CN116297532A - Method and device for directly observing corrosion phenomenon under heat preservation layer through optical fiber image transmission beam - Google Patents
Method and device for directly observing corrosion phenomenon under heat preservation layer through optical fiber image transmission beam Download PDFInfo
- Publication number
- CN116297532A CN116297532A CN202310076008.5A CN202310076008A CN116297532A CN 116297532 A CN116297532 A CN 116297532A CN 202310076008 A CN202310076008 A CN 202310076008A CN 116297532 A CN116297532 A CN 116297532A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- image transmission
- fiber image
- transmission beam
- insulating layer
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 90
- 230000005540 biological transmission Effects 0.000 title claims abstract description 69
- 230000007797 corrosion Effects 0.000 title claims abstract description 44
- 238000005260 corrosion Methods 0.000 title claims abstract description 44
- 238000004321 preservation Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 239000012774 insulation material Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 13
- 238000000253 optical time-domain reflectometry Methods 0.000 claims abstract description 13
- 238000009413 insulation Methods 0.000 claims description 59
- 230000008859 change Effects 0.000 claims description 45
- 239000000378 calcium silicate Substances 0.000 claims description 14
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 14
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 13
- 150000002910 rare earth metals Chemical class 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 10
- 239000010451 perlite Substances 0.000 claims description 8
- 235000019362 perlite Nutrition 0.000 claims description 8
- 239000011494 foam glass Substances 0.000 claims description 7
- 239000007793 ph indicator Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 4
- 238000010183 spectrum analysis Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 239000011810 insulating material Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000001444 catalytic combustion detection Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 150000000703 Cerium Chemical class 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 150000004673 fluoride salts Chemical class 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- -1 lanthanide series Chemical class 0.000 description 2
- 229910052747 lanthanoid Inorganic materials 0.000 description 2
- 150000002602 lanthanoids Chemical class 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 150000003746 yttrium Chemical class 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 229910001504 inorganic chloride Inorganic materials 0.000 description 1
- 229910001506 inorganic fluoride Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000005433 ionosphere Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000005373 porous glass Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a method and a device for directly observing corrosion phenomenon under an insulating layer through an optical fiber image transmission beam. The method comprises the steps of reserving holes for the optical fiber image transmission bundles to pass through in an insulating layer of an object to be detected, and filling hard heat insulation materials with heat conductivity coefficients not higher than that of the insulating layer material in the holes at the same time, so that the insulating effect of the insulating layer is maintained; when detecting the CUI, taking out the stuffed heat insulation material, and observing by using an optical fiber image transmission beam and combining OTDR equipment or/and spectrum analysis of the optical fiber image transmission beam; the device comprises an annular shell, a heat preservation layer, an optical fiber image transmission beam OTDR tester, a conductive metal sheet and the like, and is used for being placed in a preformed hole of the heat preservation layer to observe corrosion phenomena under the heat preservation layer. The invention provides a method and a device for detecting CUI phenomena of structures such as a fluid conveying pipeline, a building enclosure and the like, which are comprehensive, dynamic and multidirectional, and do not need to dismantle an insulating layer.
Description
Technical Field
The invention relates to the technical field of corrosion monitoring under an insulating layer, in particular to a method and a device for directly observing corrosion phenomenon under the insulating layer through an optical fiber image transmission bundle, and more particularly relates to a method and a device for dynamically and multi-azimuth detecting the CUI phenomenon (corrosion phenomenon under an insulating layer) of a fluid conveying pipeline and a building envelope by using the change of temperature, current intensity and the like of an image transmission optical fiber.
Background
The corrosion under heat insulation (corrosion under insulation, CUI) phenomenon is chemical and electrochemical corrosion phenomenon under the sealed state of the heat insulation, and is a main cause for damage and failure of pipelines and building enclosing structures (walls, roofs and the like), and annual losses of China reach hundreds of billions. For a long time, if the heat preservation and insulation structure is not removed, the CUI phenomenon is difficult to observe and can not be observed dynamically. The CUI has an important characteristic that the added heat-insulating layer can cause a high-temperature and high-humidity closed environment, thereby causing the corrosion to be aggravated. And more serious, the CUI cannot be found in time, because a galvanized iron sheet or an aluminum layer is generally wrapped outside the heat-insulating layer for attractive effect, and plastic is used as a protective layer. Thus, in the early stage of corrosion, it is difficult to observe, and when corrosion under the insulation is found, it is often already serious, and even a safety accident has occurred. In particular, when the operating temperature is below 151 ℃, a certain amount of condensed water tends to be present under the insulation. In addition, the equipment under the insulation layer can also form a microenvironment in which corrosion occurs during the construction period and during regular maintenance time. Therefore, it is necessary to monitor the occurrence of CUI phenomenon in time, thereby making corresponding precautions.
