A high temperature and high pressure hose testing system and testing method

Abstract

The application discloses a high-temperature and high-pressure hose testing system and a testing method. The two ends of the hose to be tested are respectively connected through metal end covers to form a relatively closed testing cavity; a heating device is arranged outside the testing cavity to heat; a cooling device is arranged outside the testing cavity to cool; a heat-insulating pressure-resistant protective cover is wrapped outside the testing cavity, the heating device and the cooling device; a water injection port and an exhaust port are arranged on the metal end cover to inject testing water and discharge air, and an automatic valve on the exhaust port can realize system pressure relief; a sensing assembly is arranged on the hose to be tested and the metal end cover to monitor temperature, pressure, strain and displacement in real time; and a camera is arranged in the heat-insulating pressure-resistant protective cover. The application aims to solve the problems of the prior art, such as complex structure, high cost, difficulty in simultaneously and accurately controlling temperature and pressure and single testing dimension, and simultaneously has the functions of multi-dimensional mechanical property online monitoring and visual observation.

Description

Technical Field

[0001] This invention belongs to the field of high temperature and high pressure fluid testing technology, specifically relating to a testing system and testing method for testing the performance of high temperature and high pressure resistant hoses (e.g., operating temperature 450℃, pressure 15MPa). Background Technology

[0002] In aerospace, nuclear energy, chemical, and thermal power generation fields, flexible connecting hoses capable of operating at extremely high temperatures and pressures are often required, for example, to connect rigid pipes to moving containers or to compensate for thermal expansion. These hoses must undergo rigorous high-temperature and high-pressure performance testing before leaving the factory, including pressure resistance, sealing performance, thermal stability, and deformation characteristics.

[0003] Traditional testing methods typically employ an external high-pressure pump (such as a pneumatic-hydraulic pump) to pressurize the hose, while simultaneously using a separate heating device to heat the medium inside or outside the hose. Disadvantages of this method include: (1) Ordinary hydraulic oil will decompose at high temperatures. When water is commonly used as a medium, a complex supercritical water pressurization system is required to reach temperatures above 450°C, which results in high equipment costs.

[0004] (2) It requires an independent pressurization system, heating system and complex pressure-temperature coordinated control, which makes the system complex and energy-intensive.

[0005] (3) The connection between the hose and the test fixture is prone to leakage under high temperature and high pressure, and it is difficult to accurately simulate the transient process when temperature and pressure arrive at the same time in actual working conditions.

[0006] (4) Traditional testing systems can usually only measure the pressure resistance and sealing performance of hoses. It is difficult to obtain mechanical response data such as deformation and displacement of hoses during the test process, and it is impossible to comprehensively evaluate the overall performance of hoses under high temperature and high pressure.

[0007] (5) The lack of visual monitoring of the testing process makes it difficult to detect early signs of failure on the surface of the hose (such as cracks, bulges, etc.) in real time.

[0008] Therefore, there is an urgent need for a hose testing system and method that is simple in structure, low in cost, easy to control, can realistically simulate high temperature and high pressure conditions, and has multi-dimensional performance monitoring capabilities. Summary of the Invention

[0009] This invention aims to solve the problems of complex structure, high cost, difficulty in accurately controlling temperature and pressure at the same time, and single testing dimension in existing high temperature and high pressure hose testing systems. It provides a self-pressurizing testing system and method based on the principle of hydrothermal expansion and phase change in a closed system. This testing system also has the functions of online monitoring and visualization of multi-dimensional mechanical properties.

[0010] To achieve the above objectives, the present invention provides the following technical solution: I. A high-temperature, high-pressure hose testing system, comprising: The test tube is sealed at both ends with metal end caps to form a relatively closed test chamber. A heating device is arranged around the test chamber to heat the test chamber and the internal medium. A cooling device is arranged around the test chamber to cool the chamber and the internal medium. A heat-insulating and pressure-resistant protective cover is provided to cover the outside of the test chamber, heating device, and cooling device to reduce heat loss and provide safety protection. The water inlet and vent are located on the metal end cap and are used to inject a preset mass of test water into the test chamber and expel the initial air; an automatic valve is installed on the vent to depressurize the test chamber. The sensing components are installed on the test tube and the metal end cap to monitor the temperature, pressure, strain, and displacement of the test chamber / test tube in real time. The camera, installed inside the heat-insulated and pressure-resistant protective cover, is used to collect images of the hose under test in real time during the testing process.

