CN109724882A - The experimental rig and method of the minimum section of shear needed for determining gas transmission pipe crack arrest - Google Patents
The experimental rig and method of the minimum section of shear needed for determining gas transmission pipe crack arrest Download PDFInfo
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Abstract
The invention discloses a kind of experimental rigs of the minimum section of shear needed for determining gas transmission pipe crack arrest, comprising: test steel pipe, Blasting with Linear Cumulative Cutting Charge in Rock, test pipe trench, low liquid temperature slot 9 and data collection system；The test steel pipe both ends are welded with plug, test and wrap up thermal insulation material on steel pipe；Blasting with Linear Cumulative Cutting Charge in Rock installation test steel pipe upper surface middle position；Test steel pipe is placed among test pipe trench；Low liquid temperature slot 9 is placed on test pipe trench for giving test steel pipe injection cryogenic liquid；Air compressor is connect for giving test steel pipe pressurization with test steel pipe；Data collection system is mounted on test steel pipe, and data collection system includes timing lines, temperature measuring device, foil gauge and video camera.The test method simple possible provides accurate data source for actual production.
Description
Technical field
The invention belongs to natural-gas transfer pipeline technical field, minimum needed for being related to a kind of determining gas transmission pipe crack arrest is sheared
The test method of area.
Background technique
Natural gas is a kind of clean energy resource, and a kind of inflammable, explosive danger medium, high pressure gas pipeline are once long
Journey cracking will cause calamity huge difficult and loss, it is therefore necessary to guarantee the safety of pipeline.In order to improve the economy of pipeline transportation,
The development trend of natural gas line is high pressure, heavy caliber, big wall thickness, big throughput rate, and the steel pipe of use is also (high-strength to Hi-grade steel therewith
Degree rank) direction develops.China's natural gas line pipe line steel pipe develops very fastly in recent years, and X70 rank steel pipe is in western gas east
Defeated line successful application, the second west to east gas pipeline project pipeline engineering use the steel pipe of X80 rank on a large scale.China is actively ground at present
Send out the engineering application problem of the high-grade pipe line steels such as X90, X100.
Natural-gas transfer pipeline grade of steel, caliber, the raising of design ratio and the use of high pressure rich gas conveying technique, significantly
Operation benefits are improved, while higher requirements are also raised to pipe safety.Gas pipeline manages interior high pressure gas once cracking
It can not empty at once, but respectively generate a decompression wave from breaking point to two sides and propagated to two distal ends.Due to gas decompression
Velocity of wave is lower than crack propagation velocity, the holding high-stress state that crack tip will continue, and crackle can also continue high-speed expansion, hold
Easily lead to the long-range scaling problem of gas pipeline ductility crackle.The section of shear of steel pipe DWTT fracture is judged in high-grade pipe
The crackle of high-speed expansion can crack arrest key technical index.However for Hi-grade steel high tenacity pipe line steel, DWTT sample
Often there is abnormal fracture, not can accurately reflect the fracture apperance in practical full-scale pipeline crack expansion process, it is therefore desirable to send out
A kind of simple and easy Full scale burst experiment technology is opened up, to determine the different service temperatures of Hi-grade steel pipe line steel (X80 or more)
Under the section of shear, and whether being capable of crack arrest.
Summary of the invention
The purpose of the present invention is to provide a kind of experimental rig of the minimum section of shear needed for determining gas transmission pipe crack arrest and
Method, the minimum section of shear needed for Hi-grade steel pipe line steel crack arrest is determined by simulation test.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
The experimental rig of the minimum section of shear needed for a kind of determining gas transmission pipe crack arrest, comprising: test steel pipe, linear shaped
Cutter, test pipe trench, low liquid temperature slot, air compressor/nitrogen supercharging device and data collection system；The test steel
Pipe both ends are welded with plug, test and wrap up thermal insulation material on steel pipe；Among Blasting with Linear Cumulative Cutting Charge in Rock installation test steel pipe upper surface
Position；Test steel pipe is placed among test pipe trench；Low liquid temperature slot is placed on test pipe trench for giving test steel pipe injection
Cryogenic liquid；Air compressor/nitrogen supercharging device is connect for injecting gas to test steel pipe and being pressurized with test steel pipe；Number
According to acquisition system be mounted on test steel pipe on, data collection system include timing lines, temperature measuring device, device for pressure measurement,
Foil gauge and image acquiring device.
