CN111896239A - Valve end connection fire resistance test system and test method - Google Patents
Valve end connection fire resistance test system and test method Download PDFInfo
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- CN111896239A CN111896239A CN202010548767.3A CN202010548767A CN111896239A CN 111896239 A CN111896239 A CN 111896239A CN 202010548767 A CN202010548767 A CN 202010548767A CN 111896239 A CN111896239 A CN 111896239A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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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
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
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Abstract
A valve end connection fire resistance test system and a test method are provided, the system comprises a combustion device, a combustion chamber and a test chamber, wherein the combustion device provides conditions for a fire resistance test, and the combustion chamber provides an environment for the fire resistance test of a tested valve; the bending moment loading device is used for applying force to the tested valve and enabling the tested valve to enter and exit the combustion chamber; the pressure pipeline device is arranged outside the combustion chamber and extends into the pipeline to the combustion chamber to be connected with two ends of the valve to be tested; the leakage detection device comprises a sealing cover wrapped outside the detected valve, and a leakage detection assembly connected with the sealing cover through a pipeline and arranged outside the combustion chamber. The invention adopts the incompressible solution as the test medium which is pushed to the tested valve by the pressure air source, thereby ensuring that the solution is used in the whole test process, and the leakage detection device does not need to be additionally provided with a liquid filter, an air filter and a compensation pipeline, and simultaneously avoiding the pressure fluctuation caused by overlarge pressure ratio when the traditional booster pump drives water as the pressure source, and ensuring the precision of test measurement.
Description
Technical Field
The invention relates to the technical field of valve end connection tests, in particular to a valve end connection fire resistance test system and a test method.
Background
The end connection of a valve in the petroleum and petrochemical industry is a potential failure point of a device system, when the end connection of the valve or a flange is exposed to a high-temperature flame environment for a long time, the heating speed of the outer part of the flange and bolts is faster than that of the inner part of the flange and a sealing part, the temperature gradient of a connection point is generated, meanwhile, due to the fact that the temperature is increased, the rigidity of a joint is reduced, the gasket, the stud and the like are buckled, permanent stretching is generated, permanent pretightening force loss is caused, valve leakage is caused, and economic loss, environmental damage and major safety accidents are caused. Therefore, it is desirable to provide a device and method for testing the fire resistance of a valve end connection. Scientific and reasonable design test system is the prerequisite that accurate test valve end connection fire behavior is good or bad, and prior art has not been to valve end connection fire behavior measuring technique yet.
Disclosure of Invention
In order to reduce driving equipment and improve the utilization rate of space, the invention provides a valve end connection fire resistance testing system and a testing method. The invention adopts the following technical scheme:
a valve end connection fire resistance test system comprises
The combustion device provides conditions for a fire resistance test and also provides an environmental combustion chamber for the fire resistance test of the valve to be tested;
the bending moment loading device is used for applying force to the tested valve and enabling the tested valve to enter and exit the combustion chamber;
the pressure applying pipeline device is arranged outside the combustion chamber, extends into the pipeline to the combustion chamber, is connected with two ends of the valve to be measured, and is used for introducing liquid into the valve to be measured to change the pressure of the valve to be measured;
the leakage detection device comprises a sealing cover wrapped outside the detected valve, and a leakage detection assembly connected with the sealing cover through a pipeline and arranged outside the combustion chamber.
The testing method for connecting the fire resistance testing system with the valve end comprises the following steps:
s1, after the valve to be tested is installed on a flange of the bending moment loading device, two ends of the valve to be tested are respectively connected with corresponding pipelines of the pressure applying pipeline device and the output pipeline device, then a sealing cover is arranged on the valve to be tested, and the leakage detection assembly is connected with the arranged sealing cover through a pipeline;
s2, inputting gas into the sealing cover through a pipeline by the leakage detection assembly until pressure not less than a first set value is applied, detecting the performance of the sealing cover, and then introducing gas for drying the pipeline and the sealing cover in the leakage device;
s3, opening the second switch valve and the fifth switch valve to enable liquid in the liquid storage container to pass through the valve to be detected and then to be discharged through the output pipeline to force out air, and closing the second switch valve and the fifth switch valve;
s4, opening a pressure regulating valve on a connecting pipeline of a pressurizing assembly and a liquid storage container in the pressurizing pipeline device, and increasing the pressure of the tested valve; opening a fourth switch valve in the combustion device to provide fuel for ignition and controlling temperature values of a thermocouple in the combustion device at different stages;
and S5, after the combustion is carried out for a set time, starting the bending moment loading device, enabling the two ends of the tested valve to be stressed, increasing the bending moment in a stepped manner within a certain time, collecting the leakage amount corresponding to the bending moment applied each time, and collecting the maximum bending moment under the condition of keeping the total leakage amount not to exceed the maximum allowable leakage amount.
