CN110411843B - Pressure container or pipeline air pressure test system and test method - Google Patents
Pressure container or pipeline air pressure test system and test method Download PDFInfo
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- CN110411843B CN110411843B CN201910712767.XA CN201910712767A CN110411843B CN 110411843 B CN110411843 B CN 110411843B CN 201910712767 A CN201910712767 A CN 201910712767A CN 110411843 B CN110411843 B CN 110411843B
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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
- G01N3/12—Pressure testing
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
Abstract
A pressure container or pipeline air pressure test system and a test method are provided, the system comprises a pressure generating module generating hydraulic pressure, a pressure conducting module and a control module, the pressure conducting module comprises a pressure stabilizing tank, the bottom of the pressure stabilizing tank is provided with a hydraulic pipeline for inputting and outputting a hydraulic medium to the pressure stabilizing tank, the upper part of the pressure conducting module is provided with an air pressure pipeline connected with a pressure container or pipeline to be tested and an air inlet pipeline keeping the air pressure of an upper cavity balanced, the output end of the pressure generating module is connected with the hydraulic pipeline, the hydraulic pipeline and the air pressure pipeline are respectively provided with a plurality of sensors, the hydraulic pipeline is also provided with a controlled assembly for controlling the on-off size of the hydraulic pressure, and the controlled assembly and the sensors are respectively connected with the control module. The pressure generation module adopts liquid as a medium and only adopts gas as a medium in a test section, so that the technical difficulty and cost of equipment are reduced, the equivalent volume of the gas is reduced, the test time is saved, and the failure damage risk coefficient is reduced.
Description
Technical Field
The invention relates to the technical field of pressure vessel or pipeline air pressure tests, in particular to a pressure vessel or pipeline air pressure test system and a test method.
Background
With the development of industry, pressure-bearing equipment such as pressure vessels and pressure pipelines is widely used, and the equipment is becoming larger and has high parameters. For pressure vessels and pressure pipeline equipment with gaseous or gas-liquid mixed internal media, once leakage or rupture occurs, serious consequences can be caused, so that the pressure vessels and the pressure pipeline equipment generally require pressure resistance or fatigue test to verify the overall strength in the design and manufacturing stage. At present, in domestic and foreign standards, most of pressure resistance or fatigue tests for pressure vessels and pressure pipelines adopt liquid media such as water or hydraulic oil, and rarely adopt gas (especially active gas) for pressure tests. Considering that gas penetration is stronger than liquid, and the actual contained medium of the pressure-bearing equipment may have certain influence (such as corrosion) on the performance of equipment materials in the service process of the equipment, the actual service condition of the pressure-bearing equipment can be reflected more technically in the gas pressure test than in the hydraulic test. However, the air pressure test has obvious limitations: firstly, under the condition of the same pressure parameter, a pressure boosting device of air pressure and a pipe valve accessory thereof are more expensive than hydraulic pressure, and particularly for active or corrosive gas media such as hydrogen, hydrogen sulfide and the like, the technical realization difficulty of the pressure boosting device is huge and the cost is high; secondly, the gas has stronger compressibility, so that the pressurization time of the same test device under the same pressure parameter is longer, and the test period is obviously increased compared with that of a hydraulic test; thirdly, when the volume equivalent of the gas is large, the risk of damage in the gas pressure test is huge, and particularly when active gas is adopted, the possibility of chemical explosion is also existed, so that immeasurable potential safety hazards and economic losses are brought to testers, test equipment and the surrounding environment. Due to the above limitations, the pressure-resistant or fatigue test of pressure-bearing equipment such as pressure vessels and pipelines still has a not wide application range by using gas as a pressure medium, but the pressure-resistant or fatigue test by using a liquid medium sometimes has a situation that the actual use condition of the pressure-bearing equipment is not sufficiently reflected, so that it is particularly necessary to design and develop an air pressure test system and method which are relatively economical and practical and have a relatively high safety factor for the pressure-bearing equipment such as the pressure vessels and the pressure pipelines.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a pressure vessel or pipeline air pressure test system and a test method.
The invention adopts the following technical scheme:
the utility model provides a pressure vessel or pipeline atmospheric pressure test system, is including producing hydraulic pressure generation module, pressure conduction module, control module, pressure conduction module includes the surge tank, the bottom of surge tank is provided with the hydraulic pressure pipeline, the upper portion of exporting the surge tank with the hydraulic medium input and output and is provided with the atmospheric pressure pipeline with the pressure vessel or the pipe connection that await measuring and keeps the balanced air inlet pipeline of upper portion cavity atmospheric pressure, the output and the hydraulic pressure pipe connection of pressure generation module, all be provided with multiple sensor on hydraulic pressure pipeline and the atmospheric pressure pipeline, still be provided with the controlled subassembly of control hydraulic pressure break-make size on the hydraulic pressure pipeline, controlled subassembly and sensor are connected with control module respectively.
