The end-cap of a pressure vend as shown in Figure 2 is secured by 6 off M12 x SA

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The end-cap of a pressure vend as shown in Figure 2 is secured by 6 off M12 x SAE class 8 8 bolts (with rolled threads). A soft gasket is used such that the camped member stiffness is one quarter of the bolt stiffness. The internal diameter of the pressure vessel is 140 mm and the pressure in the vessel varies from 0 to P kPa gauge. Assuming that the bolts are initially tightened to 80% of their yield strength determine: the maximum value of P that would not cause separation of the joint; the maximum value of P that would not cause eventual fatigue failure of the bolts; and the minimum practical wall thickness required for the pressure vessel for this maximum pressure P.

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