In the conventional visual inspection, due to the blocking of the insulation layer, in order to perform visual inspection on the CUI phenomenon, the insulation layer must be removed first and then visually inspected, and the insulation layer must be covered again after inspection and maintenance, which requires a large amount of man-hours and huge costs. Therefore, it is important to develop some techniques for realizing CUI detection without dismantling the thermal insulation system. To date, various non-destructive guided techniques for CUI inspection of pipes or equipment have been developed (non-destructive instruction technique). For example, ultrasonic detection, ray detection, eddy current detection and the like, but the methods can only detect a certain index singly, and cannot carry out multi-azimuth detailed observation and comprehensive understanding on the CUI phenomenon. Therefore, it is necessary to provide a method and a device for detecting CUI phenomena of structures such as fluid conveying pipelines, building enclosures and the like, which are comprehensive, dynamic and multidirectional, and do not need to dismantle an insulating layer.
Disclosure of Invention
The invention aims to overcome the defects and the shortcomings in the prior art and provides a method for directly observing corrosion phenomena under an insulating layer through an optical fiber image transmission beam.
A second object of the present invention is to provide a device for directly observing CUI phenomenon through an optical fiber image-transmitting bundle.
The above object of the present invention is achieved by the following technical solutions:
a method for directly observing corrosion phenomenon under an insulating layer through an optical fiber image transmission beam is characterized in that a hole for the optical fiber image transmission beam to pass through is reserved in the insulating layer of an object to be detected, a hard heat insulation material with a heat conduction coefficient not higher than that of the insulating layer material is filled in the hole at the same time, and the insulating effect of the insulating layer is maintained; when detecting the CUI, the stuffed heat insulation material is taken out, the optical fiber image transmission beam is utilized to pass through the heat insulation layer to directly observe the appearance change of the outer surface of the object to be detected under the heat insulation layer, meanwhile, the optical fiber image transmission beam is utilized to observe the appearance change of the heat insulation material in the heat insulation layer, the optical fiber image transmission beam and the OTDR tester are utilized to measure the temperature change of the surface of the object to be detected, and after the detection is finished, the heat insulation material is stuffed.
The optical fiber image transmission beam is a passive device capable of transmitting images in random bending, and is formed by regularly arranging a plurality of optical fibers into a beam, each optical fiber is a pixel, information can be independently transmitted, and crosstalk does not exist between the optical fibers. One feature of the optical fiber image-transmitting bundle is that the image can be divided, synthesized and transformed by different arrangements of optical fibers, for example, one end of the optical fiber bundle is arranged in a circular or square shape, and the other end of the optical fiber bundle is arranged in a straight line, so that the two-dimensional image is unfolded into one dimension, and therefore, the optical fiber image-transmitting bundle has some unique applications. In the fields of industry, scientific research and the like, a plurality of cheap small CCDs can be spliced into a large array CCD by adopting an optical fiber image transmission beam, and the large array CCD can be used for replacing an expensive inlet piece. The thickness of the heat insulation layer of the building enclosure structure and the equipment pipeline is 5-25 cm (depending on the internal and external temperature and the heat conductivity coefficient of different heat insulation materials), and the visible distance of the optical fiber image transmission beam is more than several meters. In the range of tens of cm, the corrosion condition of the surface of the object to be insulated can be carefully observed as the naked eye (through a magnifying glass). The invention can directly observe the shape change of the object to be detected and/or the material of the heat preservation layer through the optical fiber image transmission beam, thereby reflecting the corrosion condition.
The distributed optical fiber temperature measurement technology consisting of the optical fiber image transmission beam and the OTDR equipment or/and the spectrum analysis is rapidly developed in nearly two thirties, and the optical fiber is transmitted through the optical fiber, can continuously measure the temperature, and is a sensor and a transmission medium; the device is essentially passive equipment, long in measurement distance, safe and reliable and is not afraid of electromagnetic field interference. The principle of distributed optical fiber sensing thermometry is to measure the temperature variation distributed along the optical fiber using Optical Time Domain Reflectometry (OTDR) techniques and Raman (Raman) scattering effects. The laser emits a beam of light, the light enters the temperature sensing optical fiber after being modulated by the optical module, and temperature signals distributed along the optical fiber can be obtained by detecting information of reflected light in the optical fiber. Meanwhile, as the light speed is a constant, the temperature distribution information of the whole sensing optical fiber can be accurately and rapidly obtained by analyzing the time of returning the light beam and combining the high-speed signal acquisition and data processing technology. The optical fiber image transmission beam is combined with the OTDR tester and used for detecting the temperature change of the surface of the object to be detected.
Preferably, the method comprises the steps of coating a rare earth indicator on the surface of an object to be detected under the heat preservation layer in advance, and observing the color change of the indicator through an optical fiber image transmission beam when the CUI needs to be detected, so as to reflect the corrosion condition.
Further preferably, the rare earth indicator can be selected from rare earth metals such as lanthanide series, cerium salt, yttrium salt and the like which can generate color or temperature change when being corroded, and the rare earth indicator is coated on the surface of a pipeline or equipment or a wall body to be detected in a spraying mode, so that the effectiveness of image transmission fiber measurement and observation is improved. The thickness of the sprayed rare earth indication can be 1.1-2 mm.
