150.3 should be used, as shown in the figure below. For a stirring tank in which hydrogen at 1.6 Mpa is used in the reaction process, the design drawings show that the stirring flange adopts the structure shown in Figure 3.3-2. In my view, this violates the requirements of the code. What are others’ opinions? Discussion is welcome
@Fish in the desert @Pinocchio @68ZCW @BlueSky – Dear experts, please help to clarify this
Whether the stirring flange needs to meet the \"full penetration\" requirement specified in the container standards depends mainly on the designed pressure, the medium, and the safety requirements. For mixing tanks exposed to high-pressure hydrogen, it is particularly important to ensure the integrity of the welds; therefore, full penetration is generally required. The specific circumstances need to be determined in accordance with the specific container design standards and specifications. .
This post was last edited by qqsbig001 on 2024-8-23 at 11:24; it provides no reinforcement for the openings in the head, and the design pressure must not exceed 1.6 MPa.
You are absolutely right; if it’s the structure shown in the diagram, my question is whether this structure achieves full penetration Is it satisfied with the tolerance requirements regarding full penetration of the flange?
From what I’ve encountered, it’s usually fully penetrated
Try to use these structures, as there is vibration generated by the movement of the mixer flange and the motor reducer, which are mechanical components.
Personal opinion: The structure in the image is not considered a fully weld-through structure.
Figure 3.3-2 shows the fillet weld welding, which is example b) in D.3.4.1 of Appendix D in GB150.3; those not subjected to pulse loads can choose this option. In my opinion, placing the flange on the cover helps to distribute the load, which is advantageous for bearing the weight of the mixing equipment; this welding style is also commonly used in reaction vessels.