# A pressurised cylindrical container has a sealed cover plate fastened with steel bolts as shown…

A pressurised cylindrical container has a sealed cover plate fastened with steel bolts as shown below. The internal pressure p in the thin cylinder is 1900 kPa, the inside diameter D of the cylinder is 250 mm and the diameter d, of the bolts is 12 mm. Cerplate Steel bole -Cylinde 4.1 If the allowable tensile stress in the bolts is 70 MPa, find the number of bolts needed to fasten the cover plate. /3/ 4.2 If the diametral change of the cylinder shell is limited to 0,025mm, determine the thickness of the shell plate required. (Estee = 200 GPa) /3/ From the range of sizes given below select the minimum standard thickness of plate to be purchased for the manufacture of the cylinder. /1/ 8mm; 10mm; 12mm; 16mm; 20mm; 25mm; 30mm; 35mm 4.3 What is the maximum angular velocity in r/min at which the container can be rotated about a vertical axis through its centre if the maximum allowable tensile stress is limited to 53.5 MPa? The density of steel is 7800 kg/m² /3/ [101 Question 5 The following data refer to two close-coiled helical steel springs.

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