CN113549918A - Contact type measuring device and method for sacrificial anode cathodic protection state of offshore submarine pipeline - Google Patents
Contact type measuring device and method for sacrificial anode cathodic protection state of offshore submarine pipeline Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004210 cathodic protection Methods 0.000 title claims abstract description 14
- 239000000523 sample Substances 0.000 claims abstract description 61
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 239000013535 sea water Substances 0.000 claims description 12
- 230000005684 electric field Effects 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000011156 evaluation Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000009933 burial Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- C23F2213/31—Immersed structures, e.g. submarine structures
-
- 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
Abstract
The invention relates to a contact type measuring device and a method for the sacrificial anode cathodic protection state of an offshore submarine pipeline, which comprises a detection rod and a data collector, wherein the bottom end of the detection rod is connected with a measuring probe in an insulating way, the top end of the detection rod is fixedly connected with a handle capable of pressing down the detection rod, a lower reference electrode and an upper reference electrode which are arranged at a distance from each other from top to bottom and the ends of which are exposed are arranged on the detection rod in an insulating way, the measuring probe, the lower reference electrode and the upper reference electrode are respectively connected with the data collector through lines, and the periphery of the upper part of the tip of the measuring probe is insulated by a heat shrinkage sleeve. The method can realize the measurement of the cathode protection potential and the sacrificial anode working potential of the submarine pipeline along the offshore submarine pipeline routing direction, and calculate the submarine pipeline protection current density and the size and the direction of the sacrificial anode output current according to the relation between the potential gradient and the medium resistivity, and judge the position of the anode according to the value, thereby realizing the effectiveness evaluation of the offshore submarine pipeline sacrificial anode and the cathode protection system and the prediction of the anode residual life.
Description
Technical Field
The invention relates to the technical field of marine pipeline corrosion prevention, in particular to a contact type measuring device and method for the sacrificial anode cathode protection state of an offshore submarine pipeline, which are provided for a special environment with low underwater visibility and deep buried in offshore submarine sea mud.
Background
Since the submarine pipeline is susceptible to seawater or sea mud corrosion, a combined protection method of an anticorrosive coating and sacrificial anode cathodic protection is generally adopted. When the submarine pipeline anticorrosive coating is damaged and the pipe body is exposed to failure, the sacrificial anode provides a cathodic protection current density for the pipe body at the damaged position of the pipeline anticorrosive coating through seawater and sea mud media around the submarine pipeline, so that the pipeline is protected by a certain cathode.
After the anticorrosion coating and the cathode protection system are invalid, the submarine pipeline can be directly corroded by seawater and sea mud, once corrosion perforation occurs, normal transportation of offshore oil and natural gas is directly influenced, a vicious event of oil gas leakage can be caused, unnecessary economic loss, energy waste and environmental pollution are caused. Therefore, the consumption state of the sacrificial anode of the submarine pipeline, the protection potential of the cathode of the submarine pipeline and the protection current density must be detected regularly, the corrosion protection state of the submarine pipeline is effectively evaluated, and the safe and stable operation of the submarine pipeline is ensured.
The current detection technology is generally divided into contact detection and non-contact detection. The existing contact detection method mainly comprises the steps that an underwater robot or a diver dives to the position near a submarine pipeline, and a measuring probe is used for directly measuring the protection potential at the position of an unburied pipeline (bare drain). For pipelines buried by sea mud, the sea mud needs to be swept to expose partial pipe sections, so that contact measurement can be carried out by using a probe. Currently, a measuring device used based on a contact detection technology, such as a crawler-type submarine pipeline sacrificial anode detection device, has an underwater motion system maximally close to a pipeline on a seabed, and the measuring system is fixed on the motion system to detect magnetic field information and electric potential conditions of the pipeline. The device is suitable for detecting the submarine pipeline which is laid on the seabed and is not buried by sea mud, and for the submarine pipeline which is buried by sea mud in the offshore region deeply, the limitation is that a motion system cannot directly move on the surface of the detected pipeline, and a measurement system cannot be close to the pipeline, so that the potential cannot be measured; the device comprises a collector, a control terminal, a platinum electrode, a pressure difference signal acquisition unit, a pressure difference signal amplification unit, a control terminal and a power supply unit. For a submarine pipeline buried deep by offshore mud, the platinum electrode cannot move on the surface of the pipeline buried deep by the offshore mud, and is not suitable for measurement of the offshore submarine pipeline. In addition, for the submarine pipeline with a long measuring period, more high-frequency collected potential data are generated, and processing and analysis are not facilitated. The existing measuring device is only suitable for measuring the submarine pipeline exposed to seawater or not buried by the sea mud because the measuring probe and the electrode are difficult to contact the surface of the submarine pipeline buried by the sea mud.
