Relationship between the reinforcement range of the openings in the tube box stubs and the length of the tube box
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I’m a complete beginner; I’ve been working on pressure vessel design for only a short time. Recently, I encountered two issues regarding the length of the tube sheet stubs and the effective reinforcement area B； Question 1: On page P156 of GB150-2011, the value for “effective reinforcement range B” is taken as the larger of 2dop and dop+2δn+2δnt. However, this value differs from that of B in the SW6 calculations. Can we use the value of B from the SW6 calculation sheet? Question 2: The length of the tube box joint should be greater than the effective reinforcement range B. For example, if the effective reinforcement range B is 320, does the tube box joint just need to be larger than 320? Are there any regulations regarding by how much it should be larger? I would be extremely grateful if all teachers and seniors could offer their guidance!
It is required to comply with GB150; for tube box sections that are short, the actual section length should be entered in SW6.
Thank you for your reply. The B value is to be taken according to GB150. Is there any specification regarding how much larger the length of the tube box stub should be than the B value?
No, the length of the tube box is determined by the process engineering team, and it can be less than value B