CN108414345A - A kind of erosion experiment bend pipe of configuration cathode protection device - Google Patents
A kind of erosion experiment bend pipe of configuration cathode protection device Download PDFInfo
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- CN108414345A CN108414345A CN201810227773.1A CN201810227773A CN108414345A CN 108414345 A CN108414345 A CN 108414345A CN 201810227773 A CN201810227773 A CN 201810227773A CN 108414345 A CN108414345 A CN 108414345A
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- bend pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
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Abstract
The present invention relates to a kind of erosions of configuration cathode protection device to test bend pipe, including detachable bend pipe is bowed out, arch, clip in detachable bend pipe; platinum electrode, reference electrode, electrochemical workstation test test piece; screw rod, nut, one component room temperature cure silicone rubber and connecting line；Screw rod and test piece are tightened first, screw rod passes through the aperture on bend pipe and fixed with nut, is bonded with silicone rubber seal, is fixed with clip with silicon rubber filling, the bowed out and interior arch of bend pipe at test piece slot and aperture gap；One word translot end of screw rod, platinum electrode and reference electrode are finally accessed into electrochemical workstation by connecting line, electrochemical workstation can provide cathodic protection for all test pieces.The present invention can not only quantify the practical erosion rate at each position of bend pipe by weight-loss method, it is thus also avoided that corrode the influence generated to experimental result in erosion process.Compared with bend pipe is tested in existing erosion, has many advantages, such as that compact-sized, test point is more and comprehensive, error is small, have wide range of applications.
Description
Technical field:
The present invention discloses a kind of erosion experiment bend pipe of configuration cathode protection device, is especially used under experiment condition study
A kind of experiment bend pipe of two phase flow or multiphase flow to bend pipe erosion situation.
Background technology:
Erosion be metal surface and monophasic fluid or carry solid particle fluid between generate mechanical movement, so as to cause
Metal material loss the phenomenon that.Erosion is widely present in the industrial process such as mine, metallurgy, water conservancy, petrochemical industry.Exposure
The various types of installations and facilities of such as pipeline, pipe fitting, valve, pump in moving fluid, all can be by different degrees of erosion
It destroys.
In the two phase flow or multiphase flow containing solid phase particles, erosion attack is very serious, it will greatly shorten equipment
Service life.For example, the oil composition exported from underground is complicated, generally entail the gentle body of solid-state silt, these silts and associated gas with
Fluid moves together, and erosion is caused to tube inner wall.In oilfield exploitation procedure, due to the complexity of formation condition and casing programme
Property, easily there is phenomena such as shaking out, wearing when developing extended reach well.As China oil field subsequently enters the middle and later periods of exploitation, oil
Well depth is more and more deeper, and exploitation difficulty is also increasing, and the sand content in output content from oil well is higher and higher, surface gathering and transferring pipeline face
Face serious erosion problem.Pipeline erosion is a sufficiently complex process, it with gas-liquid phase flow rate, pipeline geometrical construction,
The factors such as tube wall material, sand particle size, sediment transport rate, sand grains grain size have relationship, and by solid phase particles factor, liquid phase side
The influence of all many factors such as factor, hydrodynamic factor, the material factor in face, therefore, design are a kind of convenient for research bend pipe
The experimental provision of erosion is very necessary.
Patent of invention CN201710598423 discloses a kind of slurry transportation pipeline erosion abrasion test device and measurement side
Method, including autoclave body, sample frame, sample, slurry, sealing cover, motor, driving belt, loading line, control system.Sample frame, slurry
Body is arranged in autoclave body, and sealing cover setting is connected in autoclave body top, loading line inside autoclave body；Motor, driving belt, control system
System is arranged outside autoclave body；Motor drives driving belt to be connected with sample frame, drives sample rotation.It is starched using sample simulation is accelerated
Body measures the erosive wear of inner wall of the pipe the erosion-wear-resisting performance of material.The device exists in use asks as follows
Topic：When in autoclave body slurry density inhomogeneities, making experimental result, there are errors；Second is that the air meeting in slurry and sample
Contact is corroded, and can be had an impact to the experimental result of erosion；Third, sample used is handled according to uniform erosion, with pipe bent position
Erosion situation is different, therefore the device is little to bend pipe erosion research significance.
