A kind of tank liquid level passage measurement calibration test device and method

Abstract

The application provides a kind of tank liquid level passage measurement calibration test device and method, device includes balance water tank, calibration water tank and calibration hose, by being set respectively on the water outlet pipe of the lower end of balance water tank and calibration water tank pressure / liquid level table and multiple quick couplings, the quick coupling of balance water tank is connected with the low pressure side of liquid level instrument, the quick coupling of calibration water tank is connected with the high pressure side of liquid level instrument, in addition, another quick coupling is set on the water outlet pipe of the lower end of calibration water tank and is connected with calibration hose, and balance water tank and calibration water tank are connected with a gas pressure device;Gas pressure device is used for transmitting gas pressure to the low pressure side and high pressure side of the liquid level instrument to be calibrated, is also used for respectively pressing the water in the balance water tank and calibration water tank into the low-high pressure side of liquid level instrument, calibration hose is used for being pulled to the height of pre-set to simulate tank liquid level.The application can realize multiple airtightness inspection, balance tank water supply, liquid level instrument calibration, online monitoring and leak point pipeline isolation and other functions.

Description

Technical Field

[0001] This invention relates to the field of instrument calibration technology, specifically to a test device and method for measuring and calibrating the liquid level channel of a storage tank. Background Technology

[0002] Nuclear power plant evaporator tanks are equipped with multiple level gauges with wide and narrow ranges to monitor their liquid levels. Before being put into use, these level gauges need to be calibrated to ensure that their accuracy is within the design requirements. In the nuclear power field, this is called the nuclear power plant evaporator level channel measurement calibration test.

[0003] The calibration process for the narrow-range level gauge 100 is as follows: Figure 1 As shown, a temporary four-way valve is welded. Except for the inlet and free ends, the number of ports on the four-way valve corresponds to the number of narrow-range level gauges. Before the test, these ports are connected to the corresponding balance tank 400 (connected to the low-level end of the corresponding narrow-range gauge) via hoses. Water is pumped into the inlet of the four-way valve using a hand pump to replenish water and vent air from the balance tank 400 of the level gauge, ensuring the liquid level in each balance tank 400 is maintained at its midline (the midline is connected to the evaporator's storage tank 200 via a pipe, with excess water entering the evaporator's storage tank). This ensures the accuracy of the low-pressure side of the narrow-range gauges, thereby guaranteeing the accuracy of subsequent calibration tests. After replenishing water and venting air from the balance tank 400, these ports are then connected to the high-level end of the corresponding narrow-range gauge via hoses. Water is pumped into the inlet of the four-way valve using a hand pump, and the free end of the four-way valve is manually raised until the water level reaches the specified level of the evaporator's storage tank. Then, the instrument calibration is performed. That is, by pulling the hose to a pre-set liquid level to simulate the evaporator liquid level, the instrument reading is recorded and compared with the theoretical value to determine the correctness of the instrument channel.

[0004] The above-mentioned test scheme has the following technical problems: the hoses are all fixed by binding, which often leads to water leakage. During the test, additional personnel need to climb up and down to check and repair the leaks, causing operators to have to climb up and down the evaporator pit repeatedly. If water leakage occurs during the replenishment and venting of the balance tank 400 before the test, it is necessary to repeatedly check for the leak and replenish and vent. If the reading deviation is large during the calibration test, it is difficult to determine in time whether the leakage is caused by the positive or negative pressure side pipeline. The lack of necessary monitoring and troubleshooting methods results in low test efficiency, a harsh test environment, inconvenient personnel activity space, high physical exertion, and significant safety risks. In addition, the hand pump requires constant monitoring of the water level in the hand pump tank and timely replenishment of water. The operation of the hand pump is prone to causing air bubbles in the hose. The generation of air bubbles directly affects the accuracy and precision of the test data, causing the test results to fail to meet the acceptance requirements, thus requiring additional venting work. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art by providing a tank liquid level channel measurement and calibration test device that can realize multiple functions such as airtightness inspection, online monitoring, and leakage pipeline isolation. The test process does not require repeated water filling and venting, thereby improving the success rate of the test. The present invention also provides a test method for measuring and calibrating the tank liquid level channel using the test device.

[0006] The technical solution adopted to solve the technical problem of this invention is:

[0007] This invention provides a calibration test device for measuring the liquid level channel of a storage tank, comprising: a balance water tank, a calibration water tank, and a calibration hose.

[0008] The lower end of the balancing water tank is connected to a first outlet pipe, which is equipped with a first pressure / level gauge and multiple first quick connectors. These quick connectors are used to connect to the low-pressure side of one of the level gauges to be calibrated via a pipeline. The lower end of the calibration water tank is connected to a second outlet pipe, which is equipped with a second pressure / level gauge, a third quick connector, and multiple second quick connectors. These second quick connectors are used to connect to the high-pressure side of one of the level gauges to be calibrated via a pipeline.

[0009] The upper ends of both the balance tank and the calibration tank are connected to a pneumatic device. This pneumatic device transmits air pressure to the low-pressure side of the level gauge to be calibrated via the balance tank and the first outlet pipe. It also transmits air pressure to the high-pressure side of the level gauge via the calibration tank and the second outlet pipe. Furthermore, it pressurizes water from the balance tank into a balance tank connected to the low-pressure side of the level gauge to be calibrated, and pressurizes water from the calibration tank to the high-pressure side of the level gauge to be calibrated. A first pressure / level gauge monitors the pressure of the first outlet pipe, and a second pressure / level gauge monitors the pressure of the second outlet pipe.

[0010] The calibration hose has a connecting end and a free end. The connecting end is used to connect with the third quick connector, and the free end can be raised or lowered under external force until the water level inside the hose is level with the various liquid level test elevation points of the storage tank.

[0011] Optionally, the first outlet pipe is also provided with a fourth quick connector for connecting to the connection end of the calibration hose. When the connection end of the calibration hose is connected to the fourth quick connector, its free end can be raised or lowered under external force until the water level in the water body inside is level with the elevation of the upper source point of the storage tank.

[0012] Optionally, the first water outlet pipe is further provided with a first water outlet valve, and the second water outlet pipe is further provided with a second water outlet valve.

[0013] Optionally, it also includes a water replenishment tank, which is connected to the air pressure device. The balance water tank and the calibration water tank are respectively connected to the water replenishment tank. The upper end of the water replenishment tank has a water inlet and a cover for opening or closing the water inlet; and / or,

[0014] The upper end of both the balance tank filling tank and the instrument calibration tank is provided with a water inlet and a cover for opening or closing the water inlet.

[0015] Optionally, the balance water tank, calibration water tank, and replenishment water tank are all mounted on a mobile trolley.

