CN208109662U - Evaluate the device of pipe line steel cracking resistance sensitivity tests in acidic environment - Google Patents
Evaluate the device of pipe line steel cracking resistance sensitivity tests in acidic environment Download PDFInfo
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- CN208109662U CN208109662U CN201820541999.4U CN201820541999U CN208109662U CN 208109662 U CN208109662 U CN 208109662U CN 201820541999 U CN201820541999 U CN 201820541999U CN 208109662 U CN208109662 U CN 208109662U
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- pipeline section
- line steel
- acidic environment
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Abstract
The utility model discloses a kind of devices for evaluating pipe line steel cracking resistance sensitivity tests in acidic environment, including annular pipeline section charging assembly, end sealing component and non-destructive testing component, the charging assembly include outer charging assembly and interior charging assembly；The end sealing component includes the sealing ring and sealing cover that ring test pipeline section both ends are arranged in, and is provided with pore and its sealing element on two sealing covers；The non-destructive testing component includes ultrasonic detector and hydrogen flux measurement instrument.Evaluation pipe line steel is in acidic environment cracking resistance sensibility on the basis of the utility model cannot not may be implemented in brokenly itself sub internal stress of endless tube, maintain initial surface state, it obtains and evaluates more quantized datas than small size sample, more comprehensively can reliably assess cracking resistance sensibility of the pipe line steel in acidic environment.In addition, 1 annular can be completed at the same time the evaluation to tube body, tubulation weld seam and butt weld by test section.
Description
Technical field
The utility model relates to a kind of devices for evaluating pipe line steel cracking resistance sensitivity tests in acidic environment.
Background technique
With the continuous exploration and development of natural gas data, the accounting of acid gas field is increased, the major production areas of China's natural gas
It is acid gas field, such as：The gas field of Chuan-yu oil gas field, the gas field of Turkmenistan and Kazakhstan is all acid gas field.In acid
Property environment under, environmental cracking risk caused by having the pipe line steel pool based on carbon steel and low alloy steel material because of H2S, including
HIC, SOHIC and SSC failure mechanism, especially HIC and SSC.According to existing standards system, when pipe line steel is envisaged for acyclic acidic
When border, manufacturing process should carry out SSC and HIC evaluation；For welding point, also require to carry out SSC and HIC in welding procedure
Evaluation.Currently, sample is taken in the test of SSC test evaluation, that is, splits tube body or welding point intercepts one piece of sample and is reprocessed into
Small size sample（Such as：Four-point bending load stripe shape sample, C-shaped ring sample, NOL ring load pole sample etc.）, then use
SSC test is carried out after corresponding loading method load.Using different loading methods, the sensibility of test result is also not to the utmost
Together, sensibility is followed successively by：Four-point bending<C-shaped ring<NOL ring.
It is convenient and efficient using small size sample, it is easy to carry out test, still, test acquisition information content is relatively single, cannot
The speed of the germinating and extension of monitoring crack.HIC test need off-test take out after can just check for HIC crackle with
And measurement crackle have how long；The standard of SSC trial judgement is exactly the test seen whether through 720h, and wherein four-point bending loads
With C-shaped ring load due to being placed in closed test chamber, observation could be only taken out after the test period, if sample
Cracked, rupture time cannot be obtained, can not in test failure termination test immediately.Pipe is in manufacture and welding process
In, more or less all there is residual stress, split pipeline, residual stress discharges part, in the preparation process of small size sample
Can change in homogeneous tube stress.The release of residual stress is irreversible variation, and the residual stress discharged can not
Quantization measurement, therefore the loading procedure of follow-up test can not also make up.In addition, in order to ensure the repetition of small size sample result
Property, specimen surface is usually polished to identical finish, the highly polished reset condition in pipeline, however, poor surface
State is often easier to cause to corrode and induces crack initiation.The manufacturing process of different pipe line steel manufacturers has differences,
These features of small size sample weaken the internal stress of manufacture or welding process generation and surface roughness exists to pipe line steel
The influence of cracking resistance sensibility in acidic environment, not can truly reflect the superiority and inferiority of manufacturing process.
