Flat cover opening reinforcement
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How should the reinforcement for the under-welded openings in the flat cover be calculated? Is it sufficient that the area of the flat cover involved in the reinforcement is greater than the required reinforcement area, without taking into account the reinforcement area of the pipe connections?
According to GB150, no connections are taken into account; only flat covers are considered. However, it must be ensured that the wall thickness of the take over meets the strength requirements. Additionally, small holes in some flat covers also do not need to be calculated.
Is it a rule that a small hole in a flat cover does not require calculation and is set at 150?
For flat-gasketed small holes, no calculation is required; this is not stipulated in GB/T150, but rather it is part of the requirements for flange gaskets as defined in SH3509. If flange gaskets according to SH3509 are used, no calculation is needed; however, if a flat gasket is designed by oneself, then a calculation is necessary. However, rows of holes cannot be formed on the same flat surface. When the material of the pipe fittings, the wall thickness, and the protrusion length are all the same, if the calculation for large holes is successful, then the calculation for small holes will also be successful, and thus no further calculation is necessary.