The theoretical calculation results of the torque are listed in the appendix, and the deformation coordination equation is listed. The edge shear force and bending moment are obtained, and the stress distribution curve is 1.
The LPG Storage Tanks for the 2 gas station is the main equipment for the gas conversion of the automobile oil. When the storage tank is filled with the high-pressure combustible gas, it is inflated to the automobile cylinder through it. The gas storage tank is constantly subjected to the alternating load during the working process. In the fatigue failure of the structurally non-continuous gas storage tank, the edge stress of the LPG Storage Tanks must be analyzed and calculated in detail, and the gas storage tank connection is connected according to the stress calculation result. Fatigue check at the edge.
Gas storage tank structure and design parameters The structure of the gas storage tank is mainly composed of a cylindrical cylinder body, a hemispherical sealing head, a shrinking sealing head and the like. The cylindrical cylinder is made of multi-layered structure
The design parameters are the highest working pressure 125, the lowest working pressure, the number of cycles, 42 the stress analysis of the connecting edge of the cylinder and the spherical shell, the coordinates of the connecting edge along the axial direction of the cylinder and the stress classification calculation, and the maximum stress intensity is obtained along the maximum. The strength of the section where the stress intensity is located is evaluated. The load combination coefficient is taken as 1.0, and the result is s, the secondary stress intensity is analyzed. The edge stress analysis of the LPG Storage Tanks for gas station Cao Jianying Xi Zhongping 21. The analysis results show that the specification gas storage tank is connected. The area has a large safety factor for use, meeting the strength and fatigue strength requirements. i Xi Zhongping 1958 male. Gao Shang is currently the deputy chief engineer of the State Department of Mechanical and Electrical Products Filtration Supervision and Inspection Station.
The mechanical structure of the f1 design strength finite element method calculation results The geometry, load characteristics and boundary conditions of the gas storage tank are symmetric to the rotary axis, so the calculation model is constructed according to the axis symmetry, and the grid is divided into grids. Divided into layers along the wall thickness direction, a total of 12,600 units are divided, and the overall deformation of the common tank is expanded. The deformed part is designed and manufactured in the cylinder and the spherical shell in the gas tank. It is important to ensure the smooth transition of the connection edge to the deformation and the stress of the disk 565. From the stress intensity cloud, the maximum value of the stress intensity also appears on the cylinder, and the calculation results of the connection edge are compared with the fatigue strength. The maximum stress intensity difference between the nuclear finite element method and the torque theory is 233, which means that the calculation result of the torque theory is safe. According to the 473295 standard, the edge stress value based on the fatigue strength check is determined by the moment. Theory provided.
The calculation results show that the maximum stress near the joint edge appears on the cylinder. The maximum alternating stress of 1=1813 is the maximum alternating stress intensity. The number of material cycles = 42 0. The allowable stress intensity of the owe is due to the joint. For the same thickness welding, there is no opening pipe near the edge and other structures, the fatigue strength reduction coefficient is 6=2,=3.,9 The connecting edge of the open cylinder and the spherical head meets the fatigue strength requirement.
The stress analysis of the joint edge between the cylinder and the shrinkage port has a torque theoretical calculation result. The connection between the shrinkage port and the cylinder body is first simplified as the connection between the conical head and the cylinder body. The edge effect produced by the connection between the conical head and the barrel body is greater than Other convex heads are accompanied by spherical elliptical discs, etc., so the simplification enhances the edge effect and the calculation result is safe. Calculated by recording.
The maximum stress value appears at the large end of the shrinkage port and the connection edge of the cylinder and occurs on the inner wall of the cylinder. 70,148.681 considers the fluctuating pressure, and the internal bullying is in the direction of stress fluctuation. 18, the maximum principal stress difference during the cycle The fluctuation amount is such that the joint is welded with equal thickness, and there is no opening pipe near the edge. The fatigue strength reduction coefficient is 129 346. The large end of the shrinkage joint and the connecting edge of the cylinder meet the fatigue strength requirement.
Since the stress of the shrinkage port decreases with the decrease of its diameter, the edge stress on the inner wall of the small end of the shrinkage port and the edge of the manhole is the stress fluctuation during the cycle. The main stress fluctuation is the alternating stress amplitude. , l1 0 = 3.35 Ming tightening small end and manhole connection edge to meet the fatigue strength requirements.
In the stress analysis process of the connection edge between the cylinder and the spherical shell of the LPG Storage Tanks and the connection edge between the cylinder and the shrinkage joint, the torque theory and the finite element method are used respectively, although the finite element method can analyze the edge stress. Achieving a fairly accurate degree, but considering that the analytical design criteria for the 73295 steel Pressure Vessel are still using the torque theory for analysis and design, the calculation results obtained by the two methods are analyzed and compared, and at the joint edge The fatigue strength check. The results show that the LPG Storage Tanks of this specification has a large safety factor in the connection edge area, meeting the requirements of strength and fatigue strength.