The invention has the advantages that:
(1) the invention adopts the incompressible solution as the test medium which is pushed to the tested valve by the pressure air source, ensures that the whole test process uses water, does not need to add a liquid filter, an air filter and a compensating pipeline in the leakage detection device, simultaneously avoids the pressure fluctuation caused by overlarge pressure ratio when the traditional booster pump drives water as the pressure source, and ensures the precision of test measurement.
(2) This application orders about valve clamping mechanism seesaw through power unit, makes the measured valve business turn over furnace body, fixes on left bending moment loading arm of force and right bending moment loading arm of force the measured valve of first flange both can receive the pulling force effect under jacking pressure measurement component's effect, can receive the pressure effect again to the realization is exerted the moment of flexure to valve end connection.
(3) The setting of installation pole can be applicable to the first jacking part of different strokes, does not need first jacking part at the flexible overlength of test procedure at every turn, practices thrift test time.
(4) The setting of second jacking part is used for the direction of motion and the definite movement distance of guide valve clamping mechanism, and the direction of second jacking part can be confirmed in the setting of wheel and guide rail, for preventing that the direction change from producing the effort of vertical direction to second jacking part.
(5) Set up the filter in stock solution container exit, can effectively filter aquatic impurity, improve the life and the performance of system. The problem that the cooling capacity of the traditional U-shaped air blocking pipe is insufficient is effectively solved by the cooler.
(6) The condenser in the leakage detection device is convenient for collecting leakage media, and the measurement precision of the leakage in the test is ensured.
Drawings
Fig. 1-2 are schematic structural views of the present invention.
Fig. 3 is an enlarged view of a portion of the valve clamping mechanism.
The notations in the figures have the following meanings:
111-left bending moment loading moment arm 112-right bending moment loading moment arm 1101-second flange
113-first flange
121-moving plate 122-supporting column 1221-U-shaped groove 123-heat insulation pad 124-wheel
131-first jacking part 132-mounting rod 133-third pressure sensor
141-second jacking component 142-adjusting part 15-hydraulic station
21-pressure air source 22-pressure regulating valve 23-first safety valve
24-liquid storage container 241-liquid level meter 25-first switch valve 26-filter
27-second switching valve 28-cooler 29-first pressure sensor 210-third switching valve
211-fifth on-off valve
31-second safety valve 32-second pressure sensor 33-condenser 34-measuring vessel
35-combustion chamber 36-sealing cover
41-fourth switch valve
5-measured valve 6-remote control mechanism
Detailed Description
As shown in FIG. 1, a system for testing the fire resistance of a valve end connection comprises
The combustion device provides conditions for a fire resistance test, and also comprises an environmental combustion chamber 35 for the fire resistance test of the tested valve 5.
The bending moment loading device is used for applying force to the tested valve 5 and enabling the tested valve 5 to enter and exit the combustion chamber 35;
the pressure applying pipeline device is arranged outside the combustion chamber 35, extends into the pipeline to the combustion chamber 35, is connected with two ends of the valve 5 to be tested, and is used for introducing liquid into the valve 5 to be tested to change the pressure of the valve 5 to be tested;
the leakage detection device comprises a sealing cover 36 wrapped outside the detected valve 5 and a leakage detection assembly which is connected with the sealing cover 36 through a pipeline and is arranged outside the combustion chamber 35;
and the remote control mechanism 6 is used for receiving data of each sensor and controlling the corresponding component to work.
Each apparatus is described in detail below.