[0016] Optionally, the upper end of the balance water tank is provided with a first air inlet pipe for connecting to the air pressure device, and the first air inlet pipe is provided with a first air inlet valve;

[0017] The upper end of the calibration water tank is provided with a second air inlet pipe for connecting to the air pressure device, and a second air inlet valve is provided on the second air inlet pipe;

[0018] The upper end of the water tank is provided with a third air inlet pipe for connecting to the air pressure device, and the third air inlet pipe is provided with a third air inlet valve.

[0019] Optionally, it also includes a local liquid level indicating mechanism, which includes a calibration component and a measurement component. The measurement component is disposed on the storage tank or connected between the storage tank and a vertical wall near the storage tank, and is used to measure the elevation of the upper and lower reference points of the storage tank to the vertical wall. The calibration component includes a calibration ruler and a pulley, both of which are used to be installed on the vertical wall. The free end of the calibration hose passes around the pulley, and the elevation point of the upper and lower reference points of the storage tank measured to the vertical wall is located between the minimum reading line and the maximum reading line of the calibration ruler.

[0020] Optionally, the measurement assembly includes an upper laser locator and a lower laser locator. The upper laser locator is installed at the position corresponding to the upper source point on the storage tank, and is used to transfer the elevation of the upper source point of the storage tank to the vertical wall. The lower laser locator is installed at the position corresponding to the lower source point on the storage tank, and is used to transfer the elevation of the lower source point of the storage tank to the vertical wall; or,

[0021] The measurement assembly includes an upper connector and a lower connector. One end of the upper connector is connected to the water inlet pipe corresponding to the upper source point of the storage tank, and the other end is installed on the vertical wall. The upper connector is used to measure the elevation of the upper source point of the storage tank to the vertical wall. One end of the lower connector is connected to the water inlet pipe corresponding to the lower source point of the storage tank, and the other end is installed on the vertical wall. The lower connector is used to measure the elevation of the lower source point of the storage tank to the vertical wall.

[0022] The present invention also provides a test method for measuring and calibrating the liquid level channel of a storage tank using the above-mentioned test apparatus, comprising the following steps:

[0023] S1: Perform an airtightness check on the low-pressure side and high-pressure side of the level gauge to be calibrated.

[0024] Perform an airtightness check on the low-pressure side of the level gauge to be calibrated, specifically including:

[0025] Connect the low-pressure side of the level gauge to be calibrated to one of the first quick connectors, start the air pressure device, and transmit the air pressure to the low-pressure side of the level gauge to be calibrated through the balance water tank and the first water outlet pipe. Turn off the air pressure device, and test the pipeline connecting the low-pressure side of the level gauge to be calibrated to the first quick connector. If a leak is detected, repair the leak.

[0026] Perform an airtightness check on the high-pressure side of the level gauge to be calibrated, specifically including:

[0027] Connect the high-pressure side of the level gauge to be calibrated to one of the second quick connectors, start the air pressure device, and transmit the air pressure to the high-pressure side of the level gauge to be calibrated through the calibration water tank and the second outlet pipe. Turn off the air pressure device and test the pipeline connecting the high-pressure side of the level gauge to be calibrated to the second quick connector. If a leak is detected, repair the leak.

[0028] S2: Add water to the balance tank, start the air pressure device, and pressurize the water in the balance tank into the balance tank connected to the low-pressure side of the level gauge to be calibrated. After the water level in the balance tank is maintained at the midline, turn off the air pressure device. Check the pipeline connected to the low-pressure side of the level gauge to be calibrated and the first quick connector. If a leak is detected, repair the leak.

[0029] S3: Add water to the calibration tank, connect one end of the calibration hose to the third quick connector, and lift the other end of the calibration hose. Activate the air pressure device to pressurize the water in the calibration tank to the high-pressure side of the level gauge to be calibrated. Once the water level in the calibration hose is level with the center line of the balance tank connected to the level gauge to be calibrated, close the air pressure device. Check if the zero-point display of the level gauge to be calibrated is correct and record it. Sequentially lower the hoses until the water level line inside is level with each level test elevation point of the storage tank, and check if the corresponding display of the level gauge to be calibrated is correct and record it. After closing the air pressure device, the following steps are also included: inspect the pipeline connecting the high-pressure side of the level gauge to be calibrated to the second quick connector. If a leak is detected, interrupt the calibration test and repair the leak. After the leak is repaired, continue the calibration test.

[0030] The pipeline connecting the low-pressure side of the level gauge to be calibrated to the first quick connector is inspected. If a leak is detected, the leak is repaired, specifically including:

[0031] Observe the reading of the first pressure / level gauge. If the reading decreases, close each of the first quick-connect fittings in sequence. If the reading of the first pressure / level gauge stops decreasing or the rate of decrease slows down after one or more of the first quick-connect fittings are closed, repair any leaks in the pipelines connected to the low-pressure side of the corresponding level gauge to be calibrated.

[0032] The pipeline connecting the high-pressure side of the level gauge to be calibrated and the second quick connector is inspected. If a leak is detected, the leak is repaired, specifically including:

[0033] Observe the reading of the second pressure / level gauge. If the reading decreases, close each of the second quick-connect fittings in sequence. If the reading of the second pressure / level gauge stops decreasing or the rate of decrease slows down after one or more of the second quick-connect fittings are closed, repair any leaks in the pipelines connected to the high-pressure side of the corresponding level gauge to be calibrated.

[0034] Optionally, a fourth quick connector is also provided on the first water outlet pipe.

[0035] In step S2, before activating the pneumatic device, the procedure further includes: connecting one end of the calibration hose to the fourth quick connector, and lifting the other end of the calibration hose.

[0036] In step S2, water in the balance tank is pumped into the balance tank connected to the low-pressure side of the level gauge to be calibrated until the water level in the calibration hose is level with the elevation of the upper source point of the storage tank. Then it is determined that the water level in the balance tank is maintained on its midline.

[0037] In step S3, water from the calibration tank is pumped into the high-pressure side of the level gauge to be calibrated until the water level in the calibration hose is level with the elevation of the upper source point of the storage tank. Then it is determined that the water level in the calibration hose is level with the midline of the balance tank connected to the level gauge to be calibrated.

[0038] Optionally, in step S2, after testing the pipeline connecting the low-pressure side of the level gauge to be calibrated to the first quick connector, the method further includes: closing each first quick connector.

[0039] In step S3, if the display of a certain level gauge to be calibrated is abnormal, such that the difference between its display and the display of other level gauges to be calibrated exceeds a set value, and no leak is found in the pipeline connected to the high-pressure side of the abnormal level gauge and the second quick connector, then the first quick connector connected to the abnormal level gauge to be calibrated is opened, and the pipeline connected to the low-pressure side of the abnormal level gauge and the first quick connector is inspected. If a leak is detected, the leak is repaired.

