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Appendix 2 Flange fillet radius

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OnG_Engr

Mechanical
Sep 14, 2017
28
US
I am designing a 54" Appendix 2 flange and am trying to size the fillet radius 'r' in Figure 2-4. My flange resembles the one in sketch 6 of 2-4. Note (3) at the end of Figure 2-4 says "Fillet radius r to be at least 0.25 g1...". My g1 is 4.75" thick, giving me a radius of 1.188". Yet in sketch 12(a) above a 3/8" radius is fine if I designed the flange more like an HB forging. Am I misreading Note #3?
 
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