CN104330311A - Device and method for detecting pressure pipeline - Google Patents
Device and method for detecting pressure pipeline Download PDFInfo
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- CN104330311A CN104330311A CN201410654329.XA CN201410654329A CN104330311A CN 104330311 A CN104330311 A CN 104330311A CN 201410654329 A CN201410654329 A CN 201410654329A CN 104330311 A CN104330311 A CN 104330311A
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Abstract
The invention relates to a device and a method for detecting a pressure pipeline. The device comprises a pipeline system and a detection control system, wherein the pipeline system is provided with a water storage tank, a multistage centrifugal pump, a one-way valve, two electromagnetic valves, a pressure control valve and a hand-operated pressure valve, all of which are connected together by use of pipelines; the two electromagnetic valves are connected with the tested pipeline; the detection control system is provided with a direct-current stabilized voltage power source, a 24V direct-current power source, a pressure sensor, an operating panel, a control mainboard and a monitor, all of which are connected together by use of cables. The method comprises the following steps: designing simulation parameters by virtue of working condition simulation on the working conditions and the characteristics of the tested pressure pipeline and then performing a fatigue test under the circumstance of cyclic loading of a pulse high voltage so as to obtain quite accurate quantitative determination data of the durability and the reliability of the pressure pipeline, and processing the data by use of a computer to obtain the expected service life of the tested pipeline under other working conditions. The device and the method for detecting the pressure pipeline can be applied to detecting the pressure pipelines such as a tap water pipeline and petroleum and natural gas pipelines.
Description
Technical field
The present invention relates to a kind of pressure pipeline pick-up unit and detection method, specifically relate to a kind of pipeline to using in certain pressure condition and environment, using state as tap water, petroleum and natural gas pipeline carries out the method for device and the detection detected, be applicable to the detection to pipelines such as PVC, PE, metal materials, by being detected as Design of Pressure Piping and providing a kind of detection method and Appreciation gist of science serviceable life.
Background technology
The pipelines such as potable water infrastructure and petroleum and natural gas have vital role in the development of the national economy with in developing, if the disaster caused due to damage or the explosion of these pipelines or disaster very large to social influence.Except service disruption, people's life and property even may be caused to bring about great losses.But due to the difference of manufacturer and production technology, the difference in serviceable life of a lot of pressure pipeline is very large, even if the pipeline of identical material has very large difference serviceable life because the difference of production technology also can cause.At present, detection method during China uses pressure pipeline, point polytype, having and detect for metallic conduit, is generally adopt carrying out flaw detection, ultrasonic guided wave detecting, to the damage of pipeline, leaks and carries out leakage loss monitoring; Also the detection to chemical property, mechanical property is had.But the measurement for the serviceable life of pressure pipeline does not then have pick-up unit and the detection method of corresponding authority, do not have the testing result of energy quantification, detection is qualitatively then relatively simple, generally only sees the highest bearing capacity of single.In conduit running process, also often adopt qualitative checking method, such as check the integrality of pipeline, destructiveness of corrosivity or coating etc.The pipeline situation caused due to the impact of mechanical property in motion process is not quantitatively detected, therefore need to solve China at present to the problem of pressure pipeline without quantitative testing device and detection method.Especially quantitative evaluation is carried out to the life-span reduction that pipeline operation under specific circumstances causes due to fatigure failure, accomplish accident prevention in advance, reduce Socie-economic loss significant.
Summary of the invention
The object of the invention is at present pressure pipeline, as PVC, PE, the tap water of metal material, serviceable life of petroleum and natural gas equal pressure pipeline cannot carry out by specific pick-up unit and detection method quantitative data the problem assessed, and a kind of pressure pipeline pick-up unit and detection method are provided, can according to the condition of work to tested pressure pipeline, feature carries out Work condition analogue, design analog parameter and carry out testing fatigue in high voltage pulse CYCLIC LOADING situation, thus obtain the permanance of more accurate pressure pipeline and the quantitative detection data of reliability, the serviceable life of the tested pipeline of budget under its condition of work is drawn as calculated after machine process, for assessment of the serviceable life of tested pressure pipeline, for the design of this kind of pipeline and use provide scientific basis.
