CN111118502A - Small-caliber heat exchange tube cathode protection potential measuring device and using method - Google Patents

Small-caliber heat exchange tube cathode protection potential measuring device and using method Download PDF

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Publication number
CN111118502A
CN111118502A CN202010046765.4A CN202010046765A CN111118502A CN 111118502 A CN111118502 A CN 111118502A CN 202010046765 A CN202010046765 A CN 202010046765A CN 111118502 A CN111118502 A CN 111118502A
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China
Prior art keywords
heat exchange
exchange tube
potential
tube
small
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CN202010046765.4A
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Chinese (zh)
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CN111118502B (en
Inventor
刘锋
曹杰玉
刘永兵
朱涛
姚建涛
文慧峰
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Xian Thermal Power Research Institute Co Ltd
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Thermal Power Research Institute
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Publication of CN111118502A publication Critical patent/CN111118502A/en
Priority to PCT/CN2020/115405 priority patent/WO2021143170A1/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/22—Monitoring arrangements therefor
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
    • C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
    • C23F2213/32—Pipes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

A cathodic protection potential measuring device for a small-caliber heat exchange tube and a using method thereof are disclosed, wherein the device 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 measuring device is reliable and easy to realize, and solves the problem of the cathodic protection potential measurement of the small-caliber pipeline.

Description

Small-caliber heat exchange tube cathode protection potential measuring device and using method
Technical Field
The invention belongs to the technical field of cathodic protection measurement, and particularly relates to a cathodic protection potential measurement device for a small-caliber heat exchange tube and a use method.
Background
The cathodic protection is generally considered to be smaller in the length protection range of the heat exchange tube by the cathodic protection and smaller than 12 times of the diameter of the heat exchange tube in order to control the corrosion of the heat exchange tube, a tube plate and a heat exchanger shell, wherein R is a seawater resistor, and current I is controlled by the cathodic reaction speed of electrochemical corrosion.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a device for measuring the cathodic protection potential of a small-caliber heat exchange tube and a using method thereof.
In order to achieve the purpose, the invention 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 11 is a non-conductive commercially available plastic measuring cup, and the pressing block 3 is made of polytetrafluoroethylene.
Compared with the prior art, the invention has the following advantages:
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 view of the structure of the measuring device of the present invention.
Detailed Description
The invention is further described with reference to the following figures 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 (4)

1. 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 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 penetrates through the metal tube hoop (4), the pressing block (3), the sealing rubber gasket (2) and the heat exchange tube (1) to process reserved small holes and extends 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 metal tube hoop and the pressing block, the potential test probe (5) and an inlet part of a needle valve (7) are pressed by a pressing nut (6) to realize connection and sealing between the metal tube and the pressing block, the lower end of a drainage tube (8) is connected with an outlet part of the, one end of a honeycomb duct (9) made of silicon rubber is directly sleeved on the drainage tube (8), the other end of the honeycomb duct (9) is placed in the electrode cup (10), and 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).
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 (11) is a non-conductive plastic measuring cup, and the pressing block (3) is made of polytetrafluoroethylene.
4. The use method of the small-caliber heat exchange tube cathodic protection potential measuring device as recited in claim 1, is characterized in that: in the testing process, after the working medium in the heat exchange tube (1) forms a positive pressure condition, the needle valve (7) is slightly opened, the working medium in the heat exchange tube (1) sequentially passes through the potential testing probe (5), the needle valve (7), the drainage tube (8) and the guide tube (9) and flows into the electrode cup (10), the testing end of the reference electrode (11) is immersed into the working medium, and then the potential tester (13) is opened to measure the cathodic protection potential at the opening position of the heat exchange tube (1).
CN202010046765.4A 2020-01-16 2020-01-16 Small-caliber heat exchange tube cathode protection potential measuring device and using method Active CN111118502B (en)

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Application Number Priority Date Filing Date Title
CN202010046765.4A CN111118502B (en) 2020-01-16 2020-01-16 Small-caliber heat exchange tube cathode protection potential measuring device and using method
PCT/CN2020/115405 WO2021143170A1 (en) 2020-01-16 2020-09-15 Device for measuring cathode protection potential of small-caliber heat exchange pipe and usage method