The potential gradient-based measurement method is essentially to use the measured potential gradient around the pipe to infer the coating damage condition on the surface of the pipe. However, because the submarine pipeline is influenced by the burial depth of the sea mud and the protection of the anticorrosive coating, the probe and the electrode for measuring the potential are limited by the burial depth of the sea mud and are far away from the pipeline, so that the probe and the electrode cannot be close to the pipeline in a short distance, the surrounding electric field is weak, and the protection potential and potential gradient information of the pipeline cannot be accurately measured.
Offshore (shallow sea) seawater is turbid, submarine pipeline routes are buried deep in sea mud, the visibility of the submarine pipeline is almost zero, the detection workload is large, the period is long, the difficulty is high, the detection cost is high, and the environment where the pipeline is located can be damaged in the pipeline excavating and blowing processes, so that the detection result is different from the actual service state.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a contact type measuring device and method for the sacrificial anode and cathode protection state of an offshore submarine pipeline, so as to realize accurate measurement of the sacrificial anode and cathode protection state of the offshore submarine pipeline.
The technical scheme adopted by the invention for solving the technical problems is as follows: a contact type measuring device for the cathode protection state of a sacrificial anode of an offshore submarine pipeline comprises a detection rod and a data acquisition unit, and is characterized in that: the bottom end of the detection rod is connected with a measuring probe in an insulating mode, the top end of the detection rod is fixedly connected with a handle capable of pressing down the detection rod, a lower reference electrode and an upper reference electrode which are arranged at intervals from top to bottom and the ends of which are exposed are arranged on the detection rod in an insulating mode, the measuring probe, the lower reference electrode and the upper reference electrode are respectively connected with a data acquisition unit through lines, and the periphery of the upper portion of the tip end of the measuring probe is insulated through a heat shrinkage sleeve.
Specifically speaking, for improving the whole insulating nature of measuring device, satisfy the offshore pipeline's that the degree of depth differs measurement requirement, the gauge rod include hollow probe rod and lower probe rod, probe rod low side threaded connection has first insulation adapter down, threaded connection has the insulating adapter of second between probe rod low side and the lower probe rod top, measuring probe upper end and first insulation adapter threaded connection, lower reference electrode inlays to be established in first insulation adapter, goes up the reference electrode and inlays to be established in the insulating adapter of second.
In order to avoid the phenomenon that the wires are broken and wound in the dragging process to influence data transmission, the wires of the measuring probe, the lower reference electrode and the upper reference electrode are connected to a data acquisition instrument through inner holes of the detecting rod.
