How to optimize Body flange design in AutoPIPE Vessel?
Body flanges can be a very expensive component of a pressure vessel particularly if the material of construction is expensive eg. nickel alloys or stainless steel. Hence performing an optimum flange design is critical for a cost effective solution.
AutoPIPE Vessel flange design module offers several optimization methods eg. EN 13445 Annex. G, with compression rings, loose and bolt tensioning options.
There are 4 options available for optimization based on hub stress and gasket circle reaction optimizations and also another design method based on bolt load namely design, full or controlled bolt load.
Shown above are the results from a case study on the design of a body flange using the hub stress and gasket circle reaction based on the 4 optimization methods available in AutoPIPE Vessel.
In summary one can easily observe how much difference in cost each of the methods can result to.
Options 2 and 4 which are the higher cost options, lead to a much more safe and conservative design with significantly reduced hub stress but with 40%-55% cost increase.
Options 1 and 3 result in more compact flanges with smaller hub length and flange diameter but at the cost of higher hub stress. Hence the optimization method provides a valuable iterative approach to arrive at the most optimum design based on the cost vs. performance criteria.
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