1. Bending moment loading device
As shown in fig. 2-3, the bending moment loading device includes a movable pushing mechanism, a valve clamping mechanism and a power mechanism, which are disposed on the movable pushing mechanism. The valve clamping mechanism and the movable pushing mechanism are both welded by adopting a steel plate made of 310S stainless steel high-temperature-resistant materials.
The valve clamping mechanism comprises a left bending moment loading force arm 111 and a right bending moment loading force arm 112 which are erected on the movable pushing mechanism, a first flange 113 for fixing the tested valve 5 is arranged at one end part of the left bending moment loading force arm 111, which is opposite to the right bending moment loading force arm 112, the other end part of the left bending moment loading force arm 111 is provided with a jacking pressure measuring assembly for adjusting the angle between the left bending moment loading force arm 111 and the right bending moment loading force arm 112, and the power mechanism drives the valve to be tested to move back and forth inside and outside the combustion chamber 35 on the movable pushing mechanism. In this embodiment, the section of the left bending moment loading arm 111 and the right bending moment loading arm 112 close to the first flange 113 is connected with the adjacent section through the second flange 1101, so that the first flange 113 can be replaced, and the valve testing device is suitable for different tested valves 5.
The jacking pressure measuring assembly comprises an installation rod 132 vertically arranged with a right bending moment loading force arm 112, a first jacking component 131 is arranged at the end of the installation rod 132, a third pressure sensor 133 is fixed on the side surface, facing the installation rod 132, of the left bending moment loading force arm 111, a third pressure sensor 133 is pointed by the jacking component, and the first jacking component 131 stretches in the horizontal direction. The installation rod 132 and the right bending moment loading arm 112 are of a vertical integrated structure, in this scheme, the first jacking component 131 is a hydraulic telescopic rod, and the hydraulic telescopic rod is communicated with an oil path of a hydraulic station 15 of the power mechanism. The stroke of the first jacking component 131 is not more than 500 mm.
According to the valve 5 to be measured, the end parts of the first flanges 113 are installed by replacing the left bending moment loading force arm 111 and the right bending moment loading force arm 112 on the second flanges 1101, the valve 5 to be measured is fixed on the first flanges 113 through screws, at the moment, the telescopic rods of the first jacking parts 131 are located in the middle of the oil cylinder and can extend out, so that the valve 5 to be measured on the first flanges 113 is pressed, at the moment, the third pressure sensor 133 can detect the pressure and can also shrink, and pulling force is applied to the valve 5 to be measured.
The moving pushing mechanism comprises a moving plate 121, a second jacking component 141, a wheel 124 arranged below the moving plate 121 and a brake pedal, wherein one end of the second jacking component 141 is arranged on the moving plate 121, and the other end of the second jacking component is connected with the outer side of the combustion chamber 35. The wheels 124 are arranged to move back and forth within the respective tracks. The second jacking part 141 is a hydraulic cylinder, and the hydraulic cylinder is communicated with an oil way of the hydraulic station 5 of the power mechanism. Specifically, the stroke of the second jacking member 141 is not more than 500 mm. One end of the second jacking component 141 is hinged to the combustion chamber 35, the other end of the second jacking component 141 is hinged to the moving plate 121 through the adjusting part 142, the adjusting part 142 is a screw rod, the screw rod is used for adjusting the stroke of the second jacking component 141, and the second jacking component 141 is used for determining whether the valve 5 to be tested is located in the combustion chamber 35.
The power mechanism is driven by hydraulic pressure, and an oil return filter is arranged on an oil path of the power mechanism and is used for keeping the cleanliness of oil.
