Calculation of local stress in the housing
Thread Content
The pipeline load at the ports on the equipment is used to calculate the local stresses in the shell. If the design pressure of the equipment is specified as either positive pressure or vacuum, and if the positive pressure has been calculated and is greater than 0.1 MPa, is it still necessary to calculate the local stresses in the shell under vacuum conditions? Why?
It is needed. When dealing with positive pressure, what is calculated is the strength issue; whereas when dealing with negative pressure, it is the stiffness issue – they are different calculation methods ； Strength calculation depends only on pressure and diameter (given the material), but when calculating stiffness, the length of the device must be taken into account (and it is quite crucial). It’s a simple example: a bottle of mineral water can be easily deflated by sucking on it, but can you blow it apart?