[0011] The sensing component includes: A temperature sensor, mounted on a metal end cap, is used to monitor the internal temperature of the test chamber in real time. A pressure sensor, mounted on a metal end cap, is used to monitor the internal pressure of the test chamber in real time. A strain sensor is installed on the outer surface of the middle part of the hose under test to monitor the strain of the hose under high temperature and high pressure in real time. The displacement sensor is located in the middle of the hose under test and is used to measure the axial or radial displacement of the hose under high temperature and high pressure.

[0012] It also includes a control unit, which is electrically connected to the heating device, camera, and sensing components respectively. The control unit is used to calculate the required mass of water based on the target temperature and target pressure and the thermodynamic state equation of water, control the heating process of the heating device so that the internal pressure of the hose under test increases with the temperature and remains stable after the target pressure and temperature are reached, and simultaneously collect and process the monitoring data of each sensor in the sensing components in real time.

[0013] The test chamber consists of a metal end cap and the inner cavity of the tubing under test, forming a closed volume. The tubing under test itself is both the test object and part of the closed volume.

[0014] The heating device is an electric heating wire wound around the end cap; the cooling device is a cooling pipe wound around the end cap, the cooling pipe has an independent cooling water inlet and a cooling water outlet, both of which are located at the top of the end cap, extend through the top of the heat-insulating and pressure-resistant protective cover and are connected to an external circulating refrigeration unit or an open ambient temperature water source.

[0015] The sensor bodies of both the temperature sensor and the pressure sensor are located inside the heat-insulating and pressure-resistant protective cover, and are connected to the control unit only through a data cable. The control unit includes a data acquisition module, a PID control module, and a safety interlock module. The data acquisition module and the PID control module achieve and maintain the target temperature and pressure. When the pressure or temperature exceeds the set threshold, the heating is automatically cut off, the exhaust valve is activated, and an alarm is triggered.

[0016] II. High-temperature and high-pressure hose testing method, the method comprising the following steps: Step 1: Install metal caps at both ends of the hose to be tested to ensure a seal; Step 2: Measure the total volume V of the test chamber; Step 3: Based on the set target temperature T target and target pressure P target Calculate the density of water under the target conditions. ρ target Then, based on the total volume V, calculate the required mass of pure water to be injected. m ; Step 4: Inject mass into the system through the water inlet. m Pure water is introduced, and air is discharged through the exhaust port. Then all valves are closed to form a closed system. Step 5: Start the heating device and heat the test chamber according to the set temperature rise curve, while monitoring the internal pressure and temperature in real time through temperature and pressure sensors; When the temperature reaches the target temperature, the control unit shuts off the electric heating; if heat leakage in the system causes the temperature of the test chamber to drop, the electric heating is activated to restore the temperature to the target temperature.

[0017] In step three, when the target temperature exceeds the critical temperature of water (374.15℃), the equation of state for water becomes the equation of state for a supercritical fluid, and the density is calculated using the NIST REFPROP or IAPWS-IF97 standard.

[0018] In step five, the electric heating is restarted after heat leakage to keep the system stable under the target operating conditions for at least 30 minutes.

[0019] After the test, heating was stopped and the cooling device was started to introduce cooling water into the cooling pipes to cool and depressurize the system and recover the residual water.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects: (1) No external high-pressure pump required: The pressure is generated by the thermal expansion and phase change characteristics of water in the closed system, which is especially suitable for ultra-high temperature (>374℃) and ultra-high pressure (>22MPa) working conditions, and the equipment cost is greatly reduced.

[0021] (2) Pressure-temperature natural coupling: Pressure is generated simultaneously during the heating process, avoiding the lag and mismatch caused by separate control of pressure and temperature in traditional systems, and more realistically simulating the actual force on the hose when it is rapidly heated.

[0022] (3) Precise and controllable: By pre-calculating the water injection volume, the target working point can be accurately set, and the system structure is simple and easy to automate.

[0023] (4) High safety: The system has a small volume and no high-speed moving parts. The pressure can be adjusted by controlling the heating power. With the help of safety interlock protection, the risk is low. The heat-insulating and pressure-resistant protective cover has the dual functions of heat preservation and safety protection.

