A once-through thermosiphon reboiler was starved of liquid because the overflow weir of the trapout pan feeding the reboiler was level with a seal pan weir.Liquid bypassed the trapout pan.

• 单程热虹吸式再沸器液量不足的原因是为再沸器提供液流的袂液盘的溢流堰高度与受液盘的堰高持平，液流走了袂液盘的旁路。