Preferably, a liquid inlet pipeline is arranged on the side edge of the pressure stabilizing tank close to the lower part, and a lower stop valve is arranged on the liquid inlet pipeline.
Preferably, an air inlet pipeline is arranged on the side, close to the upper side, of the pressure stabilizing tank, and an upper stop valve is arranged on the air inlet pipeline.
Preferably, the end part of the hydraulic pipeline below the pressure stabilizing tank is provided with a liquid discharge pipeline, and a liquid discharge valve is arranged on the liquid discharge pipeline.
Preferably, a dryer and a middle stop valve are arranged on the air pressure pipeline, the joints of the air pressure pipeline, the pressure container or the pipeline and the pressure stabilizing tank respectively extend out of pipelines communicated with the atmosphere, and a pressure relief valve and an emptying valve are arranged on the pipelines respectively.
Preferably, the controlled assembly comprises a booster pump group and a three-position four-way electromagnetic valve which are arranged on a hydraulic pipeline according to the flow direction of a hydraulic medium, a filter and a one-way valve are further arranged on the hydraulic pipeline, and the controlled ends of the booster pump group and the three-position four-way electromagnetic valve are respectively connected with the corresponding control ends of the control module.
Optimized, the sensor includes temperature sensor, hydraulic pressure sensor, baroceptor, hydraulic pressure sensor and temperature sensor's sense terminal sets up respectively in the position department that hydraulic pressure pipeline is close to the output, and baroceptor sets up in the position department that the baroceptor is close to the pressure vessel or the pipeline export that await measuring at the baroceptor.
The test method using the pressure vessel or pipeline air pressure test system comprises the following steps:
s1, selecting a proper surge tank according to the volume V of the pressure container or pipeline to be tested and the pressure P of the air pressure test, wherein the volume of the surge tank is (15-20) PV;
s2, filling the hydraulic medium into the surge tank until the liquid level of the hydraulic medium is higher than the joint of the hydraulic pipeline and the surge tank
Stopping filling liquid, wherein A represents the cross-sectional area of the inside of the pressure stabilizing tank;
s3, replacing air in the air pressure pipeline, the pressure stabilizing tank and the pressure container or pipeline to be tested with a set air medium until the air pressure in the pressure container or pipeline to be tested is zero, and controlling valves on all pipelines communicated with the atmosphere by the control module to be closed;
s4, setting parameters of pressure test pressure, pressure increasing rate, pressure maintaining time and alarm temperature on the control module when the system is used for air pressure test; when the system is used for carrying out an air pressure fatigue test, setting parameters of fatigue test pressure, frequency, cycle times and alarm temperature on the control module;
s5, controlling a booster pump group in the controlled assembly to work, enabling the liquid level of the liquid medium in the pressure stabilizing tank to gradually rise, compressing the gas medium in the pressure stabilizing tank, transmitting the pressure to a container or a pipeline to be tested communicated with the pressure stabilizing tank, and enabling the container or the pipeline to be subjected to a pressure withstand test and a pressure fatigue test;
and S6, after the test is finished, opening valves on all pipelines communicated with the atmosphere on the air pressure pipeline to release the pressure in the container or pipeline to be tested and the pressure in the pressure stabilizing tank, and opening a liquid discharge valve on a liquid discharge pipeline below the pressure stabilizing tank to completely discharge the liquid medium in the pressure stabilizing tank.
Preferably, in step S2, the liquid medium is input into the pressure stabilizing tank from the liquid inlet pipeline by opening the lower stop valve on the liquid inlet pipeline.
The invention has the advantages that:
(1) the pressure generation module in the invention is hydraulic, namely liquid (water or common hydraulic oil) is used as a medium for testing, pressure conduction is carried out by using gas as an experimental medium, and as the gas compression ratio is larger, the molecular weight is small, the penetrability is strong, and some active gases are dangerous, the compression difficulty of pneumatic equipment is larger, and the technical requirement is higher, so that a large amount of equipment cost can be saved by selecting hydraulic equipment and parts, the test period is shortened, the possibility of leakage is reduced, and the potential safety hazard is reduced.
(2) The pressure conduction module can replace the air pressure medium at any time according to different requirements of the gas test medium without changing the whole test system, and in addition, the gas pressure resistance or fatigue test can be carried out only by replacing the electromagnetic valve, so that the practical application of the invention has wider universality and flexibility.
