METHOD FOR LINING PIPE INNER SURFACE IN MULTIBRANCH PIPING

摘要

The present invention provides a method capable of lining a multibranch piping with a coating material within the pot life of the coating material without leaving uncoated area or excessive repeated coating. Lining for a main pipe is performed by pouring the coating material into the main pipe from an end portion of the pipe, and lining for branch pipes is effected by the feed of the coating material and air for each of the branch pipes. A completed time point of lining in each branch pipe is detected by any of the following methods: (A) A method wherein the time required for lining a branch pipe is estimated in advance and upon lapse of the estimated time it is judged that the lining for the branch pipe was completed. (B) A method wherein a change in gas pressure in the main pipe which occurs upon arrival of the coating material at the connection between a branch pipe and the main pipe under the feed of air is detected by a pressure gauge, whereupon it is judged that the lining for the branch pipe was completed. (C) A method wherein when the coating material fed from an end portion of one branch pipe was discharged from another branch pipe located in a position close to the one branch pipe, it is judged that the lining was completed.