Preferably, the method comprises measuring the magnitude of the current generated by the potential formed between the different distances of the outer surface of the object to be measured through the preformed hole of the insulating layer. Through bonding the current intensity change on pipeline, wall body or pipeline surface, can carry out diversified careful observation and comprehensive understanding to CUI phenomenon.
Preferably, the method comprises the steps of immersing the heat preservation layer in a pH indicator in advance or sticking pH test paper on the inner wall of the heat preservation layer, and observing the change of the pH test paper through an optical fiber image transmission beam. The heat preservation and insulation materials used today are important calcium silicate, artificial mineral fibers, porous glass, organic foam, ceramic fibers and the like. If left in a wet environment for a long period of time, the halides contained in some insulation materials dissolve. This will result in a decrease in the pH of the retained moisture under the insulation, thereby accelerating the corrosion rate of the steel. Thus, the corrosion condition can be reflected by detecting the pH value change of the heat preservation layer.
According to the method, the surface morphology change and the temperature change of the object to be detected are directly observed through the image transmission of the optical fiber image transmission beam, the color change of the rare earth coating indicator and the PH indicator is observed, the current intensity change of the adhered pipeline, the wall body or the surface of the pipeline can be observed in multiple directions in detail and comprehensively known, and the aim of dynamic monitoring can be achieved through regular detection at intervals.
The invention also provides a device for directly observing the CUI phenomenon through the optical fiber image transmission beam, which comprises an annular shell, wherein an insulating layer is arranged on the inner wall of the annular shell, the optical fiber image transmission beam is arranged in the insulating layer, one end of the optical fiber image transmission beam is connected with an OTDR tester, the other end of the optical fiber image transmission beam is divided into two parts, the first part is in butt joint with the inner wall of the insulating layer, and the butt joint surface of the second part is used as the bottom surface of the optical fiber image transmission beam; the bottom surface of the heat preservation layer is provided with a first conductive metal sheet and a second conductive metal sheet, and the first conductive metal sheet and the second conductive metal sheet are respectively connected with two poles of the same power supply through wires and are connected with current measuring equipment.
The annular shell is tightly attached to the heat insulation layer of the object to be detected, after a certain time, the first phenomenon (such as the shape of the heat insulation layer material, the color change and the pH change) of the inner wall of the heat insulation layer is observed and measured through the optical fiber image transmission beam, the second phenomenon (such as the shape change of the surface of the object to be detected and the color change of the indicator) of the surface of the object to be detected is observed, the current change phenomenon generated by the electric potential between two points (the positions of the first conductive metal sheet 21 and the second conductive metal sheet 22) of the surface of the object to be detected is generated, and the current intensity is related to the corrosion degree of the pipeline surface serving as a circuit. The CUI phenomenon was directly examined by combining the above measured phenomena. When the device is used for observing the CUI phenomenon, holes with corresponding sizes are reserved in the heat preservation layer of an object to be measured in advance, the device is put into the device for measurement when the measurement is needed, the reserved hole area on the heat preservation layer is not large, the heat conduction coefficient is not higher than the hard heat insulation material of the heat preservation layer material in normal times, and the heat preservation effect of the heat preservation layer in the original design is maintained. The tampons were removed at intervals and placed into the device for testing. Through observation and photo of the optical fiber image transmission beam, the pH value change and the current intensity change displayed by the rare earth element PH of the kit are matched, a change curve is drawn, and a corresponding equation is obtained, so that the UI phenomenon of the infusion pipeline and the building envelope can be dynamically observed in the whole process comprehensively and multiply without dismantling an insulating layer. The device can be large or small, can be within 15cm multiplied by 15cm, can be installed simultaneously with a pipeline and a building, and can be installed at various positions of the pipeline and the wall.
Preferably, the heat-insulating layer is a calcium silicate heat-insulating layer or a perlite heat-insulating layer.
Preferably, the annular housing is a foam glass annular housing. The foam glass (or XPS) is 111% waterproof material, can not deform, plays a role in fixing in a device, is also processed into an arc shape, and is overlapped with the curved surface of a pipeline, one or two points of the foam glass can be bonded by adopting an adhesive (such as epoxy resin), but the foam glass does not need to be tightly matched with the pipeline, such as moisture permeated in a pipeline heat insulation layer, and can flow along the lower part of the foam glass to be absorbed by a calcium silicate material.
Preferably, the heat preservation is annular in shape, two semi-rings are spliced, the bottom surface of the lower part of the ring is processed into a curved surface, and the curved surface is identical to the radian of a pipeline to be measured, so that the joint measurement is facilitated.
Preferably, the first conductive metal sheet and the second conductive metal sheet are disposed at opposite positions on the bottom surface of the heat insulating layer.
Preferably, the wires respectively penetrate from the inside of the heat insulation layer and are connected to a power supply.
