International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 09 | Sep -2017
p-ISSN: 2395-0072
www.irjet.net
EFFECT OF OPENINGS ON STRESSES IN PRESSURE VESSEL Ms. Nalla Neeraja1, Dr. D.V. Bhope2 1Student, IV Semester M.Tech (CAD/CAM), Rajiv Gandhi College of Engg. Research & Technology, Chandrapur – 442 403 2Professor, Mechanical Engineering Department, Rajiv Gandhi College of Engg. Research & Technology, Chandrapur – 442 403 ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract – This paper deals with the effect of openinsgs on
The diameter of opening is considered as ‘d’, outer diameter of reinforcement around the opening is considered as ‘D’ and height of reinforcement is considered as ‘h’. For the analysis, various ratios of D/d are considered as 1.1, 1.2, 1.3, 1.4 and 1.5 and h/d ratios are considered as 0.1, 0.2, 0.3, 0.4 and 0.5. Fig. 2 shows the CAD model of closed pressure vessel and table 1 gives the properties of material of pressure vessel and reinforcement.
stresses in pressure vessel using Finite Element Method. The study is constrained to only structural analysis. The pressure vessel is subjected to constant internal pressure of 2MPa and supported on two saddle supports. The finite element approach is used to evaluate the stresses in pressure vessel with and without reinforcement around the opening. This analysis revealed that reinforcement reduces the magnitude of stresses in pressure vessel having openings. Keywords: Pressure vessel, Opening, Cylinder, Cover plate
1. INTRODUCTION Tanks, vessel and pipelines that carry, store or receive fluids are called as pressure vessel. A pressure vessel is defined as a container with a pressure differential between inside and outside. The inside pressure is usually higher than outside. In this paper, the stress analysis of pressure vessel with variation in size and number of circular openings with and without reinforcement is carried out. The finite element approach is used to evaluate the stresses in the pressure vessel around the openings by varying the size and number of openings on cylinder and cover plate. Fig. 1 shows the revolved section of pressure vessel. The various geometrical & other parameters considered for analysis are as follows,
Fig.2: CAD Model of Closed Pressure Vessel Table 1: Properties of Material of Pressure Vessel PARAMETER Density
(Kg/m3)
VALUE 7850
Elastic Modulus(GPa)
200
Poission’s ratio
0.3
3. ANALYTICAL & FE ANALYSIS OF CLOSED PRESSURE VESSEL
Length of pressure vessel: 500 mm Diameter of pressure vessel: 250 mm Thickness of wall: 5 mm Internal pressure: 2 MPa Material of pressure vessel: Plain Carbon steel
Circumferential stresses and longitudinal stresses in the pressure vessel are determined analytically and its comparison with FE stresses is given in table 2, which indicates the close agreement between analytical and FE stresses Table 2: Comparison of Analytical and FE Stresses Stresses(MPa)
Analytical
FEM
Maximum Principle
50.52
60.58
Minimum Principle
25.26
32.10
Fig.1: Revolve Section of Pressure Vessel
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