ASSIGNMENT
Q1: A horizontal vessel has 1.8 m diameter and 8.0 m tangent to tangent length. The vessel has
elliptical heads with major axis to minor axis ratio 2.0. The design pressure is 1.5 kg/cm2. Shell
thickness is 8 mm, while head thickness is 10 mm. The permissible stress of material is 1060
Kg/cm2. The weight of the vessel with all its content is 21500 Kg. Distance of saddle centre line
from shell end A=380 mm, and width as 0.5 m. Calculate the bending moment induced and the
stresses induced in the vessel. Check if following assumed design data, satisfy design stress
condition. (for 𝜃 = 120°, take K1 & K2=1, K5 = 0.76 & K6=0.018)
Q2 A cylindrical vessel of 3 m outside dia and 8m length is supported by 4 lugs. Vessel is filled
with fluid density 870 Kg/m3 upto 5 m height is being operated at MN/m2 . It is covered with flat
head from both end having weight of 12 KN for each head. Take corrosion allowance value as 2
mm. Vessel is made up of IS:2041-1962 20 Mo55and its design temperature is 450°C. The wind
pressure on vessel is 0.9 KN/ m2. The bottom height of vessel from foundation is 1 m. Diameter
of anchor bolt circle is 3.1 m. Take allowable stress for horizontal and gusset plate as 100 MN/m2
. density of shell material is 7600 Kg/m3, value of l=b=h=150 mm, 𝜃 = 60°. Calculate
I)
II)
III)
IV)
Shell thickness
Maximum compression load on each lug
Horizontal and gusset plate thickness
Check for anchor bolt requirement (take A= 5 mm, M=4.119 MNm, Z=0.0002 m3)
Q3 Estimate pipe thickness (in terms of Schedule No) of seamless pipe constructed of steel (σ =
0.00013789515 MN/mm2) used under given condition
Design temperature & Pressure = 260°C, 6.89 MN/m2
Pipe OD= 2 inch, Mill Tolerance 12.05%,
Mechanical and Corrosion Allowance value as 3 mm, Coefficient as 0.4