Epoxy or plastic liming may be cast into the concrete pipe during manufacture;or bitumastic or coal tar epoxy may be painted on the concrete pipe surfaces after installation.

• 可以在制造混凝土管道时将环氧和塑胶衬里浇筑在里面，或在安装后用沥青砂浆或煤焦油屠宰混凝土管的表面。