Regarding the calculation of 120-degree vertebrae
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For example: a vertebral body with an angle of 120 degrees, a large end diameter of 1500 and a small end diameter of 200. The part where the large end of the vertebral body meets the cylinder has straight edges, while at the small end a flange needs to be welded in order to reduce material accumulation. The client requires that no straight edges be present – is it possible to achieve this without straight edges? How to perform calculation verification?
According to GB150.3, flanges should be provided
150 requires straight edges, but the user insists on direct welding of the joints without straight edges; the material in the short sections cannot be mixed properly and will thus solidify
In standard 150, the half-apex angle at the smaller end of the conical shell is limited to 45°; if it exceeds this value, straight edges must be provided. This is a standard mandatory requirement; containers designed and manufactured according to specifications of 150 must be complied with, and it is not up to the customer to decide. Even in ASME Section VIII-1, when this angle does not have straight edges, very complex calculations are required.
In terms of design, should it be the customer who decides or should standards take precedence?
Of course, 150 is a requirement that must be met, but the user has pointed out that units with short sections simply cannot be used. The reaction time from start to finish is around 6 hours; the material inside those short sections will solidify before the additives can be mixed in, and once it solidifies, it becomes like rubber and it’s impossible to extract the material. In other words, this equipment isn’t usable. What he was using before, according to the design drawings, wasn’t suitable either, but when compressed air and nitrogen are used at a pressure of 6 kilograms, even that doesn’t work.
The tank design follows standard specifications; the discharge valve at the bottom of the tank features a special design, with the valve disc being flat against a conical bottom, thereby solving the same problem.
It’s not easy to implement; as long as there’s a short section, material will accumulate, and valves cannot solve the underlying problem
Haha, it’s easy to implement. In many of our crystallization tanks, issues with material caking occur at the conical bottom sections due to solid phase settling and dead zones in mixing