| 摘要 |
PROBLEM TO BE SOLVED: To improve a power for removing scales adhered on a heating tube without increasing jet pressure in a water jet in a heating-tube-washing device. SOLUTION: The device for washing a heating tube is equipped with a washing head 1. In the washing head, an inner tube 3 with the tip end closed is inserted in an outer tube 2 with the tip end closed. Through holes 5, 9 are made respectively in the opposing tube walls of the tubes 2 and 3, a high- pressure water path 15 is provided in the rear end of the tube 3, and a low- pressure water path 13 is provided in the rear end of the tube 2.
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