blow-off line
... 放水沟 gutter ; surface ditch ; relief ditch ; Ditch relief 放水管道 blow-off line 放水冷却 tap water cooling ...
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放射状出水管道区 radial apochete
叙述了蒸汽管道、锅筒、给水管道、省煤器。锅筒放水管、分汽缸等发生水冲击的基本原理，产生原因和预防措施。
The author described philosophy, causes and precautions for water hammer appearance in steam piping, drum, feedwater piping, economizer, drum draining tube, sub-steam cylinder etc.
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