Preferably, the calcium silicate or perlite in the calcium silicate heat-insulating layer or the perlite heat-insulating layer is impregnated with a pH indicator or pH test paper is stuck on the inner wall of the calcium silicate heat-insulating layer or the perlite heat-insulating layer. Specifically, the two semi-ring heat-insulating layers are soaked in an indicator solution with the pH value less than 7 and then dried, and the pH value showing the pH value of 2-12 can be attached to the inner wall of the ring. Porous calcium silicate or pearlite is a heat insulating material containing more than 95% of micropores, for example, moisture appears on the surface of a shell building enclosure junction, the moisture can slowly rise along the lower part of the shell building enclosure junction due to capillary phenomenon, the rising height can reflect the degree of the moisture, the change of color reflects the degree of chemical and electrochemical reactions of the metal surface and the like (such as the increase of active anions), the metal surface is contacted with the inner surface from the directions and different heights, and the change of color caused by pH value is observed and transmitted.
As a specific embodiment, the optical fiber image transmission bundle may be selected from (1)9 optical fibers are stacked into a 3×3 square; (2) taking 1611 square blocks into image transmission beams with the total 14411 pixels of the matrix of 41×41 and 3×3×41×41, if the diameter of the optical fiber monofilament is 11 μm, the single face of the image transmission beam is 1×41 with the area of 1211 μm (1.2 mm) and about 1.5mm2, and 11 image transmission beams are arranged, and the total area of the fixing material with a larger absorption bag is about 2mm2, and the visible end of the image transmission beam shooting function is enlarged or reduced. For the optical fiber image transmission beam, hexagonal arrangement with higher limit resolution and optical fiber arrangement density can be selected, the optical fiber leather is larger than 1 micron, the optical fiber beam can be divided into two groups, one group is used for temperature detection, and the other group is used for image point array transmission. The image lattice transmission adopts a special-shaped light image transmission beam, the optical fiber surface is aged and changed into a light spot linear array, the light spot linear array is output from the optical fiber linear array end and then is gathered on the pixel linear array of a linear array CCD through an optical adjusting system, and the CCD driving circuit and a subsequent processing system are used for carrying out signal conversion corresponding to the re-running, data storage and processing and image reproduction. The optical fiber image transmission beam is assembled by 6 more image transmission beams, and the method can be realized: 1. directly carrying out the surface phase diagram of the pipeline and transmitting, 2, carrying out the shape-making image of the corrosion state of the rare earth coated on the surface of the pipeline and transmitting, 3, measuring the change of the surface temperature of the pipeline.
The device can determine the following factors according to the placement positions and other tests:
(1) And the construction defect is influenced. The reason why the heat-insulating and heat-dissipating loss of the pipeline seriously exceeds the standard is directly related to the defect from the heat-insulating engineering perspective. Material preservation and construction are not carried out according to the specifications: the thermal insulation materials are stacked at will on site, layered without the thermal insulation thickness according to the regulation, staggered joint, irregular longitudinal joint position, oversized protective layer barrier, water pouring, irregular expansion joint overlapping, no tight joint treatment, cracking caused by too thick silicate composite coating one-time plastering, and the like.
Due to the construction design and the lack of the materials themselves, moisture cannot be prevented from continuously entering the heat insulating layer. The water forms water film on the surface of equipment and pipeline with temperature less than 175 deg.c, and the circulation temperature of infiltration, filming, evaporation and infiltration is alternately formed, so that the partial pressure difference of water vapor is increased. The corrosion risk exists for a long time and is difficult to eliminate.
(2) The upper part of the pipeline is always higher than the bottom temperature, and the upper part of the heat insulation layer (especially soft material) of the pipeline is subjected to rain and snow erosion due to vibration and gravity than the lower part, so that more collapse, deformation and spalling are generated. These two factors lead to a significant increase in heat dissipation losses at the upper part of the pipe.
The problem of protecting a finished product of a heat-insulating structure by adopting soft and semi-hard heat-insulating materials generally occurs that a plurality of pipelines are subjected to cross construction and often generate deformation damage caused by artificial treading and external force action (such as heavy objects such as vehicles passing through the upper part of an underground pipe) on the heat-insulating pipelines in the starting process of petrochemical enterprises.
(3) The waterproof problem of the heat preservation structure in the long-term use process. Sealing agent for sealing joint material due to hydrophobicity of heat insulation material and protective layer
The performance is gradually reduced due to the extension of the service time, and the effects of wind and corrosion lead to the rust breaking, the falling off and the deformation of the protective layer of the self-tapping screw, so that the waterproof performance of the heat-insulating structure is reduced. In rainy days, the heat dissipation loss is obviously increased due to the increase of vaporization heat absorption and heat conduction coefficient after rainwater enters the heat insulation layer. If enterprises are in medium and heavy rain weather, the evaporation capacity of the power boiler is doubled, and the production requirement can be met.