As a further improvement of the present invention, the volume of low liquid temperature slot is greater than steel pipe volume, and low liquid temperature slot is opening
Thermal insulation material is wrapped up in the structure type of capping, low liquid temperature slot periphery；Temperature transmitter is provided in low liquid temperature slot to low liquid
Body temperature bath temperature degree is monitored.
As a further improvement of the present invention, Blasting with Linear Cumulative Cutting Charge in Rock is mounted on test steel pipe top center；Linearly
What jet cutter introduced is parallel to steel pipe axial direction through type crackle；Blasting with Linear Cumulative Cutting Charge in Rock is carried out by the way of the detonation of centre
Detonation；The jet stream that Blasting with Linear Cumulative Cutting Charge in Rock generates just cuts through a thickness of steel pipe.
As a further improvement of the present invention, the timing lines is cotton-covered wire, and timing lines is mounted on the upper of test steel pipe
Half quadrant is turned back in the upper half of test steel pipe and is bonded.
As a further improvement of the present invention, the temperature measuring device includes for measuring test steel duct low temperature
First internal temperature sensor of fluid temperature, for measuring the second internal temperature sensor of test steel duct gas temperature
Device, and the patch type surface temperature sensor for measuring the tube wall temperature on steel pipe top crack propagation path.
A kind of test method of the minimum section of shear needed for determining gas transmission pipe crack arrest, comprising the following steps:
1) steel pipe both ends welding plug is tested；
2) test steel pipe is placed among test pipe trench, the straight weld for testing steel pipe is placed in developmental tube ditch bottom；
3) to test penstock installation data collection system；
4) pressure testing test is carried out to test steel pipe using air compressor；
5) thermal insulation material package is carried out to test steel pipe and its auxiliary piping, Blasting with Linear Cumulative Cutting Charge in Rock installation site is reserved to be opened
Mouthful；
6) low liquid temperature slot is placed on test pipe trench；
7) it is initially injected alcohol in low liquid temperature slot, is subsequently injected into liquid nitrogen and carries out temperature adjustment, when liquid in low liquid temperature slot
Temperature stops note nitrogen when being lower than -10 DEG C~-30 DEG C of test temperature, obtain cryogenic fluid；
8) utilize the difference in height of low liquid temperature slot and test steel pipe by mixed cryogenic fluid injection testing steel pipe；
9) after cryogenic liquid injection, Blasting with Linear Cumulative Cutting Charge in Rock is installed in test steel pipe upper surface middle position；
10) dry ice is covered to test steel pipe upper surface, and layer package is thermally shielded to test outer surface of steel tube；
11) practical pipeline military service pressure is pressurized to for steel pipe is tested by air compressor, and kept；
12) by temperature sensor monitor body upper surface temperature, when steel tube surface temperature reach test temperature ± DEG C
When, detonation Blasting with Linear Cumulative Cutting Charge in Rock is for introducing initial crack；
13) test overall process is acquired temperature, pressure, crack velocity and strain data by data collection system；
14) image acquisition is carried out to fracture after testing, and the section of shear is judged；
15) after testing, the relationship of crack velocity and the section of shear is established, judges the minimum section of shear needed for crack arrest.
As a further improvement of the present invention, in step 12), the Initial crack length of introducing should be in 400mm or more.
As a further improvement of the present invention, in step 8), 70%~85% Low Temperature Liquid is injected into test steel pipe first
For body to Control experiment temperature, then step 11) injects the low temperature nitrogen after 15%~30% air/gasification, and is forced into
Test pressure, to provide crack driving force for propagation.
As a further improvement of the present invention, selected around at least in the ductile-brittle transition temperature of test steel pipe in step 12)
Three test temperature points are tested, to the minimum section of shear needed for determining crack arrest.
As a further improvement of the present invention, in step 14), when crack propagation velocity is lower than 100m/s, crackle is determined
Can crack arrest, the corresponding section of shear is the minimum section of shear needed for gas transmission pipe crack arrest at this temperature at this time.