To achieve these goals, the technical measures that the present invention takes are: provide a kind of pressure pipeline pick-up unit, comprise piping system and detecting and controlling system, described piping system is provided with the catch basin connected by pipeline, multistage centrifugal pump, retaining valve, solenoid valve A, B, pressure control valve and Manual pressure valve, solenoid valve A, B are connected with tested pipeline respectively; Wherein the volume of catch basin and the height of installation decide according to the volume of tested pipeline; Pipeline employing diameter in described piping system is high-pressure rubber pipe or the metal tube of 25 ~ 50mm, described catch basin is for storing water, stored water executes stressed medium as to tested pipeline, catch basin top is provided with three backwater entrances, catch basin bottom is provided with water delivering orifice, water delivering orifice passes through the pipeline connection position retaining valve lower than reservoir bases position, retaining valve rear end connects multistage centrifugal pump, described multistage centrifugal pump is by three-way pipe Bonding pressure operation valve and solenoid valve A, and pressure control valve is connected with Manual pressure valve; Solenoid valve B, pressure control valve, Manual pressure valve are connected with three backwater entrances of catch basin respectively;
Described detecting and controlling system is provided with the D.C. regulated power supply, 24V direct supply, pressure transducer, guidance panel, control mainboard and the monitor that are connected by cable, D.C. regulated power supply in described detecting and controlling system converts alternating current to direct current, for pressure transducer provides direct supply, described 24V direct supply provides power supply for solenoid valve A, B; Described control mainboard is electrically connected with guidance panel, monitor, pressure transducer and two solenoid valves respectively, controls and realize the program that two solenoid valves perform setting to open and close automatically by controlling mainboard, and realize control detection system and carry out data acquisition and preservation; By carrying out cycle pulse pressure detection repeatedly, automatically being sent by guidance panel when pressure anomaly appears in tested pipeline and reporting to the police and detection of end work.
Described retaining valve enters multistage centrifugal pump for controlling current, in plant maintenance process, close described retaining valve; Described Manual pressure valve is for arranging the original pressure of tested pipeline, and namely in the forward direction tested pipeline detecting beginning, water-filling also keeps the original pressure of setting.
The horsepower of described multistage centrifugal pump is selected according to the volume of tested pipeline and bearing capacity, and the head height of pump and the loss of flood peak calculate according to the diameter of connecting tube and the highest pressure design of bearing of tested pipeline; In pick-up unit, two solenoid valve pressure of piping system and connection are according to the working pressure designing and calculating of tested pipeline.
The present invention also provides a kind of method using above-mentioned pressure pipeline pick-up unit to carry out pipe detection, operates as follows:
, detect before, be connected with solenoid valve A tested pipeline one end, the other end is connected with solenoid valve B, and tested pipeline is also provided with pressure transducer; Start and control mainboard and guidance panel, and setting comprises solenoid valve A, B applying pulse temporal width, pressure parameter on guidance panel, the working pressure parameter of Manual pressure valve and pressure control valve; Then manually pressure valve is full of water to tested pipeline and keeps initialization pressure;
(2), when detecting beginning, under the control controlling mainboard and guidance panel, pressure control valve, Manual pressure valve and solenoid valve B close automatically, solenoid valve A applies pulse test pressure to tested pipeline water-filling under the pressure effect of water, within the time pulsewidth of setting, make the pressure of tested pipeline reach rated operating pressure, solenoid valve A closes automatically, automatically open when the pressure of solenoid valve B then in tested pipeline has exceeded the set pressure of solenoid valve B and pressure release, after the time pulsewidth of setting, tested pipeline pressure recover is to initial setting up pressure, solenoid valve B closes automatically, pressure transducer gathers the data of whole pulse test, and sends the preservation of control mainboard and process to,
(3), when solenoid valve A closes, multistage centrifugal pump works on, and pipeline pressure in solenoid valve A front end increases, and when pressure increase is to the setting working pressure of pressure control valve, pressure control valve is automatically opened and current are back to catch basin;
(4), pick-up unit follow procedure automatically again repetitive cycling step (2), (3), carry out water-filling and apply pulse and detect next time; In testing process each time, pressure transducer constantly carries out pressure data collection automatically, and constantly data is delivered to control mainboard, controls mainboard and preserves and process the coherent detection time and data message that gather, and show on a monitor;
(5), after pick-up unit carries out the detection of several pulse, when finally detecting that tested pipeline working pressure occurs abnormal, automatically sent by guidance panel and report to the police and detection of end work;
(6), according to the number of times of the pressure pulse test carried out tested pipeline, machine process draws the serviceable life of the tested pipeline of budget under its condition of work as calculated.
