Question 10.6: A vessel flange uses 16 2 in. diameter bolts. Flange stress ...

A vessel flange uses 16 2 in. diameter bolts. Flange stress calculations indicate that a flange thickness of t =4.5 in. is adequate. The bolt circle diameter is C =22.5 in. Will secondary bending stresses be developed?

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The maximum permissible bolt spacing without a penalty is 2d +t =2 × 2+4.5=8.5 in. The actual bolt spacing is

\frac{\pi C}{N}=\frac{\pi(22.5)}{16}=4.42 in.

Because the actual spacing is less than the maximum spacing without a penalty, no secondary bending stresses are developed.

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