The method for calculating the drift diameter D of the valve to be measured by the remote control mechanism 6 comprises the following steps:
s1, obtaining the force F applied by the first jacking component 1311And the pressure of the tested medium on the valve side F2Wherein the magnitude of the force F applied by the first jacking member 1311The calculation formula of (a) is as follows:
F1＝M/L
wherein: m is the maximum moment, and L is the moment arm;
the pressure of the tested medium on the valve side is F2The calculation formula of (a) is as follows:
F2＝πD2/4×P
wherein: p is the pressure of the test medium, and D is the drift diameter of the valve;
s2, according to the magnitude of the force applied by the first jacking part 131, the pressure of the tested medium on the valve side is consistent, namely F1＝F2Obtaining the drift diameter of the valve 5 to be measured
2. Pressure pipeline device
The pressure applying pipeline device comprises a pipeline connected with the input end of the tested valve 5, and a liquid storage container 24, a second switch valve 27, an output pipeline connected with the output end of the tested valve 5 and a fifth switch valve 211 arranged on the output pipeline are sequentially arranged on the pipeline; the pressurizing pipeline device further comprises a pressurizing assembly, wherein the pressurizing assembly comprises a pressure air source 21, a pressurizing pipeline for connecting the pressure air source 21 and a liquid storage container 24, and a pressure regulating valve 22 arranged on the pressurizing pipeline. A first safety valve 23 is also arranged on the pressure increasing pipeline.
The pressure application pipeline device further comprises a liquid inlet pipeline arranged at the other end of the liquid storage container 24, a first switch valve 25 is arranged on the liquid inlet pipeline, a filter 26 is arranged between the liquid storage container 24 and a second switch valve 27, and a cooler 28 is further arranged between the second switch valve 27 and the valve 5 to be tested; the line between the second switching valve 27 and the cooler 28 branches off into a branch line which is connected to the first pressure sensor 29 via a third switching valve 210. The liquid level meter 241 is also arranged on the side surface of the liquid storage container 24. In this embodiment, the reservoir 24 contains water.
3. Leak detection device
The leakage detection assembly comprises a leakage detection pipe, a condenser 33 connected with a leakage detection hole in the sealing cover 36 through the leakage detection pipe, and a liquid measuring device 34 connected with the condenser 33. In this embodiment the gauge 34 is a measuring cylinder. The sealing cover 36 is a metal foil stuffing sealing cover. The sealing cap 36 is provided with two leak detection holes which are connected with two side leak pipelines with equal length, and the leak detection pipelines enter the measuring device after passing through the condenser. The ignition point in the combustion device ignites and heats the seal cover 36.
The leakage detection device further comprises a second branch pipeline extending out of the sealing cover 36 and connected with the second pressure sensor 32, and a second safety valve 31 is arranged at the tail end of the second branch pipeline.
Example 2
A method of testing using a valve end connection fire resistance testing system as described in example 1, comprising the steps of:
s1, after the valve 5 to be tested is installed on a flange of the bending moment loading device, two ends of the valve 5 to be tested are respectively connected with corresponding pipelines of the pressure applying pipeline device and the output pipeline device, then a sealing cover 36 is arranged on the valve 5 to be tested, and the leakage detection assembly is connected with the arranged sealing cover 36 through a pipeline;
the process of step S1 for installing the valve 5 to be tested on the flange of the bending moment loading device is as follows:
s11, starting a hydraulic pump starting button on an operation table of the remote control mechanism 6, starting a hydraulic system in the power mechanism to work, and simultaneously, starting an indicator lamp of a hydraulic station in the power mechanism to light;
s12, pressing an oil cylinder extending button corresponding to the first jacking part 231 to clamp the valve 5 to be tested;
and S13, pressing an oil cylinder extending button corresponding to the second jacking part 241, and moving the pushing mechanism to convey the valve 5 to be detected to a station to be detected.
S2, inputting gas into the sealing cover 36 through the pipeline by the leakage detection component until a pressure not less than 0.034MPa is applied, detecting the performance of the sealing cover 36, and then drying the pipeline in the leakage device and the sealing cover 36 by dry nitrogen or compressed air;
s3, opening the second switch valve 27 and the fifth switch valve 211 to enable the liquid in the liquid storage container 24 to pass through the valve 5 to be tested and then discharge forced air through an output pipeline, and closing the second switch valve 27 and the fifth switch valve 211;
s4, opening the pressure regulating valve 22 on the pipeline connecting the pressurizing assembly and the liquid storage container 24 in the pressurizing pipeline device, and increasing the pressure of the valve 5 to be measured; opening a fourth switch valve 41 in the combustion device to supply fuel gas, providing fuel for ignition, and controlling temperature values of a thermocouple in the combustion device at different stages; specifically, the average temperature of the thermocouple reaches 761 ℃ within 2 minutes, and the thermocouple reading is not lower than 704 ℃ in the rest time of the combustion test; the average calorimeter temperature reaches 650 ℃ within 15 minutes of ignition and must not fall below 565 ℃.
