CN109799254A - A kind of band water transport battalion tunnel pipelines connect steel member service life prediction technique - Google Patents
A kind of band water transport battalion tunnel pipelines connect steel member service life prediction technique Download PDFInfo
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- CN109799254A CN109799254A CN201910048522.1A CN201910048522A CN109799254A CN 109799254 A CN109799254 A CN 109799254A CN 201910048522 A CN201910048522 A CN 201910048522A CN 109799254 A CN109799254 A CN 109799254A
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Abstract
The invention discloses a kind of band water transport battalion tunnel pipelines to connect steel member service life prediction technique, method includes the following steps: determining fundamental test condition, including collection in worksite water sample and carries out water sample analysis and obtains the design parameter of steel structure connector；It formulates testing program and builds the test platform for meeting field pipes operation of engineering projects temperature and structural stress state；Prepare test material, including production several groups forecast sample and configuration testing liquid；Several groups forecast sample is placed in testing liquid and carries out corrosion experiment, the different test periods is arranged in every group of forecast sample, if obtaining dry corrosion sample；If life forecast method pair dry corrosion sample carries out Lifetime Forecasting Test respectively；The service life of pipeline connection steel member is predicted according to test result.The invention has the benefit that design Years Of Service can be proposed relatively accurately, engineering design, construction, operation and maintenance are scientifically instructed, reduces operation maintenance cost, improves pipeline operation security reliability.
Description
Technical field
The present invention relates to tunnel pipelines maintenance technology fields, in particular to a kind of tunnel pipelines connection of band water transport battalion
Steel member service life prediction technique.
Background technique
In tunnel under the conditions of water-filled environment, the steel supports of pipeline and connector it is corrosion-damaged inevitable, and just
Step forms some design and select materials and protection is known together；Wherein, " pipe-line crossing project design specification " GB50423-
2013 regulations:
1, the gallery of mountain tunnel, inclined gallery interior conduit preferably use the aerial laying of buttress or earthing laying；Waters tunnel inner tube
Road preferably uses the aerial laying of buttress；
2, waters tunnel should carry out anti-floating accounting to inner pipe, and should take underwater pipeline stabilizing measure；
3, common iron and stainless steel can be selected in the construction material of buttress built on stilts installation pipeline in tunnel；When selection ordinary steel
When material, its surface of all steel members should all use erosion resistant coating or the setting anode loss protection measure of environmental corrosion resisting；Pipeline connects
Fitting should use same metal material.It preferably avoids being difficult to check in component design, the dead angle cleaned with water and groove；
4, the suitable water-filling operation in waters tunnel；Land tunnel portal is preferably designed according to closing operation.
But there is no the water body medium for concrete engineering, operation pipe temperature, structural stress, steel connections for these regulations
The corresponding technical requirements of the conditions propositions such as part selection and safeguard structure, do not form the prediction technique of a set of service life yet, because
Its clear service life and designer also has no way of.To guarantee Tunnel Passing pipeline operation security, practices well is according to " oil at present
The aerial part in letter shoot road and its affiliated facility maintenance regulation " SY/T6068 requirement, tunnel structure, pipeline and connection
Steel member carries out regular structure detection, find the problem processing in time, replacement.Usually 5-8 checks primary, progress state of the art
Carry out maintenance, maintenance or maintenance work after assessment.
With greatly developing for oil-gas pipeline engineering construction, tunnel Chuan Jiang (river) engineering is more and more.Such as according to " oil gas is defeated
Send the aerial part of pipeline and its affiliated facility maintenance regulation " the requirement frequency of SY/T6068 carries out and checks and maintenance, tunnel
Management cost is transported in the larger raisings of meeting such as quantity is more, inspection cycle is long, assessment and maintenance activity are costly；But as not in time check with
Maintenance, once connector corrosion failure, may cause the consequence of pipeline gas engineering and bringing on a disaster property.Therefore, prior art condition
Under, design and the state of the art that prior accurate grasp tunnel interior conduit and connecting elements are difficult to when operation maintenance are put into biggish
Strength not only increases operation cost, also brings to pipeline operation for inspection, assessment and maintenance (replacement) during runing
Security risk.