(4) The pipeline has more heat bridges at the positions of the bracket, the elbow, the valve and the like, and the integral heat insulation effect is affected.
(5) The soil contains various soluble salts, wherein the soil contains chlorine ion moisture, and the heat insulating material also contains inorganic salts, chlorides, fluorides and other harmful components. Pipeline and wind speed, wind direction, dew period. Rainfall, temperature, solar radiation, season, biological contamination and pollution.
(6) After the offshore oil and gas pipeline is not subjected to wind limitation and storm carried by typhoons of a certain level, the heat insulation structure can face a plurality of factors such as partial contamination and pollution.
Salt mist and salt rain formed by the ocean atmosphere penetrate into the soft heat insulation material through rainwater and groundwater carriers, and the concentration under the heat insulation layer leads to the increase of the conductivity of the water film. The incomplete heat insulation structure and different coverage degrees of materials can form oxygen concentration corrosion battery, and the increase of the quantity of conductive ions can cause and accelerate corrosion of metal indication.
(7) The insulating material with good closed bubble structure can prevent water vapor from penetrating and help to reduce corrosion risk under the insulating layer, but in the processes of transportation, installation and operation, the pipeline insulating layer cannot be influenced by various factors such as extrusion, collision and deformation, so that some closed bubbles are cracked into through hole moisture and air which enter through gaps, and corrosive ions are concentrated in the pipeline under the action of higher temperature on the pipeline surface (the process temperature range with higher corrosion risk under the C UI insulating layer is-4-175 ℃).
(8) Because the heat insulation material is mostly made of minerals, the heat insulation material contains a large amount of inorganic salts, chlorides, fluorides, sulfides and other harmful components; the other convenient heat insulating material has great specific surface area and abundant capillaries, has certain hygroscopicity and hydroscopicity, and the hydrophobic property of the material subjected to hydrophobic treatment is gradually reduced along with the extension of the service time, so that once the heat insulating layer is incomplete or damaged in structure due to the quality of application or external factors, water vapor and rainwater enter, and a water film is formed on the surface of equipment or a pipeline with the temperature less than 175 ℃.
Harmful components such as inorganic salt, chloride, fluoride and the like leached out of the heat preservation material can cause the conductivity of the water film to be increased; the conductivity of the leaching solution of the heat-insulating material after a period of use is larger than that of the corresponding leaching solution of the new heat-insulating material, the PH value is smaller than that of the new material, the conductivity is what is the content of conductive ions in the solution, and the more the content of the conductive ions is, the more corrosiveness to the surface of the equipment pipeline is.
(9) The ocean atmosphere contains a large amount of chloride, and the chloride can permeate into the heat insulation material by using rainwater as a carrier and is enriched under the heat insulation layer: incomplete insulation structures and different coverage of insulation materials can form oxygen concentration corrosion cells, which can cause and accelerate corrosion of metal surfaces.
(11) Moisture ingress creates a film of water on the surface of the equipment or pipe at temperatures < 175 ℃.
Natural disasters such as war, earthquake, volcanic, and heavy storm snow can cause pipeline damage, and disasters which have been ignored in the past such as space disasters due to solar bursts or severe release of energy stored in the earth space itself (magnetic storm, sub-storm, and ionosphere storm). The induced current generated during a magnetic storm also has a direct effect on the oil and gas pipeline. Cathodic protection is used to maintain negative pressure in the pipeline and surrounding soil, whether buried underground, placed on the sea floor, or in humid air.
The excessive induced voltage and current can exceed the voltage protection range of underground oil, gas and water pipes, so that the underground oil, gas and water pipes lose the function. Measurement shows that when strong magnetic storm happens, induced voltage of 6V exists on an oil pipeline of 1111m, and induced voltage of 6111V exists on a pipeline of 1111 km. The current is passed through the oil pipeline of Mealaska to 1111A. The strong current and high voltage pulse act on the corrosion layer, greatly accelerating the corrosion of the pipeline. Magnetic storm is caused by sun blackness, flare and corona activities, has periodicity and is also a problem of heat insulation and corrosion prevention of pipelines.
The pipeline laid in long distance is inevitably staggered with the ground road and adjacent to the power station, the working voltage of the traffic and transportation systems cannot be completely insulated from the ground, and the stray current of the power supply system which takes the ground as a path is in continuous change, and sometimes has a huge influence on the pipeline like a solar magnetic storm.
When no stray current exists in the underground pipeline, the potential difference of the two poles of the corrosion battery is hundreds of millivolts at most, and when the stray current exists, the potential difference can reach up to 311-511A at most when 8-9V passes through, and the influence of the stray current can reach tens of kilometers. The steel pipe with the wall thickness of 7-8 mm can be corroded and perforated in 4 months under the action of stray current. Of course, the closer the underground pipeline is to the power supply system, the more severe the stray current corrosion is.