The described time pulsewidth set solenoid valve A is 2 ~ 6 seconds, the time pulsewidth set solenoid valve B is 4 ~ 8 seconds, namely solenoid valve A opens in 2 ~ 6 seconds that pressure in rear tested pipeline opens at solenoid valve A and reaches rated operating pressure instantaneously, solenoid valve A automatically closes after the pulse width time of setting, because solenoid valve A closes, pressure in tested pipeline exceedes the pressure of solenoid valve B setting and magnet valve B is opened, get back to normal pressure with regard to pressure release after 4 ~ 8 seconds that pressure in tested pipeline is opened at solenoid valve B, solenoid valve B closes automatically.
The simulation that the detection method of apparatus of the present invention is conditions of work according to pressure pipeline, work characteristics carries out practical working situation, under the testing conditions of setting, simulated pressure pipeline condition of work, to the parameter needing the pipe design detected to carry out pressure pulse test, in high voltage pulse CYCLIC LOADING situation, carry out testing fatigue.Test result will with manufacturing standard, the pipe design information of the especially pressure rating of pipeline, and these materials compares.Determine that the pipeline of diameter is under the effect of cycle of higher pressure load by testing fatigue by making, operating ratio design service life extends the frequency of operation of 1.5 times, the ability until pipeline is lost the job, and can draw the serviceable life of pipeline.
The method of pressure pipeline pick-up unit of the present invention and detection compared with prior art tool has the following advantages:
1. pressure pipeline structure of the detecting device of the present invention is simple, and assembly of devices is originally lower, and functional reliability is good.
2. the method for detection of the present invention, easy and simple to handle, accuracy of detection is high, automatically can carry out pressure pulse test to pressure pipeline down imposing a condition, thus obtain the permanance of more accurate pressure pipeline and the quantitative detection data of reliability, calculate the serviceable life of tested pressure pipeline in advance, for assessment of the serviceable life of tested pressure pipeline, for the design of this kind of pipeline and use provide scientific basis, have operating pressure pipeline stability and evolution simultaneously and hold preferably, accomplishing to prevent accident in advance, playing a significant role for reducing Socie-economic loss.
Accompanying drawing explanation
Fig. 1 is the structural representation of pressure pipeline pick-up unit.
In figure: 1-catch basin, 2-retaining valve, 3-multistage centrifugal pump, 4-solenoid valve A, 5-solenoid valve B, 6-pressure control valve, 7-Manual pressure valve, 8-pipeline, 9-24V direct supply, 10-pipe under test, 11-cable, 12-pressure transducer, 13-D.C. regulated power supply, 14-alternating current, 15-guidance panel, 16-control mainboard, 17-monitor.
Wherein: solenoid valve A4 is tested pipeline water inlet solenoid valve, solenoid valve B5 is tested pipeline water outlet solenoid valve, pressure control valve 6 is reduction surge return pressure operation valve.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but enforcement of the present invention is not limited thereto.
Embodiment 1: the invention provides a kind of pressure pipeline pick-up unit, its structure as shown in Figure 1.Pick-up unit comprises piping system and detecting and controlling system, and described piping system is provided with the catch basin 1 connected by pipeline 8, multistage centrifugal pump 3, retaining valve 2, solenoid valve A, B, pressure control valve 6 and Manual pressure valve 7, wherein solenoid valve A, B is connected with tested pipeline two ends respectively.
Pipeline 8 in described piping system adopts diameter to be the high-pressure rubber pipe of 25mm, described catch basin 1 is for storing water, stored water executes stressed medium as to tested pipeline 10, the volume of catch basin is through calculating, value is 2 times of detected piping volume, and the height of installation is higher than 2.5 meters, detected pipeline; Catch basin 1 top is provided with three backwater entrances, catch basin bottom sets out the mouth of a river, water delivering orifice is by the retaining valve 2 of lower than reservoir bases 2 meters of pipeline 8 connection, retaining valve rear end connects multistage centrifugal pump 3, described multistage centrifugal pump 3 is by three-way pipe Bonding pressure operation valve 6 and solenoid valve A4, and pressure control valve 6 is connected with Manual pressure valve 7; Solenoid valve B5, pressure control valve 6, Manual pressure valve 7 are connected with three backwater entrances of catch basin 1 respectively.