Summary of the invention
To solve the above problems, specific water in tunnel when can be runed according to pipeline the purpose of the present invention is to provide one kind
The conditions such as matter, pipeline operation temperature carry out it and are on active service the longevity for the design condition of pipeline connection steel member material and safeguard procedures
Life prediction can relatively accurately propose design life, or the service life proposed according to owner requires to be reversed
Structure design, scientifically instructs engineering design, construction, operation and maintenance, reduces operation maintenance cost, improves pipeline operation security
Reliability.
The present invention provides a kind of band water transport battalion tunnel pipelines to connect steel member service life prediction technique, and this method includes
Following steps:
Step 101: determining fundamental test condition, including collection in worksite water sample and carry out water sample analysis and connected with steel structure is obtained
The design parameter of part；
Step 102: formulating testing program and build the examination for meeting field pipes operation of engineering projects temperature and structural stress state
Test platform；
Step 103: preparing test material, including production several groups forecast sample and configuration testing liquid；
Step 104: several groups forecast sample being placed in testing liquid and carries out corrosion test, every group of forecast sample setting is not
The same test period, if obtaining dry corrosion sample；
Step 104: if life forecast method pair dry corrosion sample carries out Lifetime Forecasting Test respectively；
Step 105: the service life of pipeline connection steel member is predicted according to test result.
Improved as of the invention further, in step 101, the water sample analysis include determine mineralogical composition, content and
Water body pH value.
Improved as of the invention further, in step 103, forecast sample include junction steel plate, steel structure connector and
The safeguard structure assembly being made of the two.
It is further improved as of the invention, in step 104, every group of test at least three forecast sample.
It is further improved as of the invention, in step 103, testing liquid configures simulated solution, mould according to engineering specifications
Ion concentration, mineralogical composition, conductivity, pH value and the temperature of quasi- solution should meet live water quality and operation temperature requirement.
It is further improved as of the invention, in step 105, the life-span prediction method includes homogeneous corrosion life prediction
It is predicted with local corrosion life.
Improved as of the invention further, the homogeneous corrosion life prediction by successively carry out surface analysis test,
The service life of electro-chemical test and mass change experiment forecast sample.
As further improvement of the invention, the local corrosion life prediction passes through laser confocal microscope and analyzes corruption
The corrosion pit depth of sample is lost, point corrosion pit depth distribution is based on, using the service life of the pre- sample of Gumbel extreme value analysis method.
As further improvement of the invention, the surface analysis test is equipped with X using field emission scanning electron microscope
Ray analysis energy disperse spectroscopy is used to characterize sample surfaces etch state.
As further improvement of the invention, the electro-chemical test uses three-electrode system in-situ test.
The invention has the benefit that by being directed to tunnel interior conduit operating environment, in conjunction with pipe line steel structure stud connector design
Condition, construction test platform carry out the corrosion-damaged simulation test of junction steel plate, steel structure connector monomer, to steel structure connector
Carry out corrosion-damaged test with safeguard structure assembly, summarizes junction steel plate, connecting elements and combinations thereof protective structure
Failure regularity, it is comprehensive in many ways to determine the service life for designing steel structure connector and protection system, it can be relatively accurately
It is proposed design Years Of Service, or the service life proposed according to owner requires to be reversed structure design, scientifically instructs work
Journey design, construction, operation and maintenance, reduce operation maintenance cost, improve pipeline operation security reliability.