Utility model patent CN201620086145 discloses a kind of experiment bend pipe, including：It is chassis, bolt hole, inside groove, curved
Pipe, interior buttress lacing film, lacing film and bowed out wall hanging piece, the inside groove are dug in chassis centre position global formation, and chassis surrounding is opened
It is carved with bolt hole, the bending plumbing chase formation bend pipe that inside chassis, which is dug, to be had and practical pipeline is isometrical, bend pipe both sides and inside and outside
The equidistant digging of arch wall has several apertures that are rectangular, having certain depth, and for inlaying lacing film, the bend pipe is embedded on chassis, institute
It states crook in bend pipe and is fixedly connected with interior buttress lacing film, the outer crook of the bend pipe is fixedly connected with outer wall lacing film, and the bend pipe is solid
Surely it is connected with lacing film, it is more convenient for directly studying erosion using practical bend pipe, and can be repeated several times and make
With, it is possible to reduce the cost of research.But there are the following problems in use for the device：First, this device is divided into upper and lower two
Piece, intermediate gap meeting fluid flow state has an impact, to influence the erosion situation of lacing film；Second is that in experimentation, hang
Piece corrosion phenomenon is difficult to avoid that.In order to overcome the deficiencies of existing technologies, the present invention proposes a kind of rushing for configuration cathode protection device
Erosion experiment bend pipe, not only can also quantify rushing for bend pipe concrete position to avoid the corrosion phenomenon of test piece in erosion experimentation
Rate is lost, determines bend pipe erosion most serious position, to optimize bend pipe design, reduces erosion risk.It is tested with existing erosion curved
Pipe is compared, and is had many advantages, such as that compact-sized, test point is more and comprehensive, error is small, is had wide range of applications.
Invention content：
The present invention relates to a kind of erosions of configuration cathode protection device to test bend pipe, including detachable bend pipe is bowed out, removable
Unload arch in bend pipe, clip, platinum electrode, reference electrode, electrochemical workstation tests test piece, screw rod, nut, and one component room temperature is solid
SiClx rubber and connecting line；Screw rod and test piece are tightened first, screw rod passes through the aperture on bend pipe and fixed with nut, test piece slot
It is bonded with silicone rubber seal, is fixed with clip with silicon rubber filling, the bowed out and interior arch of bend pipe at aperture gap；Finally by screw rod
One word translot end, platinum electrode and reference electrode access electrochemical workstation by connecting line, and electrochemical workstation can be all
Test piece provides cathodic protection.
The detachable bend pipe is bowed out, interior encircle is made of superhigh molecular weight polyethylene material, bowed out and interior arch splicing
For 90 ° of bend pipes, flange is arranged in both ends；There are 21 experiment test piece slots in wherein bowed out inside, and 1 diameter of section 8mm's passes through
The through hole of hole and 1 diameter of section 10mm are respectively intended to stationary platinum electrode and reference electrode, there is 15 experiment examinations inside interior arch
Film trap, all test piece trench bottoms are designed with the aperture passed through for screw rod.
The experiment test piece is prepared by X60 Steel materials, and shape is cuboid, and size is 8mm × 6mm × 5mm,
In a face 8mm × 6mm center be provided with for screw rod connect and depth be 3mm hole.
The nut stem material is X60 steel, and shape is cylinder, and section circular diameter 3mm, outer surface is covered with helicla flute, spiral shell
There are one " one " word translots for bar wherein one end.
The nut is that X60 Steel materials are prepared, and shape is hexagonal prisms, is coordinated with screw rod.
The one component room temperature cure silicone rubber plays test piece to fill the gap between test piece and test piece slot
Certain fixed function.
Saturated potassium chloride solution is filled in the reference electrode.
Compared with prior art, the present invention has the advantages that：
(1) compared with directly studying erosion using practical bend pipe, this bend pipe is reusable, reduces research cost；
(2) this erosion experiment bend pipe is it is possible to prevente effectively from corrosion phenomenon in experimentation, improves erosion experimental precision；
(3) the practical erosion rate that can quantify each position of bend pipe by weight-loss method, carries for the actual production of bend pipe
For guidance；
(4) compared with bend pipe is tested in existing erosion, have many advantages, such as that compact-sized, test point is more and comprehensive, error is small, answer
With in extensive range.
Description of the drawings：
Fig. 1 is schematic structural view of the invention, wherein detachable bend pipe is bowed out 1, arch 2, clip 3, platinum electricity in detachable bend pipe
Pole 4, reference electrode 5, electrochemical workstation 6, one component room temperature cure silicone rubber 10, connecting line 11；
Fig. 2 is present invention experiment bend pipe structure schematic diagram；
Fig. 3 is present invention experiment bend pipe sectional view；
Fig. 4 is the bowed out structural schematic diagram of the detachable bend pipe of the present invention；
Fig. 5 is arch structure schematic diagram in the detachable bend pipe of the present invention；
Fig. 6 is test piece of the present invention, screw rod, nut connecting structure schematic diagram, wherein test piece 7, screw rod 8, nut 9.