(3) The test system and the test method can use gas as a medium to carry out air pressure resistance or air pressure fatigue test on the structural member of the pressure container or the pipeline to be tested, and the bearing capacity and the fatigue performance of the structural member of the pressure container or the pipeline to be tested are under the action of air pressure; the invention has simple structure and accurate and reliable test result, the pressure generating modules such as the booster pump group, the pipe valve and the like adopt liquid as a medium, and only adopt gas as the medium in the test section, thereby reducing the technical difficulty and cost of the equipment, reducing the equivalent volume of the gas, saving the test time, reducing the failure damage risk coefficient, and being capable of replacing other gas media for testing under the condition that the pressure generating module is kept unchanged, improving the utilization rate of the equipment, saving the resource and reducing the cost.
Drawings
FIG. 1 is a schematic view of the structure of the test system of the present invention.
Fig. 2 is a schematic structural diagram of the surge tank and each pipeline and valve on the surge tank.
The notations in the figures have the following meanings:
1-water tank 2-filter 3-booster pump group 4-one-way valve 5-three-position four-way solenoid valve
6-hydraulic pipeline 7-control circuit 8-temperature sensor 9-hydraulic sensor
10-control module 11-air pressure sensor 12-dryer 13-middle stop valve 14-air release valve
15-pneumatic pipeline
16 surge tank 161 intake line 162 gaseous medium 163 liquid medium
164-liquid inlet line 165-first air pressure balancing line 166-second air pressure balancing line
167-liquid discharge line
17-upper stop valve 18-lower stop valve 19-drain valve
20-container or pipeline to be tested 21-pressure relief valve
Detailed Description
Example 1
As shown in fig. 1-2, a pressure vessel or pipeline air pressure test system includes a pressure generation module for generating hydraulic pressure, a pressure transmission module, and a control module 10.
The pressure conduction module comprises a pressure stabilizing tank 16, a hydraulic pipeline 6 for inputting and outputting a hydraulic medium to the pressure stabilizing tank 16 is arranged at the bottom of the pressure stabilizing tank 16, an air pressure pipeline 15 connected with a pressure container or a pipeline to be detected and an air inlet pipeline 161 for keeping the air pressure of an upper cavity balanced are arranged at the upper part of the pressure stabilizing tank 16, the output end of the pressure generation module is connected with the hydraulic pipeline 6, a plurality of sensors are arranged on the hydraulic pipeline 6 and the air pressure pipeline 15, a controlled assembly for controlling the on-off size of hydraulic pressure is further arranged on the hydraulic pipeline 6, and the controlled assembly and the sensors are connected with the control module 10 through corresponding control lines 7 respectively.
A liquid inlet pipeline 164 is arranged on the side edge of the lower part of the pressure stabilizing tank 16, and a lower stop valve 18 is arranged on the liquid inlet pipeline 164. An air inlet pipeline 161 is arranged on the side edge of the upper portion of the surge tank 16, and an upper stop valve 17 is arranged on the air inlet pipeline 161. The end part of the hydraulic pipeline 6 positioned below the pressure stabilizing tank 16 is provided with a liquid discharge pipeline, and a liquid discharge valve 19 is arranged on the liquid discharge pipeline.
The pneumatic pipeline 15 is provided with a dryer 12 and a middle stop valve 13, the joints of the pneumatic pipeline 15, the pressure container or pipeline and the surge tank 16 respectively extend out of a first pneumatic balance pipeline 165 and a second pneumatic balance pipeline 166 which are communicated with the atmosphere, and a pressure relief valve 21 and an air release valve 14 are respectively arranged on the pneumatic balance pipeline.
The controlled assembly comprises a booster pump group 3 and a three-position four-way electromagnetic valve 5 which are arranged on a hydraulic pipeline 6 according to the flow direction of a hydraulic medium, the hydraulic pipeline 6 is also provided with a filter 2 and a one-way valve 4, and the controlled ends of the booster pump group 3 and the three-position four-way electromagnetic valve 5 are respectively connected with the corresponding control ends of a control module 10. In this embodiment, most of the components of the pressure generating module, such as power equipment, pipelines, valves, and meters, may be hydraulic, and the liquid medium 163 is water. The input end of the hydraulic pipeline 6 extends into the water tank, and the filter 2, the one-way valve 4, the booster pump group 3 and the three-position four-way electromagnetic valve 5 are sequentially arranged along the liquid flow direction of the hydraulic pipeline 6. The other output end of the three-position four-way electromagnetic valve 5 directly reversely flows into the water tank.