A measuring method adopting the contact type measuring device comprises the following steps:
s1, according to the position of the submarine pipeline route, the detecting rod is extended to the seabed through the handle, and when the measuring probe does not contact the sacrificial anode and the pipeline, the potential reading at the moment is the natural potential of the measuring probe in seawater and sea mud; when the tip of the measuring probe is contacted with the position of the sacrificial anode, the potential reading is the working potential of the sacrificial anode; when the tip of the measuring probe is contacted with the pipeline, the potential reading is the cathodic protection potential of the pipeline, and the positions of the sacrificial anode and the pipeline are judged through the potential reading of the data acquisition unit;
s2, contacting the measuring probe of one measuring device with the sacrificial anode, and enabling the measuring probe of the other measuring device to be close to the outer wall of the submarine pipeline beside the sacrificial anode, wherein the potential reading displayed by the data acquisition instrument is the cathodic protection potential of the submarine pipeline relative to the lower reference electrode;
s3, according to the vertical distance and potential reading of the lower reference electrode and the upper reference electrode, obtaining the potential gradient of the peripheral electric field of the sacrificial anode and the submarine pipeline within a certain range by adopting a direct current potential gradient method, calculating the pipeline protection current density and the sacrificial anode output current according to the relation between the potential gradient and the medium resistivity, and finally predicting the residual life of the sacrificial anode according to the size of the sacrificial anode output current.
Because the protection current distribution on the surface of the submarine pipeline and the aging state (pipeline damage rate and damage point) of the anti-corrosion coating on the pipeline are difficult to directly measure, but the distribution of the environmental electric field around the submarine pipeline measuring point can be directly measured, and the distribution of the environmental electric field around the submarine pipeline measuring point follows ohm's law:
dE/dl＝-ρ×i＝-i/σ
in the formula: dE/dl-potential gradient in the vertical direction of the subsea pipeline, mV/m;
ρ is the dielectric resistivity, Ω · m;
σ -dielectric conductivity, S/m;
i-Current Density flowing there, mA/m2。
The potential gradient in the medium near the damage point of the anticorrosive coating outside the pipeline is in direct proportion to the product of the resistivity and the current density of the medium (seawater and sea mud). According to the distance and the potential difference between the two reference electrodes, the potential gradient in the vertical direction of the pipeline (or anode) measuring point can be obtained, the resistivity and the conductivity of the medium environment (seawater and sea mud) around the submarine pipeline are known, further, the pipeline protection current density and the output current of the sacrificial anode can be obtained, and finally, the residual life of the current sacrificial anode can be predicted according to the output current of the sacrificial anode.
The invention has the beneficial effects that: the measuring probe can easily pierce sea mud to contact the outer surfaces of the sacrificial anode and the submarine pipeline, so that the pipeline is prevented from being dug and swept; the potential gradient method for measuring the offshore submarine pipeline sacrificial anode and the cathode protection system adopts the potential gradient method for measuring the upper and lower reference electrodes, obtains potential gradient information in electric fields with different ranges of measuring points by changing the vertical distance between the upper and lower reference electrodes, overcomes the problem that the distance between the two electrodes is difficult to measure by the prior potential gradient method, realizes the measurement of the submarine pipeline cathode protection potential and the sacrificial anode working potential, and calculates the submarine pipeline protection current density and the sacrificial anode output current according to the relation between the potential gradient and the medium resistivity, thereby carrying out effectiveness evaluation on the offshore submarine pipeline sacrificial anode and cathode protection system and accurately predicting the residual life of the anode.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the measurement state of the present invention.
In the figure: 1. the device comprises a detection rod, 1-1 parts of an upper detection rod, 1-2 parts of a lower detection rod, 2 parts of a data acquisition instrument, 3 parts of a working carrier, 4 parts of a handle, 5-1 parts of a first insulating adapter, 5-2 parts of a second insulating adapter, 6 parts of a measuring probe, 7 parts of a lower reference electrode and 8 parts of an upper reference electrode.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The contact type measuring device and the contact type measuring method for the sacrificial anode cathode protection state of the offshore submarine pipeline as shown in fig. 1 and fig. 2 comprise a detection rod 1 and a data acquisition unit 2, wherein the data acquisition unit 2 is arranged on a working carrier 3, the detection rod 1 comprises a hollow upper detection rod 1-1 and a hollow lower detection rod 1-2, the top end of the upper detection rod 1-1 is fixedly connected with a handle 4 capable of pressing down the detection rod 1, the lower end of the lower detection rod 1-2 is in threaded connection with a first insulating adapter 5-1, and a second insulating adapter 5-2 is in threaded connection between the lower end of the upper detection rod 1-1 and the top end of the lower detection rod 1-2.