And S5, after burning for 25 minutes, starting the bending moment loading device, enabling the two ends of the tested valve 5 to be stressed, increasing the bending moment in a stepped manner within a certain time, collecting the leakage amount corresponding to the bending moment applied each time, and collecting the maximum bending moment under the condition of keeping the total leakage amount not to exceed the maximum allowable leakage amount. Specifically, the maximum bending moment is not less than 75% of the bearing capacity of the tested valve 5 every 15 seconds of pause of the bending moment.
And S6, after the detection is finished, pressing down the oil cylinder retracting button corresponding to the movable second jacking part 241, moving the valve 5 to be detected away from the detection position, after the valve is hoisted in place, pressing down the oil cylinder retracting button corresponding to the first jacking part 231, after the detection cycle is finished, and closing the hydraulic pump button.
The remote control mechanism 6 is connected with the bending moment loading device, and integrates the remote starting of a hydraulic pump, the remote regulation of bending moment loading and the control of the opening and the closing of each valve automatically; meanwhile, a digital display instrument is arranged to display the test result in real time. The device is connected with a measuring cylinder, a pressure sensor, a liquid level meter 241, a thermocouple, a calorimeter and the like, and can monitor and collect test data in real time.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A valve end connection fire resistance test system is characterized by comprising
The combustion device provides conditions for a fire resistance test, and also provides an environmental combustion chamber (35) for the tested valve (5) to perform the fire resistance test;
the bending moment loading device is used for applying force to the tested valve (5) and enabling the tested valve (5) to enter and exit the combustion chamber (35);
the pressure applying pipeline device is arranged outside the combustion chamber (35), extends into the pipeline to the combustion chamber (35), is connected with two ends of the valve to be tested (5), and is used for introducing liquid into the valve to be tested (5) to change the pressure of the valve to be tested (5);
the leakage detection device comprises a sealing cover wrapped outside the detected valve (5), and a leakage detection assembly connected with the sealing cover through a pipeline and arranged outside the combustion chamber (35).
2. The valve end connection fire resistance testing system of claim 1, wherein the bending moment loading device comprises a movable pushing mechanism, a valve clamping mechanism and a power mechanism, the valve clamping mechanism comprises a left bending moment loading force arm (111) and a right bending moment loading force arm (112) which are erected on the movable pushing mechanism, a first flange (113) for fixing the tested valve (5) (5) is respectively arranged at one end part of the left bending moment loading force arm (111) opposite to the right bending moment loading force arm (112), the other end part of the left bending moment loading force arm is provided with a jacking pressure measuring assembly for adjusting the angle between the left bending moment loading force arm (111) and the right bending moment loading force arm (112), and the power mechanism drives the valve to be tested on the movable pushing mechanism to move back and forth in the combustion chamber (35).
3. The valve end connection fire resistance testing system according to claim 2, wherein the jacking pressure measuring assembly comprises a mounting rod (132) arranged perpendicular to the right bending moment loading arm (112), a first jacking component (131) is arranged at the end of the mounting rod (132), a third pressure sensor (133) is fixed on the side surface of the left bending moment loading arm (111) facing the mounting rod (132), the jacking component points to the third pressure sensor (133), and the first jacking component (131) stretches in the horizontal direction.
4. The valve end connection fire resistance testing system according to claim 2, wherein the moving pushing mechanism comprises a moving plate (121) and a second jacking component (141), one end of the second jacking component (141) is arranged on the moving plate (121), the other end of the second jacking component is connected with the outer side of the combustion chamber (35), the moving pushing mechanism further comprises wheels (124) arranged below the moving plate (121), and the wheels (124) are arranged in corresponding guide rails to move back and forth.