CUI phenomenon is a cause of corrosion, damage and life cycle of various pipelines (steam, hot water and oil gas) and building walls. Because the pipeline, the wall surface and the heat insulation structure are in a closed state, moisture permeates through gaps of the structure and erodes (contains reaction with the heat insulation material), and the water is not perceived. In many cases, the serious corrosion causes huge economic loss after accidents such as pipeline breakage, remarkable increase of heat insulation heat, wall collapse, falling off and the like, and even the disaster accident of pipeline perforation explosion due to corrosion is discovered. The device capable of dynamically observing and tracking the UI phenomenon provided by the invention can also optimally design the arrangement of the heat insulation structure according to the selection and construction process of the heat insulation materials under specific conditions, and improve the service life of pipelines and buildings.
Compared with the prior art, the invention has the following beneficial effects:
the method and the device can comprehensively and multiply dynamically observe the corrosion phenomenon under the heat preservation layer in the whole course without dismantling the heat preservation layer. The device provided by the invention can observe different CUI phenomena of the surface of the observation heat-insulating layer and the surface of the object to be measured by utilizing the optical fiber image transmission beam according to the selection and construction process of the heat-insulating material, and when the change of the CUI of the pipeline is found, the emergency reaction can be properly adopted. The method has great significance in improving the building enclosure structure and the CUI prevention of the heating pipeline.
Drawings
Fig. 1 is a schematic diagram of an apparatus for directly observing CU phenomenon through an optical fiber image-transmitting beam according to embodiment 2 of the present invention.
Fig. 2 is a schematic diagram of the device for directly observing the CU1 phenomenon by using an optical fiber image-transmitting beam according to embodiment 2 of the present invention, which is disposed on the surface of an object to be measured to measure the CUI phenomenon.
Fig. 3 is a top view of an apparatus for directly observing CUI phenomenon through an optical fiber image-transmitting beam according to embodiment 2 of the present invention.
Fig. 4 is a top view of an apparatus for directly observing CU phenomenon through an optical fiber image-transmitting beam according to embodiment 2 of the present invention.
Drawing and annotating: the device comprises a 1-annular shell, a 2-heat-insulating layer, a 21-first conductive metal sheet, a 22-second conductive metal sheet, a 3-optical fiber image transmission beam, a 31-OTDR tester, 4-current measuring equipment, 5-objects to be measured and 6-object heat-insulating layer.
Detailed Description
The invention is further illustrated in the following drawings and specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Reagents and materials used in the following examples are commercially available unless otherwise specified.
Example 1
The embodiment provides a method for directly observing a CUI phenomenon through an optical fiber image transmission beam, which is to reserve a hole for the optical fiber image transmission beam to pass through in an insulation layer of an object to be measured, and fill a hard heat insulation material with a heat conduction coefficient not higher than that of the insulation layer material in the hole at the same time, so as to keep the insulation effect of the insulation layer; when the CUI is detected, the optical fiber image transmission beam is used for measuring the shape change of the outer surface of a pipeline or equipment under the heat preservation layer, so that the corrosion condition is reflected, meanwhile, the optical fiber image transmission beam is used for measuring the shape change of a heat preservation material in the heat preservation layer, and then the OTDR equipment or/and the spectrum analysis equipment is used for directly observing and measuring the temperature change of the surface of the object to be measured. In addition, the CUI phenomenon is comprehensively judged by measuring the current generated by electric potentials formed between different distances on the outer surface of a pipeline or equipment and combining the phenomenon observed by using a beam transmission optical fiber. After the detection is finished, the heat insulation material is filled back; the above-described detecting steps are repeated at intervals, so that periodic detection is performed.
Further, rare earth indicators can be coated on the outer surface of a pipeline or equipment under the heat insulation layer in advance, and when the phenomenon needs to be detected, the corrosion condition is measured and observed through an optical fiber image transmission beam. The rare earth indicator can be made of rare earth metals such as lanthanide series, cerium salt, yttrium salt and the like, and is coated on the surfaces of a pipeline or equipment or a wall body to be detected in a spraying mode, so that the effectiveness of image transmission fiber measurement and observation is improved.
Further, the heat preservation layer can be immersed with the pH indicator in advance or the pH test paper is stuck on the inner wall of the heat preservation layer, and the change of the pH test paper is observed through the optical fiber image transmission beam, so that the effectiveness of image transmission fiber measurement and observation is improved.
Example 2
According to the method provided in the above embodiment 1, a device for directly observing CUI phenomenon through an optical fiber image-transmitting beam is designed, as shown in fig. 1, specifically including an annular housing 1, an insulation layer 2 is disposed on an inner wall of the annular housing 1, an optical fiber image-transmitting beam 3 is disposed inside the insulation layer 2, one end of the optical fiber image-transmitting beam 3 is connected with an OTDR tester 31, the other end is divided into two parts, a first part is butted with an inner wall of the insulation layer 2, and a butted surface of the second part is used as a bottom surface of the optical fiber image-transmitting beam 3; the bottom surface of the heat preservation is provided with a first conductive metal sheet 21 and a second conductive metal sheet 22, the first conductive metal sheet 21 and the second conductive metal sheet 22 are respectively connected with two poles of the same power supply through wires, the wires respectively penetrate out of the heat preservation 2 and are connected to a power supply, and the wires are connected with current measuring equipment 4.