[0040] Optionally, the tank level channel measurement and calibration test device further includes a local level indicating mechanism. The local level indicating mechanism includes a calibration component and a measurement component. The measurement component can be installed on the tank or connected between the tank and a vertical wall near the tank. It is used to measure the elevation of the upper and lower sampling points of the tank to the vertical wall. The calibration component includes a calibration ruler and a pulley. Both the calibration ruler and the pulley are used to be installed on the vertical wall. The calibration hose passes around the pulley. The elevation point of the upper and lower sampling points of the tank measured to the vertical wall is located between the minimum reading line and the maximum reading line of the calibration ruler.

[0041] Before step S1, the following is also included:

[0042] The elevation measurement unit is installed on the storage tank, or connected between the storage tank and a nearby vertical wall, to transfer the elevation of the upper and lower reference points of the storage tank to the nearby vertical wall.

[0043] Install the pulley on the vertical wall, and pass the free end of the calibration hose around the pulley. Install the calibration ruler on the vertical wall so that the elevation point of the upper and lower sampling points of the tank on the vertical wall is located between the minimum and maximum reading lines of the calibration ruler. Based on the elevation points of the upper and lower sampling points of the tank on the vertical wall and the scale of the calibration ruler, find the various liquid level test elevation points of the tank on the calibration ruler.

[0044] This invention designs a tank level channel measurement and calibration test device including a balance tank, a calibration tank, and a calibration hose. Pressure / level gauges and multiple quick-connectors are installed on the outlet pipes at the lower ends of both the balance tank and the calibration tank. The quick-connector connected to the balance tank connects to the low-pressure side of the level gauge to be calibrated, while the quick-connector connected to the calibration tank connects to the high-pressure side of the level gauge. Additionally, another quick-connector is installed on the outlet pipe at the lower end of the calibration tank to connect to the calibration hose. The test apparatus is connected by a fixed pipe, and both the balance tank and the calibration tank are connected to a pneumatic device. The unique loop pipeline design of the above-mentioned test apparatus can realize the functions of airtightness inspection of relevant instrument pipelines before testing, water filling of the balance tank, calibration, real-time rapid monitoring of leakage, and isolation of leakage pipelines. In addition, the water tank filled with water is inflated by the pneumatic device, so that the water in the tank is filled into the negative pressure side or positive pressure side of the corresponding instrument, thereby avoiding the phenomenon that air bubbles are easily generated when using a hand pump to directly pump water in the existing method. Attached Figure Description

[0045] Figure 1 A schematic diagram of the test for calibrating the liquid level channel of an existing storage tank;

[0046] Figure 2 This is a schematic diagram of the application structure of the tank liquid level channel measurement and calibration test device provided in Embodiment 1 of the present invention;

[0047] Figure 3 This is a three-dimensional structural diagram of the water spraying calibration mechanism in Embodiment 1 of the present invention;

[0048] Figure 4 This is a schematic diagram of the planar structure of the local liquid level indicator mechanism in Embodiment 1 of the present invention. Detailed Implementation

[0049] The technical solutions of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort are within the scope of the invention.

[0050] In the description of this invention, it should be noted that the use of terms such as "above" to indicate orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0051] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] This invention provides a calibration test device for measuring the liquid level channel of a storage tank, comprising: a balance water tank, a calibration water tank, and a calibration hose.

[0054] The lower end of the balancing water tank is connected to a first outlet pipe, which is equipped with a first pressure / level gauge and multiple first quick connectors. These quick connectors are used to connect to the low-pressure side of one of the level gauges to be calibrated via a pipeline. The lower end of the calibration water tank is connected to a second outlet pipe, which is equipped with a second pressure / level gauge, a third quick connector, and multiple second quick connectors. These second quick connectors are used to connect to the high-pressure side of one of the level gauges to be calibrated via a pipeline.

[0055] The upper ends of both the balance tank and the calibration tank are connected to a pneumatic device. This pneumatic device transmits air pressure to the low-pressure side of the level gauge to be calibrated via the balance tank and the first outlet pipe. It also transmits air pressure to the high-pressure side of the level gauge via the calibration tank and the second outlet pipe. Furthermore, it pressurizes water from the balance tank into a balance tank connected to the low-pressure side of the level gauge to be calibrated, and pressurizes water from the calibration tank to the high-pressure side of the level gauge to be calibrated. A first pressure / level gauge monitors the pressure of the first outlet pipe, and a second pressure / level gauge monitors the pressure of the second outlet pipe.

[0056] The calibration hose has a connecting end and a free end. The connecting end is used to connect with the third quick connector, and the free end can be raised or lowered under external force until the water level inside the hose is level with the various liquid level test elevation points of the storage tank.

[0057] The present invention also provides a test method for measuring and calibrating the liquid level channel of a storage tank using the above-mentioned test apparatus, comprising the following steps:

[0058] S1: Perform an airtightness check on the low-pressure side and high-pressure side of the level gauge to be calibrated.

[0059] Perform an airtightness check on the low-pressure side of the level gauge to be calibrated, specifically including:

[0060] Connect the low-pressure side of the level gauge to be calibrated to one of the first quick connectors, start the air pressure device, and transmit the air pressure to the low-pressure side of the level gauge to be calibrated through the balance water tank and the first water outlet pipe. Turn off the air pressure device, and test the pipeline connecting the low-pressure side of the level gauge to be calibrated to the first quick connector. If a leak is detected, repair the leak.

[0061] Perform an airtightness check on the high-pressure side of the level gauge to be calibrated, specifically including:

[0062] Connect the high-pressure side of the level gauge to be calibrated to one of the second quick connectors, start the air pressure device, and transmit the air pressure to the high-pressure side of the level gauge to be calibrated through the calibration water tank and the second outlet pipe. Turn off the air pressure device and test the pipeline connecting the high-pressure side of the level gauge to be calibrated to the second quick connector. If a leak is detected, repair the leak.

[0063] S2: Add water to the balance tank, start the air pressure device, and pressurize the water in the balance tank into the balance tank connected to the low-pressure side of the level gauge to be calibrated. After the water level in the balance tank is maintained at the midline, turn off the air pressure device. Check the pipeline connected to the low-pressure side of the level gauge to be calibrated and the first quick connector. If a leak is detected, repair the leak.

[0064] S3: Add water to the calibration tank, connect one end of the calibration hose to the third quick connector, and lift the other end of the calibration hose. Activate the air pressure device to pressurize the water in the calibration tank to the high-pressure side of the level gauge to be calibrated. Once the water level in the calibration hose is level with the center line of the balance tank connected to the level gauge to be calibrated, close the air pressure device. Check if the zero-point display of the level gauge to be calibrated is correct and record it. Sequentially lower the hoses until the water level line inside is level with each level test elevation point of the storage tank, and check if the corresponding display of the level gauge to be calibrated is correct and record it. After closing the air pressure device, the following steps are also included: inspect the pipeline connecting the high-pressure side of the level gauge to be calibrated to the second quick connector. If a leak is detected, interrupt the calibration test and repair the leak. After the leak is repaired, continue the calibration test.