Described detecting and controlling system is provided with the D.C. regulated power supply 13,24V direct supply 9, pressure transducer 12, guidance panel 15, control mainboard 16 and the monitor 17 that are connected by cable 11.Alternating current 14 is converted to the direct current of voltage stabilizing by the D.C. regulated power supply 13 in described detecting and controlling system, and for pressure transducer 12 provides direct supply, described 24V direct supply 9 is solenoid valve A4, solenoid valve B5 provides power supply; Described control mainboard 16 is electrically connected with guidance panel 15, monitor 17, pressure transducer 12 and solenoid valve A, B respectively, realize the program that two solenoid valves perform setting open and close automatically by controlling mainboard 16 by the programmed control of setting, and realize controlling detection system and carry out data acquisition and preservation; Detected by the pulse repeatedly circulated, automatically sent by guidance panel 15 when pressure anomaly appears in tested pipeline and report to the police and detection of end work.
Described retaining valve 2 enters multistage centrifugal pump 3 for controlling current, closes described retaining valve 2 in plant maintenance process; Described Manual pressure valve 7 is for arranging the original pressure of tested pipeline 10, and namely in the forward direction tested pipeline detecting beginning, water-filling also keeps the original pressure of setting.
The horsepower of described multistage centrifugal pump 3 is selected according to the volume of tested pipeline and bearing capacity, and the head height of pump and the loss of flood peak calculate according to the diameter of connecting tube and the highest pressure design of bearing of tested pipeline; In pick-up unit, two solenoid valve pressure of piping system and connection are according to the working pressure designing and calculating of tested pipeline.
Use the pressure pipeline pick-up unit that the present invention is above-mentioned, pressure pipeline carried out to the method for pipe detection, operate as follows:
, detect before, be connected with solenoid valve A4 tested pipeline 10 one end, the other end is connected with solenoid valve B5, and tested pipeline is also provided with pressure transducer 12; Start and control mainboard 16 and guidance panel 15, and on guidance panel, set the working pressure parameter of solenoid valve A4, solenoid valve B5, Manual pressure valve 7 and pressure control valve 6; Comprising setting solenoid valve A4 opening time pulse is 3 seconds, and solenoid valve B5 opening time pulse is the parameters such as 4 seconds, and then by calculating initial pressure value, manually pressure valve 7 is full of water to tested pipeline 10 and keeps initialization force value.
(2), when detecting beginning, under the control controlling mainboard 16 and guidance panel 15, pressure control valve 6, Manual pressure valve 7 and solenoid valve B5 close automatically, solenoid valve A4 is tested pipeline water inlet solenoid valve, control mainboard 16 Controlling solenoid valve A4 open to tested pipeline water-filling under the pressure effect of water and apply pulse test pressure, within 3 seconds pulse width time of setting, make the pressure of tested pipeline 10 reach rated operating pressure, solenoid valve A4 closes automatically, solenoid valve B5 is tested pipeline water outlet solenoid valve, automatically open when pressure then in tested pipeline has exceeded the set pressure of solenoid valve B5 and pressure release, after 4 seconds pulse width time of setting, tested pipeline 10 pressure recover is to initial setting up pressure, solenoid valve B5 closes automatically, pressure transducer 12 gather whole pulse test data, and send to control mainboard 16 preserve and process.
(3), when solenoid valve A4 closes, multistage centrifugal pump 3 works on, pipeline pressure in solenoid valve A4 front end increases, pressure control valve 6 is for reducing surge return pressure operation valve, when pressure increase is to the setting working pressure of pressure control valve 6, pressure control valve 6 is automatically opened and current is back to catch basin 1.
(4), pick-up unit under program control automatically again repetitive cycling step (2), (3), carry out water-filling and apply pulse and detect next time.In testing process each time, pressure transducer 12 constantly carries out pressure data collection automatically, and constantly data is delivered to and control mainboard 16, controls mainboard and preserves and process the correlation time and data message that gather, and can show on monitor 17.
