This article takes the vacuumcolumn equipment for an example to do the external pressed vessel machinery design by using of computer programs.
本文以真空操作塔为例，辅助计算机程序以完成外压容器的机械设计。
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However, vacuumcolumn operations present an arduous environment for efficient fractionation, which makes upgrading product from bottoms to distillate more difficult.
然而，有效馏分的提取会使减压操作处境变得困难，也使塔底物料中蒸馏出更多的产品变得更加困难。
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I sketched in part of the vacuum that's forming in the traditional banking business in my Oct. 27 column, "Why big Banks hate banking."