In view of deficiency existing for small size sample, some well-known companies are in the world in order to more preferably assess pipe line steel in acidity
Sensibility under environment is advocated and carries out test evaluation, especially pipe in manufacturing process or welding procedure using annular pipeline section
The evaluation of middle acid-resisting environmental cracking.However, carrying out the test under acidic environment using cyclic annular pipeline section, difficulty will be mentioned substantially
Rise, existing test method and experimental rig will no longer be applicable in, need to re-establish it is a set of can safety operation test method and
Experimental rig.
Summary of the invention
The shortcomings that the utility model is overcome in the prior art provides a kind of evaluation pipe line steel and resists in acidic environment and open
The device for splitting sensitivity tests makes pipeline section keep expected load, then by applying a certain amount of deflection to annular pipeline section
The seal assembly for connecting test section both ends, using annular pipeline section itself as test chamber, injection testing medium, to realize
Whether cracking resistance sensitivity tests of the pipe line steel in acidic environment needs to mend during test by hydrogen flux monitoring solution
Fill H2S, by ultrasonic wave measurement technique periodic detection crack initiation and propagation situation, to realize in not broken endless tube itself
Stress, maintain initial surface state on the basis of to pipe line steel the thoroughly evaluating of acidic environment cracking resistance sensibility function.
The technical solution of the utility model is：A kind of dress for evaluating pipe line steel cracking resistance sensitivity tests in acidic environment
It sets, including annular pipeline section charging assembly, end sealing component and non-destructive testing component, the charging assembly includes outer charging assembly
With interior charging assembly, wherein：The outer charging assembly is to be symmetricly set on ring test pipeline section outer wall by what fastener connected
Two pieces of load blocks；The interior charging assembly includes that load blend stop and sleeve nut, the load blend stop are symmetricly set on ring
Shape test section inner wall is provided with spherical groove in the middle part of the forward surface that two load blend stop, the sleeve nut both ends
Dome-type convex surface is placed in the spherical groove of two load blend stops；The end sealing component includes being arranged in ring test pipe
The sealing ring and sealing cover at section both ends, are provided with pore and its sealing element on two sealing covers, and the pore is step spiral shell
Pit；The non-destructive testing component includes ultrasonic detector and hydrogen flux measurement instrument, the ultrasonic detector and hydrogen flux
The probe of measuring instrument is arranged in ring test pipeline section outer wall.
Compared with prior art, the utility model has the advantages that：Existing small size sample evaluation pipe line steel is solved in acid
When property environment cracking resistance sensibility there are the problem of.Using this experimental rig, it can be achieved that in itself sub internal stress of not broken endless tube, dimension
Evaluation pipe line steel is obtained than small size sample evaluation more in acidic environment cracking resistance sensibility on the basis of holding initial surface state
More quantized datas more comprehensively can reliably assess cracking resistance sensibility of the pipe line steel in acidic environment.In addition, 1 annular
Evaluation to tube body, tubulation weld seam and butt weld can be completed at the same time by test section, and then needed using small size sample
The evaluation of related content could be completed by carrying out multiple groups test.
Detailed description of the invention
The utility model will illustrate by example and with reference to the appended drawing, wherein：
Fig. 1 is the top view of pipe section exterior loading method；
Fig. 2 is the cross-sectional view of pipe section exterior loading method；
Fig. 3 is the top view of inner tube segment loading method；
Fig. 4 is the cross-sectional view of inner tube segment loading method.