[0024] (5) High test accuracy: Because the medium is uniform in the entire closed system, the temperature and pressure sensors directly reflect the real environment inside the hose, and the data is reliable.

[0025] (6) Multi-dimensional comprehensive testing capability: By setting strain sensors and displacement sensors in the middle of the hose, strain and displacement data of the hose can be acquired simultaneously during high temperature and high pressure testing, realizing online monitoring of the mechanical properties of the hose; the appearance changes of the hose can be observed in real time through the camera, and early failure signs can be detected in time.

[0026] (1) Independent cooling system: The cooling pipe is completely independent from the water inlet and the exhaust port, which can quickly cool down after the test, improve the test efficiency, and the cooling water circuit does not come into contact with the test medium, thus avoiding cross-contamination. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the high-temperature and high-pressure hose testing system in an embodiment of the present invention.

[0028] The markings in the diagram are: 1-Hose under test; 2-Metal end cap (flange connection); 3-Heating device and insulation layer; 4-Cooling pipe and insulation layer; 5-Cooling water inlet; 6-Cooling water outlet; 7-Temperature sensor; 8-Pressure sensor; 9-Water inlet; 10-Exhaust port; 11-Insulated and pressure-resistant protective cover; 12-Camera; 13-Strain sensor; 14-Displacement sensor; 15-Data cable; 16-Control unit. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, the system architecture includes: The test hose 1 is sealed at both ends by metal end caps 2, thus forming a relatively closed test chamber. The internal medium for adding pure water is placed inside the test chamber. The working temperature of the test hose 1 is 450℃ and the pressure is 15MPa.

[0031] Heating device 3 is arranged around the test chamber and is used to heat the test chamber and its internal medium; the internal medium of the test chamber can be pure water.

[0032] Cooling device 4 is arranged around the test chamber and is used to cool the system; The heat-insulating and pressure-resistant protective cover 11 covers the test chamber, heating device 3 and cooling device 4 of the test hose 1, which is used to reduce heat loss and also has a safety protection function. The water inlet 9 and the vent 10 are located on the metal end cap 2 at one end of the test hose 1, and are used to inject a preset mass of test water into the test chamber and expel the initial air; the test water is deionized water or distilled water. The sensing components are installed on the test hose 1 and the metal end cap 2 to monitor the temperature, pressure, strain and displacement of the test chamber / test hose 1 under high temperature and high pressure in real time.

[0033] Camera 12 is installed inside the heat-insulating and pressure-resistant protective cover 11 and is used to collect real-time images of the appearance of the hose 1 under test during the test process.

[0034] The sensing component includes: Temperature sensor 7 is installed on the metal end cap 2 at one end of the hose 1 to be tested, and is used to monitor the internal temperature of the test chamber in real time. Pressure sensor 8 is installed on the metal end cap 2 at the same end of the hose 1 to be tested, and is used to monitor the internal pressure of the test chamber in real time; Strain sensor 13 is disposed on the outer surface of the middle part of the test hose 1, and is used to monitor the strain of the test hose 1 under high temperature and high pressure in real time. Displacement sensor 14 is located in the middle of the hose 1 under test and is used to measure the axial or radial displacement of the hose 1 under high temperature and high pressure.

[0035] In specific implementation, it also includes a control unit 16, which is electrically connected to the heating device, camera, and sensing components respectively. It is used to calculate the required mass of water according to the target temperature and target pressure based on the thermodynamic state equation of water, control the heating process of the heating device so that the internal pressure of the hose 1 under test increases with the temperature and remains stable after reaching the target pressure and temperature, and at the same time collects and processes the monitoring data of each sensor in the sensing components in real time.

[0036] The test chamber is a closed volume composed of the metal end cap 2 and the inner cavity of the hose under test 1. The hose under test 1 itself is both the test object and part of the closed volume.

[0037] The heating device 3 is an electric heating wire 3 wound around the right end cap.

[0038] The cooling device consists of a cooling pipe 4 wound around the left end cap. The cooling pipe 4 has an independent cooling water inlet 5 and a cooling water outlet 6. Both the cooling water inlet 5 and the cooling water outlet 6 are located at the top of the left end cap, extending through the top of the heat-insulating and pressure-resistant protective cover 11 and connecting to an external circulating chiller or an open ambient temperature water source. The cooling pipe 4 is completely independent of the water inlet 9 and the vent 10 in structure and piping, and they are not connected to each other. The metal end cap 2 is connected by a flange.

