SEWAGE PIPELINE Russian patent published in 1996 - IPC

FIELD: construction of gravitation pipelines of industrial sewer systems of chemical enterprises. SUBSTANCE: sewage pipeline of the pipe-in-pipe type has plugging fluid pressure in the pipe-to-pipe space not lower than the pressure of in the working inner pipe, that enhances reliability of seal of pipe-to-pipe joints of the pipe-line. Pipeline has working pipe 1, case 2, stuffing box seals 4, branch pipes 6 with plugs 7. Volume 5 and branch pipes 6 are filled with corrosion-resisting fluid. Height of branch pipes ensures in volume 5 hydrostatic pressure required for reliable service of seals 8. EFFECT: higher efficiency. 2 dwg