CN105510217B - It is a kind of for evaluating the device and method of metal composite pipe corrosion resistance - Google Patents
It is a kind of for evaluating the device and method of metal composite pipe corrosion resistance Download PDFInfo
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- CN105510217B CN105510217B CN201410488023.1A CN201410488023A CN105510217B CN 105510217 B CN105510217 B CN 105510217B CN 201410488023 A CN201410488023 A CN 201410488023A CN 105510217 B CN105510217 B CN 105510217B
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Abstract
The invention discloses a kind of for evaluating the device and method of metal composite pipe corrosion resistance.The device includes the connector of main body housing and main body housing both ends；The inner space of the main body housing is for placing metal composite pipe to be evaluated；The connector at main body housing both ends is used to be connected to pipeline where natural gas or other corrosive mediums；The metal composite pipe is the metal composite pipe being combined by two layers or more metal tube, has weld seam on the length direction of the metal composite pipe or does not have weld seam.The metal composite pipe can be connected to natural gas line or other corrosive mediums institute in the duct by the device of the invention, make the metal composite pipe in corrosive medium, test can be carried out to corrosion resistance of the metal composite pipe in practical corrosive environment, really, the corrosion resistance for accurately reflecting metal composite pipe and its weld seam, provides reliable, effective data for engineering site.
Description
Technical field
The present invention relates to a kind of for evaluating the device and method of metal composite pipe corrosion resistance.
Background technique
Metal composite pipe is the novel composite pipe that the metal tube of different performance is entrenched togather.Metal composite pipe retains
The advantages of different materials, compensate for the deficiency of homogenous material.It is anti-corrosion to replace that metal composite pipe is generallyd use both at home and abroad at present
Compo pipe.For surface gathering and transferring compound pipe, need that metal composite pipe links together by the method for welding.Weldering
Seam is usually link most weak in corrosive environment.For example, usually contained in natural gas the corrosivity such as hydrogen sulfide, carbon dioxide at
Point, metal composite pipe especially its weld seam position is easy to be corroded in this environment.And once corrode, Jiu Huizao
At natural gas leaking, the conveying of natural gas is influenced, or even accident can be caused.Therefore to the corrosion-resistant of metal composite pipe and its weld seam
Performance test extremely important.
The prior art for the evaluation method of the corrosion resistance of metal composite pipe and its weld seam is sampled on multiple tube,
The test such as weightlessness, stress corrosion is carried out to sample.But sample can only substantially represent the corrosion resisting property of entire multiple tube, it cannot
The corrosion resistance of entire multiple tube pipeline section is represented completely.There is remaining binding force and after compound pipe molding, between ectonexine,
Therefore button cannot reflect the mechanical state of internal layer completely, cannot reflect corrosion resistance of the multiple tube under match state
Energy.In addition, it is very difficult to obtain standard sample for the multiple tube weld seam of common specification.
Therefore, main problem of the existing technology is: the performance for the sample tested in the test method of the prior art
The corrosion resisting property of entire multiple tube can only be substantially represented, the corrosion resistance of entire multiple tube pipeline section cannot be represented completely.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of for evaluating the dress of metal composite pipe corrosion resistance
It sets and method, the device can accommodate whole section of metal composite pipe, then whole section of metal composite pipe is placed in practical corrosive environment
Its corrosion resistance of Direct Test reflects corrosion resistance of the metal composite pipe under combined state.
In order to solve the above technical problems, the present invention the following technical schemes are provided:
An aspect of of the present present invention provides a kind of for evaluating the device of metal composite pipe corrosion resistance, the metal composite
Pipe is the metal composite pipe being combined by two layers or more metal tube, has weld seam on the length direction of the metal composite pipe
Or do not have weld seam, which includes:
Main body housing and connector positioned at main body housing both ends；
The inner space of the main body housing is for placing metal composite pipe to be evaluated；
The connector positioned at main body housing both ends is used to manage with where natural gas line or other corrosive mediums
Road connection.
Further, the inner space of the main body housing is placed with the metal composite pipe.
Further, the inner space of the main body housing is provided with metal lining, the metal lining is located at described
The both ends of metal composite pipe.
Preferably, the metal lining is resisted against the both ends of the metal composite pipe.
Preferably, the thickness at the both ends of the metal composite pipe is greater than the thickness of interlude.
Preferably, the thickness at the both ends of the metal composite pipe be greater than interlude thickness, the two of the metal composite pipe
The thickness at end is identical as the thickness of the metal lining.