Compared with prior art, the invention has the following advantages that
The experimental rig of the minimum section of shear needed for a kind of determining gas transmission pipe crack arrest of the invention, will be linear by setting
Jet cutter installation test steel pipe upper surface middle position, injects cryogenic liquid and air provides enough driving forces to be imitated
True simulation, and then all data in crack propagation process is obtained by data collection system, to finally obtain under different temperatures
Minimum Percentage of Shear Fracture For Fracture Surface needed for steel pipe crack arrest.The apparatus structure is simple, easy to assembly, can be realized full-scale explosion examination
It tests, the minimum section of shear needed for determining Hi-grade steel pipe line steel crack arrest.
The present invention covers dry ice by injecting liquid nitrogen and alcohol in tube body, in the entire upper surface of steel pipe, and to whole steel
Tube outer surface is thermally shielded layer package to realize control low-temperature test temperature；By in tube body inject 15%~30% air come
It is extended at a distance for crackle and enough driving forces is provided；It is initially split by installing Blasting with Linear Cumulative Cutting Charge in Rock at the top of tube body to introduce
Line；Same cross installs timing lines on tube body to measure crack propagation velocity；Crack propagation is measured by mounting temperature sensor
The temperature of different zones and steel duct on path.The test method simple possible provides accurate data for actual production
Source.
Detailed description of the invention
Experimental provision structural schematic diagram Fig. 1 of the invention；
Steel pipe placement location Fig. 2 of the invention；
Blasting with Linear Cumulative Cutting Charge in Rock position Fig. 3 of the invention；
Timing lines mounting means Fig. 4 of the invention；
Timing lines installation site Fig. 5 of the invention；
Strain rosette installation site Fig. 6 of the invention；
Temperature transmitter installation site Fig. 7 of the invention；
Fig. 8 is one embodiment of the invention X80 steel pipe full-scale experiment comparative result figure.
Wherein, 1- tests steel pipe, 2- straight weld, 3- Blasting with Linear Cumulative Cutting Charge in Rock, 4- timing lines, the first internal temperature sensor of 5-
Device (measurement steel duct gas temperature), the second internal temperature sensor of 6- (measurement steel duct fluid temperature), the surface 7- temperature
Spend sensor, 8-, air compressor/nitrogen pressure device, 9- cryogenic liquid slot, 10- video camera.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
The test method of the minimum section of shear needed for a kind of determining gas transmission pipe crack arrest of the present invention, principle are as follows: by pipe
Liquid nitrogen and alcohol are injected in body, cover dry ice in the entire upper surface of steel pipe, and layer package is thermally shielded to whole outer surface of steel tube
To realize control low-temperature test temperature；Foot is provided by injecting 15%~30% air in tube body to extend at a distance for crackle
Enough driving forces；Initial crack is introduced by installing Blasting with Linear Cumulative Cutting Charge in Rock at the top of tube body；Timing is installed on tube body with crossing
Line measures crack propagation velocity；It is measured by mounting temperature sensor on crack propagation path in different zones and steel pipe
The temperature in portion.
Its Initial crack length introduced should be in 400mm or more.The temperature of gas transmission pipe Full scale burst experiment measures
Device includes interior temperature measurement and surface temperature measurement temperature sensor, and interior temperature measurement sensor is for measuring inside test steel pipe 1
The temperature of cryogenic liquid and the temperature of steel duct gas, outer temperature measurement sensor is for measuring steel pipe top crack propagation road
Tube wall temperature on diameter.
Gas transmission pipe Full scale burst experiment method should inject 70%~85% cryogenic liquid into test steel pipe 1 first
To Control experiment temperature, it is then injected into 15%~30% air/low temperature nitrogen and is forced into test pressure, split to provide
Line external drive power.Dry ice should be covered on the top of test steel pipe 1, to control the temperature of steel pipe wall on crack propagation path
Degree.It should be near the ductile-brittle transition temperature of test steel pipe 1, comprising: ductile-brittle transiton upper mounting plate, ductile brittle transition region, under ductile-brittle transiton
Platform selecting at least three test temperature point is tested, to the minimum section of shear needed for determining crack arrest.Pass through after the test
Explosion bulge test steel pipe 1 and DWTT Percentage of Shear Fracture For Fracture Surface are compared, DWTT Percentage of Shear Fracture For Fracture Surface evaluation method is revised.By right
Than crack propagation velocity and Percentage of Shear Fracture For Fracture Surface, the minimum section of shear needed for crack arrest is determined.
