Calculation of pressure resistance for equipment manholes
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Dear sea friends, I have a piece of equipment here that requires a manhole to be replaced, but I’m not sure how to determine the required thickness for such a manhole. Can a steel plate with a thickness of 30 mm withstand a pressure of 0.78 MPa? Please provide the calculation method, thank you
Refer to chemical processing equipment; it contains information on manhole design.
For such thick steel plates, 7.8 MPa is sufficient!
Reinforcement design calculations need to be carried out with professionalism.
If it is not a standard manhole, strength calculation is essential. It can be carried out using the strength calculation formulas specified in GB150; in other words, the manhole cylinder is treated as a device cylinder for calculation and stress verification, which is no different from ordinary strength calculations. However, I recommend using a standard manhole, as this facilitates maintenance, replacement, and the interchange of materials. With a standard manhole, there is no need to create drawings either.
Standard options can be used; if not standard, a flat-roof calculation method can also be employed
The thickness of the manhole spool is easy to address; the key lies in the reinforcement calculation for the opening in the manhole, and that is what truly matters.
The key is the thickness of the manhole spool, which addresses the issue of reinforcement for the opening; as for the manhole flange/manhole cover and the standards for selecting fasteners, those can be chosen according to relevant specifications.