[0065] The pipeline connecting the low-pressure side of the level gauge to be calibrated to the first quick connector is inspected. If a leak is detected, the leak is repaired, specifically including:

[0066] Observe the reading of the first pressure / level gauge. If the reading decreases, close each of the first quick-connect fittings in sequence. If the reading of the first pressure / level gauge stops decreasing or the rate of decrease slows down after one or more of the first quick-connect fittings are closed, repair any leaks in the pipelines connected to the low-pressure side of the corresponding level gauge to be calibrated.

[0067] The pipeline connecting the high-pressure side of the level gauge to be calibrated and the second quick connector is inspected. If a leak is detected, the leak is repaired, specifically including:

[0068] Observe the reading of the second pressure / level gauge. If the reading decreases, close each of the second quick-connect fittings in sequence. If the reading of the second pressure / level gauge stops decreasing or the rate of decrease slows down after one or more of the second quick-connect fittings are closed, repair any leaks in the pipelines connected to the high-pressure side of the corresponding level gauge to be calibrated.

[0069] Example 1:

[0070] like Figure 2 As shown, this embodiment provides a tank level channel measurement and calibration test device, including: a balance water tank 1, a calibration water tank 2, and a calibration hose 4.

[0071] like Figure 3 As shown, the lower end of the balance water tank 1 is connected to a first outlet pipe 11. The first outlet pipe 11 is equipped with a first pressure / level gauge 12 and multiple first quick connectors 13. The first quick connectors 13 are used to connect to the low-pressure side of one of the level gauges 100 to be calibrated via a pipeline. The lower end of the calibration water tank 2 is connected to a second outlet pipe 21. The second outlet pipe 21 is equipped with a second pressure / level gauge 22, a third quick connector 24, and multiple second quick connectors 23. The second quick connectors 23 are used to connect to the high-pressure side of one of the level gauges 100 to be calibrated via a pipeline.

[0072] The upper ends of both the balance tank 1 and the calibration tank 2 are connected to a pneumatic device 8. The pneumatic device 8 transmits pneumatic pressure to the low-pressure side of the level gauge 100 to be calibrated via the balance tank 1 and the first outlet pipe 11. It also transmits pneumatic pressure to the high-pressure side of the level gauge 100 via the calibration tank 2 and the second outlet pipe 21. Furthermore, it pressurizes water from the balance tank 1 into the balance tank 400 connected to the low-pressure side of the level gauge 100, and pressurizes water from the calibration tank 2 to the high-pressure side of the level gauge 100. A first pressure / level gauge 12 monitors the pressure of the first outlet pipe 11, and a second pressure / level gauge 22 monitors the pressure of the second outlet pipe 21.

[0073] The calibration hose 4 has a connecting end and a free end. The connecting end is used to connect to the third quick connector 24, and the free end can be raised or lowered under external force until the water level inside the hose is level with the various liquid level test elevations of the storage tank 200.

[0074] The unique loop pipeline design of the above-mentioned test device enables pre-test airtightness checks on relevant instrument pipelines, water filling of the balance tank, calibration, real-time rapid monitoring of leaks, and individual isolation of leaking pipelines. Furthermore, by using a pneumatic device to inflate the water tank, the water in the tank is filled into the corresponding instrument's negative or positive pressure side, thus avoiding the phenomenon of air bubbles easily generated when using a hand pump to directly pump water in existing methods.

[0075] The specific implementation process of each of the above functions is described below:

[0076] 1) Air tightness check: This includes checking the air tightness of both the low-pressure and high-pressure sides of the level gauge 100 to be calibrated.

[0077] Perform an airtightness check on the low-pressure side of the level gauge 100 to be calibrated, specifically including:

[0078] Connect the low-pressure side of the level gauge 100 to be calibrated to one of the first quick connectors 13, start the air pressure device 8, and transmit air pressure to the low-pressure side of the level gauge 100 to be calibrated through the balance water tank 1 and the first water outlet pipe 11. Turn off the air pressure device 8, and test the pipeline connecting the low-pressure side of the level gauge 100 to be calibrated to the first quick connector 13. If a leak is detected, repair the leak.

[0079] Perform an airtightness check on the high-pressure side of the level gauge 100 to be calibrated, specifically including:

[0080] Connect the high-pressure side of the level gauge 100 to be calibrated to one of the second quick connectors 23, start the air pressure device 8, and transmit air pressure to the high-pressure side of the level gauge 100 to be calibrated through the calibration water tank 2 and the second water outlet pipe 21. Turn off the air pressure device 8, and test the pipeline connecting the high-pressure side of the level gauge 100 to be calibrated to the second quick connector 23. If a leak is detected, repair the leak.

[0081] 2) Balance tank filling function: Add water to the balance tank 1, start the air pressure device 8, and pressurize the water in the balance tank 1 into the balance tank 400 connected to the low-pressure side of the level gauge 100 to be calibrated. After the water level in the balance tank 400 is maintained at the midline, turn off the air pressure device 8. Check the pipeline connected to the low-pressure side of the level gauge 100 to be calibrated and the first quick connector 13. If a leak is detected, repair the leak.

[0082] 3) Calibration function: Add water to the calibration water tank 2, connect one end of the calibration hose 4 to the third quick connector 24, and lift the other end of the calibration hose 4. Activate the air pressure device 8 to pressurize the water in the calibration water tank 2 to the high-pressure side of the level gauge 100 to be calibrated, until the water level in the calibration hose 4 is level with the center line of the balance tank 400 connected to the level gauge 100 to be calibrated. Then close the air pressure device 8 and check the zero-point display of the level gauge 100 to be calibrated. Check if it is correct and record it; sequentially lower the hose until the water level line of the water body inside is level with the various liquid level test elevation points of the storage tank 200, and check whether the corresponding display of the liquid level instrument 100 to be calibrated is correct, and record it; after turning off the air pressure device 8, it also includes: checking the pipeline connecting the high pressure side of the liquid level instrument 100 to be calibrated to the second quick connector 23. If a leak is detected, interrupt the calibration test and repair the leak. After the leak is repaired, continue the calibration test.

[0083] 4) Real-time and rapid monitoring of leaks and the ability to isolate leaking pipelines:

[0084] The pipeline connecting the low-pressure side of the level gauge 100 to the first quick connector 13 is inspected. If a leak is detected, it is repaired, including:

[0085] Observe the reading of the first pressure / level gauge 12. If the reading decreases, close each of the first quick connectors 13 in sequence. If the reading of the first pressure / level gauge 12 stops decreasing or the rate of decrease slows down after one or more of the first quick connectors 13 are closed, repair the leaks in the pipelines connected to the low-pressure side of the corresponding level instrument 100 to be calibrated.