The sensor includes temperature sensor 8, hydraulic sensor 9, baroceptor 11, hydraulic sensor 9 and temperature sensor 8's sense terminal sets up respectively in the position department that hydraulic pressure pipeline 6 is close to the output, and baroceptor 11 sets up in the position department that baroceptor 15 is close to the pressure vessel or the pipeline export that awaits measuring.
Example 2
A method of testing using the pressure vessel or pipeline atmospheric testing system of example 1, comprising the steps of:
s1, selecting a proper surge tank 16 according to the volume V of the pressure container or pipeline to be tested and the air pressure test pressure P, wherein the volume of the surge tank 16 is (15-20) PV;
s2, filling the hydraulic medium into the surge tank 16, the liquid level of the hydraulic medium to be measured is higher than the liquid level at the joint of the hydraulic pipeline 6 and the surge tank 16
Stopping filling, wherein a represents the cross-sectional area of the interior of surge tank 16;
s3, replacing air in the air pressure pipeline 15, the surge tank 16 and the pressure container or pipeline to be tested with a set air medium 162 until the air pressure in the pressure container or pipeline to be tested is zero, and controlling valves on all pipelines for communicating the air pressure pipeline 15 with the atmosphere to be closed by the control module 10;
s4, setting parameters of pressure test pressure, pressure increasing rate, pressure maintaining time and alarm temperature on the control module 10 when the system is used for air pressure test; when the system is used for carrying out an air pressure fatigue test, parameters of fatigue test pressure, frequency, cycle times and alarm temperature are set on the control module 10;
s5, controlling the booster pump group 3 in the controlled assembly to work, so that the liquid level of the liquid medium 163 in the pressure stabilizing tank 16 gradually rises, compressing the gas medium 162 in the pressure stabilizing tank 16, transmitting the pressure to the container or pipeline 20 to be tested communicated with the pressure stabilizing tank, and subjecting the container or pipeline to be tested to a pressure withstand test and a pressure fatigue test;
and S6, after the test is finished, opening valves on all pipelines communicated with the atmosphere on the air pressure pipeline 15 to release the pressure in the container or pipeline 20 to be tested and the pressure in the surge tank 16, opening the liquid discharge valve 19 on the liquid discharge pipeline below the surge tank 16, and discharging the liquid medium 163 in the surge tank 16 completely.
In step S2, two options are included, the first is to input the liquid medium 163 into the surge tank 16 from the liquid inlet line 164 by opening the lower stop valve 18 on the liquid inlet line 164. In this solution, the liquid inlet pipe 164 can be directly connected to the water tap, so that it is not necessary to adjust the value of the booster pump group 3, and the operation is convenient. The second solution is that when the liquid inlet line 164 is not provided, water can be pumped from the water tank into the surge tank 16 by adjusting the pressure of the booster pump group 3, which eliminates the need for the liquid inlet line 164 and the lower stop valve 18.
The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A pressure container or pipeline air pressure test system is characterized by comprising a pressure generation module for generating hydraulic pressure, a pressure transmission module and a control module (10), the pressure conduction module comprises a pressure stabilizing tank (16), a hydraulic pipeline (6) for inputting and outputting a hydraulic medium to the pressure stabilizing tank (16) is arranged at the bottom of the pressure stabilizing tank (16), an air pressure pipeline (15) connected with a pressure container or a pipeline to be tested and an air inlet pipeline (161) for keeping the air pressure of the upper cavity balanced are arranged at the upper part of the pressure stabilizing tank (16), the output end of the pressure generation module is connected with a hydraulic pipeline (6), a plurality of sensors are arranged on the hydraulic pipeline (6) and the air pressure pipeline (15), the hydraulic pipeline (6) is also provided with a controlled assembly for controlling the on-off of hydraulic pressure, and the controlled assembly and the sensor are respectively connected with the control module (10);
the test method of the pressure vessel or pipeline air pressure test system is characterized by comprising the following steps:
s1, selecting a proper surge tank (16) according to the volume V of the pressure container or pipeline to be tested and the air pressure test pressure P, wherein the volume of the surge tank (16) is (15-20) PV;
s2, filling the hydraulic medium into the surge tank (16), and keeping the liquid level of the hydraulic medium higher than the joint of the hydraulic pipeline (6) and the surge tank (16)
Stopping filling, wherein A represents the cross-sectional area of the interior of the surge tank (16);
s3, replacing air in the air pressure pipeline (15), the pressure stabilizing tank (16) and the pressure container or pipeline to be tested with a set gas medium (162), and controlling valves on all pipelines for communicating the air pressure pipeline (15) with the atmosphere to be closed by the control module (10);
s4, when the system is used for an air pressure test, setting pressure test pressure, pressure increasing rate, pressure maintaining time and alarm temperature parameters on the control module (10); when the system is used for carrying out an air pressure fatigue test, parameters of fatigue test pressure, frequency, cycle times and alarm temperature are set on the control module (10);
s5, controlling a booster pump set (3) in the controlled assembly to work, enabling the liquid level of a liquid medium (163) in the pressure stabilizing tank (16) to gradually rise, compressing a gas medium (162) in the pressure stabilizing tank (16), transmitting the pressure into a container or pipeline (20) to be tested communicated with the pressure stabilizing tank, and enabling the container or pipeline to be subjected to a pressure withstanding test and a pressure fatigue test;
s6, after the test is finished, opening valves on all pipelines communicated with the atmosphere on the air pressure pipeline (15) to release the pressure in the container or the pipeline (20) to be tested and the pressure in the pressure stabilizing tank (16), opening a liquid discharge valve (19) on a liquid discharge pipeline (167) below the pressure stabilizing tank (16), and completely discharging the liquid medium (163) in the pressure stabilizing tank (16).
