Title:
METAL PIPE CLEANING METHOD AND CLEANING DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/067227
Kind Code:
A1
Abstract:
Provided are a metal pipe cleaning method and cleaning device that can maintain a high degree of cleaning performance over a long time. A cleaning method for a metal pipe (2) comprises: a storage step of storing a cleaning liquid (3) in a cleaning tank (10); an immersion step of immersing the metal pipe (2) into the cleaning liquid (3) in the cleaning tank (10) while generating fine bubbles by bubbling dissolved gas into the cleaning liquid (3) in the cleaning tank (10) and emitting ultrasonic waves into the cleaning liquid (3) in the cleaning tank (10); a supply step of supplying new cleaning liquid (3) to the cleaning tank (10); and a discharge step of discharging, from the cleaning tank (10), an amount of the cleaning liquid (3) that corresponds to the height above a reference liquid level (S) when the liquid level of the cleaning liquid (3) exceeds the reference liquid level (S) in the cleaning tank (10).
Inventors:
KANATANI TORU (JP)
TAKAGI TAKAMITSU (JP)
DATE HIROMITSU (JP)
HOSHIBA ERI (JP)
TAKAGI TAKAMITSU (JP)
DATE HIROMITSU (JP)
HOSHIBA ERI (JP)
Application Number:
PCT/JP2019/037730
Publication Date:
April 02, 2020
Filing Date:
September 26, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B08B3/12
Domestic Patent References:
| WO2018169050A1 | 2018-09-20 |
Foreign References:
| JPH0839025A | 1996-02-13 | |||
| JP2016036785A | 2016-03-22 | |||
| JP2007029944A | 2007-02-08 |
Other References:
See also references of EP 3858501A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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