[0086] The pipeline connecting the high-pressure side of the level gauge 100 to the second quick connector 23 is inspected. If a leak is detected, it is repaired, including:

[0087] Observe the reading of the second pressure / level gauge 22. If the reading decreases, close each of the second quick connectors 23 in sequence. If the reading of the second pressure / level gauge 22 stops decreasing or the rate of decrease slows down after one or more of the second quick connectors 23 are closed, repair any leaks in the pipelines connected to the high-pressure side of the corresponding level instrument 100 to be calibrated by the one or more second quick connectors 23.

[0088] In summary, the independent positive and negative pressure pipelines and pressure / level instruments enable real-time and rapid monitoring of leaks. Quick-connect couplings are used to connect or isolate each pipeline, allowing for individual isolation of leaks detected during testing and separate water replenishment after leak repair, thereby improving testing efficiency and eliminating the need to re-water and vent all pipelines.

[0089] In this embodiment, the first water outlet pipe 11 is also provided with a fourth quick connector 14, which is used to connect with the connection end of the calibration hose 4. When the connection end of the calibration hose 4 is connected with the fourth quick connector 14, its free end can be lifted or lowered under the action of external force until the water level of the water body inside is level with the elevation of the upper source point of the storage tank 200.

[0090] Thus, the water level in the balance tank 400 can be simulated to be maintained at its midline through the fourth quick connector 14 and the calibration hose 4. That is, when water in the balance tank 1 is pumped into the balance tank 400, which is connected to the low-pressure side of the level gauge 100 to be calibrated, until the water level in the calibration hose 4 is level with the elevation of the upper source point of the storage tank 200, it is considered that the water level in the balance tank 400 is maintained at its midline.

[0091] In this embodiment, the first water outlet pipe 11 is also provided with a first water outlet valve 15, and the second water outlet pipe 21 is also provided with a second water outlet valve 25.

[0092] In this embodiment, a water replenishment tank 3 is also included. The water replenishment tank 3 is connected to the air pressure device 8. The balance water tank 1 and the calibration water tank 2 are respectively connected to the water replenishment tank 3. A first water replenishment valve 18 is provided on the pipeline connecting the balance water tank 1 and the water replenishment tank 3. A second water replenishment valve 28 is provided on the pipeline connecting the calibration water tank 2 and the water replenishment tank 3. A water replenishment port is provided at the upper end of the water replenishment tank 3, and a cover 9 is provided to open or close the water replenishment port; and / or,

[0093] The upper end of the balance tank 400 water tank and the instrument calibration water tank 2 is also provided with a water inlet and a cover 9 for opening or closing the water inlet.

[0094] Water tank 3 is used to store backup water so that it can be temporarily replenished when the liquid level in other water tanks is too low during the test.

[0095] This experimental setup is designed to replenish water to the balance tank 1 and the calibration tank 2 in two ways: one is to use the air pressure device 8 to pressurize the water in the replenishment tank 3 into the balance tank 1 and the calibration tank 2, and the other is to replenish water directly through the water inlet.

[0096] In this embodiment, the balance water tank 1, the calibration water tank 2, and the replenishment water tank 3 are all mounted on a mobile trolley 5 to facilitate the transportation of the aforementioned replenishment calibration mechanism.

[0097] In this embodiment, the upper end of the balance water tank 1 is provided with a first air inlet pipe 16 for connecting to the air pressure device 8, and a first air inlet valve 17 is provided on the first air inlet pipe 16.

[0098] The upper end of the calibration water tank 2 is provided with a second air inlet pipe 26 for connecting to the air pressure device 8, and a second air inlet valve 27 is provided on the second air inlet pipe 26;

[0099] The upper end of the water tank 3 is provided with a third air inlet pipe 31 for connecting to the air pressure device 8, and a third air inlet valve 32 is provided on the third air inlet pipe 31.

[0100] The air pressure device 8 and each air inlet valve are doubly redundant to prevent excessive pressure from damaging the liquid level gauge.

[0101] In addition, existing tests for calibrating tank level channels have the following problems:

[0102] The evaporator is located in an evaporator compartment. During the test, the compartment has a lot of scaffolding, which restricts the space for personnel to move around and makes it inconvenient to move. Before the test, a tape measure needs to be hung on a platform at a high position on the evaporator to measure the liquid level in the tubing. A weight is also hung at the lower end of the tape measure to ensure that the tape measure hangs down. However, due to the environment of the evaporator compartment, it is not possible to set the tape measure efficiently and quickly. On the other hand, the tape measure inevitably has a tilt deviation, which leads to errors in reading the liquid level in the tubing. In addition, the evaporator tank is more than 20m high, and the tubing, which is more than 10 meters high, is very heavy. During the test, multiple people need to work together to pull the tubing close to the pre-set tape measure to a specific height in order to observe and record the liquid level in the tubing. The test is physically demanding and there are safety risks associated with working at height.

[0103] As shown in Figure 4, the test apparatus in this embodiment further includes a local liquid level indicating mechanism. The local liquid level indicating mechanism includes a calibration component and a measurement component. The measurement component is located on the storage tank 200 or connected between the storage tank 200 and the vertical wall 300 near the storage tank 200. It is used to measure the elevation of the upper and lower sampling points of the storage tank 200 to the vertical wall 300. The calibration component includes a calibration ruler 6 and a pulley 7. Both the calibration ruler 6 and the pulley 7 are used to be installed on the vertical wall 300. The free end of the calibration tubing 4 passes around the pulley 7. The elevation point of the upper and lower sampling points of the storage tank 200 measured to the vertical wall 300 is located between the minimum reading scale line and the maximum reading scale line of the calibration ruler 6.

[0104] Therefore, by elevating the source point elevation to a conveniently located vertical wall near the outside of the evaporator compartment, the existing methods of setting plumb lines and vertical measuring tapes within the evaporator compartment are integrated into a local liquid level indicator mechanism. This eliminates the inconvenience caused by the surrounding environment of the evaporator layout to the measurement of test readings. The pulley design facilitates the lifting of the hose to change the liquid level height within it, and the reading and hose-pulling operations can be combined into one person's work. Thus, this invention enables convenient operation and reading of the hose liquid level, solving the safety risks of climbing up and down the evaporator pit in existing methods, and the optimized operation significantly improves the accuracy of the readings.