Specific implementation mode:
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the present invention relates to a kind of erosions of configuration cathode protection device to test bend pipe, including detachable bend pipe
Bowed out 1, the interior arch 2 of detachable bend pipe, clip 3, platinum electrode 4, reference electrode 5, electrochemical workstation 6, experiment test piece 7, screw rod 8,
Nut 9, one component room temperature cure silicone rubber 10 and connecting line 11；Screw rod 8 and test piece 7 are tightened before experiment, screw rod 8 is passed through curved
Bowed out 1 and the aperture on interior arch 2 and with the fixation of nut 9 are managed, will be filled with silicon rubber 10 at gap, then by bend pipe bowed out 1 and interior
The sealing bonding of silicon rubber 10 of arch 2, is fixed with clip 3；Finally by 8 one word translot end of screw rod, platinum electrode 4 and reference electrode 5
Electrochemical workstation 6 is accessed by connecting line 11.
Detachable bend pipe bowed out 1 and interior arch 2 seal bonding by silicon rubber 10 and are fixed with clip 3 in the present embodiment.
Test piece 7 is fastened on elbow internal wall by screw rod 8 and nut 9 in the present embodiment, with 10 blind of silicon rubber
And play certain fixed function.
8 one word translot end of screw rod, platinum electrode 4 and reference electrode 5 access electrochemistry by connecting line 11 in the present embodiment
Work station 6.Test test piece 7, platinum electrode 4 and reference electrode 5 with erosion media contact, wherein platinum electrode 4 connects electrochemical operation
Stand 6 anode, experiment test piece 7 connect 6 cathode of electrochemical workstation.Electrochemical workstation 6 is additional to 7 surface of experiment test piece application one
Electric current makes experiment test piece 7 become cathode, to realize the protection to test piece 7.Its course of work is a negative-feedback amplification ---
Output system constitutes closed loop with test piece 7 and adjusts, measures 7 current potential of test piece by reference electrode 5, believe as sampled signal and control
It number is compared, to adjust polarization current output, 7 current potential of test piece is made to be maintained on setting controlling potential.
Pre-treatment flow is tested in test piece 7 in the present embodiment：8mm × 6mm × 5mm, work area s are processed into initial test piece 7
About 48mm2.7 working face of test piece is polished successively with 240#, 600# and 1000# silicon carbide paper, with anhydrous after acetone cleans
Test piece 7 is placed on clean filter paper after being dried up with cold wind, is put into test piece box by ethanol dewatering, is then done in vacuum drying chamber
It is dry to weigh afterwards (be accurate to 0.01mg) for 24 hours.When weighing, test piece 7 is weighed 5 times, is averaged after removing maximum value and minimum value,
Preceding weight is tested as test piece 7, the size of test piece 7 after being used in combination vernier caliper measurement to polish.
The experiment of test piece 7 post-processing flow in the present embodiment：Experiment terminates to take out test piece 7, removes surface impurity, and process is anhydrous
It is weighed (weighing method is same as above) using high Accuracy Electronic Balance after ethanol dewatering.Calculate its erosion weight loss rate.
Erosion weight loss rate computational methods are as follows in the present embodiment：
The erosion rate that weight-loss method is calculated is average erosion speed, therefore weight-loss method is relatively adapted to measure averagely
Erosion speed, but be not suitable for measuring instantaneous erosion speed.The calculating of erosion rate is as shown in formula 1：
In formula：
V：The erosion rate indicated with weight change, g/ (m2h)；
△W：7 erosion forward backward averaging of test piece is weightless, g；
s：7 work area of test piece, m2；
t：Experimental period, h；
ρ：The density of carbon steel, g/cm3。
The erosion speed that formula (1) is calculated can not be used for indicating the erosion loss depth of metal surface, even
Even erosion can not also indicate the erosion depth of metal, this is because the density of material of different metal has differences.In order to indicate not
With the erosion depth of metal, available depth method characterizes erosion speed.The erosion speed indicated with weight, which can be converted into, uses depth
The erosion rate of expression, conversion is as shown in formula (2)：
In formula：
Kd：The erosion speed indicated with erosion depth, mm/a；
ρ：The density of test piece 7, g/cm3；
V：The erosion rate indicated with weight change, g/ (m2h)；
s：The work area of test piece 7, m2；
t：The time that erosion carries out, h.