Preferably, it is sealed between the metal composite pipe and main body housing by sealing ring.
Preferably, opening has been put on outside the main body, for installing pressure gauge.
Preferably, the main body housing is connected to pipeline by-pass collar where natural gas line or other corrosive mediums.
Preferably, the main body housing and natural gas line or other corrosive mediums place pipeline by-pass collar pass through flange
Connection.
Device provided by the invention can be in pressure 15MPa hereinafter, 90 DEG C of temperature is hereinafter, concentration of hydrogen sulfide 90g/m3With
Under, gas concentration lwevel 50g/m3Hereinafter, normal use in chloride ion content 30000mg/L work condition environment below.Any gold
The metal composite pipe for belonging to compound and any complex method can evaluate corrosion resistance with device provided by the invention.
Another aspect of the present invention provides a kind of method for evaluating metal composite pipe corrosion resistance, and the metal is multiple
Closing pipe is the metal composite pipe being combined by two layers or more metal tube, has weldering on the length direction of the metal composite pipe
Seam does not have weld seam, comprising the following steps:
Step a, the described metal composite pipe be placed in first aspect present invention offer for evaluating metal composite pipe corrosion resistant
The inner space of the main body housing of the device of corrosion energy；
Step b, the device for being used to evaluate metal composite pipe corrosion resistance for providing first aspect present invention is by being somebody's turn to do
The connector of device be connected on natural gas line or other corrosive mediums where on pipeline；
Step c, by after a predetermined period of time, described device is disassembled；
Step d, the metal composite pipe in described device is taken out, the main body and welding of the metal composite pipe are measured
The mechanical property and/or chemical property of junction.
Specifically, in step d, mechanical property includes anti-stress cracking performance.
Specifically, in step d, the test method of the mechanical property is anti-H 2 S stress cracking method.
Specifically, in step d, the anti-H 2 S stress cracking method is NAVE TMO177-2005 standard C method.
Specifically, in step d, the chemical property is electrochemical corrosion test.
Specifically, in step d, the electrochemical corrosion test method is GB/T18590-2001.
The beneficial effects of the present invention are: providing a kind of dress for well station field evaluation metal composite pipe corrosion resistance
It sets and method.Whole section of metal composite pipe is placed in the main body jacket internal of device, natural gas line is connected to by main body housing
Or the natural gas in pipeline or other corrosive mediums is set to enter metal composite pipe, to gold on pipeline where other corrosive mediums
Belonging to corrosion resistance of the multiple tube in practical corrosive environment can be carried out test, more really, accurately reflection metal composite pipe and
Corrosion resistance of its weld seam in actual condition provides reliably and efficiently data for engineer operation.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the structural schematic diagram for the evaluating apparatus that the embodiment of the present invention 1 provides；
Fig. 2 is the structural schematic diagram of main body housing in the evaluating apparatus of the offer of the embodiment of the present invention 1；
Fig. 3 is the structural schematic diagram of two end flanges of main body housing in the evaluating apparatus of the offer of the embodiment of the present invention 1；
Fig. 4 is the structural schematic diagram of metallic packing ring in the evaluating apparatus of the offer of the embodiment of the present invention 1；
Fig. 5 is the structural schematic diagram of metal lining in the evaluating apparatus of the offer of the embodiment of the present invention 1.
Figure acceptance of the bid note respectively indicates:
1, main body housing；2, metal lining；3, metallic packing ring；4, metal composite pipe；
5, O-ring seal；6, it is open；7, weld seam；
D1, metal lining thickness；D2, metal composite pipe two-end thickness；
D3, metal composite pipe interlude two-end thickness.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into
One step it is described in detail.
In the present invention, on the one hand a kind of device for evaluating metal composite pipe corrosion resistance is provided, comprising:
The connector of main body housing and main body housing both ends；
The inner space of the main body housing is for placing metal composite pipe to be evaluated；
The connector at main body housing both ends is used to be connected to pipeline where natural gas line or other corrosive mediums.
In above-mentioned device, the inner space of the main body housing is placed with the metal composite pipe, by metal composite
Pipe is connected on natural gas line or other corrosive mediums place pipeline by main body housing, make natural gas in pipeline or other
Corrosive medium can enable metal composite pipe to undergo the corrosion test under actual condition, to metal by metal composite pipe
The corrosion resistance of multiple tube, which can be carried out, more accurately to be evaluated.