[0105] In this embodiment,

[0106] The elevation measurement assembly includes an upper laser locator and a lower laser locator. The upper laser locator is installed at the position on the storage tank 200 corresponding to the upper elevation point, and is used to transfer the elevation of the upper elevation point of the storage tank 200 to the vertical wall 300. The lower laser locator is installed at the position on the storage tank 200 corresponding to the lower elevation point, and is used to transfer the elevation of the lower elevation point of the storage tank 200 to the vertical wall 300; or,

[0107] The elevation measurement assembly includes an upper connector and a lower connector. One end of the upper connector is connected to the water inlet pipe corresponding to the upper source point of the storage tank 200, and the other end is installed on the vertical wall 300. The upper connector is used to measure the elevation of the upper source point of the storage tank 200 to the vertical wall 300. One end of the lower connector is connected to the water inlet pipe corresponding to the lower source point of the storage tank 200, and the other end is installed on the vertical wall 300. The lower connector is used to measure the elevation of the lower source point of the storage tank 200 to the vertical wall 300.

[0108] Example 2:

[0109] This embodiment provides a test method for measuring and calibrating the liquid level channel of a storage tank using the test apparatus of Embodiment 1, including the following steps:

[0110] S1: Perform an airtightness check on the low-pressure side and high-pressure side of the level gauge 100 to be calibrated.

[0111] Perform an airtightness check on the low-pressure side of the level gauge 100 to be calibrated, specifically including:

[0112] Connect the low-pressure side of the level gauge 100 to be calibrated to one of the first quick connectors 13, start the air pressure device 8, and transmit air pressure to the low-pressure side of the level gauge 100 to be calibrated through the balance water tank 1 and the first water outlet pipe 11. Turn off the air pressure device 8, and test the pipeline connecting the low-pressure side of the level gauge 100 to be calibrated to the first quick connector 13. If a leak is detected, repair the leak.

[0113] Perform an airtightness check on the high-pressure side of the level gauge 100 to be calibrated, specifically including:

[0114] Connect the high-pressure side of the level gauge 100 to be calibrated to one of the second quick connectors 23, start the air pressure device 8, and transmit the air pressure to the high-pressure side of the level gauge 100 to be calibrated through the calibration water tank 2 and the second water outlet pipe 21. Turn off the air pressure device 8, and test the pipeline connecting the high-pressure side of the level gauge 100 to be calibrated to the second quick connector 23. If a leak is detected, repair the leak.

[0115] S2: Add water to the balance tank 1, start the air pressure device 8, and pressurize the water in the balance tank 1 into the balance tank 400 connected to the low-pressure side of the level gauge 100 to be calibrated. After the water level in the balance tank 400 is maintained at the midline, turn off the air pressure device 8. Check the pipeline connected to the low-pressure side of the level gauge 100 to be calibrated and the first quick connector 13. If a leak is detected, repair the leak.

[0116] S3: Add water to the calibration water tank 2, connect one end of the calibration hose 4 to the third quick connector 24, and lift the other end of the calibration hose 4. Activate the air pressure device 8 to pressurize the water in the calibration water tank 2 to the high-pressure side of the level gauge 100 to be calibrated, until the water level in the calibration hose 4 is level with the center line of the balance tank 400 connected to the level gauge 100 to be calibrated. Then close the air pressure device 8 and check if the zero-point display of the level gauge 100 to be calibrated is correct. Confirm and record; sequentially lower the hose until the water level line of the water body inside is level with each liquid level test elevation point of the storage tank 200, and check whether the corresponding display of the liquid level instrument 100 to be calibrated is correct, and record; after closing the air pressure device 8, it also includes: inspecting the pipeline connecting the high pressure side of the liquid level instrument 100 to be calibrated to the second quick connector 23. If a leak is detected, interrupt the calibration test and repair the leak. After the leak is repaired, continue the calibration test;

[0117] The pipeline connecting the low-pressure side of the level gauge 100 to the first quick connector 13 is inspected. If a leak is detected, it is repaired, including:

[0118] Observe the reading of the first pressure / level gauge 12. If the reading decreases, close each of the first quick connectors 13 in sequence. If the reading of the first pressure / level gauge 12 stops decreasing or the rate of decrease slows down after one or more of the first quick connectors 13 are closed, repair the leaks in the pipelines connected to the low-pressure side of the corresponding level instrument 100 to be calibrated.

[0119] The pipeline connecting the high-pressure side of the level gauge 100 to the second quick connector 23 is inspected. If a leak is detected, it is repaired, including:

[0120] Observe the reading of the second pressure / level gauge 22. If the reading decreases, close each of the second quick connectors 23 in sequence. If the reading of the second pressure / level gauge 22 stops decreasing or the rate of decrease slows down after one or more of the second quick connectors 23 are closed, repair any leaks in the pipelines connected to the high-pressure side of the corresponding level instrument 100 to be calibrated by the one or more second quick connectors 23.

[0121] In this embodiment,

[0122] In step S2, before activating the pneumatic device 8, the procedure further includes: connecting one end of the calibration hose 4 to the fourth quick connector 14, and lifting the other end of the calibration hose 4.

[0123] In step S2, water in the balance tank 1 is pumped into the balance tank 400 connected to the low-pressure side of the level gauge 100 to be calibrated, until the water level in the calibration hose 4 is level with the elevation of the upper source point of the storage tank 200. Then it is determined that the water level in the balance tank 400 is maintained on its midline.

[0124] In step S3, water from the calibration tank 2 is pumped into the high-pressure side of the level gauge 100 to be calibrated until the water level in the calibration hose 4 is level with the elevation of the upper source point of the storage tank 200. Then it is determined that the water level in the calibration hose 4 is level with the midline of the balance tank 400 connected to the level gauge 100 to be calibrated.

[0125] In actual operation, water is pumped until the liquid level in the calibration hose is close to the center line of the balance tank, then pumped for a while and then stopped. In addition, when water in balance tank 1 is pumped into the corresponding calibration line, and when water in calibration tank 2 is pumped into the corresponding calibration line, the air venting of the level gauge must be checked. That is, the gauge is vented while water is pumped to ensure that there is no air in the gauge line.

[0126] In this embodiment, after testing the pipeline connected to the low-pressure side of the level gauge 100 to be calibrated and the first quick connector 13 in step S2, the method further includes: closing each of the first quick connectors 13.

[0127] In step S3, if the display of a certain level gauge 100 to be calibrated is abnormal, such that the difference between its display and the display of other level gauges 100 to be calibrated exceeds a set value, and no leak is found in the pipeline connected to the high-pressure side of the abnormal level gauge 100 to be calibrated and the second quick connector 23, then the first quick connector 13 connected to the abnormal level gauge 100 to be calibrated is opened, and the pipeline connected to the low-pressure side of the abnormal level gauge 100 to be calibrated and the first quick connector 13 is inspected. If a leak is detected, the leak is repaired.

[0128] Before step S1, the following is also included:

[0129] The elevation measurement component is installed on the storage tank 200, or connected between the storage tank 200 and the vertical wall 300 near the storage tank 200, to transfer the elevation of the upper and lower reference points of the storage tank 200 to the vertical wall 300 near the storage tank 200.

