To provide a method for cleaning a pipe line, especially removing pollutants sticking to the inner surface of it efficiently.
In a method for removing adherents in the inner surface of a pipe for a contaminated fluid, a chemical cleaning liquid containing organic acid and a reducer is prepared (101), the temperature of it is adjusted to a prescribed one (102) and it is mixed with granular matter (103). Moreover, a cleaning liquid consisting of the chemical cleaning liquid containing the organic acid and the reducer and the granular matter is fluidized in a pipe line to be treated (104), and the chemical cleaning liquid, the granular matter and a clad of pollutants are washed away by fluidizirng the cleaning water in the treated pipe line (105). Then, neutralizing and volume-reduction treatments are given to the used chemical cleaning liquid and cleaning water (106), and the used chemical cleaning liquid, cleaning water and granular matter which have finished the treatments are disposed of as wastes (107).
IZUMIDA TATSUO
OTSUKA HISAO
HITACHI NUCLEAR ENG
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