(5), after pick-up unit carries out the detection of several pulse, when finally detecting that tested pipeline working pressure occurs abnormal, automatically sent by guidance panel 15 and report to the police and detection of end work.
(6) the number of times, according to the more accurate pressure pulse carried out tested pipeline tested, quantitatively can draw condition of work and the mission life of tested pipeline.
Embodiment 2: the invention provides a kind of pressure pipeline pick-up unit, its structure as shown in Figure 1.Unlike due to the diameter of tested pipeline 10 larger, the high pressure resistant metal tube that the pipeline 8 used in piping system adopts diameter to be 50mm, the volume of catch basin 1 is comparatively large, and volume is through calculating, value is 3 times of detected piping volume, and the height installed is 3 meters; The retaining valve 2 of the water outlet end connection of catch basin is arranged on the position of lower than the bottom of catch basin 2.5 meters.The time pulsewidth that the time pulsewidth that solenoid valve A4 described in when detecting sets is 6 seconds, solenoid valve B5 sets is 8 seconds.
Pick-up unit other structure and detection method with embodiment 1.Here repeat no more.
Pressure pipeline pick-up unit of the present invention and detection method can be used for the tap water, the oil and natural gas equal pressure pipeline that detect the materials such as PVC, PE, metal, by detecting for assessment of serviceable life of tested pressure pipeline, for the design of this kind of pipeline and use provide the foundation of science.
Claims (5)
1. a pressure pipeline pick-up unit, comprises piping system and detecting and controlling system, and described piping system is provided with the catch basin connected by pipeline, multistage centrifugal pump, retaining valve, solenoid valve A, B, pressure control valve and Manual pressure valve, solenoid valve A, B are connected with tested pipeline respectively; Wherein the volume of catch basin and the height of installation decide according to the volume of tested pipeline; It is characterized in that: the pipeline employing diameter in described piping system is high-pressure rubber pipe or the metal tube of 25 ~ 50mm, described catch basin is for storing water, stored water executes stressed medium as to tested pipeline, catch basin top is provided with three backwater entrances, catch basin bottom is provided with water delivering orifice, water delivering orifice passes through the pipeline connection position retaining valve lower than reservoir bases position, retaining valve rear end connects multistage centrifugal pump, described multistage centrifugal pump is by three-way pipe Bonding pressure operation valve and solenoid valve A, and pressure control valve is connected with Manual pressure valve; Solenoid valve B, pressure control valve, Manual pressure valve are connected with three backwater entrances of catch basin respectively;
Described detecting and controlling system is provided with the D.C. regulated power supply, 24V direct supply, pressure transducer, guidance panel, control mainboard and the monitor that are connected by cable, D.C. regulated power supply in described detecting and controlling system converts alternating current to direct current, for pressure transducer provides direct supply, described 24V direct supply provides power supply for solenoid valve A, B; Described control mainboard is electrically connected with guidance panel, monitor, pressure transducer and two solenoid valves respectively, controls and realize the program that two solenoid valves perform setting to open and close automatically by controlling mainboard, and realize control detection system and carry out data acquisition and preservation; By carrying out cycle pulse pressure detection repeatedly, automatically being sent by guidance panel when pressure anomaly appears in tested pipeline and reporting to the police and detection of end work.
2. pressure pipeline pick-up unit according to claim 1, is characterized in that: described retaining valve enters multistage centrifugal pump for controlling current, in plant maintenance process, close described retaining valve; Described Manual pressure valve is for arranging the original pressure of tested pipeline, and namely in the forward direction tested pipeline detecting beginning, water-filling also keeps the original pressure of setting.
3. pressure pipeline pick-up unit according to claim 1, it is characterized in that: the horsepower of described multistage centrifugal pump is selected according to the volume of tested pipeline and bearing capacity, the head height of pump and the loss of flood peak calculate according to the diameter of connecting tube and the highest pressure design of bearing of tested pipeline; In pick-up unit, two solenoid valve pressure of piping system and connection are according to the working pressure designing and calculating of tested pipeline.