[0130] Install pulley 7 on vertical wall 300, and pass the free end of calibration hose 4 around pulley 7. Install calibration ruler 6 on vertical wall 300 so that the elevation of the upper and lower source points of storage tank 200 on vertical wall 300 is located between the minimum and maximum reading scale lines of calibration ruler 6. Based on the elevation of the upper and lower source points of storage tank 200 on vertical wall 300 and the scale of calibration ruler 6, find the various liquid level test elevation points of storage tank 200 on calibration ruler 6.

[0131] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A tank level access measurement calibration test apparatus, characterized by, The utility model relates to a kind of water level gauge calibration device, including: Balance water tank (1), calibration water tank (2) and calibration hose (4), The lower end of the balance water tank (1) is connected with first water outlet pipe (11), first water outlet pipe (11) is equipped with first pressure / liquid level table (12) and multiple first quick connector (13), first quick connector (13) is used to be connected with the low pressure side of one of the liquid level instrument (100) to be calibrated by pipeline, the lower end of the calibration water tank (2) is connected with second water outlet pipe (21), second water outlet pipe (21) is equipped with second pressure / liquid level table (22), third quick connector (24) and multiple second quick connector (23), second quick connector (23) is used to be connected with the high pressure side of one of the liquid level instrument (100) to be calibrated by pipeline, The upper end of the balance water tank (1) and the upper end of calibration water tank (2) are connected with a gas pressure device (8), the gas pressure device (8) is used to transmit gas pressure to the low pressure side of the liquid level instrument (100) to be calibrated by balance water tank (1) and first water outlet pipe (11), also used to transmit gas pressure to the high pressure side of the liquid level instrument (100) to be calibrated by calibration water tank (2) and second water outlet pipe (21), also used to press the water in balance water tank (1) into balance tank (400) connected with the low pressure side of the liquid level instrument (100) to be calibrated, also used to press the water in calibration water tank (2) to the high pressure side of the liquid level instrument (100) to be calibrated, first pressure / liquid level table (12) is used to monitor the pressure of first water outlet pipe (11), second pressure / liquid level table (22) is used to monitor the pressure of second water outlet pipe (21), The calibration hose (4) has a connection end and a free end, the connection end is used to be connected with the third quick connector (24), and the free end can be lifted or lowered to the level of the water body in the calibration hose (4) to be flush with each liquid level test elevation point of the storage tank (200) under the action of external force.

2. The tank level access measurement calibration test apparatus of claim 1, wherein, The first water outlet pipe (11) is also provided with a fourth quick connector (14) for communication with the connection end of the calibration hose (4), and when the connection end of the calibration hose (4) is in communication with the fourth quick connector (14), the free end can be lifted or lowered to the level of the water body in the calibration hose (4) to be flush with the elevation of the upper source point of the storage tank (200) under the action of external force.

3. The tank gauging calibration test set of claim 1, wherein, The first water outlet pipe (11) is also provided with a first water outlet valve (15), and the second water outlet pipe (21) is also provided with a second water outlet valve (25).

4. The tank gauging calibration test set of claim 1, wherein, The utility model also includes a water replenishing tank (3), the water replenishing tank (3) is connected with the gas pressure device (8), the balance water tank (1) and the calibration water tank (2) are in communication with the water replenishing tank (3), the upper end of the water replenishing tank (3) is provided with a water replenishing opening, and a cover (9) is arranged to open or close the water replenishing opening; and / or The upper end of the balance tank (400) and the calibration water tank (2) is also provided with a water replenishing opening, and a cover (9) is arranged to open or close the water replenishing opening.

5. The tank level access measurement calibration test apparatus of claim 4, wherein, The balance water tank (1), the calibration water tank (2) and the water replenishing tank (3) are arranged on a mobile trolley (5).

6. The tank level access measurement calibration test apparatus of claim 5, wherein, The upper end of the balance water tank (1) is provided with a first air inlet pipe (16) connected with the air pressure device (8), and the first air inlet pipe (16) is provided with a first air inlet valve (17); The upper end of the calibration water tank (2) is provided with a second air inlet pipe (26) connected with the air pressure device (8), and the second air inlet pipe (26) is provided with a second air inlet valve (27); The upper end of the water supplement tank (3) is provided with a third air inlet pipe (31) connected with the air pressure device (8), and the third air inlet pipe (31) is provided with a third air inlet valve (32).

7. A tank level access calibration test apparatus according to any one of claims 1 to 6, wherein, Further comprising a local liquid level indicating mechanism, the local liquid level indicating mechanism comprises a calibration assembly and a tracing assembly, the tracing assembly is arranged on the storage tank (200), or connected between the storage tank (200) and a vertical wall (300) near the storage tank (200), and is used for tracing the elevations of the upper and lower source points of the storage tank (200) to the vertical wall (300), the calibration assembly comprises a calibration scale (6) and a pulley (7), and the calibration scale (6) and the pulley (7) are both arranged on the vertical wall (300), and the free end of the calibration hose (4) passes through the pulley (7) and is traced to the vertical wall (300), and the elevation points of the upper and lower source points of the storage tank (200) on the vertical wall (300) are located between the minimum reading scale line and the maximum reading scale line of the calibration scale (6).

8. The storage tank liquid level channel calibration test device according to claim 7, wherein, the tracing assembly comprises an upper laser positioner and a lower laser positioner, the upper laser positioner is arranged at a position corresponding to the upper source point of the storage tank (200), and is used for tracing the elevation of the upper source point of the storage tank (200) to the vertical wall (300), and the lower laser positioner is arranged at a position corresponding to the lower source point of the storage tank (200), and is used for tracing the elevation of the lower source point of the storage tank (200) to the vertical wall (300); or, the tracing assembly comprises an upper communicating device and a lower communicating device, one end of the upper communicating device is communicated with a water guide pipe corresponding to the upper source point of the storage tank (200), and the other end is arranged on the vertical wall (300), and the upper communicating device is used for tracing the elevation of the upper source point of the storage tank (200) to the vertical wall (300), and one end of the lower communicating device is communicated with a water guide pipe corresponding to the lower source point of the storage tank (200), and the other end is arranged on the vertical wall (300), and the lower communicating device is used for tracing the elevation of the lower source point of the storage tank (200) to the vertical wall (300).

