Calculation of flat covers for pressure vessels
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In the calculation of the thickness of Gb150 flat covers, the maximum k value specified in the standards is 0.5; however, for flange flat covers, the calculated K value is 2.3. I would like to ask whether there is a maximum value for K Like the maximum value of the graph, 0.5? Or should it be whatever the formula calculates?
And how should we understand the meaning of this K value?
One can refer to the definition of 150; K represents the effect of the edge connections on the maximum stress in the plate. The range of K (when there is no bolt pre-tensioning) is between (0.188, 0.309); for bolts with flat heads, this value is higher than 0.309 due to the bending moment generated by the bolt washers.