Selection of the coefficient for non-circular flat covers
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In GB150-2011, regarding the calculation of the thickness of flat circular lids, the calculation formula includes a shape factor Z for non-circular lids, where z = 3.4 – 2.4*a/b and z ≤ 2.5. For some values of a/b that are too small, the value of z exceeds 2.5. The national standard does not provide detailed information on this situation; neither does the interpretation of GB150-2011 \"Pressure Vessels\" nor JB4732-1995 \"Steel Pressure Vessels\" offer any detailed explanations on this point. Therefore, clarification is needed regarding the specific criteria for determining the value of Z
Weren’t you already very clear about that? It is the result of combining two conditions: if the value is greater than 2.5, then 2.5 is taken.