Calculation of allowable bending moment [ML] at the earthing shell of vertical containers

The calculation of the allowable bending moment at the earthing shell of a vertical vessel is a structural design issue that typically involves the design of the connection between the shell and the earthing. Such design calculations require consideration of the stresses acting between the shell and the earpiece, as well as a strength assessment at the design temperature and pressure. Based on the provided data (shell material S30403, design temperature 70°C, allowable stress 120 Mpa, diameter DN4000, shell wall thickness 14 mm, design pressure 0.6 Mpa), if interpolation is to be used to calculate the allowable bending moment at the earthing shell, it is necessary to refer to relevant design codes or standards, such as the ASME Boiler & Pressure Vessel Code and the GB 150 pressure vessel standard. In the absence of specific design standards or guidelines, a basic approach to calculation is provided here: 1. Determine the loads acting on the ear cup, including pressure loads, gravitational loads, and any external loads. 2. Calculate the bending moment acting at the connection between the earthing lug and the housing based on the load and the size of the container. This usually involves mechanical analysis. 3. Determine the allowable stress of the housing material at the design temperature. For specific materials and temperatures, the relevant material property tables can be consulted to obtain the allowable stress values. 4. Use relevant design methods (such as elasticity theory, plasticity theory, or strength theory) to calculate the maximum bending moment that the earthing shell can withstand at this allowable stress. 5. If the allowable bending moment values for containers of similar sizes are known, the allowable bending moment for the container of the desired size can be determined through interpolation. Interpolation usually requires assuming that the allowable stress of the material varies linearly with size or follows some known trend. The above steps provide only a general computational framework. The specific calculation steps and required data may vary depending on the design standards and specifications adopted. In practical design, it is recommended to consult engineers or professionals with experience in pressure vessel design, and to carry out detailed calculations in accordance with the local engineering design codes and regulations. Furthermore, such calculations are usually carried out using computer-aided design (CAD) software or finite element analysis (FEA) software to ensure the accuracy of the calculations and the safety of the design. .

Does the liquid level in the container considered in the calculation of ear-type supports include the height of the head?