| 摘要 |
PROBLEM TO BE SOLVED: To wash a pipe line in a lower stream side whose diameter is enlarged by raising the internal pressure in a pig in forcedly feeding so as to expand the pig and sending the pig by pressure, while bringing the outer circumference of the pig in contact with the internal circumference of the pipe line after enlarging. SOLUTION: Gas 5 formed by mixing oxygen and hydrogen is sealed in a space 4b in a pig main body 4a and the pig 4 is expanded to such a diameter as being necessary for washing a pipe by sealed gas pressure 5a. This pig is inserted into an upper stream side A of a sewage force feed pipe line 1 which is subjected to be washed and forcedly fed to the lower stream side B by water pressure so as to wash the pipe. When the pig 4 reaches a section of the large diameter, a radio signal of instructing opening of a valve of a cylinder 4d is transmitted. A receiver receiving it opens the valve of the cylinder 4d, pressured replenishing gas 6 is emitted so as to expand the volume of the pig 4 due to rising of the gas pressure, the expanded pig 4 further sent to the lower stream side B by pressure, while being in contact with the internal circumference of the sewage force feed pipe line 1 having its diameter enlarged in the lower stream side section D. |
