METHOD FOR REMOVING DEPOSIT IN JACKET AND DEVICE FOR REMOVING DEPOSIT IN JACKET

PROBLEM TO BE SOLVED: To provide a technique for effectively removing deposits in a jacket.SOLUTION: The method for removing deposits in a jacket includes: inserting a self-propelling type cylindrical extensible body 4 which is constituted of a plurality of elastic bodies which expand in a radial direction and contract in an axial direction by pressurization, and which self-propels by a peristaltic movement mechanism into a jacket 2 arranged at the outer periphery of a pressure container 3 for allowing a heat medium such as hot water or a cooling medium such as cold water to flow; and cutting and removing deposits adhered to the inside of the jacket having intervals of 20 to 100 mm. The method includes the processes of: making the self-propelling type cylindrical extensible body self-propel to the work place of the cutting and removal of deposits by giving peristaltic movement to the self-propelling type cylindrical extensible body; performing a cutting and removal work by making at least one elastic body of the self-propelling type cylindrical extensible body expand in the radial direction such that the intervals in the jacket are closed to secure the footing of the cutting and removal work at the work place of cutting and removal; and making the elastic body which has been expanded to the radial direction contract after the cutting and removal work, and making the self-propelling type cylindrical extensible body self-propel by giving the peristaltic movement again.