# ch-07 - 224 C H A P T E R n A Textbook of Machine Design 7...

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Chapter 8 / Exercise 8.3-4
Mechanics of Materials
Gere/Goodno
Expert Verified
Pressure Vessels 224 7 C H A P T E R 7.1 7.1 7.1 7.1 7.1 Intr Intr Intr Intr Introduction oduction oduction oduction oduction The pressure vessels ( i . e . cylinders or tanks) are used to store fluids under pressure. The fluid being stored may undergo a change of state inside the pressure vessel as in case of steam boilers or it may combine with other reagents as in a chemical plant. The pressure vessels are designed with great care because rupture of a pressure vessel means an explosion which may cause loss of life and property. The material of pressure vessels may be brittle such as cast iron, or ductile such as mild steel. 7.2 7.2 7.2 7.2 7.2 Classif Classif Classif Classif Classifica ica ica ica ication of Pr tion of Pr tion of Pr tion of Pr tion of Pressur essur essur essur essure e e e e Vessels essels essels essels essels The pressure vessels may be classified as follows: 1. According to the dimensions . The pressure vessels, according to their dimensions, may be classified as thin shell or thick shell . If the wall thickness of the shell ( t ) is less than 1/10 of the diameter of the shell ( d ), then it is called a thin shell . On the other hand, if the wall thickness 1. Introduction. 2. Classification of Pressure Vessels. 3. Stresses in a Thin Cylindrical Shell due to an Internal Pressure. 4. Circumferential or Hoop Stress. 5. Longitudinal Stress. 6. Change in Dimensions of a Thin Cylindrical Shell due to an Internal Pressure. 7. Thin Spherical Shells Subjected to an Internal Pressure. 8. Change in Dimensions of a Thin Spherical Shell due to an Internal Pressure. 9. Thick Cylindrical Shell Subjected to an Internal Pressure. 10. Compound Cylindrical Shells. 11. Stresses in Compound Cylindrical Shells. 12. Cylinder Heads and Cover Plates.
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Chapter 8 / Exercise 8.3-4
Mechanics of Materials
Gere/Goodno
Expert Verified
Pressure Vessels n 225 of the shell is greater than 1/10 of the diameter of the shell, then it is said to be a thick shell . Thin shells are used in boilers, tanks and pipes, whereas thick shells are used in high pressure cylinders, tanks, gun barrels etc. Note: Another criterion to classify the pressure vessels as thin shell or thick shell is the internal fluid pressure ( p ) and the allowable stress ( σ t ). If the internal fluid pressure ( p ) is less than 1/6 of the allowable stress, then it is called a thin shell . On the other hand, if the internal fluid pressure is greater than 1/6 of the allowable stress, then it is said to be a thick shell . 2. According to the end construction . The pressure vessels, according to the end construction, may be classified as open end or closed end . A simple cylinder with a piston, such as cylinder of a press is an example of an open end vessel, whereas a tank is an example of a closed end vessel. In case of vessels having open ends, the circumferential or hoop stresses are induced by the fluid pressure, whereas in case of closed ends, longitudinal stresses in addition to circumferential stresses are induced.