Experiment process is specific as follows:
(1) 1 both ends welding plug of steel pipe is tested, and is carried out non-destructive testing；
(2) test steel pipe 1 is placed among test pipe trench, developmental tube trench depth should be greater than 3m, test 1 straight weld of steel pipe
2 are in 15 ° of positions of steel pipe bottom, as shown in Figure 2；
(3) instrument and meter is carried out to test steel pipe 1, timing lines 4, interior temperature sensor 5 and 6, patch type surface need to be installed
Temperature sensor 7, foil gauge, high-speed camera 10 etc. acquire crack propagation velocity, temperature, strain and image data；
(4) after instrument and meter is installed, pressure testing is carried out to test steel pipe 1 using air compressor, pressure test pressure is to set
The test pressure of meter, pressure maintaining 2 hours, then by pressure pressure release to zero；
(5) thermal insulation material package is carried out to test steel pipe 1 and auxiliary piping after pressure testing, Blasting with Linear Cumulative Cutting Charge in Rock 3 is pacified
The reserved opening of holding position；
(6) low liquid temperature slot 9 is placed on pipe trench, low liquid temperature slot 9 need to be resistant to -70 DEG C of low temperature；
(7) it is initially injected alcohol in low liquid temperature slot 9, is subsequently injected into liquid nitrogen and carries out temperature adjustment, passes through temperature during temperature adjustment
Degree sensor monitors temperature change at any time.Stop when fluid temperature is lower than -10 DEG C~-30 DEG C of test temperature in low liquid temperature slot 9
Only infuse nitrogen；
(8) valve is opened, is injected mixed cryogenic fluid using the difference in height of low liquid temperature slot 9 and test steel pipe 1
Steel pipe 1 is tested, cryogenic liquid volume accounts for the 70%~85% of steel pipe volume；
(9) after cryogenic liquid injection, 3 (cutter of Blasting with Linear Cumulative Cutting Charge in Rock is installed in test 1 upper surface middle position of steel pipe
3 length 400mm, for introducing initial crack)；
(10) after jet cutter 3 is installed, dry ice is covered to the entire upper surface of steel pipe, and to whole steel pipe surface
Face is thermally shielded layer package；
(11) practical pipeline military service pressure is pressurized to for steel pipe 1 is tested by the low temperature nitrogen after air compressor/gasification,
And it keeps；
(12) temperature that body upper surface is monitored by temperature sensor, when steel tube surface temperature reaches test temperature ± 1
When DEG C temperature range, detonate Blasting with Linear Cumulative Cutting Charge in Rock, and Blasting with Linear Cumulative Cutting Charge in Rock is utilized to introduce initial crack；
(13) test overall process is acquired temperature, pressure, crack velocity, strain data by data collection system；
(14) it takes a picture after testing to fracture, and the section of shear is judged.Pass through comparison explosion after the test
Steel pipe 1 and DWTT Percentage of Shear Fracture For Fracture Surface are tested, DWTT Percentage of Shear Fracture For Fracture Surface evaluation method is revised.
(15) crack propagation velocity and Percentage of Shear Fracture For Fracture Surface are compared, thinks crackle when crack propagation velocity is lower than 100m/s
Can be with crack arrest, the corresponding section of shear is the minimum section of shear needed for gas transmission pipe crack arrest at this temperature at this time.
