Problems in determining the allowable stress of the butt welded joint between skirt and tower shell
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This post was last written by Aoki_EXZM edited on 2023-8-29 10:47 Today I made a tower. The customer had to make a new tower for the equipment that had been built before. When checking the calculation book, it actually failed:o Then I flipped through the book and found that the problem is in the SW6-2011 V5.0 Patch 3 Instructions, Article 7 Tower Paragraph (3) (4), which contains the following content: (3) When querying the allowable stress of the skirt weld at the design temperature, the design temperature shall be the design temperature of the first section of the cylinder. ； (4) When the skirt is butt-joined with the tower shell, or the skirt overlaps the lower head, the allowable stress of the welded joint shall be the smaller of the allowable stress of the lower head material at the design temperature and the allowable stress of the skirt material at the design temperature. ； The head of my equipment is S30408, and the skirt is Q345R. The design temperature of the equipment is relatively high, so high that Q345R has no allowable stress:curse:, and then press 0 to check, if it is unqualified. When setting up the transition section, should the "skirt material" marked in red be the transition section material?
If there is a transition section, the weld should definitely be the transition section and the head. The allowable stress should be a smaller value. Try changing the skirt data 1. The material of the connection section between the skirt and the cylinder should refer to the transition section.
According to the provisions of Section 7 Tower Paragraph (3) (4) of SW6-2011 V5.0 Patch 3 Instructions, when querying the allowable stress of the skirt weld at the design temperature, the design temperature shall be the design temperature of the first section of the cylinder. When the skirt is butted to the tower shell or the skirt overlaps the lower head, the allowable stress of the welded joint shall be the smaller value of the allowable stress of the lower head material at the design temperature and the allowable stress of the skirt material at the design temperature. The equipment head you mentioned is S30408, and the skirt is Q345R. The temperature is relatively high, so high that Q345R has no allowable stress. If the transition section is set, should the "skirt material" marked in red be the transition section material? According to regulations, the value of the allowable stress of the welded joint should be the smaller value of the lower head material and the skirt material. Therefore, the "skirt material" marked in red should refer to the material of the skirt, that is, Q345R, not the transition section material. Therefore, the value of the allowable stress of the skirt material (Q345R) at the design temperature should be used in the calculation. .
There is a connection segment material input, and nothing changes.
This post was last posted by wanlirn on 2023-8-30 09:15 The skirt material mentioned in the editing software description is a general term. When there is a transition section, of course it refers to the transition section. The standards will make you learn it to death.
The allowable stress of the welded joint, the skirt is equipped with a transition section, the body Q345R and the head have no welded joints, it is obviously wrong to use Q345R material
The skirt should be equipped with a transition section and the skirt body body
I think so. There must be something wrong with the calculations here in SW6, so I sent them an email to ask.
Just say your point of view, why is there so much rubbish?
If you reply to your comments, please let me know in the post, thank you.
This post was last edited by aaa6552367 on 2023-9-1 12:17 This connection weld refers to the transition section and the head