It can be seen that studying erosion with this bend pipe from above-described embodiment, more convenient, bend pipe is reusable, reduces
The cost of research installs test piece 7 using this bend pipe, can quantify the practical erosion feelings at each position of bend pipe by weight-loss method
Condition provides guidance for the optimization design of bend pipe.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each component, connection type and manufacture craft etc. are all
It can be varied from, every equivalents carried out based on the technical solution of the present invention and improvement should not exclude
Except protection scope of the present invention.
Claims (5)
1. bend pipe is tested in a kind of erosion of configuration cathode protection device, it is characterised in that：It includes that detachable bend pipe is bowed out, removable
Unload arch in bend pipe, clip, platinum electrode, reference electrode, electrochemical workstation tests test piece, screw rod, nut, and one component room temperature is solid
SiClx rubber and connecting line；Screw rod and test piece are tightened first, screw rod passes through the aperture on bend pipe and fixed with nut, test piece slot
It is bonded with silicone rubber seal, is fixed with clip with silicon rubber filling, the bowed out and interior arch of bend pipe at aperture gap；Finally by screw rod
One word translot end, platinum electrode and reference electrode access electrochemical workstation by connecting line, and electrochemical workstation can be all
Test piece carry it is a kind of configuration cathode protection device erosion test bend pipe for cathodic protection.
2. bend pipe is tested in a kind of erosion of configuration cathode protection device according to claim 1, it is characterised in that：Described
Detachable bend pipe is bowed out, interior encircle is made of superhigh molecular weight polyethylene material, and bowed out and interior arch is spliced into 90 ° of bend pipes,
Flange is arranged in both ends；There are 21 experiment test piece slots, the through hole and 1 diameter of section of 1 diameter of section 8mm in wherein bowed out inside
The through hole of 10mm is respectively intended to stationary platinum electrode and reference electrode, there is 15 experiment test piece slots, all test piece slots inside interior arch
Bottom is designed with the aperture passed through for screw rod.
3. bend pipe is tested in a kind of erosion of configuration cathode protection device according to claim 1, it is characterised in that：Described
Experiment test piece is prepared by X60 Steel materials, and shape is cuboid, and size is 8mm × 6mm × 5mm, one of 8mm × 6mm
The center in face be provided with for screw rod connect and depth be 3mm hole.
4. bend pipe is tested in a kind of erosion of configuration cathode protection device according to claim 1, it is characterised in that：Described
Nut stem material is X60 steel, and shape is cylinder, section circular diameter 3mm, and outer surface is covered with helicla flute, and screw rod wherein one end has one
A " one " word translot.
5. bend pipe is tested in a kind of erosion of configuration cathode protection device according to claim 1, it is characterised in that：Described
One word translot end of screw rod, platinum electrode and reference electrode access electrochemical workstation by connecting line, and electrochemical workstation is institute
There is test piece to provide cathodic protection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810227773.1A CN108414345A (en) | 2018-03-20 | 2018-03-20 | A kind of erosion experiment bend pipe of configuration cathode protection device |
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| CN201810227773.1A CN108414345A (en) | 2018-03-20 | 2018-03-20 | A kind of erosion experiment bend pipe of configuration cathode protection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398433A (en) * | 2019-08-31 | 2019-11-01 | 西南石油大学 | A kind of multi-phase flow erosion wear test platform applied to tubular test coupon |
| CN110715848A (en) * | 2019-10-30 | 2020-01-21 | 西南石油大学 | Stress erosion corrosion experimental apparatus |
| CN110887757A (en) * | 2019-11-18 | 2020-03-17 | 中国船舶重工集团公司第七二五研究所 | Gas-liquid-solid multiphase flow pipeline erosion experimental device and testing method thereof |
| CN111474110A (en) * | 2020-04-03 | 2020-07-31 | 常州大学 | Visual image monitoring flowing corrosion test device for bent pipe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398433A (en) * | 2019-08-31 | 2019-11-01 | 西南石油大学 | A kind of multi-phase flow erosion wear test platform applied to tubular test coupon |
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| CN110887757A (en) * | 2019-11-18 | 2020-03-17 | 中国船舶重工集团公司第七二五研究所 | Gas-liquid-solid multiphase flow pipeline erosion experimental device and testing method thereof |
| CN111474110A (en) * | 2020-04-03 | 2020-07-31 | 常州大学 | Visual image monitoring flowing corrosion test device for bent pipe |
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