As described in Fig. 1-Fig. 8, the present invention also provides a kind of examinations of the minimum section of shear needed for determining gas transmission pipe crack arrest
Experiment device, comprising: test steel pipe 1, Blasting with Linear Cumulative Cutting Charge in Rock 3, test pipe trench, low liquid temperature slot 9 and data collection system；
1 both ends of test steel pipe are welded with plug, test and wrap up thermal insulation material on steel pipe 1；Blasting with Linear Cumulative Cutting Charge in Rock 3
Installation test 1 upper surface middle position of steel pipe；Test steel pipe 1 is placed among test pipe trench；Low liquid temperature slot 9 is placed in test
For injecting cryogenic liquid to test steel pipe 1 on pipe trench；Air compressor/liquid nitrogen gasification supercharging device is connect with test steel pipe 1
For being pressurized to test steel pipe 1；Data collection system is mounted on test steel pipe 1, and data collection system includes timing lines 4, temperature
Spend measuring device, foil gauge and video camera 10.Wherein, data collection system installation requirement and position are as follows:
(1) low liquid temperature slot 9 and connecting line requirement
1) volume of low liquid temperature slot 9 is about 1.5 times of steel pipe volumes；
2) low liquid temperature slot 9 and auxiliary piping need -70 DEG C of low temperature of tolerance；
3) low liquid temperature slot 9 is the open structure type covered；
4) it needs to wrap up thermal insulation material outside low liquid temperature slot 9；
5) low 9 temperature of liquid temperature slot is monitored by temperature transmitter；
6) low 9 Liftable of liquid temperature slot, can be used for multiple times.
(2) Blasting with Linear Cumulative Cutting Charge in Rock
1) 0 position hookup wire jet cutter among test steel pipe 1, as shown in Figure 3；
2) Blasting with Linear Cumulative Cutting Charge in Rock length is greater than 400mm；
3) what Blasting with Linear Cumulative Cutting Charge in Rock introduced should be parallel to steel pipe axial direction through type crackle；
4) Blasting with Linear Cumulative Cutting Charge in Rock is detonated by the way of the detonation of centre；
5) jet stream that Blasting with Linear Cumulative Cutting Charge in Rock generates should just cut through a thickness of steel pipe
(3) pressure sensor
1) pressure test is carried out using piezoresistive pressure transmitter；
2) 1 pressure transmitter is respectively installed in the air inlet and air outlet position of test steel pipe 1.
(4) timing lines
1) using cotton-covered wire as timing lines,
2) timing lines is mounted on the upper half quadrant of steel pipe, turns back and bonds in the upper half of steel pipe；As shown in figure 4, timing
Line mounting means schematic diagram.
3) calibration line of 3 timing lines as the burst time is installed in steel pipe center (crack starter location) section；Such as Fig. 5 institute
Show, timing lines installation site；
4) remaining position of tube body, distance center line install a timing lines every 0.5m.
(5) strain rosette
It is acquired respectively 0 ° (axial direction) using two strain rosettes, 45 °, the strain in 90 ° of (circumferential direction) three directions.
1) range of strain rosette should be greater than 50000 μ ε；
2) strain rosette installation site, as shown in Figure 6:
Axial position: distance steel tube hub two sides 1m；
Circumferential position: apart from Up Highway UHW 5cm.
(6) temperature transmitter
Temperature measuring device should include interior temperature measurement and surface temperature measurement temperature sensor, interior temperature measurement sensor
For measuring the temperature of test 1 inner cryogenic liquid of steel pipe, outer temperature measurement sensor is for measuring steel pipe top crack propagation road
Tube wall temperature on diameter.
1) as shown in fig. 7, using interior temperature transmitter 2 (▲), patch type surface temperature transmitter 25 () carries out temperature
Degree measurement；
2) warm transmitter is mounted on the circumferential section of steel pipe center line side 10cm in two, and one is installed on distance
The position Up Highway UHW 8cm, another is installed on circumferential 270 ° of positions, as shown in Figure 7.
3) 25 patch type surface temperature transmitters need to be installed altogether and carry out the measurement of steel tube surface temperature.In 13 circumferential sections
Upper mounting surface temperature transmitter (respectively center line side 10cm circumferential direction section；Center line two sides 80cm circumferential direction section；Center
Line two sides 160cm circumferential direction section；Center line two sides 240cm circumferential direction section；Center line two sides 320cm circumferential direction section；Center line two
Side 400cm circumferential direction section；Center line two sides 480cm circumferential direction section)；1 sensing is installed in center line side 10cm circumferential direction section
Device is located at 0 ° of position；2 sensors are installed in remaining section of center line two sides, are located at the 0 ° of position in 0 ° of position and distance
The position of 8cm is set, as shown in Figure 7.
(7) high-speed camera 10
Perpendicular to steel pipe center and it is being parallel to the steel pipe center position 100m one high-speed camera 10 is respectively installed and carry out shadow
As acquisition.
It has been obtained under full-scale gas pipeline difference service temperature through the invention, the fracture apperance of crack propagation, and disconnected
The corresponding relationship of degree of lip-rounding looks and crack propagation velocity, can the Percentage of Shear Fracture For Fracture Surface that measured can be used as determining pipeline crack arrest
Final criterion.
Embodiment
Guan Yan institute combined with certain external company and carried out multiple single tube Full scale burst experiment in October, 2014.Test steel pipe
1 outer diameter is 1219mm, length 12m, wall thickness 18.4mm, test pressure 12MPa.
Pass through the single tube Full scale burst experiment under series of temperatures (- 30 DEG C, -20 DEG C, -10 DEG C), it is determined that steel pipe is in spy
The minimum section of shear needed for determining crack velocity and the crack arrest at temperature.As shown in figure 8, X80 steel pipe full-scale experiment Comparative result
Figure.
Above specific embodiment has carried out further specifically the purpose of the present invention, technical scheme and beneficial effects
It is bright, it should be understood that be not intended to restrict the invention the above is only specific embodiments of the present invention, it is all in the present invention
Spirit and principle within, any modification, equivalent substitution, improvement and etc. done, should be included in protection scope of the present invention it
It is interior.
Claims (10)
1. a kind of experimental rig of the minimum section of shear needed for determining gas transmission pipe crack arrest characterized by comprising test steel pipe
(1), Blasting with Linear Cumulative Cutting Charge in Rock (3), test pipe trench, low liquid temperature slot (9), air compressor/nitrogen supercharging device (8) and data
Acquisition system；Described test steel pipe (1) both ends are welded with plug, wrap up thermal insulation material in test steel pipe (1)；Linear shaped is cut
Cutter (3) installation test steel pipe (1) upper surface middle position；Test steel pipe (1) is placed among test pipe trench；Low liquid temperature slot
(9) it is placed on test pipe trench for giving test steel pipe (1) injection cryogenic liquid；Air compressor/nitrogen supercharging device (8) with
Test steel pipe (1) connection is for giving test steel pipe (1) injection gas and being pressurized；Data collection system is mounted on test steel pipe (1)
On, data collection system includes timing lines (4), temperature measuring device, device for pressure measurement, foil gauge and image acquiring device.
2. the experimental rig of the minimum section of shear needed for determining gas transmission pipe crack arrest according to claim 1, feature exist
In the volume of low liquid temperature slot (9) is greater than steel pipe volume, and low liquid temperature slot (9) is the open structure type covered, low liquid temperature
Wrap up thermal insulation material in slot (9) periphery；Temperature transmitter is provided in low liquid temperature slot (9) to carry out low liquid temperature slot (9) temperature
Monitoring.
3. the experimental rig of the minimum section of shear needed for determining gas transmission pipe crack arrest according to claim 1, feature exist
In Blasting with Linear Cumulative Cutting Charge in Rock (3) is mounted on test steel pipe (1) top center；What Blasting with Linear Cumulative Cutting Charge in Rock (3) introduced runs through
Type crackle is parallel to steel pipe axial direction；Blasting with Linear Cumulative Cutting Charge in Rock (3) is detonated by the way of the detonation of centre；Linear shaped cutting
The jet stream that device (3) generates just cuts through a thickness of steel pipe.
4. the experimental rig of the minimum section of shear needed for determining gas transmission pipe crack arrest according to claim 1, feature exist
In the timing lines (4) is cotton-covered wire, and timing lines (4) is mounted on the upper half quadrant of test steel pipe (1), in test steel pipe
(1) upper half, which turns back, to be bonded.
5. the experimental rig of the minimum section of shear needed for determining gas transmission pipe crack arrest according to claim 1, feature exist
In the temperature measuring device includes passing for measuring first internal temperature of test steel pipe (1) inner cryogenic fluid temperature
Sensor (5) is used to measure second internal temperature sensor (6) of test steel pipe (1) internal air temperature, and for measuring steel pipe
The patch type surface temperature sensor (7) of tube wall temperature on the crack propagation path of top.
6. a kind of test method of the minimum section of shear needed for determining gas transmission pipe crack arrest, which comprises the following steps:
1) steel pipe (1) both ends welding plug is tested；
2) test steel pipe (1) is placed among test pipe trench, the straight weld (2) of test steel pipe (1) is placed in developmental tube ditch bottom；
3) to test steel pipe (1) installation data acquisition system；
4) pressure testing test is carried out to test steel pipe (1) using air compressor；
5) thermal insulation material package is carried out to test steel pipe (1) and its auxiliary piping, Blasting with Linear Cumulative Cutting Charge in Rock (3) installation site is reserved
Opening；
6) low liquid temperature slot (9) is placed on test pipe trench；
7) it is initially injected alcohol in low liquid temperature slot (9), is subsequently injected into liquid nitrogen and carries out temperature adjustment, when liquid in low liquid temperature slot (9)
Temperature stops note nitrogen when being lower than -10 DEG C~-30 DEG C of test temperature, obtain cryogenic fluid；
8) utilize the difference in height of low liquid temperature slot (9) and test steel pipe (1) by mixed cryogenic fluid injection testing steel pipe
(1)；
9) after cryogenic liquid injection, in test steel pipe (1) upper surface middle position installation Blasting with Linear Cumulative Cutting Charge in Rock (3)；
10) dry ice is covered to test steel pipe (1) upper surface, and layer package is thermally shielded to test steel pipe (1) outer surface；
11) steel pipe (1) will be tested by air compressor and is pressurized to practical pipeline military service pressure, and kept；
12) temperature that body upper surface is monitored by temperature sensor, when steel tube surface temperature reaches test temperature ± (1) DEG C
When, detonation Blasting with Linear Cumulative Cutting Charge in Rock (3) is for introducing initial crack；
13) test overall process is acquired temperature, pressure, crack velocity and strain data by data collection system；
14) image acquisition is carried out to fracture after testing, and the section of shear is judged；
15) after testing, the relationship of crack velocity and the section of shear is established, judges the minimum section of shear needed for crack arrest.
7. the test method of the minimum section of shear needed for determining gas transmission pipe crack arrest according to claim 6, feature exist
In in step 12), the Initial crack length of introducing should be in 400mm or more.
8. the test method of the minimum section of shear needed for determining gas transmission pipe crack arrest according to claim 6, feature exist
In in step 8), 70%~85% cryogenic liquid of injection is to Control experiment temperature first into test steel pipe, then step
11) low temperature nitrogen after air/gasification of injection 15%~30%, and it is forced into test pressure, it is driven to provide crack propagation
Power.
9. the test method of the minimum section of shear needed for determining gas transmission pipe crack arrest according to claim 6, feature exist
In, in step 12), test steel pipe (1) ductile-brittle transition temperature at least three test temperatures point selected around tested, use
To determine the minimum section of shear needed for crack arrest.
10. the test method of the minimum section of shear needed for determining gas transmission pipe crack arrest according to claim 6, feature exist
In, in step 14), when crack propagation velocity be lower than 100m/s when, determine crackle can crack arrest, at this time the corresponding section of shear be
The minimum section of shear needed for gas transmission pipe crack arrest at this temperature.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261243A (en) * | 2019-07-10 | 2019-09-20 | 鞍钢股份有限公司 | A kind of assessment method of the pipeline steel block hammer tear test fracture surface of sample section of shear |
| CN110411843A (en) * | 2019-08-02 | 2019-11-05 | 合肥通用机械研究院有限公司 | A kind of pressure vessel or pipe test by air-pressurizing system and test method |
| CN112393969A (en) * | 2020-10-27 | 2021-02-23 | 中国石油天然气集团有限公司 | Axial surface type crack steel pipe explosion test device and fracture resistance evaluation method thereof |
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| CN112393969A (en) * | 2020-10-27 | 2021-02-23 | 中国石油天然气集团有限公司 | Axial surface type crack steel pipe explosion test device and fracture resistance evaluation method thereof |
| CN112393969B (en) * | 2020-10-27 | 2023-01-10 | 中国石油天然气集团有限公司 | Axial surface type crack steel pipe explosion test device and fracture resistance evaluation method thereof |
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