[0039] The sensor bodies of temperature sensor 7 and pressure sensor 8 are both located inside the heat-insulating and pressure-resistant protective cover 11, and are connected to the control unit 16 only through data cable 15.

[0040] The control unit 16 includes a data acquisition module, a PID control module, and a safety interlock module. The data acquisition module and the PID control module achieve and maintain the target temperature and pressure. When the pressure or temperature exceeds the set threshold, the heating is automatically cut off, the exhaust valve is activated, and an alarm is triggered.

[0041] Preferably, the heating device can also be a resistance heating furnace, an electromagnetic induction heater, or a thermal oil jacketed heater.

[0042] Preferably, the heat-insulating and pressure-resistant protective cover is composed of ceramic fiber, aerogel felt or multi-layer heat insulation material combined with a pressure-resistant shell.

[0043] The experimental testing methods for the system of this invention include: Step 1: Install metal caps 2 at both ends of the hose 1 to be tested, ensuring a seal; Step 2: Measure the total volume V of the test chamber; Step 3: Based on the set target temperature T target and target pressure P target Consult the equation of state or density table of water under high temperature and high pressure to calculate the pressure at the target temperature. Ttarget and target pressure P target Density of water under target conditions ρ target Then, combined with the total volume V, according to the formula m = ρ target × V Calculate the required mass of pure water to be injected. m ; Step 4: Inject mass into the system through water inlet 9 m Pure water is supplied, and air is discharged through exhaust port 10. Then all valves are closed to form a closed system. Step 5: Start the heating device 3 and heat the test chamber according to the set temperature rise curve. At the same time, the internal pressure and temperature are monitored in real time by the temperature sensor 7 and the pressure sensor 8. When the temperature reaches the target temperature, the pressure in the system will automatically rise to the target pressure due to the phase change of water and the pressure increase of steam. The control unit (16) will turn off the electric heating. If the system leaks heat and causes the temperature of the test chamber to drop, the electric heating will be started to restore the temperature to the target temperature.

[0044] In step three, when the target temperature exceeds the critical temperature of water (374.15℃), the equation of state for water becomes the equation of state for supercritical fluids, and the density is calculated using the NIST REFPROP or IAPWS-IF97 standard.

[0045] In step five, the electric heating is restarted after heat leakage to keep the system stable under the target operating conditions for at least 30 minutes.

[0046] After the test, the heating was stopped and the cooling device 4 was started to introduce cooling water into the cooling pipe 4 to cool down and depressurize the system and recover the residual water.

[0047] When the hose under test is equipped with a sensing function, the changes in the electrical signal of the hose under high temperature and high pressure are recorded simultaneously.

[0048] Step five involves continuously recording the changes in pressure and temperature over time using temperature and pressure sensors while maintaining a stable state for a predetermined period. Simultaneously, strain sensor 13 and displacement sensor 14 collect real-time strain and displacement data of the hose, and camera 12 observes and records the appearance of the hose in real time. This comprehensive evaluation assesses the pressure resistance and sealing performance, mechanical deformation characteristics, and appearance integrity of the hose under high temperature and pressure.

[0049] The embodiments of the present invention are as follows: Example 1 This embodiment takes the testing of a metal braided hose with operating parameters of 450℃ and 15MPa as an example.

[0050] System construction: such as Figure 1 As shown, the two ends of the hose 1 under test are connected to metal end caps 2 via flanges. The metal end caps 2 have pre-drilled mounting holes for temperature sensors 7 and pressure sensors 8, as well as a water inlet 9 and an exhaust port 10. An electric heating wire 3 is wound around the outside of the right end cap as a heating device, and a cooling pipe 4 is wound around the outside of the left end cap. The cooling water inlet 5 and cooling water outlet 6 of the cooling pipe are independently located at the top of the left end cap, extending through the top of the insulated and pressure-resistant protective cover 11, completely independent of the water inlet 9 and the exhaust port 10 in structure and piping. The entire hose and end caps are covered by the insulated and pressure-resistant protective cover 11. A strain sensor 13 and a displacement sensor 14 are installed on the outer surface of the middle part of the hose 1 under test, and a camera 12 is installed inside the insulated and pressure-resistant protective cover. Each sensor is connected to a control unit 16 via a data cable 15. The control unit 16 uses a PLC and connects to thermocouples, a pressure transmitter, a strain acquisition module, a displacement acquisition module, and a video acquisition module.