Detailed description of the invention
Fig. 1 is that a kind of band water transport battalion tunnel pipelines described in the embodiment of the present invention connect steel member service life prediction technique
Flow chart；
Fig. 2 is that a kind of band water transport battalion tunnel pipelines described in the embodiment of the present invention connect steel member service life prediction technique
Corrosion carbon steel sample XRD energy spectrum diagram；
Fig. 3 is that a kind of band water transport battalion tunnel pipelines described in the embodiment of the present invention connect steel member service life prediction technique
Corrosion carbon steel sample Raman spectrum analysis result figure；
Fig. 4 is that a kind of band water transport battalion tunnel pipelines described in the embodiment of the present invention connect steel member service life prediction technique
Corrosion of carbon steel sample ac impedance spectroscopy；
Fig. 5 is that a kind of band water transport battalion tunnel pipelines described in the embodiment of the present invention connect steel member service life prediction technique
Corrosion of carbon steel sample corrosion potential, polarization curve；
Fig. 6 is that a kind of band water transport battalion tunnel pipelines described in the embodiment of the present invention connect steel member service life prediction technique
3 months bolt surface corrosion pit depth linear regression fit results；
Fig. 7 is that a kind of band water transport battalion tunnel pipelines described in the embodiment of the present invention connect steel member service life prediction technique
6 months bolt surface corrosion pit depth linear regression fit results；
Fig. 8 is that a kind of band water transport battalion tunnel pipelines described in the embodiment of the present invention connect steel member service life prediction technique
9 months bolt surface corrosion pit depth linear regression fit results；
Fig. 9 is that a kind of band water transport battalion tunnel pipelines described in the embodiment of the present invention connect steel member service life prediction technique
3,6,9 month abrasion cycles under maximum point corrosion pit depth (d on boltm) (t) variation relation and matched curve at any time.
Specific embodiment
The present invention is described in further detail below by specific embodiment and in conjunction with attached drawing.
As shown in Figure 1, a kind of band water transport battalion tunnel pipelines connection steel member service life described in the embodiment of the present invention is pre-
Survey method, method includes the following steps:
Step 101: determining fundamental test condition, including collection in worksite water sample and carry out water sample analysis and connected with steel structure is obtained
The design parameter of part；
Step 102: formulating testing program and build the examination for meeting field pipes operation of engineering projects temperature and structural stress state
Test platform；
Step 103: preparing test material, including production several groups forecast sample and configuration testing liquid；
Step 104: several groups forecast sample being placed in testing liquid and carries out corrosion test, every group of forecast sample setting is not
The same test period, if obtaining dry corrosion sample；
Step 105: if life forecast method pair dry corrosion sample carries out Lifetime Forecasting Test respectively；
Step 106: the service life of pipeline connection steel member is predicted according to test result.
Collection in worksite water sample simultaneously carries out water sample analysis, obtains the design parameter of steel structure connector；Validation test relevant parameter
With other related requests；Prepare data according to pre-stage test, formulates research method, determine testing program；And it builds and meets scene
The test platform of temperature, structural stress state is runed in pipeline engineering, purchases corresponding test material, configures testing liquid.
Further, in step 101, water sample analysis includes determining mineralogical composition, content and water body pH value.
Further, in step 103, forecast sample includes junction steel plate, steel structure connector and is made of the two anti-
Protection structure assembly.
Further, in step 104, every group of test at least three forecast sample, sample size is more, and result is more accurate.
Further, in step 103, testing liquid configures simulated solution according to engineering specifications, and the ion of simulated solution is dense
Degree, mineralogical composition, conductivity, pH value and temperature should meet live water quality and operation temperature requirement.
Further, in step 105, life-span prediction method includes that homogeneous corrosion life prediction and local corrosion life are pre-
It surveys.It is respectively suitable for junction steel plate, homogeneous corrosion or local corrosion feelings occur for steel structure connector (bolt, nut, washer etc.)
Condition.
Further, homogeneous corrosion life prediction is by successively carrying out surface analysis test, electro-chemical test and quality
The service life of variation experiment forecast sample.
