EE
2004-S2-Q4-Solution

# 2004-S2-Q4-Solution - CHE3108 Q4 Mechanical Design(14 marks...

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CHE3108 Q4 Mechanical Design (14 marks) Mechanical design formulae are provided on page 12. As part of your busy day, you also need to complete the design of the purge stream evaporator. The evaporator is a vertical cylindrical vessel 2.0 m in diameter and 3.0 m between tangent lines. It has a design pressure of 5 bar (g). You have already designed the shell and must now design the two elliptical ends, both of which will have a ratio of major axis to minor axis of 2. The wall thickness of the ends (after the corrosion allowance has been deducted) is 6mm. a) Explain what is meant by plane stress and why it can be applied to thin walled pressure vessels. (3 marks) Plane stress is stress distribution in a 2d plane. The plane stress simplification is only appropriate when the stress in the third direction (through the thickness of material) is negligible compared with stresses acting in the direction of the plane. It can be applied to a thin walled pressure vessel because the stress normal to the plane is
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