An hydraulic control for a straight line motion, as shown in Fig. 7.4, utilises a
spherical pressure tank ‘A’ connected to a working cylinder B. The pump maintains a pressure of
3 N/mm2 in the tank.
1. If the diameter of pressure tank is 800 mm, determine its thickness for 100% efficiency of
the joint. Assume the allowable tensile stress as 50 MPa.
2. Determine the diameter of a cast iron cylinder and its thickness to produce an operating
force F = 25 kN. Assume (i) an allowance of 10 per cent of operating force F for friction in the
cylinder and packing, and (ii) a pressure drop of 0.2 N/mm2 between the tank and cylinder. Take safe
stress for cast iron as 30 MPa.
3. Determine the power output of the cylinder, if the stroke of the piston is 450 mm and the time
required for the working stroke is 5 seconds.
4. Find the power of the motor, if the working cycle repeats after every 30 seconds and the
efficiency of the hydraulic control is 80 percent and that of pump 60 percent.
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