2. The pressure vessel or pipeline air pressure test system of claim 1, wherein a liquid inlet pipeline (164) is arranged on the side of the lower portion of the pressure stabilizing tank (16), and a lower stop valve (18) is arranged on the liquid inlet pipeline (164).
3. The pressure vessel or pipeline air pressure test system according to claim 1 or 2, wherein an air inlet pipeline (161) is arranged on the upper side of the surge tank (16), and an upper stop valve (17) is arranged on the air inlet pipeline (161).
4. The pressure vessel or pipeline air pressure test system of claim 1, characterized in that the end part of the hydraulic pipeline (6) below the surge tank (16) is provided with a drain pipeline (167), and a drain valve (19) is arranged on the drain pipeline (167).
5. The pressure vessel or pipeline air pressure test system of claim 1, characterized in that the air pressure pipeline (15) is provided with a dryer (12) and a middle stop valve (13), the joints of the air pressure pipeline (15) with the pressure vessel or pipeline and the surge tank (16) respectively further extend out of pipelines communicated with the atmosphere, and a pressure relief valve (21) and an air release valve (14) are respectively arranged on the pipelines.
6. The pressure vessel or pipeline air pressure test system according to claim 1, wherein the controlled assembly comprises a booster pump group (3) and a three-position four-way electromagnetic valve (5) which are arranged on a hydraulic pipeline (6) according to the flow direction of a hydraulic medium, a filter (2) and a one-way valve (4) are further arranged on the hydraulic pipeline (6), and the controlled ends of the booster pump group (3) and the three-position four-way electromagnetic valve (5) are respectively connected with the corresponding control ends of the control module (10).
7. The pressure vessel or pipeline air pressure test system according to claim 6, wherein the sensors comprise a temperature sensor (8), a hydraulic pressure sensor (9) and an air pressure sensor (11), the detection ends of the hydraulic pressure sensor (9) and the temperature sensor (8) are respectively arranged at the position of the hydraulic pipeline (6) close to the output end, and the air pressure sensor (11) is arranged at the position of the air pressure pipeline (15) close to the outlet of the pressure vessel or pipeline to be tested.
8. The pressure vessel or pipeline gas pressure test system as claimed in claim 1, wherein in step S2, the liquid medium (163) is inputted into the surge tank (16) from the liquid inlet pipeline (164) by opening the lower stop valve (18) on the liquid inlet pipeline (164).
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| CN113090756B (en) * | 2019-12-23 | 2023-07-25 | 深圳市发利机械设备结构有限公司 | Pressure vessel with buffer device for offshore oil engineering |
| CN113640127A (en) * | 2020-05-11 | 2021-11-12 | 国家能源投资集团有限责任公司 | Method for testing gas filling equipment |
| CN111982723A (en) * | 2020-07-22 | 2020-11-24 | 中联重科股份有限公司 | Pressure vessel pulse fatigue test device |
| CN113776949A (en) * | 2021-08-12 | 2021-12-10 | 北京航天控制仪器研究所 | Pressure resistance testing device and method for glass bulb of atomic gas chamber |
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| CN107014598A (en) * | 2017-04-21 | 2017-08-04 | 合肥通用机械研究院 | A kind of air valve air inlet performance testing device and method of testing |
| CN208381032U (en) * | 2017-12-20 | 2019-01-15 | 广州市新欧机械有限公司 | A kind of hydraulic valve fatigue and high pressure resistant testing stand |
| CN109030252A (en) * | 2018-07-25 | 2018-12-18 | 浙江大学 | Monitoring device and method for composites gas cylinder fatigue damage under hot environment |
| 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 |
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