Homogeneous corrosion life prediction: under the premise of meeting temperature condition for junction steel plate, steel structure connector (bolt,
Nut, washer etc.) sample carry out 1 day, 5 days, 10 days and 15 days (can extend if necessary) corrosion experiment.Then to corrosion
Sample is successively tested as follows: surface analysis test, electro-chemical test and mass change (weight-loss method), every group of test is at least
3 samples can suitably lengthen the connectors such as bolt depending on the protection condition test period, so that the basic of pre- sample uses the longevity
Life.
Because life-span prediction method described herein is suitable for homogeneous corrosion, need to combine three kinds of surface analysis hands
Section, the corrosion type of comprehensive descision sample, to ensure the validity of life-span prediction method.
(1) surface analysis is tested
X-ray analysis energy disperse spectroscopy, which is equipped with, by field emission scanning electron microscope (SEM) is used to characterize sample surfaces corrosion
Form.When measurement, operating voltage 25kV.Cu target, tube voltage 40kV can be used in X-ray diffraction (XRD) instrument, and tube current is
40mA, 5 °/min of sweep speed.The laser that wavelength is 514nm can be used in Raman spectrometer, and laser power 9mW scans model
Enclose 100-2000cm-1, spectral resolution 1cm-1, single spectrum time of integration 40s.
(2) electro-chemical test
Corrosion sample surfaces etch state is analyzed by electro-chemical test.Test the electrochemical workstation needed, Ying Keshi
Existing AC impedance, semiconductor electrochemistry and the test of a variety of Conventional electrochemicals.Electro-chemical test uses three-electrode system in-situ test,
Being saturated KCl calomel electrode (SCE) is reference electrode, and platinum filament is auxiliary electrode, is correspondingly connected with steel plate, steel structure connector (bolt, spiral shell
Cap, washer etc.) electrode is prepared as working electrode.Wherein electrolyte solution is simulation fresh water solution, measures monometallic open respectively
Road current potential (OCP), polarization curve (Tafel) and impedance (EIS), thus obtain sample corrosion current density and electrode it is anti-
Answer resistance.
The formula for calculating corrosion rate by corrosion electric current density is as follows:
icorr×M×87600/n/F/ρ
Wherein, icorrFor corrosion electric current density, M is metal molar quality, and n is transfer electron number, and F is Faraday constant
(26.8Ah), ρ are density metal.
The time of measuring of corrosion potential is 30min, and the vibration of ambient enviroment is minimized in measurement process, keeps system
Stablize.Polarization curve measurement sets potential test range as the+120mv relative to open circuit potential, sweep speed 0.5mv/s.It is comprehensive
Corrosion current density variation tendency obtained in corrosion potential and polarization curve is closed, to analyze the speed of sample surfaces corrosion
Degree.It can be with the measurement frequency range of impedance for 10-2-104Hz disturbs as 10mV.By the fitting of impedance spectrum, available electrode
Reaction resistance, thus the ion barrier ability energy of judgement sample surface corrosion Product Films.
(3) mass change (weight-loss method):
By junction steel plate, steel structure connector (bolt, nut, washer etc.) is cleaned, dry up, simulation fresh water is immersed after weighing
In solution, temperature setting water bath with thermostatic control is runed according to pipeline.It is taken out after impregnating 1d, 5d, 10d and 15d respectively, every group three parallel
Sample.Sample is subjected to pickling (pickling solution is 10%HCl and 5% hexamethylenetetramine mixed solution) weighing record data afterwards,
To calculate sample remaining life with weight-loss method, formula is as follows:
T=0.85W/365W1
Wherein, 0.85 is design factor, and W is original net quality, W1Refer to 365 days of 1 year for mass change amount, 365.
Further, local corrosion life prediction pipeline junction steel plate and connector combines (can reduce in proportion) postposition
The water bath with thermostatic control in simulated experiment water, test period are respectively 3,6,9 months or are determined according to specific testing program, every group of examination
At least three sample is tested, the test period optionally can suitably lengthen.The longevity is used by pre- samples such as Gumbel extreme value analysis methods
Life.
