CN211445905U - Small-caliber heat exchange tube cathode protection potential measuring device - Google Patents
Small-caliber heat exchange tube cathode protection potential measuring device Download PDFInfo
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- CN211445905U CN211445905U CN202020093061.8U CN202020093061U CN211445905U CN 211445905 U CN211445905 U CN 211445905U CN 202020093061 U CN202020093061 U CN 202020093061U CN 211445905 U CN211445905 U CN 211445905U
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Abstract
A cathodic protection potential measuring device for a small-caliber heat exchange tube comprises a heat exchange tube with an opening on the outer wall; the metal pipe hoop compresses the sealing rubber gasket and the pressing block which are arranged at the upper end of the hole-opening part of the heat transfer pipe; the potential test probe sequentially passes through the metal pipe hoop, the pressing block, the sealing rubber gasket and the small hole reserved for processing the heat exchange pipe and extends into the heat exchange pipe; the upper end of the potential test probe is connected with the inlet of the needle valve; the lower end of the drainage tube is connected with the outlet of the needle valve; one end of the flow guide pipe is directly arranged on the drainage pipe, and the other end of the flow guide pipe is placed into the electrode cup; a reference electrode is also placed in the electrode cup; the heat exchange tube and the reference electrode are connected with a potential tester through a lead; in the test process, after the working medium in the heat exchange tube forms a flowing condition, slightly opening the needle valve to enable the working medium in the tube to slowly flow into the electrode cup, opening the potential tester and recording potential test data; the utility model discloses measuring device is reliable and easily realize, has solved small-bore pipeline cathodic protection current potential measuring's problem.
Description
Technical Field
The utility model belongs to the technical field of cathodic protection measures, concretely relates to small-bore heat exchange tube cathodic protection potential measuring device.
Background
Cathodic protection is a common corrosion protection method for service equipment in a seawater environment. Copper alloy and titanium are commonly used as heat exchange tube materials for heat exchange cooling equipment of coastal thermal power plants and ships. In order to control corrosion of heat exchange tubes, tube sheets and heat exchanger housings, cathodic protection is often employed to protect the equipment. In the cathode protection design, the protection range of the cathode protection on the length of the heat exchange tube is generally considered to be smaller than 12 times of the diameter of the heat exchange tube. However, the range of cathodic protection follows ohm's law with voltage drop Δ U — RI, where R is the seawater resistance and current I is controlled by the cathodic reaction rate of electrochemical corrosion. When seawater in the heat exchange tube is in a high-speed flowing condition, the cathode reaction speed generated on the surface of the heat exchange tube is high, the length protection range of the heat exchange tube by cathode protection is small and is smaller than 12 times of the diameter of the heat exchange tube. However, when the seawater in the tube is in a static state, the cathodic oxygen absorption reaction on the surface of the heat exchange tube is reduced along with the reduction of the dissolved oxygen concentration of the seawater in the tube, and the cathodic protection range of the heat exchange tube, namely the length of the heat exchange tube, by cathodic protection is far more than 12 times of the diameter of the heat exchange tube. The actual cathodic protection range needs to be determined through experimental research, how to design a measuring device to meet the sealing and insulating requirements, and finally, the measurement of the cathodic protection potential of the heat transfer tube is realized, so that certain technical difficulties exist.
Disclosure of Invention
In order to solve the problems existing in the prior art, the utility model aims to provide a small-caliber heat exchange tube cathodic protection potential measuring device, which is reliable and easy to realize, and solves the problem of small-caliber pipeline cathodic protection potential measurement.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a cathodic protection potential measuring device for a small-caliber heat exchange tube comprises a heat exchange tube 1 with an opening on the outer wall, a sealing rubber mat 2 and a pressing block 3 which are arranged at the upper end of the opening part of the heat exchange tube, a metal tube hoop 4 with a hole is processed in advance to tightly press the sealing rubber mat 2 and the pressing block 3, a potential test probe 5 sequentially penetrates through the metal tube hoop 4, the pressing block 3, the sealing rubber mat 2 and the reserved small hole of the heat exchange tube 1 to extend into the heat exchange tube 1, the potential test probe 5 is connected with the pressing block 3 through threads to realize sealing between the two, a compression nut 6 tightly presses the potential test probe 5 and the inlet part of a needle valve 7 to realize connection and sealing between the two, the lower end of a drainage tube 8 is connected with the outlet part of the needle valve 7 and is tightly pressed by the compression nut 6, one end of a flow guide tube 9 made of silicon rubber is, a reference electrode 11 is also placed in the electrode cup 10; the heat exchange tube 1 and the reference electrode 11 are connected with a potential tester 13 through a lead 12. After the device is installed, in the testing process, after the working medium in the heat exchange tube 1 forms a positive pressure condition, slightly opening the needle valve 7, enabling the working medium in the heat exchange tube 1 to slowly flow into the electrode cup 10 through the potential testing probe 5, the needle valve 7, the drainage tube 8 and the flow guide tube 9 in sequence, after the testing end of the reference electrode 11 is immersed into the working medium, opening the potential tester 13, and measuring the cathode protection potential at the opening position of the heat exchange tube 1.
The potential testing probe 5, the needle valve 7 and the drainage tube 8 which are in contact with the working medium in the heat exchange tube 1 are all made of polytetrafluoroethylene, the sealing rubber gasket 2 and the flow guide tube 9 are made of silicon rubber, the electrode cup 10 is a non-conductive commercially available plastic measuring cup, and the pressing block 3 is made of polytetrafluoroethylene.