The device provided above, heat preservation 2 is calcium silicate heat preservation, annular shell 1 is foam glass annular shell, first electrically conductive sheetmetal 21 and second electrically conductive sheetmetal 2 set up the relative position on the bottom surface of heat preservation 2, calcium silicate heat preservation has the acid-base indication effect, and its specific implementation is that silicate has soaked the indicator or has the pH test paper at the inner wall of calcium silicate heat preservation.
As shown in fig. 2, the apparatus provided in this embodiment is disposed on the surface of the object to be measured 5 to measure CUI phenomenon, wherein the annular housing 1 is tightly attached to the heat insulation layer 6 of the object to be measured, and after a certain period of time, the first phenomenon (such as morphology of the heat insulation layer material, color change, and pH change) of the inner wall of the heat insulation layer 2 is observed and measured, and the second phenomenon (such as morphology change of the object to be measured, and color change of the indicator) of the surface of the object to be measured 5 is observed, and the current change phenomenon is generated by the electric potential between two points (positions of the first conductive metal sheet 21 and the second conductive metal sheet 22) of the surface of the object to be measured 5, wherein the current intensity is related to the corrosion degree of the surface of the pipeline as a circuit. The CUI phenomenon was directly examined by combining the above measured phenomena.
Example 3
Fig. 3 and fig. 4 show top views of the device provided in embodiment 2, and it can be seen that the whole device may be cylindrical, the outer layer is an annular housing 1, an insulation layer 2 is disposed on the inner wall of the annular housing 1, and an optical fiber image transmission bundle 3 is disposed inside the insulation layer 2, where the optical fiber image transmission bundle 3 may be integrated into a bundle (as shown in fig. 3) or may be split (as shown in fig. 4). The device provided by the embodiment can select different positions of the pipeline and the wall body for measurement, so that weak links of CUI phenomenon of heat insulation engineering can be found conveniently. The device provided by the embodiment is beneficial to tracing the source, and finding out the cause and the prevention measures of the CUI phenomenon of the pipeline or the building wall. Such as where the stray current suddenly increases and preventing corrosion from being exacerbated.
When the device is used for observing the CUI phenomenon, the device is put into the device to measure when the device needs to measure in advance at the reserved hole of the heat-insulating layer of the object to be measured, the reserved hole area on the heat-insulating layer is not large, the heat-conducting coefficient is not higher than the hard heat-insulating material of the heat-insulating layer material in normal times, and the heat-insulating effect of the heat-insulating layer in the original design is maintained. The tampons were removed at intervals and placed into the device for testing. Through observation and photo of the optical fiber image transmission beam, the pH value change and the current intensity change displayed by the rare earth element pH of the kit are matched, a change curve is drawn, a corresponding equation is obtained, the CUI phenomenon of the structures such as the fluid conveying pipeline, the building enclosure and the like can be comprehensively, dynamically and multi-directionally detected, and the CUI phenomenon can be newly understood. The device of the invention can also be linked with a related control mechanism. The change of the pipe CUI was found and an emergency response was immediately taken. The method has great significance in improving the building enclosure structure and the CUI prevention of the heating pipeline.
Claims (10)
1. A method for directly observing corrosion phenomenon under an insulating layer through an optical fiber image transmission beam is characterized in that a hole for the optical fiber image transmission beam to pass through is reserved in the insulating layer of an object to be detected, a hard heat insulation material with a heat conduction coefficient not higher than that of the insulating layer material is filled in the hole at the same time, and the insulating effect of the insulating layer is maintained; when detecting the CUI, the stuffed heat insulation material is taken out, the optical fiber image transmission beam is utilized to pass through the heat insulation layer to directly observe the appearance change of the outer surface of the object to be detected under the heat insulation layer, meanwhile, the optical fiber image transmission beam is utilized to observe the appearance change of the heat insulation material in the heat insulation layer, the optical fiber image transmission beam and the OTDR tester are utilized to measure the temperature change of the surface of the object to be detected, and after the detection is finished, the heat insulation material is stuffed.
2. The method of claim 1, including pre-coating a rare earth indicator on the surface of the object under the insulating layer, and observing the color change of the indicator through an optical fiber image-transmitting beam when the CUI needs to be detected, thereby reflecting the corrosion condition.
3. The method of claim 1, comprising measuring the magnitude of the current generated by the potential developed between the different distances of the outer surface of the test object through the preformed hole of the insulating layer.