In above-mentioned device, the inner space of the main body housing is provided with metal lining, the metal lining supports
Lean against the both ends of the metal composite pipe；The effect of metal lining is the natural gas or the corrosion of other corrosive mediums prevented in pipeline
Main body housing.The corrosion-resistant stainless steels such as metal lining material preferred 316L, 304L.
In above-mentioned device, the thickness at the both ends of the metal composite pipe is greater than the thickness of interlude, can have in this way
Effect prevents metal composite pipe from directly contacting with metal lining, avoids that galvanic corrosion and crevice corrosion occurs, influences finally to test
Effect.And preferably, the thickness for belonging to two end tube section of multiple tube is identical as the thickness of metal lining.Example as shown in figure 1, Fig. 1
It is the structural schematic diagram for the evaluating apparatus that the embodiment of the present invention 1 provides, the thickness d 2 at the both ends of metal composite pipe is greater than interlude
Thickness d 3, and it is identical as metal lining thickness d 1.
In above-mentioned device, there is o-ring groove at the metal composite pipe both ends, pass through sealing between main body housing
Circle sealing, can prevent water, air from entering between metal composite pipe and main body housing, guarantee the accuracy of experimental result in this way.
Those skilled in the art can select the type of sealing ring, preferably O-ring seal, O-ring seal structure letter according to actual needs
It is single, biggish pressure can be born.
In above-mentioned device, opening is put on outside the main body, for installing pressure gauge, has been supervised by pressure gauge registration
The pressure inside metal composite pipe is controlled, experiment progress situation is monitored.
In above-mentioned device, the bypass of pipeline is filled where the main body housing and natural gas line or other corrosive mediums
Connection is set, experiment can be completed in the case where not influencing to work normally in this way.
In above-mentioned device, the evaluating apparatus can be connected to bypass dress with any means by those skilled in the art
It sets, it is preferred that flange, and sealed with metallic packing ring.Flanged joint, using most generally, can be born in industrial pipeline
Larger pressure, connection disassembling are convenient.The design of set both ends has metallic packing ring groove (position A as shown in figure 1) outside the main body；Metal
Sealing ring is mounted in above-mentioned metallic packing ring groove.
In above-mentioned device, the material of the main body housing is not specially required, it is preferred that metal, because of metal material
Expect that intensity is big, the processing is simple, and well station scene by-pass collar is also metal material, convenient for carrying out with well station scene by-pass collar
Connection.Wherein, the preferred titanium alloy of metal material can extend the use of device because titanium alloy intensity is high, corrosion resistance and good
Service life.
In above-mentioned device, the size of various pieces is bypassed according to the metal composite pipe size and well station scene
What device parameter determined.The device that design obtains in this way may be reused under the field condition of same well station, save the cost.?
Here there is no stringent limitation, as long as can cooperate well with well station scene by-pass collar, make the device of the invention normally and make
With.Those skilled in the art can determine the size of various pieces according to the relevant criterion and actual conditions of this field.It needs
It should be noted that metal composite length of tube and the sum of its both ends metal lining length are equal with main body length.
Device provided by the invention can be in pressure 15MPa hereinafter, 90 DEG C of temperature is hereinafter, concentration of hydrogen sulfide 90g/m3With
Under, gas concentration lwevel 50g/m3Hereinafter, normal use in chloride ion content 30000mg/L work condition environment below.Any gold
The metal composite pipe for belonging to compound and any complex method can evaluate corrosion resistance with device provided by the invention.
Another aspect of the present invention provides a kind of method for evaluating metal composite pipe corrosion resistance, comprising the following steps:
Step a, the inside that the described metal composite pipe is placed in the main body housing of the device of first aspect present invention offer is empty
Between；
Step b, by device that first aspect present invention provides by the connector of the device be connected to natural gas line or
Where other corrosive mediums on pipeline；
Step c, by after a predetermined period of time, described device is disassembled；
Step d, the metal composite pipe in described device is taken out, the main body and welding of the metal composite pipe are measured
The mechanical property and/or chemical property of junction.
In the step c of the above method, the pressure data inside metal composite pipe is observed by pressure gauge, according to number pressure
It is worth judgment experiment progress, it is ensured that experiment safety carries out.If pressure obviously becomes smaller, illustrate that metal composite pipe has occurred and that out
It splits, experiment can stop, and save the time.The connection type of pressure gauge and the evaluating apparatus is by those skilled in the art according to reality
Border situation determines；If pressure gauge registration keeps stablizing, after a predetermined time elapses, device is removed and takes out metal composite
Pipe carries out mechanical property and/or chemical property to metal composite pipe.