Compared with the prior art, the utility model, have following advantage:
1) the device is simple to manufacture, convenient to install and easy to realize.
2) The part of the device, which is in contact with the working medium, is made of an organic insulating material, so that the accuracy of a test result is ensured, and the sealing is reliable.
Drawings
Fig. 1 is a schematic structural diagram of the measuring device of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, a cathode protection potential measuring device of a small-caliber heat exchange tube and a using method thereof, firstly, a small hole with proper size is arranged on the outer wall of the heat exchange tube 1; placing a sealing rubber pad 2 made of silicon rubber and a pressing block 3 made of polytetrafluoroethylene on the upper part of a small hole of a heat exchange tube 1, loosening a metal tube hoop 4 with the small hole processed in advance, penetrating through a gap of the heat exchange tube 1, and tightly pressing the heat exchange tube 1, the sealing rubber pad 2 and the pressing block 3, wherein the small holes of the heat exchange tube 1, the sealing rubber pad 2, the pressing block 3, the metal tube hoop 4 and the like are required to be aligned; a compression nut 6 is used for compressing the potential test probe 5 and the inlet part of a needle valve 7 made of polytetrafluoroethylene material; inserting a potential test probe 5 wound with a polytetrafluoroethylene raw material tape into a small hole of a metal pipe hoop 4, and screwing the potential test probe 5 into the small hole of a pressing block 3 by utilizing the thread on the outer wall of the potential test probe 5, so that the potential test probe 5 sequentially penetrates through a sealing foot pad 2 and a heat exchange pipe 1 and extends into the heat exchange pipe 1; the lower end of a polytetrafluoroethylene drainage tube 8 is connected with the outlet part of a needle valve 7 and is compressed by a compression nut 6; one end of a guide pipe 9 made of silicon rubber is directly sleeved on the drainage pipe 8; the other end of the draft tube 9 is placed in the electrode cup 10, and the reference electrode 11 is also placed in the electrode cup 10; the heat exchange tube 1 and the reference electrode 11 are connected with a potential tester 13 through a lead 12. After the device is installed, after the working medium in the heat exchange tube 1 forms a positive pressure condition, slightly opening the needle valve 7, enabling the working medium in the heat exchange tube to slowly flow into the electrode cup 10 through the potential test probe 5, the needle valve 7, the drainage tube 8 and the diversion tube 9 in sequence, after the test end of the reference electrode 11 is immersed into the working medium, opening the potential tester 13, and measuring the cathode protection potential at the opening position of the heat exchange tube 1.
Claims (3)
1. The utility model provides a small-bore heat exchange tube cathodic protection potential measuring device which characterized in that: comprises a heat exchange tube (1) with an opening on the outer wall, a sealing rubber gasket (2) and a pressing block (3) which are arranged at the upper end of the opening part of the heat exchange tube, a metal tube hoop (4) for pressing the sealing rubber gasket (2) and the pressing block (3), a potential test probe (5) sequentially passes through the metal tube hoop (4), the pressing block (3), the sealing rubber gasket (2) and a reserved small hole processed in the heat exchange tube (1) and extends into the heat exchange tube (1), the potential test probe (5) is connected with the pressing block (3) through threads and realizes the sealing between the two, the potential test probe (5) and the inlet part of a needle valve (7) are pressed by a pressing nut (6) and realize the connection and the sealing between the two, the lower end of a drainage tube (8) is connected with the outlet part of the needle valve (7) and is pressed by the pressing nut (6), one end of a flow guide tube (9) made, the other end of the draft tube (9) is placed in the electrode cup (10), and the reference electrode (11) is also placed in the electrode cup (10); the heat exchange tube (1) and the reference electrode (11) are connected with a potential tester (13) through a lead (12).
2. The small-caliber heat exchange tube cathodic protection potential measuring device of claim 1, characterized in that: the potential test probe (5), the needle valve (7) and the drainage tube (8) which are contacted with the working medium in the heat exchange tube (1) are all made of polytetrafluoroethylene.
3. The small-caliber heat exchange tube cathodic protection potential measuring device of claim 1, characterized in that: the sealing rubber gasket (2) and the flow guide pipe (9) are made of silicon rubber, the electrode cup (10) is a non-conductive plastic measuring cup, and the pressing block (3) is made of polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020093061.8U CN211445905U (en) | 2020-01-16 | 2020-01-16 | Small-caliber heat exchange tube cathode protection potential measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020093061.8U CN211445905U (en) | 2020-01-16 | 2020-01-16 | Small-caliber heat exchange tube cathode protection potential measuring device |
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| Publication Number | Publication Date |
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| CN211445905U true CN211445905U (en) | 2020-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020093061.8U Active CN211445905U (en) | 2020-01-16 | 2020-01-16 | Small-caliber heat exchange tube cathode protection potential measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021143170A1 (en) * | 2020-01-16 | 2021-07-22 | 西安热工研究院有限公司 | Device for measuring cathode protection potential of small-caliber heat exchange pipe and usage method |
-
2020
- 2020-01-16 CN CN202020093061.8U patent/CN211445905U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021143170A1 (en) * | 2020-01-16 | 2021-07-22 | 西安热工研究院有限公司 | Device for measuring cathode protection potential of small-caliber heat exchange pipe and usage method |
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