Mechanical Equipment Design - Dec 2015
Chemical Engineering (Semester 4)
TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.
Write short notes on any four:
1(a) Material of construction for reaction vessels.(5 marks)
1(b) Types of heads for pressure vessels(5 marks)
1(c) Standards, codes & their significance.(5 marks)
1(d) Various types of roofs for storage vessels.(5 marks)
1(e) Various theories of failure.(5 marks)
2(a) Write a design procedure for agitator vessel which includes:
i) Agitator shaft, ii) Blade assembly, iii) Stuffing box.(14 marks) 2(b) Draw a proportionate drawing of stuffing box.(6 marks) 3(a) Explain the design procedure with relevant formulae for designing a rectangular tank, without stiffeners & with stiffeners.(8 marks) 3(b) Write short note on any three,
i) Types of agitators and their applications.
iii) Selection, types & design of gasket.
iv) Design stress and factor of saftey.(12 marks) 4(a) Describe the design procedure for reaction vessels with
i) Plain jacket,ii) Channel jacket,iii) Limpet coil jacket(14 marks) 4(b) Draw neat sketches of above mentioned jackets.(6 marks) 5(a) Design a pressure vessel subjected to an internal pressure using following data. Design shouls include:
i) Shell thickness
ii) Head thickness.
iii) Flanged joint between shell and head
i) Shell and standard torispherical head:
Design pressure = 2N/mm2
Outer diameter of shell=1500 mm
Permissible stress for shell and head material=140 N/mm2
Crown Radius for head=1450mm
Corrosion allowance=1.5 mm
(ii) Flanged joint:
Minimum design gasket seating stress=52.5 N/mm2
Flange material same as shell material
Permissible stree for bolt material=140 N/mm2
Desired bolt spacing = 3 times diameter of bolt.
Take W-1.77 for standard torispherical head.
Use M27 size bolts.(14 marks) 5(b) Draw to recommended scale, the above designed cylindrical pressure vessel.(6 marks) 6(a) Explain various metal forming techniques.(6 marks) 6(b) Non destructive tests.(6 marks) 6(c) Write a note on supports for horizontal vessels.(8 marks)