AP] ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SECOND SEMESTER M.TECH DEGREE EXAMINATION, MAY 2016
Mechanical Engineering
{Machine Design)

011/5 6104 Design of Pressure Vessels and Piping

Max. Marks : 60 Duration: 3 Hours
Answer any two full questions from part A,B&C

PartA

1)Derive a relation for the membrane stresses in vessels under internal pressure? Hence arrive at a
relation for the hoop and longitudinal stress in a torus vessel under internat pressure? Also plot the
variation of hoop stress around the torus? (9)

2) a)A compound cylinder is made by shrink fitting a tube of 200mm internal dimeter and 30mm
thickness to an external tube of 40mm thick. Before shrink fitting there was a radial clearance of
0.03mm between the tubes. Find the radial pressure and also plot the final stresses if the tube was
subjected to an internal fluid pressure of 20N/mm2. ‏ع‎ = 200GPa and Poisson ratio = 0.3. (9)

3) a) Name all the sections of ASME design of pressure vessel code (2)
b) Explain why the half cone angle of conical cover is limited to 30°(1)
c) What are the methods to prevent local buckling in elliptical heads ?(I)

d) A cylindrical shell 10m long and 1.5m internal diameter has 25mm thickness. Calculate the
circumferential and longitudinal stresses induced and also determine the change in diameter and
change in length, if the internal pressure is 200N/cm 2 . Take E=200GPa, and ൧0.3 (5)

partB

4)Do the reinforcement analysis for the following data. Inside diameter of shell 125cm. Design
pressure 25Kg/cm 22% 125°C. Allowable stress for shell and nozzle materials are 440MPa. Thickness
of 50611515077 and that of nozzle is thickness നേ. Nozzle inside diameter is 10cm. Extension of nozzle
inside vessel 2.5cm. Fillet weEd size is lcm of equal leg size. Number offillet welds are 4. (9)

5) a)Explain the terms operating pressure, design pressure, maximum allowable working pressure, and
hydrostatic test pressure with reference to pressure vessel (2)

b) Explain the nature of stress on the windward and leeward side of a vessel under internal
pressure, external pressure, wind load and self-weight? (2)

c) Sketch different supports used in vessels? Where each of these supports are used? (21

d) Explain the steps involved in earthquake analysis of a vessel?(3)