[0051] Volume calibration: Fill the system with room temperature water, weigh the injected water, and divide the mass by the density of water at room temperature to obtain the total volume. V = 150 mL.

[0052] Target operating parameters: T target = 450℃, P target = 15 MPa. Referring to the IAPWS-IF97 table of properties of water and water vapor, at 450℃ and 15 MPa, the density of water is... ρ target ≈ 90.2 kg / m 3 (Supercritical water state). Calculate the required injection water mass. m = 90.2 kg / m 3 × 0.00015 m 3 = 0.01353 kg = 13.53 g.

[0053] Water injection and air venting: Inject 13.53 g of deionized water through water injection port 9 using a precision syringe, then open air vent 10 and gently tilt the system to expel internal air until a small amount of water overflows from the air vent. Then close the air vent and water injection port.

[0054] Heating and Testing: The electric heating wire 3 was activated, and the heating rate was set to 5℃ / min. The control unit 16 read temperature, pressure, strain, displacement data, and camera video footage in real time. When the temperature reached approximately 445℃, the pressure reading was 14.8 MPa; with continued heating, the pressure reached exactly 15.0 MPa at 450℃. The control unit automatically switched to PID constant temperature control, with pressure fluctuations less than ±0.1 MPa. This state was maintained for 2 hours. During this period, no leaks were found by the pressure sensor or visual inspection. The hose deformation data recorded by the strain and displacement sensors were within the normal range, and the camera footage showed no abnormalities in the hose's appearance.

[0055] Cooling and Completion: After the test is completed, stop heating, open cooling water inlet 5, and let cooling water flow into cooling pipe 4, then discharge it from cooling water outlet 6 to quickly cool and depressurize the system to room temperature and atmospheric pressure. Open exhaust valve 10 to release residual gas, disconnect the hose, and the test is complete.

[0056] Comparative test: If the traditional external pressurization method is used, an ultra-high pressure pump and a sealing structure that can withstand 450℃ are required. The equipment investment is more than 5 times that of this invention. Moreover, the pressure needs to be manually adjusted during the heating process, making it difficult to reach the target value at the same time.

[0057] Example 2 (Fatigue Test) The target pressure is then changed to a periodic fluctuation mode. In this mode, no additional pressurization pump is needed. Instead, the heating power of the electric heating wire 3 is periodically fine-tuned by the control unit 16, causing the water temperature within the system to circulate between 440℃ and 460℃, with the pressure correspondingly pulsating between 14.5 and 15.5 MPa at a frequency of up to 0.1 Hz. During this process, strain sensors 13 and displacement sensors 14 continuously record the deformation response of the hose under cyclic pressure, while camera 12 continuously records changes in the hose's appearance. This allows for thousands of cyclic fatigue tests and hose fatigue life assessments, a simple and low-cost solution that is difficult to achieve using traditional methods.

[0058] Safety measures: The system is equipped with a rupture disc (set pressure 18 MPa) and a safety valve (set pressure 16.5 MPa). The control unit 16 also has an over-temperature and over-pressure interlock to cut off the heating function.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-temperature, high-pressure hose testing system, characterized in that, include: The test tube (1) is sealed at both ends by metal caps (2) to form a relatively closed test chamber; A heating device (3) is arranged around the test chamber to heat the test chamber and the internal medium. A cooling device (4) is arranged around the test chamber to cool the chamber and the internal medium. A heat-insulating and pressure-resistant protective cover (11) is used to cover the outside of the test chamber, heating device (3) and cooling device (4) to reduce heat loss and also to provide safety protection. The water inlet (9) and the vent (10) are set on the metal end cap (2) to inject a preset mass of test water into the test chamber and to discharge the initial air; an automatic valve is set on the vent (10) to realize the depressurization of the test chamber; The sensing components are installed on the test hose (1) and the metal end cap (2) to monitor the temperature, pressure, strain and displacement of the test chamber / test hose (1) in real time. A camera (12) is installed inside a heat-insulating and pressure-resistant protective cover (11) to collect images of the hose (1) under test in real time during the test process.