9. A test method for calibrating a tank level passage measurement using the test device according to any one of claims 1 to 8, characterized in that, The steps include: S1: air tightness inspection is performed on the low pressure side and the high pressure side of the liquid level instrument (100) to be calibrated, the air tightness inspection is performed on the low pressure side of the liquid level instrument (100) to be calibrated, and specifically includes: The low pressure side of the liquid level instrument (100) to be calibrated is connected with one of the first quick connectors (13), the air pressure device (8) is started, the air pressure is transmitted to the low pressure side of the liquid level instrument (100) to be calibrated through the balance water tank (1) and the first water outlet pipe (11), the air pressure device (8) is closed, the pipeline connected with the first quick connector (13) on the low pressure side of the liquid level instrument (100) to be calibrated is detected, if a leakage point is detected, the leakage point is repaired; The high pressure side of the liquid level instrument (100) to be calibrated is subjected to airtightness inspection, specifically including: The high pressure side of the liquid level instrument (100) to be calibrated is connected with one of the second quick connectors (23), the air pressure device (8) is started, the air pressure is transmitted to the high pressure side of the liquid level instrument (100) to be calibrated through the calibration water tank (2) and the second water outlet pipe (21), the air pressure device (8) is closed, the pipeline connected with the second quick connector (23) on the high pressure side of the liquid level instrument (100) to be calibrated is detected, if a leakage point is detected, the leakage point is repaired; S2: water is added to the balance water tank (1), the air pressure device (8) is started, the water in the balance water tank (1) is pressed into the balance tank (400) connected with the low pressure side of the liquid level instrument (100) to be calibrated, after the water level in the balance tank (400) is kept on the middle line, the air pressure device (8) is closed, the pipeline connected with the first quick connector (13) on the low pressure side of the liquid level instrument (100) to be calibrated is detected, if a leakage point is detected, the leakage point is repaired; S3: water is added to the calibration water tank (2), one end of the calibration hose (4) is connected with the third quick connector (24), and the other end of the calibration hose (4) is lifted, the air pressure device (8) is started, the water in the calibration water tank (2) is pressed to the high pressure side of the liquid level instrument (100) to be calibrated, after the water level of the water body in the calibration hose (4) is flush with the middle line of the balance tank (400) connected with the liquid level instrument (100) to be calibrated, the air pressure device (8) is closed, whether the zero point display of the liquid level instrument (100) to be calibrated is correct is checked, and a record is made; the hose is sequentially lowered to the water level line of the water body flush with each liquid level test elevation point of the storage tank (200), and whether the corresponding display of the liquid level instrument (100) to be calibrated is correct is checked, and a record is made; after the air pressure device (8) is closed, it further includes: the pipeline connected with the second quick connector (23) on the high pressure side of the liquid level instrument (100) to be calibrated is detected, if a leakage point is detected, the calibration test is interrupted and the leakage point is repaired, after the leakage point is repaired, the calibration test is continued; The pipeline connected with the first quick connector (13) on the low pressure side of the liquid level instrument (100) to be calibrated is detected, if a leakage point is detected, the leakage point is repaired, specifically including: Observing the reading of the first pressure / liquid level gauge (12), if the reading decreases, sequentially close each first quick connector (13), if the reading of the first pressure / liquid level gauge (12) stops decreasing or the decreasing rate slows down after one or more first quick connectors (13) are closed, then repair the leakage point of the pipeline connected to the low pressure side of the liquid level gauge (100) to be calibrated through the one or more first quick connectors (13). The pipeline connected to the high pressure side of the liquid level gauge (100) to be calibrated through the second quick connector (23) is detected, and if a leakage point is detected, the leakage point is repaired, specifically including: Observing the reading of the second pressure / liquid level gauge (22), if the reading decreases, sequentially close each second quick connector (23), if the reading of the second pressure / liquid level gauge (22) stops decreasing or the decreasing rate slows down after one or more second quick connectors (23) are closed, then repair the leakage point of the pipeline connected to the high pressure side of the liquid level gauge (100) to be calibrated through the one or more second quick connectors (23).

10. The test method for tank level access measurement calibration according to claim 9, characterized in that, The fourth quick connector (14) is further arranged on the first outlet pipe (11), In step S2, before starting the air pressure device (8), further including: connecting one end of the calibration hose (4) to the fourth quick connector (14), and lifting the other end of the calibration hose (4), In step S2, the water in the balance tank (1) is pressed into the balance tank (400) connected to the low pressure side of the liquid level gauge (100) to be calibrated, until the water level of the water body in the calibration hose (4) is flush with the elevation of the upper source point of the storage tank (200), then it is determined that the water level in the balance tank (400) is kept on the median line. In step S3, the water in the calibration tank (2) is pressed into the high pressure side of the liquid level gauge (100) to be calibrated, until the water level of the water body in the calibration hose (4) is flush with the elevation of the upper source point of the storage tank (200), then it is determined that the water level of the water body in the calibration hose (4) is flush with the median line of the balance tank (400) connected to the liquid level gauge (100) to be calibrated.

11. The test method for tank level access measurement calibration according to claim 9, wherein, In step S2, after detecting the pipeline connected to the low pressure side of the liquid level gauge (100) to be calibrated through the first quick connector (13), further including: closing each first quick connector (13); In step S3, if the display of a certain liquid level gauge (100) to be calibrated is abnormal, and the difference between the display of the liquid level gauge (100) to be calibrated and the display of other liquid level gauges (100) to be calibrated exceeds the set value, and the pipeline connected to the high pressure side of the liquid level gauge (100) to be calibrated through the second quick connector (23) is detected without a leakage point, then open the first quick connector (13) connected to the liquid level gauge (100) to be calibrated, detect the pipeline connected to the low pressure side of the liquid level gauge (100) to be calibrated through the first quick connector (13), and if a leakage point is detected, repair the leakage point.

12. The test method for tank level access measurement calibration according to claim 9, wherein, The tank liquid level channel measurement calibration test device further comprises an in-situ liquid level indication mechanism, the in-situ liquid level indication mechanism comprises a calibration assembly and a measurement assembly, the measurement assembly can be installed on the tank (200), or connected between the tank (200) and a vertical wall (300) near the tank (200), for measuring the elevation of the upper and lower source points of the tank (200) to the vertical wall (300), the calibration assembly comprises a calibration scale (6) and a pulley (7), both of which are used to be installed on the vertical wall (300), the calibration hose (4) passes around the pulley (7), and the elevation point of the upper and lower source points of the tank (200) on the vertical wall (300) is located between the minimum reading scale line and the maximum reading scale line of the calibration scale (6); Before step S1, further comprising: installing the measurement assembly on the tank (200), or connecting between the tank (200) and a vertical wall (300) near the tank (200), to measure the elevation of the upper and lower source points of the tank (200) to the vertical wall (300) near the tank (200), installing the pulley (7) on the vertical wall (300), and passing the free end of the calibration hose (4) around the pulley (7), and installing the calibration scale (6) on the vertical wall (300), so that the elevation point of the upper and lower source points of the tank (200) on the vertical wall (300) is located between the minimum reading scale line and the maximum reading scale line of the calibration scale (6), and according to the elevation point of the upper and lower source points of the tank (200) on the vertical wall (300), and the scale of the calibration scale (6), finding each liquid level test elevation point of the tank (200) on the calibration scale (6).

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