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针对我厂两台８００×２０１００ｍｍ小直径板式塔开ＤＮ４５０ｍｍ人孔的难题（已超出常规设计规范的规定），参照ＪＢ４７３２－９５《钢制压力容器——分析设计标准》附录Ｊ，对该开孔部位进行了设计计算，解决了设计中的实际问题。
According to our factory two 800 × 20100mm small diameter plate open DN450mm manhole problem (beyond the provisions of the conventional design specifications), refer to JB4732-95 “Steel Pressure Vessel - Analysis Design Standards” Appendix J, the open Hole part of the design calculations to solve the practical problems in the design.