2. The high-temperature and high-pressure hose testing system according to claim 1, characterized in that, The sensing component includes: Temperature sensor (7) is installed on metal head (2) for real-time monitoring of the internal temperature of the test chamber; A pressure sensor (8) is installed on the metal head (2) to monitor the internal pressure of the test chamber in real time. A strain sensor (13) is installed on the outer surface of the middle part of the hose (1) to be tested, and is used to monitor the strain of the hose (1) under high temperature and high pressure in real time. The displacement sensor (14) is located in the middle of the hose (1) to be tested and is used to measure the axial or radial displacement of the hose (1) under high temperature and high pressure.

3. The high-temperature and high-pressure hose testing system according to claim 1, characterized in that, It also includes a control unit (16), which is electrically connected to the heating device, camera and sensing components respectively. It is used to calculate the required water mass according to the target temperature and target pressure and the thermodynamic state equation of water, control the heating process of the heating device so that the internal pressure of the hose (1) under test increases with the temperature and remains stable after reaching the target pressure and temperature, and collects and processes the monitoring data of each sensor in the sensing components in real time.

4. The high-temperature and high-pressure hose testing system according to claim 1, characterized in that, The test chamber is a closed volume composed of the metal end cap (2) and the inner cavity of the hose to be tested (1). The hose to be tested (1) itself is both the test object and part of the closed volume.

5. The high-temperature and high-pressure hose testing system according to claim 1, characterized in that, The heating device (3) is an electric heating wire (3) wound around the end cap; The cooling device is a cooling pipe (4) wrapped around the end cap. The cooling pipe (4) is provided with an independent cooling water inlet (5) and cooling water outlet (6). The cooling water inlet (5) and cooling water outlet (6) are both located at the top of the end cap, and extend through the top of the heat-insulating and pressure-resistant protective cover (11) to connect to an external circulating chiller or an open ambient temperature water source.

6. The high-temperature and high-pressure hose testing system according to claim 1, characterized in that, The sensor bodies of the temperature sensor (7) and the pressure sensor (8) are both located inside the heat-insulating and pressure-resistant protective cover (11) and are connected to the control unit (16) only through the data cable (15). The control unit (16) includes a data acquisition module, a PID control module and a safety interlock module. The data acquisition module and the PID control module achieve and maintain the target temperature and pressure. When the pressure or temperature exceeds the set threshold, the heating is automatically cut off, the exhaust valve is started and an alarm is triggered.

7. A method for testing high-temperature and high-pressure hoses using the system described in any one of claims 1 to 6, characterized in that, The method includes the following steps: Step 1: Install metal caps (2) at both ends of the hose (1) to be tested, and ensure a seal; Step 2: Measure the total volume V of the test chamber; Step 3: Based on the set target temperature T target and target pressure P target Calculate the density of water under the target conditions. ρ target Then, based on the total volume V, calculate the required mass of pure water to be injected. m ; Step 4: Inject mass into the system through the water inlet (9) m Pure water is used to discharge air through the exhaust port (10), and then all valves are closed to form a closed system; Step 5: Start the heating device (3) and heat the test chamber according to the set temperature rise curve. At the same time, monitor the internal pressure and temperature in real time through the temperature sensor (7) and pressure sensor (8). When the temperature reaches the target temperature, the control unit (16) turns off the electric heating; if the system leaks heat and causes the temperature of the test chamber to drop, the electric heating is started to restore the temperature to the target temperature.

8. The high-temperature and high-pressure hose testing method according to claim 7, characterized in that, In step three, when the target temperature exceeds the critical temperature of water (374.15℃), the equation of state for water becomes the equation of state for a supercritical fluid, and the density is calculated using the NIST REFPROP or IAPWS-IF97 standard.

9. The high-temperature and high-pressure hose testing method according to claim 7, characterized in that, In step five, the electric heating is restarted after heat leakage to keep the system stable under the target operating conditions for at least 30 minutes.

10. The high-temperature and high-pressure hose testing method according to claim 7, characterized in that, After the test, the system is cooled and depressurized by stopping the heating and starting the cooling device (4) and introducing cooling water into the cooling pipe (4) to recover the residual water.

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