In the step d of the above method, mechanical property includes anti-stress cracking performance；Test method is by those skilled in the art
Member selects according to actual needs, such as carries out the test of anti-H 2 S stress cracking according to NAVE TMO177-2005 standard C method.
In the step d of the above method, the chemical property is electrochemical corrosion performance, and test method is also by this field
Technical staff selects according to actual needs, such as carries out according to GB/T18590-2001.
The above method is not limited solely to the evaluation of metal composite pipe corrosion resistance, those skilled in the art can root
Any test is carried out according to actual needs.
Embodiment 1
The present embodiment provides a kind of device and methods in day east 5-1 field evaluation metal composite pipe corrosion resistance.
What is conveyed in its east 5-1 field pipes is natural gas.
Its east 5-1 field working conditions (during test): pressure 10.1MPa, 60-70 DEG C of temperature, concentration of hydrogen sulfide 87.4g/m3,
Gas concentration lwevel 50.6g/m3, produce chloride ion content 24700mg/L in water, total hardness 1407mg/L, bicarbonate ion
3180mg/L。
Tested metal composite pipe is L245 carbon steel and the compound metal composite pipe of 825 steel alloys, the metal composite pipe range
Degree has weld seam on direction.
According to the live by-pass collar parameter in the station day Dong5-1Jing and need metal composite pipe size design manufacture master to be tested
External set 1, metal lining 2 and metallic packing ring 3.
For the structure of main body housing 1 as shown in Fig. 2, the shape of main body housing 1 is cylindrical body, both ends are flange arrangement；?
There are also trapezoidal metal o-ring groove (position A in figure), the knots of flange and metal o-ring groove at the both ends of main body housing 1
Structure is as shown in Figure 3；There are also openings 6 at the intermediate position of main body housing；Main body housing is manufactured with titanium alloy.
The structure of metallic packing ring 3 is as shown in Figure 4.
The structure of metal lining 2 is as shown in figure 5, the shape of metal lining 2 is cylindrical body, thickness d 1 and metal composite pipe
The thickness d 2 at 4 both ends is identical, and is greater than the thickness d 3 of 4 interlude of metal composite pipe；The stainless steel making of 304L of metal lining 2.
The sum of 4 length of metal composite pipe and two 2 length of metal lining and 1 equal length of main body housing.
O-ring seal groove is processed at 4 both ends of metal composite pipe.
Main body housing 1, metal lining 2, metal composite pipe 4, O-ring seal 5 are assembled according to the structural schematic diagram of Fig. 1
It is good, i.e., O-ring seal 5 is mounted in the O-shaped sealed groove of the metal composite pipe 4 with weld seam 7, then by metal composite pipe
4 are placed in main body housing 1, and metal lining 2 is resisted against 4 both ends of metal composite pipe.
One section of pipeline section in the bypass of well station scene, which is changed into, needs metal composite pipe to be tested；By flange by the evaluation
Device is connect with by-pass collar, is sealed between flange and flange with metallic packing ring 3；Pressure gauge is opened by covering outside main body
Mouth 6 is connected on metal composite pipe 4.
The switch for opening by-pass collar and natural gas line main pipeline junction, makes natural gas enter by-pass collar, in turn
Into metal composite pipe 4.
Pass through external pressure gauge observation experiment situation: after experiment carries out 1 month, pressure gauge registration still maintains steady
It is fixed, illustrate that there is no significantly cracking for the metal composite pipe.
Device is removed from bypass, metal composite pipe 4 is taken out from device, mechanics is carried out to it and electrochemistry is surveyed
Examination；Tiny cracking has been seen whether with magnifying glass, microscope；Resisting sulfide is carried out according to NAVE TMO177-2005 standard C method
Stress (SSC) cracking experiment；It is uniform according to NACE TMO177-2005 standard C method, GB10124-1988 metal material laboratory
It is real that experimental method is soaked in corrosion entirely, the burn into ISO15156-3 of GB/T18590-2001 can alloy carries out electrochemical corrosion
It tests.
This example demonstrates that the device of the invention and method can be carried out the corrosion resistance of whole section of metal composite pipe and comment
Valence.
Embodiment 2
The present embodiment provides a kind of device and methods in day east 5-1 field evaluation metal composite pipe corrosion resistance.
In the present embodiment, other than metal composite pipe to be changed to L360 carbon steel and the compound metal composite pipe of 825 steel alloys,
It is same as Example 1.