After experiment, the corrosion pit depth of corrosion sample is analyzed by laser confocal microscope.This experiment can be 20
Surface topography after times object microscopic observation sample etches simultaneously measures point corrosion pit depth, is based on point corrosion pit depth distribution, uses
The basic service life of Gumbel extreme value analysis method prediction assembly.
The specific method is as follows for assembly experiment predicting residual useful life for Gumbel extreme value analysis method.The maximum of local corrosion
Corrosion pit depth obeys maximum extreme value Gumbel distribution function.
Wherein, A is regression straight line intercept, and B is regression straight line slope, and D is stochastic variable, and P is the probability of stochastic variable, dm
For maximum point corrosion pit depth.
Cumulative Distribution Function is as follows:
Wherein, N is maximum corrosion pit depth number, and i is sequence number (arranging from small to large), xiFor corrosion pit depth value.
The d acquired at this time is found out according to linear fit resultm.Under different soaking times, connector (bolt, nut, pad
Circle etc.) on maximum pit depth (dm) at any time the relationship of (t) meet parabola rule:
dm=a+btc
Wherein a, b are parabola constant, and c is power function constant.According to the experimental result of pitting penetration and combine its correspondence
Number of days, Function Fitting is carried out to the functional relation of point corrosion pit depth and etching time, obtains the functional value of a, b, c in equation,
The point corrosion pit depth curve under the simulated environment can be obtained, and according to the service life of the pre- sample of kinetic curve.
Further, for junction steel plate, bimetry is by subject to homogeneous corrosion bimetry；For connector etc.,
The homogeneous corrosion model prediction service life is then used when homogeneous corrosion occurs for its surface, and then uses local corrosion when local corrosion occurs
(spot corrosion) model prediction service life.
When specifically used, for by carbon steel, corrosion life is predicted in fresh water:
Fundamental test condition: Q235A junction steel plate, the M6 carbon steel of 10mm turns blue bolt (5.8 grades), the height of bolt teeth
Dm=542 μm.
Configuration fresh water solution is Cl-For 24ppm, SO4 2-For 6l ppm, HCO3 -For 51ppm, Na+For 63ppm, fresh water is simulated
Conductivity be 260 μ s/cm, pH value 7.75,20 DEG C of test temperature.
(1) homogeneous corrosion life prediction (by taking junction steel plate as an example)
After the test observation time is respectively 1d, 5d, 10d and 15d.
(a) surface analysis is tested
Fig. 2, Fig. 3 show carbon steel surface under fresh water environment based on homogeneous corrosion, main corrosion product be FeOOH and
Fe3O4, such corrosion product is therefore poor to parent metal protective action in metal surface poor adhesive force, with abrasion cycle
Extending corrosion will continue to accelerate.
(b) electro-chemical test
The formula for calculating corrosion rate by corrosion electric current density is as follows:
icorr×M×87600/n/F/ρ
Wherein, icorrFor corrosion electric current density, M is metal molar quality, and n is transfer electron number, and F is Faraday constant
(26.8Ah), ρ are density metal.
According to above-mentioned formula, corrosion rate will be converted to such as according to the corrosion current density that polarization curve obtains in Fig. 5
Shown in table 1, in available experimental period, sample surfaces occur corrosion rate and are continuously increased.
Table 1
| Etching time (day) | Corrosion current density (μ A/cm2) | Corrosion rate (mm/y) |
| 1 | 96.3829 | 0.11309 |
| 2 | 84.68373 | 0.09936 |
| 3 | 78.88601 | 0.09256 |
| 4 | 43.39103 | 0.05091 |
| 5 | 121.39478 | 0.14244 |
| 6 | 394.00343 | 0.46231 |
| 7 | 49.75079 | 0.05838 |
| 8 | 1548.81662 | 0.64396 |
| 9 | 225.26826 | 0.26432 |
| 10 | 436.81747 | 0.51255 |
| 11 | 362.82734 | 0.42573 |
| 12 | 342.92567 | 0.40238 |
| 13 | 2115.43653 | 0.13545 |
| 14 | 509.33087 | 0.59763 |
| 15 | 2843.15149 | 0.98932 |
The Electrochemical results of corrosion of carbon steel sample are as shown in Figure 3 and Figure 4.It is available by the fitting of impedance spectrum
Electrode reaction resistance, thus the ion barrier ability energy of judgement sample surface corrosion Product Films.In studied abrasion cycle, carbon steel
Surface corrosion product film resistance obviously constantly declines, and metal anode dissolves driving force and increases, therefore fitting result shows the environment
Lower corrosion accelerates, and belongs to homogeneous corrosion.