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CN202010046765.4A CN111118502B (en) 2020-01-16 2020-01-16 Small-caliber heat exchange tube cathode protection potential measuring device and using method

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CN111118502A true CN111118502A (en) 2020-05-08
CN111118502B CN111118502B (en) 2023-03-21

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Cited By (1)

* Cited by examiner, † Cited by third party
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

Citations (8)

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Publication number Priority date Publication date Assignee Title
JPH1019825A (en) * 1996-07-04 1998-01-23 Hitachi Ltd Potential measuring device and electricity generating plant piping system
CN101074917A (en) * 2007-06-20 2007-11-21 中国船舶重工集团公司第七二五研究所 Method and apparatus for testing metal material deep-sea corrosion potential
CN202214419U (en) * 2011-08-05 2012-05-09 北京科技大学 Multifunctional cathode protection test probe
RU2011121760A (en) * 2011-05-31 2012-12-10 Наталия Каюмовна Шамшетдинова DEVICE FOR MEASURING POLARIZATION POTENTIAL OF PIPELINES
CN102912356A (en) * 2011-08-05 2013-02-06 北京科技大学 Multifunctional catholic protection test probe and test method
CN106835150A (en) * 2017-03-07 2017-06-13 佛山市天然气高压管网有限公司 A kind of cathodic protection system polarization potential measuring instrument and evaluation method
CN206580888U (en) * 2017-03-07 2017-10-24 佛山市天然气高压管网有限公司 A kind of cathodic protection system polarization potential measuring instrument
CN111650117A (en) * 2020-06-28 2020-09-11 中山大学 Simulation heat-transfer pipe corrosion experiment and normal position electrochemistry testing arrangement

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CN104419937B (en) * 2013-09-06 2017-02-22 中石化洛阳工程有限公司 Method and device for testing cathode protection potential of inner base plate of oil tank
US9441307B2 (en) * 2013-12-06 2016-09-13 Saudi Arabian Oil Company Cathodic protection automated current and potential measuring device for anodes protecting vessel internals
CN105887096A (en) * 2016-04-27 2016-08-24 天津智晟济科技发展有限公司 Alternating current-direct current channel separation type intelligent cathodic protection potential data acquisition instrument
CN109881203A (en) * 2019-03-27 2019-06-14 中国石油工程建设有限公司北京设计分公司 A kind of closed tank cathodic protection potential monitoring device
CN110118722A (en) * 2019-06-04 2019-08-13 安科工程技术研究院（北京）有限公司 The monitoring of storage tank bottom cathodic protection potential and early warning system and method
CN211445905U (en) * 2020-01-16 2020-09-08 西安热工研究院有限公司 Small-caliber heat exchange tube cathode protection potential measuring device
CN111118502B (en) * 2020-01-16 2023-03-21 西安热工研究院有限公司 Small-caliber heat exchange tube cathode protection potential measuring device and using method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1019825A (en) * 1996-07-04 1998-01-23 Hitachi Ltd Potential measuring device and electricity generating plant piping system
CN101074917A (en) * 2007-06-20 2007-11-21 中国船舶重工集团公司第七二五研究所 Method and apparatus for testing metal material deep-sea corrosion potential
RU2011121760A (en) * 2011-05-31 2012-12-10 Наталия Каюмовна Шамшетдинова DEVICE FOR MEASURING POLARIZATION POTENTIAL OF PIPELINES
CN202214419U (en) * 2011-08-05 2012-05-09 北京科技大学 Multifunctional cathode protection test probe
CN102912356A (en) * 2011-08-05 2013-02-06 北京科技大学 Multifunctional catholic protection test probe and test method
CN106835150A (en) * 2017-03-07 2017-06-13 佛山市天然气高压管网有限公司 A kind of cathodic protection system polarization potential measuring instrument and evaluation method
CN206580888U (en) * 2017-03-07 2017-10-24 佛山市天然气高压管网有限公司 A kind of cathodic protection system polarization potential measuring instrument
CN111650117A (en) * 2020-06-28 2020-09-11 中山大学 Simulation heat-transfer pipe corrosion experiment and normal position electrochemistry testing arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
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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