Question 10.7: Suppose that a vessel requires 24 2 - 1/2 in. diameter bolts...

Suppose that a vessel requires 24 2 – 1/2 in. diameter bolts on a flange that is 5.5 in. thick. What is the maximum bolt circle that will not cause secondary bending stresses? The minimum bolt spacing for 2 1/2 in. diameter bolts is 5 1/4 in.

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The maximum spacing is

2 d+t=2 \times 2 \frac{1}{2}+5.5=10.5 in .

The diameter of the bolt circle is

\frac{10.5 \times 24}{\pi}=80.2 in.

based on maximum spacing.

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