SEPARATING PIPE

PURPOSE:To separating pipe which allows efficiently back washing and easily liquidtightly shut off a raw liquid side and permeated liquid side from each other at both ends of a tubular member by inserting a tubular membrane into a sheath pipe consisting of a woven fabric or porous sheet. CONSTITUTION:A core bar 3 having a spherical part 31 at its front end is inserted into the tubular semipermeable membrane 1 in order to insert the tubular semipermeable membrane 1 into the sheath pipe 2 if the gap between the sheath pipe 2 and the tubular semipermeable membrane 1 is small. The method of inserting the sheath pipe 2 consisting of the woven fabric or the porous sheet onto the core bar 3 from its spherical part 31 side and removing the core bar 3 after the end of the insertion of this sheath pipe 2 is used. Plural pieces of the tubular membranes inserted into the sheath pipes (separating pipes) A are housed into a cylindrical case 4 and a resin is injected to both ends of the tubular membranes inserted into the sheath pipes to form partition walls 5, 5. A filtrate outlet 40 is provided in the case 4. One end 41 side of the case 4 is used as a raw liquid inlet and the other end 42 side of the case 4 as a concd. liquid outlet. As a result, the sheath pipes 2 reinforce the tubular membranes against the internal pressure and, therefore, the back washing liquid is brought into well contact with the outside surfaces of the membranes.