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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
BE SEMESTER-VII EXAMINATION WINTER 2018
Subject Code: 2170502 Date: 19/11/2018
Subject Name: Process Equipment Design -II
Time: 10:30 AM TO 01:30 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 A reaction vessel is operated at 5 atm absolute and 150OC. The heat of reaction
2583.54 kJ is supplied using the steam at pressure 5 atm gauge. Calculate the
design pressure for wall of reaction vessel and jacket.
03
Compare head thickness for torrispherical and elliptical heads using following data:
Operating pressure 15 Atm;
Crown radius 1000 mm; Knuckle radius 100 mm;
MOC CS 142 N/mm2, CA 2 J 0.85;
Shell ID 1000 mm;
Inside depth of the elliptical dish 200 mm
04
For a fixed conical roof cylindrical storage tank, determine the wall thickness for
following data:
Tank diameter 30 m
Tank height 18 m
Specific gravity 1.24
Slope of conical roof 1/6
Super imposed live load 1250 N/m2
MOC Carbon steel
Maximum allowable stress f 157.5 N/mm2
Density 7.8 gm/cc
Modulus of Elasticity E 2 x 105 N/mm2
Standard plate size available is 6300 x 1800 mm
Type of butt joint double welded butt joint.
07
Q.2 Discuss the tubesheet design. 03
Define the following properties of materials:
Toughness, Hardness, Fatigue, Creep.
04
Calculate the shell thickness based on resultant stress theory for vessel having
inside diameter 3 subjected to internal operating pressure of 7.7 atm g and
400°C temperature. The weight of vessel is 5520 kg. Maximum wind load
applicable to vessel and torque due to offset of piping are 9000 N.m and 625
N.m respectively. The material of construction is CS grade 70 418
N/mm2, FOS with modulus of elasticity 185 x 103 N/mm2, Poisson's ratio
0.32 and corrosion Allowance 2 mm.
07
OR
Discuss the design of structurally supported roof for cylindrical storage vessel. 07
Q.3 Determine the thickness of shell of distillation column at various heights
based on following data.
Shell O.D. at top 2000 mm
Length of Shell 27 m
Internal design pressure 3 kgf/cm2
Design temperature 120 °C
Shell Material SA-283 Grade C
Type of shell plate joint Double welded butt joint with 10%
radiography
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Skirt height 4 m
Tray spacing 0.3 m
Top disengaging space 1.2 m
Weight of head 317 kg
Weight of one tray plus wt. of liquid over the same =120 kg/m2
Wt. of attachments (pipes, ladders platforms) 150 kg/m
Wind pressure 130 kgf/m2
Insulation thickness 100 mm
Density of insulation 500 kg/m3
Maximum allowable stress of shell material at 120 °C 890kgf/cm2
Modulus of elasticity 2 x 106 kgf/cm2
Poisson's ration 0.3
Corrosion allowance 2 mm
Specific gravity of SA-283 Grade C 7.865
Neglect the stress created by eccentric load and seismic load.
OR
Q.3 Derive the equation for longitudinal and axial stresses generated due to
operating pressure in cylindrical vessel.
03
Discuss various types of jackets with neat sketch. 04
Discuss the design of Tray and tray support in detail. 07
Q.4 Discuss the calculation of tube side pressure drop for shell and tube heat
exchanger.
03
Discuss the design of half coil and plain jacket. 04
Design a bracket of the support welded on outside surface of the shell, to
support a vertical cylindrical reaction vessel based on following available
details:
OD of reactor shell 1.3 m
Thickness of the shell =12 mm
Height of the vessel 2.5m
Clearance from vessel bottom to foundation 1 m
Weight of vessel with contents 3750 kg
Wind pressure 130 kgf/m2
Diameter of bolt circle 1.51 m
Size of base plate for bracket 150 mm x 150 mm
Height of the C channel from foundation 2.625 m
Size of C channel 150 mm x 75 mm
Area of cross section 22 cm2
Modulus of section 24.6 cm3
Radius of gyration 2.43 cm
MOC for support IS 800
Max. allowable tensile stress 1400 kgf/cm2
Max. allowable compressive stress 1233 kgf/cm2
Max. allowable bending stress 1575 kgf/cm2
07
OR
Q.4 Discuss the calculation of shell side pressure drop for shell and tube heat
exchanger.
03
A flat blade turbine agitator with six blades is installed centrally in vertical tank. The
tank is 1.5 m in diameter; turbine is 0.5 m in diameter. Based on the given following
data, Suggest Rated power required for motor to run agitator.
Height of liquid in tank 1.5 m
Viscosity of liquid 20 cp
Density of liquid 1200 kg/m3
Speed of agitator 120 rpm
Length of agitator shaft between bearing and agitator 2 m
For NRe >10000 Np and NRe <10000 Np
04
Discuss the design of skirt support for tall vertical vessel. 07
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Q.5 For reaction vessel, discuss design calculations for following components used
for the flange connecting head and shell
Gasket 03
Bolts 04
Flange diameter and thickness. 07
OR
Q.5 Discuss the selection criteria for nozzles. 03
Classify the flanges based on its facings and give application for each. 04
Examine the data given below to evaluate the requirement of compensation
for the nozzle opening in a cylindrical shell. If compensation ring
(Reinforcement pad) is required then find its dimensions and weight.
Outside diameter of shell 2 m
Max. Working pressure within shell 3.5 MN/m2
Wall thickness for the shell 0.05 m
Corrosion allowance 3 mm
Joint efficiency 1 (for shell and nozzle)
MOC of shell, nozzle and reinforcement pad IS 2002
Density of IS 2002 7800 kg/m3
Allowable stress of IS 2002 96 MN/m2
OD of nozzle (seamless) 0.25 m
Nozzle wall thickness 0.016 m
Length of nozzle 100 mm
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