The measuring probe 6 is in threaded connection with the first insulating adapter 5-1, the measuring probe 6 is solid pointed hard metal, so that in order to avoid the problem that when the measuring probe 6 contacts the sacrificial anode, the output current of the sacrificial anode excessively flows to the measuring probe 6 and influences the measurement of the protection current density of the submarine pipeline, the contact area of the measuring probe 6 with seawater and sea mud is reduced as much as possible, the shell of the measuring probe 6 is insulated by a heat shrinkable sleeve, waterproof glue is used for sealing gaps, the measuring probe 6 is exposed out of the smaller contact area of the tip, and the upper end of the measuring probe 6 is tapped to facilitate lead-out of a lead.
The detection rod 1 is provided with a lower reference electrode 7 and an upper reference electrode 8 which are arranged at an upper and lower distance in an insulating mode, specifically, the lower reference electrode 7 is embedded in the first insulating adapter 5-1, and the upper reference electrode 8 is embedded in the second insulating adapter 5-2. The lower reference electrode 7 and the upper reference electrode 8 are exposed out of the ends, can be in contact with sea mud or seawater electrolyte environment, and are sealed by waterproof glue at the periphery. The lower reference electrode 7 and the upper reference electrode 8 are vertically arranged up and down and the distance between them can be freely adjusted.
And the wires led out from the measuring probe 6, the lower reference electrode 7 and the upper reference electrode 8 are respectively connected to the data acquisition instrument 2 through the inner hole of the detection rod 1.
The measuring probe 6 and the detecting rod 1 are made of high-strength hard materials, the measuring probe 6 can pierce sea mud, barriers and the like above a pipeline and is suitable for detecting a submarine pipeline with deep sea mud buried offshore, and the first insulating adapter 5-1 and the second insulating adapter 5-2 can be made of high-strength hard plastics.
A contact measurement method for the sacrificial anode cathodic protection state of an offshore subsea pipeline comprises the following steps:
s1, respectively connecting the measuring probe 6, the lower reference electrode 7 and the upper reference electrode 8, leading out a lead upwards from an inner threading hole of the detecting rod 1 to be connected to the data acquisition instrument 2, and sequentially connecting and fixing the measuring probe 6, the first insulating adapter 5-1, the second insulating adapter 5-2, the upper detecting rod 1-1 and the lower detecting rod 1-2 through threads;
s2, after finding the pipeline routing position through the sensing equipment, pressing down the detection rod 1 along the vertical direction of the pipeline routing by using the handle 4, when the measuring probe 6 is not contacted with the sacrificial anode or the pipeline, the potential reading of the data collector 2 is the natural corrosion potential of the measuring probe 6, when the measuring probe 6 is contacted with the sacrificial anode, the reading of the data collector 2 is the potential polarized by the sacrificial anode of the measuring probe 6, when the measuring probe 6 is contacted with the submarine pipeline, the reading of the data collector 2 is the cathode protection potential of the submarine pipeline, and the positions of the sacrificial anode and the pipeline are judged through the potential reading of the data collector 2;
s3, two measuring devices are adopted to measure simultaneously, the measuring probe 6 of one measuring device is contacted with the sacrificial anode, the measuring probe 6 of the other measuring device is close to the outer wall of the submarine pipeline beside the anode, and the potential reading displayed on the data acquisition unit 2 at the moment is the cathodic protection potential of the submarine pipeline relative to the lower reference electrode 7;
s4, measuring along the routing direction of the submarine pipeline, and collecting information such as the working potential of the sacrificial anode, the protection potential of the pipeline, the potential gradient and the like;
s5, the data acquisition unit 2 acquires potential values of the lower reference electrode 7 and the upper reference electrode 8 to obtain a voltage difference between the lower reference electrode 7 and the upper reference electrode 8, and potential gradient information in a range is obtained through a distance between the lower reference electrode 7 and the upper reference electrode 8; obtaining the anode output current and the pipeline protection current density according to the potential gradient value and the medium (sea mud and seawater) resistivity, predicting the current residual life of the sacrificial anode according to the anode output current, and evaluating the current offshore submarine pipeline sacrificial anode cathodic protection state according to the obtained corresponding parameters.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A contact type measuring device for the cathode protection state of a sacrificial anode of an offshore submarine pipeline comprises a detection rod and a data acquisition unit, and is characterized in that: the bottom end of the detection rod is connected with a measuring probe in an insulating mode, the top end of the detection rod is fixedly connected with a handle capable of pressing down the detection rod, a lower reference electrode and an upper reference electrode which are arranged at intervals from top to bottom and the ends of which are exposed are arranged on the detection rod in an insulating mode, the measuring probe, the lower reference electrode and the upper reference electrode are respectively connected with a data acquisition unit through lines, and the periphery of the upper portion of the tip end of the measuring probe is insulated through a heat shrinkage sleeve.