(c) quality is weightless
Its remaining life is calculated, specifically with monomer experimental lifetime predictor formula by mass change before and after sample etches
Parameter is shown in Table 2.The remaining life of estimation carbon steel sample in water is 28.15 accordingly.
Table 2
(2) local corrosion (spot corrosion) occurs, life prediction is exemplified below:
Sample remaining life is estimated using Gumbel extreme value analysis method.It is carried out in simulated seawater 3,6,9 months by a definite date
Acceleration study.Depth is cheated by 5 Typical corrosions that laser confocal microscope obtains each corrosion sample.By corrosion pit depth
It is as follows to bring Cumulative Distribution Function into, acquires P value:
Wherein, N is maximum corrosion pit depth number, and i is sequence number (arranging from small to large), xiFor corrosion pit depth value.
Bring P value into formula Ln (Ln (1/P)) and evaluation.By the corrosion pit depth of bolt, P value and Ln (Ln (1/P))
Ordered series of numbers is shown in the table 3.
Table 3
| Serial number (i) | 3mdm(um) | 6mdm(um) | 9mdm(um) | P(D<dm) | 1/P | Ln(Ln(1/P)) |
| 1 | 25.418 | 34.661 | 50.272 | 0.1667 | 6 | 0.5832 |
| 2 | 27.009 | 45.104 | 51.205 | 0.3333 | 3 | 0.0940 |
| 3 | 30.461 | 45.469 | 55.644 | 0.5 | 2 | -0.3665 |
| 4 | 31.153 | 47.225 | 64.098 | 0.6667 | 1.5 | -0.9027 |
| 5 | 32.566 | 48.713 | 64.206 | 0.8333 | 1.2 | -1.7020 |
Using the corrosion pit depth under 3,6, September abrasion cycle as abscissa, corresponding Ln (Ln (1/P)) is ordinate, is done
Each abrasion cycle Regression straight line out, is shown in Fig. 6, Fig. 7 and Fig. 8.To obtain the regression straight line intercept under each abrasion cycle
And slope:
At 3 months: Ln (Ln (1/P))=- 0.282dm+7.8111
At 6 months: Ln (Ln (1/P))=- 0.1324dm+5.3978
At 9 months: Ln (Ln (1/P))=- 0.1227dm+6.5454
As P=0.99, abrasion cycle is respectively that 3,6,9 months maximum point corrosion pit depth can be asked by following three equations
Out:
- 4.6=-0.282dm+7.8111, dm=44.0110um
- 4.6=-0.1324dm+5.3978, dm=75.5121um
- 4.6=-0.1227dm+6.5454, dm=90.8346um
Under different abrasion cycles, maximum point corrosion pit depth (d on boltm) at any time the relationship of (t) meet parabola rule:
dm=a+btc.Using point corrosion pit depth maximum under each period as ordinate, abrasion cycle is abscissa mapping, sees Fig. 9.
Further progress fitting, obtains fitting result dm=18.1290t0.7169。
To obtain the i.e. d when maximum point corrosion pit depth is the height of selected bolt teethm=542um, remaining life t
=114.3770m, i.e., 9.5314 years.
Thus method can be found out, and such as taking bolt projected life is 16 years, then needing to choose screw pitch is 1.814 millimeters, tooth
High 0.985 millimeter or more of bolt.
