帮理解一下这句话? for columns one vapour-line running down from the top head nozzle to the lower tangent line shall be considered, with an increased diameter to include insulation. 塔设备应考虑一根从顶封头接管向下连接到下(封头)切线的排气管,直径要包括保温层厚度. 这是塔设备计算时要考虑最大迎风截面,即考虑塔直径外,还要考虑管线,当然都要考虑由于保温而使截面增加. [ ]查看更多