Calculation of elliptical manholes
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Have you ever designed elliptical manholes or oblong manholes? How to calculate it? I hope for your guidance. I’m dealing with a device with a diameter of 1100, and the cylinder is only 500 long, so it’s not possible to fit a manhole in it. The foreigner’s drawings show an elliptical-shaped hole; I’ve looked up standards for manholes, but the pressure rating of that elliptical shape is not sufficient
The maximum pressure for ellipses can reach 3.82 MPa; you can refer to the boiler manhole devices as a guide for design, in accordance with JB/T2190-93
The poster can design it as a non-standard manhole, but when performing calculations for reinforcement of the opening, the following points should be taken into account: 1. The ratio of the long and short diameters of the elliptical hole. 2. Comparison of the reinforcement range B value with the actual range. 3. Supplementary requirements for non-destructive testing of Class A and B weld joints near manholes.