JPS5747864A - Preventing method for red water in service water pipe - Google Patents
Preventing method for red water in service water pipeInfo
- Publication number
- JPS5747864A JPS5747864A JP12160380A JP12160380A JPS5747864A JP S5747864 A JPS5747864 A JP S5747864A JP 12160380 A JP12160380 A JP 12160380A JP 12160380 A JP12160380 A JP 12160380A JP S5747864 A JPS5747864 A JP S5747864A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- water
- red
- zinc
- soln
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Chemically Coating (AREA)
Abstract
PURPOSE: To prevent the production of red water without charging a chemical agent by circulating a plating soln. through a water pipe after removing rust so as to form a zinc coat on the inner wall of the pipe.
CONSTITUTION: Red rust in each pipe 9 is thoroughly removed with a washing pipe, and the pipe 9 is well washed and dried with warm air so as to adjust the internal temp. of the pipe to the chemical reduction plating temp. of zinc. A plating soln. 12 in a vessel 2 heated with a heater 3 in a casing 1 is injected into the pipe 9 with a pump 4 and returned to the vessel 2 through a circulation pipe 10. The composition of the soln. 12 consists of 30g/l ZnSO4, 30g/l arsenic oxide, 60g/l NaH2PO2, 7.5g/l NaOH, 60g/l NH3, 60g/l NaCN and 60g/l sodium citrate. When the internal temp. of the pipe 9 reaches about 80W90°C, zinc is deposited by reduction on the inner wall of the pipe to form a plated layer having the desired thickness.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12160380A JPS5747864A (en) | 1980-09-02 | 1980-09-02 | Preventing method for red water in service water pipe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12160380A JPS5747864A (en) | 1980-09-02 | 1980-09-02 | Preventing method for red water in service water pipe |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5747864A true JPS5747864A (en) | 1982-03-18 |
Family
ID=14815334
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12160380A Pending JPS5747864A (en) | 1980-09-02 | 1980-09-02 | Preventing method for red water in service water pipe |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5747864A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6818313B2 (en) | 2002-07-24 | 2004-11-16 | University Of Dayton | Corrosion-inhibiting coating |
-
1980
- 1980-09-02 JP JP12160380A patent/JPS5747864A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6818313B2 (en) | 2002-07-24 | 2004-11-16 | University Of Dayton | Corrosion-inhibiting coating |
US7537663B2 (en) | 2002-07-24 | 2009-05-26 | University Of Dayton | Corrosion-inhibiting coating |
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