Based on connection steel member whole system generation homogeneous corrosion, then calculated according to homogeneous corrosion life-span prediction method,
Take gained longest-lived value；It is based on connection steel member whole system generation local corrosion, then pre- according to the local corrosion service life
Survey method calculates, that is, takes gained service life most short value；When connection steel member whole system is mixed corrosion, then according to local corrosion
Life-span prediction method calculates, that is, takes gained service life most short value.
It is described to be merely a preferred embodiment of the present invention, it is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of band water transport battalion tunnel pipelines connect steel member service life prediction technique, which is characterized in that this method include with
Lower step:
Step 101: determining fundamental test condition, including collection in worksite water sample and carry out water sample analysis and obtain steel structure connector
Design parameter；
Step 102: formulate testing program and building meet field pipes operation of engineering projects temperature and structural stress state test it is flat
Platform；
Step 103: preparing test material, including production several groups forecast sample and configuration testing liquid；
Step 104: several groups forecast sample being placed in testing liquid and carries out corrosion test, every group of forecast sample is arranged different
Test period, if obtaining dry corrosion sample；
Step 105: if life forecast method pair dry corrosion sample carries out Lifetime Forecasting Test respectively；
Step 106: the service life of pipeline connection steel member is predicted according to test result.
2. a kind of band water transport battalion tunnel pipelines according to claim 1 connect steel member service life prediction technique, special
Sign is, in step 101, the water sample analysis includes determining mineralogical composition, content and water body pH value.
3. a kind of band water transport battalion tunnel pipelines according to claim 1 connect steel member service life prediction technique, special
Sign is, in step 103, forecast sample includes junction steel plate, steel structure connector and combined by the safeguard structure that the two forms
Body.
4. a kind of band water transport battalion tunnel pipelines according to claim 1 connect steel member service life prediction technique, special
Sign is, in step 104, every group of test at least three forecast sample.
5. a kind of band water transport battalion tunnel pipelines according to claim 1 connect steel member service life prediction technique, special
Sign is, in step 103, testing liquid configures simulated solution according to engineering specifications, the ion concentration of simulated solution, mineral at
Divide, conductivity, pH value and temperature should meet live water quality and operation temperature requirement.
6. a kind of band water transport battalion tunnel pipelines according to claim 1 connect steel member service life prediction technique, special
Sign is, in step 105, the life-span prediction method includes homogeneous corrosion life prediction and local corrosion life prediction.
7. a kind of band water transport battalion tunnel pipelines according to claim 6 connect steel member service life prediction technique, special
Sign is that the homogeneous corrosion life prediction is real by successively carrying out surface analysis test, electro-chemical test and mass change
Test the service life of forecast sample.
8. a kind of band water transport battalion tunnel pipelines according to claim 6 connect steel member service life prediction technique, special
Sign is that the corrosion pit depth of corrosion sample is analyzed in the local corrosion life prediction by laser confocal microscope, is based on
Point corrosion pit depth distribution, using the service life of the pre- sample of Gumbel extreme value analysis method.
9. a kind of band water transport battalion tunnel pipelines according to claim 7 connect steel member service life prediction technique, special
Sign is that the surface analysis test is equipped with X-ray analysis energy disperse spectroscopy using field emission scanning electron microscope and is used to characterize sample
Product surface corrosion form.
10. a kind of band water transport battalion tunnel pipelines according to claim 7 connect steel member service life prediction technique, special
Sign is that the electro-chemical test uses three-electrode system in-situ test.
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| CN111159798A (en) * | 2019-12-06 | 2020-05-15 | 中国能源建设集团浙江省电力设计院有限公司 | Oil-gas pipeline water area pipe jacking tunnel crossing engineering design method based on water filling operation |
| CN113011638A (en) * | 2021-03-01 | 2021-06-22 | 中车大连机车研究所有限公司 | Locomotive radiator leakage rate prediction method |
| CN117805009A (en) * | 2024-01-11 | 2024-04-02 | 中国人民解放军陆军装甲兵学院 | Quick test analysis method for corrosion resistance of circular tube |
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