After experiment carries out 15 days, pressure gauge registration obviously becomes smaller, and illustrates that the metal composite pipe has occurred that cracking.No
It needs to carry out subsequent test to the metal composite pipe again.
The present embodiment again shows that, the device of the invention and method can corrosion resistance to whole section of metal composite pipe into
Row evaluation.
The above is merely for convenience of it will be understood by those skilled in the art that technical solution of the present invention, not to limit
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (9)
1. a kind of for evaluating the device of metal composite pipe corrosion resistance, the metal composite pipe is by two layers or more metal tube
The metal composite pipe being combined has weld seam on the length direction of the metal composite pipe or does not have weld seam, described
Device includes:
The connector of main body housing and main body housing both ends；
The inner space of the main body housing is for placing metal composite pipe to be evaluated；
The connector at main body housing both ends is used to be connected to pipeline where natural gas line or other corrosive mediums；
The inner space of the main body housing is placed with the metal composite pipe；
The both ends of the metal composite pipe have O-ring seal groove；
O-ring seal is mounted in the O-shaped sealed groove；
The inner space of the main body housing is provided with metal lining, the metal lining is resisted against the metal composite pipe
Both ends；
The thickness at the both ends of the metal composite pipe is greater than the thickness of interlude, the thickness at the both ends of the metal composite pipe and institute
The thickness for stating metal lining is identical；
The equal length of the sum of the length of the metal composite pipe and the length of two metal linings with the main body housing；
The main body housing is connected to pipeline by-pass collar where natural gas line or other corrosive mediums by flange；
The main body housing is manufactured by titanium alloy.
2. the apparatus according to claim 1, which is characterized in that opening has been put on outside the main body, for installing pressure gauge.
3. the apparatus according to claim 1, which is characterized in that the main body housing and natural gas line or other corrosion are situated between
Pipeline by-pass collar connection where matter.
4. a kind of method for evaluating metal composite pipe corrosion resistance, the metal composite pipe is by two layers or more metal tube
The metal composite pipe being combined has weld seam on the length direction of the metal composite pipe or does not have weld seam, described
Method the following steps are included:
Step a, it is described in any item for evaluating metal composite pipe corrosion resistant that the described metal composite pipe is placed in claims 1 to 3
The inner space of the main body housing of the device of corrosion energy；
Step b, by the described in any item devices for being used to evaluate metal composite pipe corrosion resistance of claims 1 to 3 by being somebody's turn to do
The connector of device be connected on natural gas line or other corrosive mediums where on pipeline；
Step c, by after a predetermined period of time, described device is disassembled；
Step d, the metal composite pipe in described device is taken out, the main body and welded connecting of the metal composite pipe are measured
The mechanical property and/or chemical property at place.
5. according to the method described in claim 4, it is characterized in that, mechanical property includes anti-stress cracking in step d
Energy.
6. according to the method described in claim 4, it is characterized in that, the test method of the mechanical property is anti-in step d
Hydrogen sulfide stress cracking method.
7. according to the method described in claim 6, it is characterized in that, in step d, the anti-H 2 S stress cracking method is
NAVE TMO177-2005 standard C method.
8. according to the method described in claim 4, it is characterized in that, the chemical property is electrochemical corrosion in step d
Test.
9. according to the method described in claim 4, it is characterized in that, in step d, the electrochemical corrosion test method is
GB/T 18590-2001。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410488023.1A CN105510217B (en) | 2014-09-23 | 2014-09-23 | It is a kind of for evaluating the device and method of metal composite pipe corrosion resistance |
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|---|---|---|---|
| CN201410488023.1A CN105510217B (en) | 2014-09-23 | 2014-09-23 | It is a kind of for evaluating the device and method of metal composite pipe corrosion resistance |
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| CN105510217A CN105510217A (en) | 2016-04-20 |
| CN105510217B true CN105510217B (en) | 2019-04-09 |
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| CN107991225B (en) * | 2018-01-03 | 2021-02-26 | 西南石油大学 | Corrosion in-situ monitoring system for natural gas hydrate solid-state fluidization exploitation pipeline |
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| US4092844A (en) * | 1976-08-20 | 1978-06-06 | Continental Oil Company | Hydrogen probe with limited active area |
| US7318672B2 (en) * | 2005-03-31 | 2008-01-15 | Atlas Material Testing Technology, L.L.C. | Specimen heater and control system for accelerated weathering test apparatus |
| CN204116199U (en) * | 2014-09-23 | 2015-01-21 | 中国石油天然气股份有限公司 | A kind of device for evaluating metal composite pipe decay resistance |
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