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Trap legs for the collection of condensate from the steam distribution system should be of equal size to the distribution line for sizes up to 4 in. (100 mm), and one or two line sizes smaller for lines of 6 in. (150 mm) or larger. These shall be trapped at the bottom. The line size reduction can be made after the branch to the trap leg.
该段摘自ASME BPE2012版,关于冷凝水集水箱的尺寸设计问题,管径低于100mm的管道,集水箱尺寸应与管径一致,但是下一句就看不懂了,对于大于150mm的管道,one or two line sizes smaller for lines of 6 in. (150 mm) or larger这是什么意思啊?百思不得其解!
恳请高人解答.
@紫苏叶
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