4. use the pressure pipeline pick-up unit described in claim 1 to carry out a method for pipe detection, it is characterized in that, operate as follows:
, detect before, be connected with solenoid valve A tested pipeline one end, the other end is connected with solenoid valve B, and tested pipeline is also provided with pressure transducer; Start and control mainboard and guidance panel, and setting comprises solenoid valve A, B applying pulse temporal width, pressure parameter on guidance panel, the working pressure parameter of Manual pressure valve and pressure control valve; Then manually pressure valve is full of water to tested pipeline and keeps initialization pressure;
(2), when detecting beginning, under the control controlling mainboard and guidance panel, pressure control valve, Manual pressure valve and solenoid valve B close automatically, solenoid valve A applies pulse test pressure to tested pipeline water-filling under the pressure effect of water, within the time pulsewidth of setting, make the pressure of tested pipeline reach rated operating pressure, solenoid valve A closes automatically, automatically open when the pressure of solenoid valve B then in tested pipeline has exceeded the set pressure of solenoid valve B and pressure release, after the time pulsewidth of setting, tested pipeline pressure recover is to initial setting up pressure, solenoid valve B closes automatically, pressure transducer gathers the data of whole pulse test, and sends the preservation of control mainboard and process to,
(3), when solenoid valve A closes, multistage centrifugal pump works on, and pipeline pressure in solenoid valve A front end increases, and when pressure increase is to the setting working pressure of pressure control valve, pressure control valve is automatically opened and current are back to catch basin;
(4), pick-up unit follow procedure automatically again repetitive cycling step (2), (3), carry out water-filling and apply pulse and detect next time; In testing process each time, pressure transducer constantly carries out pressure data collection automatically, and constantly data is delivered to control mainboard, controls mainboard and preserves and process the coherent detection time and data message that gather, and show on a monitor;
(5), after pick-up unit carries out the detection of several pulse, when finally detecting that tested pipeline working pressure occurs abnormal, automatically sent by guidance panel and report to the police and detection of end work;
(6), according to the number of times of the pressure pulse test carried out tested pipeline, machine process draws the serviceable life of the tested pipeline of budget under its condition of work as calculated.
5. use pressure pipeline pick-up unit according to claim 4 carries out the method for pipe detection, it is characterized in that: the described time pulsewidth set solenoid valve A is 2 ~ 6 seconds, the time pulsewidth set solenoid valve B is 4 ~ 8 seconds, namely solenoid valve A opens in 2 ~ 6 seconds that pressure in rear tested pipeline opens at solenoid valve A and reaches rated operating pressure instantaneously, solenoid valve A automatically closes after the pulse width time of setting, because solenoid valve A closes, pressure in tested pipeline exceedes the pressure of solenoid valve B setting and magnet valve B is opened, normal pressure is got back to regard to pressure release after 4 ~ 8 seconds that pressure in tested pipeline is opened at solenoid valve B, solenoid valve B closes automatically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410654329.XA CN104330311B (en) | 2014-11-17 | 2014-11-17 | A kind of pressure pipeline detection device and detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410654329.XA CN104330311B (en) | 2014-11-17 | 2014-11-17 | A kind of pressure pipeline detection device and detection method |
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| Publication Number | Publication Date |
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| CN104330311A true CN104330311A (en) | 2015-02-04 |
| CN104330311B CN104330311B (en) | 2016-11-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486447A (en) * | 2015-12-29 | 2016-04-13 | 常熟市上海飞奥压力容器制造有限公司 | Pipeline pressure detection device |
| CN106289997A (en) * | 2016-11-07 | 2017-01-04 | 新乡市万和过滤技术股份公司 | A kind of pressure test detection device |
| CN110333152A (en) * | 2019-07-19 | 2019-10-15 | 中国舰船研究设计中心 | A kind of pipeline fatigue test board |
-
2014
- 2014-11-17 CN CN201410654329.XA patent/CN104330311B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486447A (en) * | 2015-12-29 | 2016-04-13 | 常熟市上海飞奥压力容器制造有限公司 | Pipeline pressure detection device |
| CN106289997A (en) * | 2016-11-07 | 2017-01-04 | 新乡市万和过滤技术股份公司 | A kind of pressure test detection device |
| CN110333152A (en) * | 2019-07-19 | 2019-10-15 | 中国舰船研究设计中心 | A kind of pipeline fatigue test board |
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| Publication number | Publication date |
|---|---|
| CN104330311B (en) | 2016-11-23 |
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