5. The valve end connection fire resistance test system according to claim 1, wherein the pressure applying pipeline device comprises a pipeline connected with the input end of the valve (5) to be tested, a liquid storage container (24), a second switch valve (27), an output pipeline connected with the output end of the valve (5) to be tested, and a fifth switch valve (211) arranged on the output pipeline, wherein the pipeline is sequentially provided with the liquid storage container (24), the second switch valve (27); the pressurizing pipeline device further comprises a pressurizing assembly, wherein the pressurizing assembly comprises a pressure air source (21), a pressurizing pipeline for connecting the pressure air source (21) and a liquid storage container (24), and a pressure regulating valve (22) arranged on the pressurizing pipeline.
6. The valve end connection fire resistance test system according to claim 5, wherein the pressure applying pipeline device further comprises a liquid inlet pipeline arranged at the other end of the liquid storage container (24), a first switch valve (25) is arranged on the liquid inlet pipeline, a filter (26) is arranged between the liquid storage container (24) and a second switch valve (27), and a cooler (28) is further arranged between the second switch valve (27) and the valve (5) to be tested; a branch line is branched from the line between the second switching valve (27) and the cooler (28) and is connected with a first pressure sensor (29) through a third switching valve (210).
7. The valve end connection fire resistance testing system of claim 1, wherein the leak detection assembly comprises a leak detection pipe and a condenser (33) connected with a leak detection hole on the sealing cover through the leak detection pipe, and further comprises a liquid measurement gauge (34) connected with the condenser (33).
8. The valve end connection fire resistance test system according to claim 7, wherein the leakage detecting device further comprises a second branch pipeline extending from the sealing cover and connected with a second pressure sensor (32), and a second safety valve (31) is arranged at the tail end of the second branch pipeline.
9. A method of testing a valve end connection fire resistance testing system according to any one of claims 1 to 8, comprising the steps of:
s1, after the valve (5) to be detected is installed on a flange of the bending moment loading device, two ends of the valve (5) to be detected are respectively connected with corresponding pipelines of the pressure applying pipeline device and the output pipeline device, then a sealing cover is arranged on the valve (5) to be detected, and the leakage detecting assembly is connected with the arranged sealing cover through a pipeline;
s2, inputting gas into the sealing cover through a pipeline by the leakage detection assembly until pressure not less than a first set value is applied, detecting the performance of the sealing cover, and then introducing gas for drying the pipeline and the sealing cover in the leakage device;
s3, opening the second switch valve (27) and the fifth switch valve (211), enabling the liquid in the liquid storage container (24) to pass through the valve (5) to be tested, then discharging forced air through an output pipeline, and closing the second switch valve (27) and the fifth switch valve (211);
s4, opening a pressure regulating valve (22) on a connecting pipeline of a pressurizing assembly and a liquid storage container (24) in the pressurizing pipeline device, and increasing the pressure of the valve (5) to be measured; opening a fourth switch valve in the combustion device to provide fuel for ignition and controlling temperature values of a thermocouple in the combustion device at different stages;
and S5, after the combustion is carried out for a set time, starting the bending moment loading device, enabling the two ends of the tested valve (5) to be stressed, increasing the bending moment in a stepped manner within a certain time, collecting the leakage amount corresponding to the bending moment applied each time, and collecting the maximum bending moment under the condition of keeping the total leakage amount not to exceed the maximum allowable leakage amount.
10. The test method according to claim 9,
in step S4, the temperature values of the thermocouple in the combustion apparatus at different stages are controlled as follows: the average temperature of the thermocouple reaches 761 ℃ within 2 minutes, and the thermocouple reading is not lower than 704 ℃ in the rest time of the combustion test; the average temperature of the calorimeter reaches 650 ℃ within 15 minutes of ignition, and is not lower than 565 ℃;
in step S5, after burning for 25 minutes, the bending moment loading device is started, the bending moment is suspended for 15 seconds every time the bending moment is added, and the maximum bending moment is not less than 75% of the bearing capacity of the measured valve (5).
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| CN114577464A (en) * | 2020-12-02 | 2022-06-03 | 中国石油化工股份有限公司 | Breathing valve burning resistance testing device and method |
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| 项美根 等: "阀门扭矩和弯矩连续测试装置及其检测方法", 《阀门》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114577464A (en) * | 2020-12-02 | 2022-06-03 | 中国石油化工股份有限公司 | Breathing valve burning resistance testing device and method |
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| CN111896239B (en) | 2022-04-08 |
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