4. The device for directly observing the CUI phenomenon through the optical fiber image transmission beam is characterized by comprising an annular shell (1), wherein an insulation layer (2) is arranged on the inner wall of the annular shell, an optical fiber image transmission beam (3) is arranged in the insulation layer (2), one end of the optical fiber image transmission beam (3) is connected with an OTDR tester (31), the other end of the optical fiber image transmission beam is divided into two parts, a first part is in butt joint with the inner wall of the insulation layer (2), and the butt joint surface of the second part is used as the bottom surface of the optical fiber image transmission beam (3); the bottom surface of the heat preservation layer (2) is provided with a first conductive metal sheet (21) and a second conductive metal sheet (22), and the first conductive metal sheet (21) and the second conductive metal sheet (22) are respectively connected with two poles of the same power supply through wires and are connected with current measuring equipment (4).
5. The device according to claim 4, characterized in that the insulation layer (2) is a calcium silicate insulation layer or a perlite insulation layer.
6. The device according to claim 4, characterized in that the annular housing (1) is a foam glass annular housing.
7. The device according to claim 5, wherein the heat-insulating layer (2) is annular in shape, and is formed by splicing two semi-rings, and the bottom surface of the lower part of the ring is processed into a curved surface which is the same as the radian of the pipeline to be tested.
8. The device according to claim 4, characterized in that the first conductive metal sheet (21) and the second conductive metal sheet (22) are arranged in opposite positions on the bottom surface of the insulating layer (2).
9. The device according to claim 4, characterized in that the wires extend from the inside of the insulating layer (2) and are connected to a power source, respectively.
10. The device according to claim 5, wherein the calcium silicate or perlite in the calcium silicate or perlite insulation is impregnated with a pH indicator or a pH indicator paper is attached to the inner wall of the calcium silicate or perlite insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310076008.5A CN116297532A (en) | 2023-01-17 | 2023-01-17 | Method and device for directly observing corrosion phenomenon under heat preservation layer through optical fiber image transmission beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310076008.5A CN116297532A (en) | 2023-01-17 | 2023-01-17 | Method and device for directly observing corrosion phenomenon under heat preservation layer through optical fiber image transmission beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116297532A true CN116297532A (en) | 2023-06-23 |
Family
ID=86827765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310076008.5A Pending CN116297532A (en) | 2023-01-17 | 2023-01-17 | Method and device for directly observing corrosion phenomenon under heat preservation layer through optical fiber image transmission beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116297532A (en) |
-
2023
- 2023-01-17 CN CN202310076008.5A patent/CN116297532A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109140250B (en) | Gas-liquid transport pipeline leakage point on-line monitoring system based on distributed optical fiber sensing | |
| Fujino et al. | Monitoring system of the Akashi Kaikyo Bridge and displacement measurement using GPS | |
| US20130037420A1 (en) | Method and apparatus for detecting moisture on metal and other surfaces, including surfaces under thermal insulation | |
| CN108298216A (en) | The monitoring system and method for oil storage tank leakage | |
| Sun et al. | Quasi-distributed fiber-optic in-situ monitoring technology for large-scale measurement of soil water content and its application | |
| CN213065588U (en) | Pipeline leakage detection system | |
| Rouwet et al. | Geochemical monitoring of volcanic lakes. A generalized box model for active crater lakes | |
| CN112554120A (en) | Bridge deck automatic snow melting and ice melting system and method based on terrestrial heat | |
| Li et al. | Detecting pipeline leakage using active distributed temperature Sensing: Theoretical modeling and experimental verification | |
| CN116297532A (en) | Method and device for directly observing corrosion phenomenon under heat preservation layer through optical fiber image transmission beam | |
| CN114635754A (en) | Rock burst/rockburst risk early warning evaluation method based on temperature gradient | |
| CN106764454B (en) | Distributed optical fiber ribbon and distributed optical fiber sensing pipe network monitoring device | |
| CN208199440U (en) | The monitoring system of oil storage tank leakage | |
| DE19509129A1 (en) | Method and device for checking and monitoring the condition of pipes, containers, pipelines or the like | |
| CN109889600A (en) | A kind of groundwater in arid region matter monitoring device | |
| WO1996026425A1 (en) | Method and device for checking and monitoring the state of tubes, containers, pipelines or the like | |
| WO2000045148A1 (en) | Corrosion sensors contained within the thermally insulating member of a metal pipe | |
| CN107422439A (en) | A kind of underground pipe gallery monitors optical cable | |
| WO2023217367A1 (en) | Method for early corrosion detection under insulation | |
| JP2612812B2 (en) | Measurement system for moisture behavior / migration in stratum and method of exploration thereof | |
| CN205618902U (en) | Prefabricated direct -burried insulating tube with energy -conserving monitor function | |
| CN215174215U (en) | Automatic positioning device for leakage of water supply pipe network | |
| CN114005558B (en) | FBG real-time leakage monitoring method and system for main steam pipeline of nuclear power station | |
| CN211780246U (en) | Urban rain sewage pipeline leakage monitoring device | |
| CN207421795U (en) | Distribution type fiber-optic band and distributing optical fiber sensing pipe network monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |