CN105352806B - Pressurizing method of pressurizing device - Google Patents
Pressurizing method of pressurizing device Download PDFInfo
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- CN105352806B CN105352806B CN201510818432.8A CN201510818432A CN105352806B CN 105352806 B CN105352806 B CN 105352806B CN 201510818432 A CN201510818432 A CN 201510818432A CN 105352806 B CN105352806 B CN 105352806B
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- 239000000523 sample Substances 0.000 abstract description 54
- 238000012360 testing method Methods 0.000 abstract description 22
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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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
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Abstract
The invention discloses a pressurizing device, a pipe wall crack propagation speed testing device and a pressurizing and testing method. The pressurizing method adopts a step type interval pause pressurizing flow, and can realize that the pressure in the metal pipe gradually reaches a target value by switching a flexible pressurizing and pressure releasing mode and multi-stage monitoring of the whole process; according to the pipe wall crack propagation speed testing device, the time probe unit is tightly adhered to the metal pipe wall, so that the pipe wall opening and the disconnection of the time probe can be synchronously performed.
Description
Technical field
The present invention relates to pressue device, tube wall crack propagation velocity test device and pressurization and test methods, belong to gas
The technology of liquid high pressure pipeline engineering and security fields.
Background technology
In the process of running, because overpressure variation, pipeline material are tired or impaired, and outside is made in high pressure gas pipeline road
With etc. reasons, cause pipeline somewhere generate tube wall crackle so that occur over long distances extend, not only result in serious financial consequences
And environmental pollution, it will also form ground staff's injures and deaths, building and facility and destroy the catastrophic failures such as impaired.Therefore, it is as possible
Reduce loss, accelerate the repairing process after accident occurs, carries out the crack shape of heavy caliber high pressure metallic conduit extensively both at home and abroad
At and extension mechanical behavior research.Studies have shown that structural crack arrest control is effective control of gas transmission metallic conduit ductile fracture arrest
Method processed, and high-pressure metal pipe explosion bulge test is the important means of research structure crack arrest control.
It is to implement the premise of high-pressure metal appendix air pressure explosion bulge test and important that desired value is forced into gas transmission metal tube
One of link.Crackle extends under high pressure gas effect along tube wall, while breach pressure release also causes decompression wave to be passed in high-voltage tube
It broadcasts.By the crack arrest for testing spread speed, observation crackle of expansion rate and gas decompression wave of the crackle on tube wall in pipe
Position, can comparative analysis determine the arrest toughness of metal tube.Therefore, pressue device and metal tube in the gas metal tube of reasonable design
Crack propagation velocity test method is one of critical issue of Full scale burst experiment.
Invention content
Goal of the invention：In order to overcome the deficiencies in the prior art, a kind of pressue device of present invention offer, tube wall crackle
Pressure in appendix can be pressurized to by expansion rate test device and pressurization and test method by three classes air compression plant
Then desired value carries out tube wall crack propagation velocity test, safe and efficient.
Technical solution：In order to solve the above technical problems, a kind of pressue device of the present invention, including high pressure gas is transported to
High pressure gas delivery pipe, A classes air compression plant, B classes air compression plant and the C class air compression plants of metal tube, it is described
High pressure gas delivery pipe is connected to by one-step valve with metal tube, and the A classes air compression plant is mounted on high pressure gas delivery pipe
On, high pressure gas conveying pipe end is equipped with three-way converter, three-way converter respectively with B classes air compression plant and C classes
Air compression plant connects.
Preferably, the A classes air compression plant includes the first secondary valve, the first crossover sub and the first appendix,
First appendix is connect by the first crossover sub with the first secondary valve, and the first secondary valve is by the first appendix and high pressure gas
Body delivery pipe is connected to.
Preferably, the B classes air compression plant includes the second secondary valve, the second crossover sub and the second appendix,
Second appendix is connect by the second crossover sub with the second secondary valve, and the second secondary valve turns the second appendix and threeway
Parallel operation is connected to.
Preferably, the C classes air compression plant includes third secondary valve, third crossover sub and third appendix,
The third appendix is connect by third crossover sub with third secondary valve, and third secondary valve turns third appendix and threeway
Parallel operation is connected to.
A kind of pressure method of above-mentioned pressue device, includes the following steps：
(1) A classes air compression plant, B classes air compression plant, C classes air compression plant and height are connected as requested
Press air shooter；
(2) use A class air compression plants pressurize, when overpressure be less than or equal to 2MPa when, by 1MPa as step value,
Pause pressurization 15 minutes, repressurization to 2MPa；When overpressure is more than 2MPa, pressurize as step value, pause by 0.5MPa
10 minutes, until being pressurized to 4MPa；
2) B and C class air compression plants are used to pressurize, when overpressure is less than or equal to 8MPa, by 0.5MPa as platform
Rank value, pause pressurization 10 minutes, repressurization to 8MPa；When overpressure is more than 8MPa, by 0.25MPa as step value, temporary
Stop pressurization 10 minutes, until being pressurized to target pressure value.
A kind of tube wall crack propagation velocity test device, including above-mentioned pressue device, the high pressure that is connected to pressue device
Gas transmission metal tube, several time probe units and dynamic signal acquisition system, initial line is equipped in metal tube center tube wall
Type jet cutter, the time probe unit are wrapped on metal tube, each time probe unit and a resistive element string
It is unified into a parallel branch, regulated power supply is powered to each parallel branch, and each channel of dynamic signal acquisition system acquires often respectively
The voltage of resistive element in a parallel branch, dynamic signal acquisition system output are connect with computer.
Preferably, the time probe unit is diameter 0.2mm~0.8mm, length is metal tube outside wall surface perimeter
Enamel covered wire.
Preferably, arrangement spacing of the time probe unit on tube wall is 0.25m~1.0m, time probe unit
Center is located on the tube wall busbar where initial crack, and time probe unit is mounted on metal pipe outer wall for 180 ° around metal tube section
On face, perpendicular to tube wall busbar.
A kind of above-mentioned tube wall crack propagation velocity test method, includes the following steps：
(1) the metal tube outside wall surface at set-up time probe unit is subjected to surface polishing rust-removal with sander, by line style
Jet cutter is mounted on metal tube hub, parallel with metal pipe bus, and time probe unit is twined along tube wall installation site
It around metal tube, is then fixed with 502 glue, then is covered time probe unit with epoxy resin glue, keep it close with tube wall
Pressue device is connected to by adhesion with metal tube；
(2) one end of each time probe unit is connected by the anode of resistive element and regulated power supply, the other end with it is steady
Voltage source cathode connects；Each channel signal input terminal of dynamic signal acquisition system is connect with each resistive element anode respectively, ground connection
End is connect with each resistive element cathode；The data output end of dynamic signal acquisition system is connect with computer；
(3) use A class air compression plants pressurize, when overpressure be less than or equal to 2MPa when, by 1MPa as step value,
Pause pressurization 15 minutes, repressurization to 2MPa；When overpressure is more than 2MPa, pressurize as step value, pause by 0.5MPa
10 minutes, until being pressurized to 4MPa；
(4) B and C class air compression plants are used to pressurize, when overpressure is less than or equal to 8MPa, by 0.5MPa conducts
Step value, pause pressurization 10 minutes, repressurization to 8MPa；When overpressure be more than 8MPa when, by 0.25MPa as step value,
Pause pressurization 10 minutes, until being pressurized to the target pressure value of metal tube；
(5) incipient crack tip location L is set0It is 0, incipient crack position time probe unit forms voltage step signal
Moment t0It is 0；Remaining time probe unit is labeled as L successively since incipient crack1、L2、L3……Li, corresponding calculating
The time that voltage step signal is formed on machine is denoted as t successively1、t2、t3……ti, wherein LiIndicate that i-th of time probe unit arrives
The distance at incipient crack tip, tiTime of the expression crack propagation to i-th of time probe unit；Then crackle passes through adjacent time
The average speed V of probe uniti=(Li-Li-1)/(ti-ti-1), the n of wherein i=1,2,3 ...；Then with displacement [(Li-Li-1)/
2+Li] it is X-axis and speed ViDistance-rate curve is drawn for Y-axis, you can corresponding when obtaining crack propagation to corresponding position
Crack propagation overall travel speed.
In the present invention, time probe unit, resistive element and regulated power supply are connected into closed circuit, is believed using dynamic
The voltage of number acquisition system acquisition resistive element, voltage step signal is formed using the change of time probe unit on off operating mode,
To obtain the arrival time of crack tip, the time difference generated by two step signals obtains crack propagation overall travel speed indirectly.
In the present invention, consider the factors such as mechanics, the electric property of material, select a diameter of 0.2mm~0.8mm
Enamel covered wire as time probe unit, make its existing certain dynamic tensile strength, to bear blasting impact load action, again
Disconnection can be synchronized with splitting for tube wall；The length of time probe unit (timeline) should be equal to the perimeter of metal tube outside wall surface,
To ensure reliably to obtain break signal, while convenient for the connection and the protection of itself with test device.According to high pressure high tenacity gold
Belong to pipe crack propagation characteristic, metal pipe crack is axially expanded since initial crack both ends along metal tube when experiment, when reaching only
When splitting condition, propagation direction can deflect.Accurately to test the expansion rate in metal pipe crack each stage, time probe unit
Center should be on the tube wall busbar where initial crack, and symmetrical centre point is mounted on outside metal tube for 180 ° around metal tube section
On wall surface, perpendicular to tube wall busbar.It is 100m/s~350m/s to estimate spread speed due to high pressure high-toughness metal pipe crack, is
It is accurately captured the variation of crack velocity, the interval of time probe unit arrangement preferably takes 0.25m~1.0m.
In the present invention, tube body air admission hole is arranged at the top of metal tube tube body, apart from 1.8 meters of end, using A class air pressures
Compression apparatus pressurizes, and high-pressure delivery pipe is threadedly coupled mode and connected with corresponding secondary valve, and by one-step valve by high pressure
In gas transport to pipe.When overpressure is less than or equal to 2MPa, by 1MPa as step value, pause pressurization 15 minutes, then add
It is depressed into 2MPa；Interval approaches inspection, checks the modes such as air compression plant pressure indicator, checks test metal tube tube body
And the sealing situation of test cell installation position, welding position.When overpressure is more than 2MPa, by 0.5MPa as step
Value, pause pressurization 10 minutes, until being pressurized to 4MPa；Interval seals situation using the same manner inspection.
After overpressure reaches 4MPa, the corresponding secondary valve of A class air compression plants is closed；It is compressed using B and C class air
Device pressurizes.When overpressure is less than or equal to 8MPa, by 0.5MPa as step value, pause pressurization 10 minutes, repressurization is extremely
8MPa；When overpressure is more than 8MPa, by 0.25MPa as step value, pause pressurization 10 minutes, until being pressurized to
12MPa closes one-step valve at this time, waits to be tested.Interval air compression plant pressure indicator, monitoring remote video and
The multiple means such as the real-time transmission data monitoring of different location pressure sensor, supervise the state of compression system each unit
Control.
Advantageous effect：The pressure method of the present invention, the step interval dwell pressurization flow of use, and conversion are flexible
The monitoring of more means of pressurization pressure release mode and overall process reaches desired value, method peace, it can be achieved that the overpressure of metal tube is progressive
Entirely, reliably, test requirements document can be met；The tube wall crack propagation velocity test device of the metal tube pressure explosion bulge test of the present invention,
Time probe unit and metal pipe-wall close adhesion, it can be ensured that tube wall opens progress synchronous with the disconnection of time probe, improves examination
Test the accuracy of data；The test method of the present invention, voltage step signal is presented by using break signal on resistance, is tested
Method safety is reliable.
Description of the drawings
Fig. 1 is the compression system detailed construction schematic diagram of the present invention.
Fig. 2 is the compression system composition schematic diagram of the present invention.
Fig. 3 is test device connection diagram of the present invention.
Fig. 4 is the circuit design schematic diagram of Fig. 3 of the present invention.
Fig. 5 is time probe unit schematic view of the mounting position of the invention.
Fig. 6 is time probe unit clipping room of the invention away from schematic diagram.
Fig. 7 is display waveform figure in the dynamic signal acquisition system of the present invention.
Fig. 8 is crack velocity-distance Curve figure of the present invention.
Specific implementation mode
As depicted in figs. 1 and 2, a kind of pressue device of the invention includes the high pressure that high pressure gas is transported to metal tube 1
Air shooter, A classes air compression plant 21, B classes air compression plant 22 and C classes air compression plant 23, the high pressure gas
Body delivery pipe is connected to by one-step valve 19 with metal tube 1, and the A classes air compression plant 21 is mounted on high pressure gas delivery pipe
On, high pressure gas conveying pipe end is equipped with three-way converter 12, three-way converter 12 respectively with B classes air compression plant 22
It is connected with C classes air compression plant 23.Wherein, A classes air compression plant 21 includes the first secondary valve 11, the first crossover sub 17
With the first appendix 18, first appendix 18 is connect by the first crossover sub 17 with the first secondary valve 11, the first two level
First appendix 18 is connected to by valve 11 with high pressure gas delivery pipe.The B classes air compression plant 22 includes the second secondary valve, the
Two crossover subs 13 and the second appendix 14, second appendix 14 are connected by the second crossover sub 13 and the second secondary valve
It connects, the second appendix 14 is connected to by the second secondary valve with three-way converter 12.The C classes air compression plant 23 includes third
Secondary valve, third crossover sub 15 and third appendix 16, the third appendix 16 pass through third crossover sub 15 and third
Secondary valve connects, and third appendix 16 is connected to by third secondary valve with three-way converter 12.
As shown in Figures 3 to 6, a kind of tube wall crack propagation velocity test device, including above-mentioned pressue device and pressurization
High pressure gas transmission metal tube 1, several time probe units 2 and the dynamic signal acquisition system 5 of device connection, in metal tube 1
Linear cavity effect cutter 7 is installed, the time probe unit 2 is wrapped on metal tube 1, each time probe on heart tube wall
Unit 2 and a resistive element 4 are connected into a parallel branch, and regulated power supply 8 is powered to each parallel branch, and Dynamic Signal is adopted
5 each channel of collecting system acquires the voltage of resistive element 4 in each parallel branch respectively, 5 output end of dynamic signal acquisition system with
Computer 6 connects.
In the present invention, carry out air pressure explosion bulge test for X90 metal tubes, experiment 1 outer diameter of metal tube is 1219mm, wall thickness
For 16.3mm, length 10.4m, yield strength 670MPa, Charpy impact energy be 294J, internal pressure 12Mpa.
Test procedure is as follows：
Step 1：Time probe unit 2 selects.Time probe unit 2 selects the enamel covered wire of diameter 0.4mm；Its length
3.8m is taken to be approximately equal to the perimeter of 1 outside wall surface of metal tube.
Step 2：2 installation position of time probe unit and spacing.As shown in Figure 1,2 center of time probe unit is located at just
On tube wall busbar where beginning crackle 3, time probe unit 2 is mounted in 1 outside wall surface of metal tube for 180 ° around 1 section of metal tube,
Perpendicular to tube wall busbar, as shown in Figure 3.Crack propagation velocity of the metal tube 1 in crack initiation and crack arrest position is smaller, is captured to be accurate
To the variation of crack velocity, the arrangement spacing of crack initiation and crack arrest position time probe unit 2 takes 0.25m；Remaining position of metal tube 1
The arrangement spacing for setting time probe unit 2 takes 0.5m.
Step 3：Test device is installed and is connect.Time probe unit 2 is installed and connect and need to carry out in the following order：
1) polishing derusting.1 outside wall surface of metal tube at set-up time probe unit 2 surface polishing is carried out with sander to remove
Rust.
2) it cleans.The tube wall surface polished is handled with alcohol and gauze.
3) it installs.By time probe unit 2 along tube wall installation site wrapping metal tube 1, then fixed with 502 glue, then use
Epoxy resin glue covers time probe unit 2, makes itself and tube wall close adhesion.To ensure sticking strength, epoxy resin
The width of glue covering is 1.5m, and thickness is not less than 3mm.
4) connection of time probe unit 2.As shown in Figure 1, the ends a of each time probe unit 2 pass through resistance member respectively
Part 4 (100 Ω) is connect with regulated power supply 8 (2V) anode, and the ends b are connect with 8 cathode of regulated power supply；Dynamic signal acquisition system 5 is each
Channel signal input terminal is connect with 4 anode of each resistive element respectively, and ground terminal is connect with 2 cathode of each resistive element；Dynamic Signal
The data output end of acquisition system 5 is connect with computer 6, and pressue device is connected to metal tube.
Step 4：It is pressurizeed using A class air compression plants, when overpressure is less than or equal to 2MPa, by 1MPa as platform
Rank value, pause pressurization 15 minutes, until being forced into 2MPa；When overpressure be more than 2MPa when, by 0.5MPa as step value,
Pause pressurization 10 minutes, until being pressurized to 4MPa；
Step 5：It is pressurizeed using B and C class air compression plants, when overpressure is less than or equal to 8MPa, by 0.5MPa
As step value, pause pressurization 10 minutes, repressurization to 8MPa；When overpressure is more than 8MPa, by 0.25MPa as step
Value, pause pressurization 10 minutes, until being pressurized to the target pressure value of metal tube；
Step 6：The measurement of crack velocity.Open dynamic signal acquisition system 5 and computer 6；Detonate line style cumulative blasting
Device 7 introduces incipient crack 3 in 1 geometric center of metal tube；Crackle is opened under high pressure gas effect from 3 both ends of incipient crack
Begin along the axial straight line extension of metal tube 1, and cuts off the time probe unit 2 on metal tube 1, each time probe unit 2 successively
Break signal transmit through signal cable and acquired by dynamic signal acquiring system 5, a voltage step signal is presented.
Step 7：The acquisition of crackle overall travel speed.If 3 tip location L of incipient crack0It is 0, the 3 position time of incipient crack
T at the time of probe unit 2 forms voltage step signal0It is 0；Remaining time probe unit 2 marks successively since incipient crack 3
For L1、L2、L3……Li, the time that voltage step signal is formed on corresponding computer 6 is denoted as t successively1、t2、t3……
ti, wherein LiIndicate i-th of time probe unit 2 to the distance at 3 tip of incipient crack, tiIndicate crack propagation to i-th of time
The time of probe unit 2；Then crackle passes through the average speed V of adjacent time probe unit 2i=(Li-Li-1)/(ti-ti-1),
The n of middle i=1,2,3 ...；Then with displacement [(Li-Li-1)/2+Li] it is X-axis and speed ViDistance-rate curve is drawn for Y-axis,
Corresponding crack propagation overall travel speed when can be obtained crack propagation to corresponding position, as shown in Figure 8.
Implementation result：As shown in fig. 7, before time probe unit 2 is broken, 4 both ends output voltage of corresponding resistive element is
1.8V；When crack cut time probe unit 2,4 both ends output voltage of corresponding resistive element changes, rapid from 1.8V
Drop to 0.15V, a step signal is presented in computer 6, two step signals formation time differences are crackle process pair
The time for the two time probe units 2 answered.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (1)
1. a kind of pressure method of pressue device, the pressue device include high pressure gas is transported to metal tube high pressure gas it is defeated
Pipe, A classes air compression plant, B classes air compression plant and C class air compression plants, the high pressure gas delivery pipe is sent to pass through
One-step valve is connected to metal tube, and the A classes air compression plant is mounted in high pressure gas delivery pipe, the high pressure gas conveying
Pipe end is equipped with three-way converter, and three-way converter is connect with B classes air compression plant and C class air compression plants respectively；Institute
It includes the first secondary valve, the first crossover sub and the first appendix to state A class air compression plants, and first appendix passes through the
One crossover sub is connect with the first secondary valve, and the first appendix is connected to by the first secondary valve with high pressure gas delivery pipe；The B classes
Air compression plant includes the second secondary valve, the second crossover sub and the second appendix, and second appendix passes through second turn
Changing-over head is connect with the second secondary valve, and the second appendix is connected to by the second secondary valve with three-way converter；The C classes air compression
Device includes third secondary valve, third crossover sub and third appendix, the third appendix by third crossover sub with
Third secondary valve connects, and third appendix is connected to by third secondary valve with three-way converter, which is characterized in that including following step
Suddenly：
（1）A classes air compression plant, B classes air compression plant, C classes air compression plant and high pressure gas are connected as requested
Body delivery pipe；
（2）It is pressurizeed using A class air compression plants, when overpressure is less than or equal to 2MPa, by 1MPa as step value, pause
Pressurization 15 minutes, repressurization to 2MPa；When overpressure is more than 2MPa, by 0.5MPa as step value, 10 points of pause pressurization
Clock, until being pressurized to 4MPa；
（3）It is pressurizeed using B and C class air compression plants, when overpressure is less than or equal to 8MPa, by 0.5MPa as step
Value, pause pressurization 10 minutes, repressurization to 8MPa；When overpressure is more than 8MPa, by 0.25MPa as step value, pause
Pressurization 10 minutes, until being pressurized to target pressure value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510818432.8A CN105352806B (en) | 2015-11-23 | 2015-11-23 | Pressurizing method of pressurizing device |
| CN201810442083.8A CN108871963B (en) | 2015-11-23 | 2015-11-23 | Testing method of pipe wall crack propagation speed testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510818432.8A CN105352806B (en) | 2015-11-23 | 2015-11-23 | Pressurizing method of pressurizing device |
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| CN201810442083.8A Division CN108871963B (en) | 2015-11-23 | 2015-11-23 | Testing method of pipe wall crack propagation speed testing device |
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| CN201510818432.8A Expired - Fee Related CN105352806B (en) | 2015-11-23 | 2015-11-23 | Pressurizing method of pressurizing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105510157A (en) * | 2015-12-30 | 2016-04-20 | 中国石油天然气集团公司 | Measuring device for fracture speed of whole-size gas bursting test of gas conveying steel pipe |
| CN108469383B (en) * | 2018-04-12 | 2020-09-11 | 瑞瑶环境科技有限公司 | Plastic inspection well quality detection device |
| CN109724882A (en) * | 2018-11-15 | 2019-05-07 | 中国石油天然气集团有限公司 | The experimental rig and method of the minimum section of shear needed for determining gas transmission pipe crack arrest |
| CN113190789B (en) * | 2021-04-29 | 2024-04-09 | 中国石油天然气集团有限公司 | Gas pipeline crack propagation speed calculation method |
| CN115046872B (en) * | 2022-08-09 | 2022-11-15 | 南通泰胜蓝岛海洋工程有限公司 | Fatigue crack real-time measuring method |
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| Publication number | Publication date |
|---|---|
| CN108871963B (en) | 2020-06-30 |
| CN105352806A (en) | 2016-02-24 |
| CN108871963A (en) | 2018-11-23 |
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