1. PRESSURE VESSEL

2. 1.Determine the bursting steam pressure of a steel shell with diameter of 10 inches and made of ¼ in thick steel plate. The joint efficiency is at 70% and the tensile strength is 60 ksi. (ME Board October 1997). a.4200 psi b.10.5 psi c.42.8 ksi d.8500 psi

3. 2.Determine the safe wall thickness of a 30 inches steel tank with internal pressure of 7.82 MPa. The yield stress of material is at 275.48 MPa. The factor of safety to use is 2.0. (ME Board October 1997). a.¾ inch b.23.6 cm c.21.6 mm d.5/8 in

4. 3.The work cylinder of a hydraulic system is acted by a hydraulic pressure of 370 psi while the maximum load of the piston is 5500 lbs. If the allowable tensile stress is 2000 psi, what is the required wall thickness of the cylinder. a.0.402 in b.0.448 in c.0.240 in d.0.284 in

5. 4.Design a vertical steel cylindrical water tank 30 m in diameter and 45 m high. Consider the pressure variation in the water to follow a straight line from the edge of the top to the center of the bottom and the allowable stress of the steel plate is 120 MPa. Without reinforcing angle bars and rods, find the thickness of the steel plate. (ME Board October 2006). a.55 mm b.75 mm c.85 mm d.25 mm

6. 5.A cylinder having an internal diameter of 20 in and an external diameter of 36 in is subjected to an internal pressure of 10,000 psi and an external pressure of 2,000 psi. Determine the hoop stress at the inner and outer surface of the cylinder. a.13,143 psi, 5,413 psi b.13,143 psi, 5,143 psi c.13,413 psi, 5,413 psi d.13,413 psi, 5,143 psi

7. END