2. The apparatus of claim 1, wherein the apparatus is configured to measure the sacrificial anode cathodic protection status of the offshore subsea pipeline by: the utility model discloses a test device, including the measuring probe, the measuring probe upper end is connected with first insulating adapter, the measuring probe lower end is connected with the insulating adapter of second with lower probe top between the threaded connection, measuring probe upper end and first insulating adapter threaded connection, lower reference electrode inlays to be established in first insulating adapter, go up the reference electrode and inlay to be established in the insulating adapter of second.
3. The apparatus of claim 1, wherein the apparatus is configured to measure the sacrificial anode cathodic protection status of the offshore subsea pipeline by: and the measuring probe, the lower reference electrode and the upper reference electrode are connected with the data acquisition instrument through the inner hole of the detecting rod.
4. A measuring method of a contact measuring device according to claim 1, characterized in that: comprises the following steps:
s1, according to the position of the submarine pipeline route, the detecting rod is extended to the seabed through the handle, and when the measuring probe does not contact the sacrificial anode and the pipeline, the potential reading at the moment is the natural potential of the measuring probe in seawater and sea mud; when the tip of the measuring probe is contacted with the position of the sacrificial anode, the potential reading is the working potential of the sacrificial anode; when the tip of the measuring probe is contacted with the pipeline, the potential reading is the cathodic protection potential of the pipeline, and the positions of the sacrificial anode and the pipeline are judged through the potential reading of the data acquisition unit;
s2, contacting the measuring probe of one measuring device with the sacrificial anode, and enabling the measuring probe of the other measuring device to be close to the outer wall of the submarine pipeline beside the sacrificial anode, wherein the potential reading displayed by the data acquisition instrument is the cathodic protection potential of the submarine pipeline relative to the lower reference electrode;
s3, according to the vertical distance and potential reading of the lower reference electrode and the upper reference electrode, obtaining the potential gradient of the peripheral electric field of the sacrificial anode and the submarine pipeline within a certain range by adopting a direct current potential gradient method, calculating the pipeline protection current density and the sacrificial anode output current according to the relation between the potential gradient and the medium resistivity, and finally predicting the residual life of the sacrificial anode according to the sacrificial anode output current.
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| CN114527161A (en) * | 2022-04-21 | 2022-05-24 | 国机传感科技有限公司 | Potential gradient measuring system |
| CN114855175A (en) * | 2022-04-27 | 2022-08-05 | 北京科技大学 | Traversing transverse dragging type reference electrode system of directional drill |
| CN114875415A (en) * | 2022-04-27 | 2022-08-09 | 北京市燃气集团有限责任公司 | Directional drilling crossing shaft type reference electrode system |
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Cited By (5)
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| CN114875415A (en) * | 2022-04-27 | 2022-08-09 | 北京市燃气集团有限责任公司 | Directional drilling crossing shaft type reference electrode system |
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Application publication date: 20211026 |
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