Specific embodiment
A kind of experimental rig using annular pipeline section evaluation pipe line steel cracking resistance sensibility in acidic environment, extremely such as Fig. 1
Shown in Fig. 4, including annular pipeline section charging assembly, end sealing component and non-destructive testing component, charging assembly are divided into external load
Two classes are loaded with inside, wherein：The outer charging assembly includes load block 2-1 and fastener 3-1, and interior charging assembly includes adding
Carry blend stop 2-2 and sleeve nut 3-2；The end sealing component includes sealing cover 6, sealing ring 7, fastening bolt 8, gas-liquid disengaging
Mouth seal assembly 9, valve a and b；The non-destructive testing component includes ultrasonic detector and hydrogen flux measurement instrument, loads block
There is arc-shaped groove on 2-1, load block is fixed and is dismantled by fastener 3-1；Load blend stop 2-2 has spherical surface recessed
Slot, the both ends sleeve nut 3-2 are dome-type convex surface, and load blend stop 2-2 and sleeve nut 3-2 uses resistance to H2The anti-corrosion conjunction of S corrosion
Golden material, the load outer surface blend stop 2-2 is coated with insulated paint, to avoid influence of the galvanic corrosion to test.The pipe of test section 1
End is prefabricated with threaded hole, and there is threaded hole at 6 edge of sealing cover, and sealing ring 7 has the aperture to match with sealing cover 6, sealing cover 6 and pipe
Body is fixed and is dismantled by fastening bolt 8；Sealing cover 6 and sealing ring 7 use resistance to H2The nonmetallic materials of S, wherein sealing
Ring 7 is elastic material.
One）Environment resistant cracking sensitivity test under external load mode
For small-bore pipeline section, first ring test pipeline section 1 is placed between two load block 2-1 grooves, then with tightly
Firmware 3-1 connects two pieces of load block 2-1, then reduces the spacing between load block 2-1 using external load, makes
Pipeline section deforms, when the dependent variable of pipeline section reaches expected, the nut of clinch fastener 3-1.
After loaded, sealing ring 7 and sealing cover 6 are successively first placed at the both ends of pipeline section 1, then screw fastening bolt 8,
Then pipe is inserted into the hole on sealing cover, and locking gas-liquid imports and exports seal assembly 9, installs valve respectively at the both ends of pipe
A and b, valve a are connected to exhaust treatment system, and valve b joint test solution system opens valve a and b, are pressed into from valve b acid
Testing liquid, original gas is discharged into exhaust treatment system by valve a in pipeline section, after being pressed into expected testing liquid, closes
Valve a and b, start to test.During test, ultrasonic probe 4 and hydrogen flux measurement instrument probe 5 are installed in pipeline section outer wall, periodically
Check the crack initiation and propagation situation of pipeline section sensitive part, measurement hydrogen permeates situation.If hydrogen flux monitoring is to hydrogen infiltration capacity
It is decreased obviously, H is supplemented into testing liquid by valve b2S gas.If crack length is more than to sentence useless standard, stop trying
It tests；After the test, valve a is connected to nitrogen cylinder, and valve b is connected to liquid waste treatment system, is opened valve a and b, is passed through valve
A injects nitrogen and testing liquid is emitted into liquid waste treatment system.
Two）Environment resistant cracking sensitivity test under internal loading method
For heavy caliber pipeline section, two load blend stop 2-2 are first placed in 1 middle position of ring test pipeline section, then by sleeve
The dome-type convex surface at the both ends nut 3-2 is placed in the spherical groove of two load blend stops, then screws out set using external load
The threaded rod at cylinder nut both ends, makes pipeline section deform, when the dependent variable of pipeline section reaches expected, locking sleeve nut 3-2.
After loaded, sealing ring 7 and sealing cover 6 are successively first placed at the both ends of pipeline section 1, then screw fastening bolt 8,
Then pipe is inserted into the hole on sealing cover, and locking gas-liquid imports and exports seal assembly 9, installs valve respectively at the both ends of pipe
A and b, valve a are connected to exhaust treatment system, and valve b joint test solution system opens valve a and b, are pressed into from valve b acid
Testing liquid, original gas is discharged into exhaust treatment system by valve a in pipeline section, after being pressed into expected testing liquid, closes
Valve a and b, start to test.During test, ultrasonic probe 4 and hydrogen flux measurement instrument probe 5 are installed in pipeline section outer wall, periodically
Check the crack initiation and propagation situation of pipeline section sensitive part, measurement hydrogen permeates situation.If hydrogen flux monitoring is to hydrogen infiltration capacity
It is decreased obviously, H is supplemented into testing liquid by valve b2S gas.If crack length is more than to sentence useless standard, stop trying
It tests；After the test, valve a is connected to nitrogen cylinder, and valve b is connected to liquid waste treatment system, is opened valve a and b, is passed through valve
A injects nitrogen and testing liquid is emitted into liquid waste treatment system.
