排放管线 meaning in English

bleeder line
discharge lines
discharge pipe line
outfall pipeline

In such cases , provision should be made to always vent the drain line above the flood level
在这种情况下，应该采取措施随时对地面排放管线进行排放。
In the case of a pit drain , ensure an adequate air gap exists between the bottom of the drain line and the bottom of the pit
在坑内排放时，请确保在排放管线和坑底部之间有适当的气隙存在。
" install chemical tanks as required , and ensure each dose pump discharge tubing is connected to the manifold injection points provided .
按要求安装化学箱槽时，确保每根加药泵的排放管线与相对应的注入点相连接。