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Name of the College : Mahatma Gandhi University MGU
Department : Mechanical Engineering
Subject Code/Name : MMEMD 105-1/Design of Pressure Vessels and Piping
Sem : I Semester
Applicable For : 1st Year Students
Home Page : mgu.ac.in
Document Type : Model Question Paper

Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/mgu.ac.in/5090-MMEMD%20105-1%20Design%20of%20Pr%20Vessels.doc

MGU Design of Pressure  Question Paper

M. TECH. Degree Examination, Model Question Paper – I :
First Semester :
Branch: Mechanical Engineering

Related : MGU MMEMD102 Theory of Vibrations M.Tech Model Question Paper : www.pdfquestion.in/5088.html

Specialisation: Machine Design
MMEMD 105-1 Design of Pressure Vessels and Piping (Elective – I)
(Regular – 2013 Admissions)
Time: Three Hours
Maximum: 100 Marks
(Answer all questions)

Use of ASME code and charts permitted :
1. a) Derive an equation for finding out the hoop stress in a pressure vessel, when d/t < 20 (15 marks)

b) The radius of a thin cylindrical pressure vessel is 2000mm and its wall thickness is 15 mm. (i) Determine the hoop and longitudinal stresses caused by an internal pressure of 2MPa. (ii) Calculate the change in diameter of the cylinder caused by pressurization. E = 220GPa, ? = 0.3 (10 marks)
Or

2. a) A cylinder with a 48 in. inside diameter, and a 60 in. outside diameter is subjected to an internal pressure of 5000 psi.

Determine the value and place of occurrence of
i) the maximum tangential stress
ii) the maximum radial stress
iii) the maximum shear stress (15 marks)
b) With a neat sketch explain the theory of reinforcement. (10 marks)

3. A fractionating tower is 10ft. outside diameter and 30ft. in length. The tower contains removable trays in 10ft. spacing and is to operate under vacuum at 500oF. Choose a suitable material and find the required thickness of shell (i) without stiffeners, and then (ii) with stiffeners located at the tray positions. (25 marks)
Or

4. a) Explain the stress condition at the windward side and leeward side of a pressure vessel. (10 marks)

b) A steel tube of 250mm external diameter is to be shrunk on another tube of 80mm internal diameter. After shrinking, the diameter of the junction is 160mm. Before shrinking, the diameter at the junction was differing by 0.1mm.

Calculate the radial pressure at the junction and hoop stresses developed in the tube after shrinking. E = 200kN/mm2 (15 marks)

5. A cylindrical vessel 14ft ID x 3/8 in. thick has ring stiffeners located on 40 in. spacing, and is subject to an external pressure of 15psi at a temperature of 700oF. The material of both the vessel and stiffener rings is carbon steel with a yield strength of 30000 – 38000 psi.

a) Is the 3/8 in. thickness adequate for a design factor of safety of 4?
b) What is the allowable external pressure for a factor of safety of 3?
c) What is the required thickness for the same ID vessel based on a factor of safety of 3? (25 marks)
Or

6. A long cylinder (20 inch outside diameter and 0.2 inches thick) has ring stiffeners spaced at l = 40 inches and is subjected to external pressure. The material is steel with a yield strength of 40000 psi, E = 30 x 106 psi, and ? = 0.3. (i) Find the elastic buckling pressure. (ii) Will the cylinder fail by elastic buckling before the wall material reaches yield strength due to the tangential hoop stress? (25 marks)

7. a) Find the wall thickness of an 8.625 in. OD pipe for the conditions T = 500oF, P = 850 psi, c = 0.063 in. (corrosion – erosion allowance), allowable stress = 18900 psi, E = 0.85 based on the ASME piping code. (15 marks)

b) With neat sketch explain the type of welds used in different weld joint locations of a pressure vessel. (10 marks)
Or

8. a) Derive the ASME equation for stiffener design. (10 marks)
b) A two anchor routing pipe 10 inch OD has length of 25ft in x, y and z directions. Expansion of pipe is 1in./100ft. Find out any stress analysis is required or not? (15 marks)