The working principle of the utility model is：Using annular pipeline section as the test specimen being evaluated, pipe is maintained to make
Make or welding process in internal stress and surface state be not corrupted such that the internal characteristics of test section itself and pipe scene take
It is consistent to use as a servant situation.It is given by charging assembly and a stable dependent variable is provided by test section, so that by test section
Bear stable load.By end sealing component, the test section after making sealing becomes the test chamber of itself test.Pass through
Non-destructive testing component realizes the monitoring of crack initiation and propagation and hydrogen infiltration capacity to pipeline section sensitive position during test,
Obtain test data more abundant than existing small size sample.
Claims (6)
1. a kind of device for evaluating pipe line steel cracking resistance sensitivity tests in acidic environment, it is characterised in that：Including ring pipe
Section charging assembly, end sealing component and non-destructive testing component, the charging assembly include outer charging assembly and interior charging assembly,
Wherein：The outer charging assembly is that the two pieces of loads for being symmetricly set on ring test pipeline section outer wall connected by fastener are kept off
Block；The interior charging assembly includes that load blend stop and sleeve nut, the load blend stop are symmetricly set in ring test pipeline section
Wall is provided with spherical groove in the middle part of the forward surface that two load blend stop, and the dome-type convex surface at the sleeve nut both ends is put
It sets in the spherical groove for loading blend stop at two；The end sealing component includes the sealing that ring test pipeline section both ends are arranged in
Ring and sealing cover are provided with pore and its sealing element on two sealing covers；The non-destructive testing component includes ultrasonic wave inspection
Instrument and hydrogen flux measurement instrument are surveyed, the probe setting of the ultrasonic detector and hydrogen flux measurement instrument is outside ring test pipeline section
Wall.
2. the device of evaluation pipe line steel cracking resistance sensitivity tests in acidic environment according to claim 1, feature
It is：Ring test pipeline section outer wall contact position is provided with arc-shaped groove on the load block.
3. the device of evaluation pipe line steel cracking resistance sensitivity tests in acidic environment according to claim 1, feature
It is：The load blend stop and sleeve nut use anti-H2The corrosion resistant alloy of S cracking is made, and is coated on the load blend stop surface
Insulated paint.
4. the device of evaluation pipe line steel cracking resistance sensitivity tests in acidic environment according to claim 1, feature
It is：It is prefabricated with threaded hole at ring test pipeline section both ends, the sealing cover edge is provided with threaded hole, is set on sealing ring
It is equipped with the aperture to match with sealing cover edge-wise threads hole, the end sealing component and ring test pipeline section pass through fastening bolt
It is fixed and dismantles.
5. the device of evaluation pipe line steel cracking resistance sensitivity tests in acidic environment according to claim 1, feature
It is：The sealing cover and sealing ring use resistance to H2The nonmetallic materials of S are made, and wherein sealing ring is elastic material.
6. the device of evaluation pipe line steel cracking resistance sensitivity tests in acidic environment according to claim 1, feature
It is：The pore is step threaded hole.
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| CN201820541999.4U CN208109662U (en) | 2018-04-17 | 2018-04-17 | Evaluate the device of pipe line steel cracking resistance sensitivity tests in acidic environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267396A (en) * | 2018-04-17 | 2018-07-10 | 中国石油工程建设有限公司 | The apparatus and method that evaluation pipe line steel is tested in acidic environment moderate resistance cracking sensitivity |
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- 2018-04-17 CN CN201820541999.4U patent/CN208109662U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267396A (en) * | 2018-04-17 | 2018-07-10 | 中国石油工程建设有限公司 | The apparatus and method that evaluation pipe line steel is tested in acidic environment moderate resistance cracking sensitivity |
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| TR01 | Transfer of patent right |
Effective date of registration: 20210222 Address after: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |