Detection system and method for detecting settlement of crude oil storage tank

Abstract

The detection system comprises a liquid storage barrel, a plurality of detection devices, a liquid passing pipe and a computing device, the liquid storage barrel is used for containing detection liquid, each detection device comprises a main body and a tail cable, a cavity extending in the length direction of the main body is formed in the main body, and the tail cable is arranged in the cavity. A cavity is formed in the main body, a sensor is arranged in the cavity, a tail cable is arranged at the lower end of the main body and connected with the sensor, and the multiple detection devices are communicated through the liquid passing pipes and then connected with the liquid storage barrel, so that detection liquid forms a closed loop between the liquid storage barrel and the multiple detection devices, and sedimentation of the crude oil storage tank can be safely and reliably detected. The device has the advantages of simple and convenient installation and convenient maintenance.

Description

Technical Field

[0001] This invention belongs to the field of petroleum storage technology, and in particular relates to a detection system and method for detecting settlement in crude oil storage tanks. Background Technology

[0002] Storing petroleum is an important safeguard for national production and defense security. However, the flammable nature of petroleum and its products presents challenges for storage. Large storage tanks, in particular, are extremely heavy and their capacity makes them highly vulnerable; if they overturn due to ground subsidence, the consequences can be catastrophic.

[0003] For the monitoring of sedimentation of oil products, current methods mostly rely on electrical sensors installed on storage tanks. However, due to fire safety considerations, the use of electrical sensors for monitoring poses certain safety risks. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a detection system and method for detecting the settlement of crude oil storage tanks, so as to solve the problem that there is a lack of safe and reliable detection equipment in the existing related technologies.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A detection system for detecting settlement in crude oil storage tanks includes multiple detection devices and a storage tank for holding the detection liquid.

[0007] The multiple detection devices are arranged around the circumference of the crude oil storage tank. Some detection devices are installed on the side wall of the crude oil storage tank, some are installed on the base of the crude oil storage tank, and some are installed on the outside of the base.

[0008] The storage tank is used to hold the test liquid. The bottom of the storage tank is equipped with a liquid main interface, which is connected to a liquid flow pipe. All the test devices are connected to the storage tank through the liquid flow pipe.

[0009] Each detection device includes a main body and a tail cable. The main body has a cavity arranged along the flow direction of the fluid. The upper end of the cavity is connected to a liquid inlet, and the lower end of the cavity is connected to a liquid outlet. All liquid outlets are connected to a storage tank through a connecting pipe. The sensor is set in the cavity and connected to the tail cable. The tail cable is connected to a computer.

[0010] A further improvement of the present invention is that:

[0011] Preferably, the plurality of detection devices are evenly distributed on the side wall of the crude oil storage tank.

[0012] Preferably, the detection devices mounted on the base are evenly distributed around the axis of the crude oil storage tank.

[0013] Preferably, the liquid passage includes multiple horizontally arranged transverse flow pipes and multiple vertically arranged longitudinal flow pipes;

[0014] Each longitudinal flow tube has its upper end connected to a liquid inlet of a main body, and each longitudinal flow tube has its lower end connected to a T-joint. Multiple transverse flow tubes are connected to each other through T-joints, and the transverse flow tubes at the edges are connected to the liquid main inlet of the storage tank.

[0015] Preferably, a valve is provided on the longitudinal flow pipe.

[0016] Preferably, each liquid outlet is connected to the connecting pipe via a connector.

[0017] Preferably, the sensor includes a sensing optical fiber and a protective sleeve for the optical fiber, wherein the sensing optical fiber is wrapped by the protective sleeve.

[0018] Preferably, the detection device installed outside the base serves as the reference.

[0019] Preferably, the cavity of the main body is connected to an exhaust valve.

[0020] A detection method based on the detection system for detecting settlement of crude oil storage tanks as described in any one of the above-mentioned methods includes the following steps:

[0021] Step 1: Install the detection device at the designated location on the crude oil storage tank and its base;

[0022] Step 2: Connect multiple crude oil storage tanks and liquid storage containers through liquid inlet pipes;

[0023] Step 3: Pour the test liquid into the storage tank, and the sensor in each testing device will take a measurement.

[0024] Step 4: The computer reads the wavelength of each sensor to obtain the pressure and temperature values, and then calculates the settlement value of the crude oil storage tank.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention discloses a detection system and method for detecting settlement in crude oil storage tanks, comprising a storage tank, multiple detection devices, a liquid inlet pipe, and a computing device. The storage tank contains the detection liquid and has a main liquid inlet. Each detection device includes a main body and a tail cable. The main body has a cavity extending along its length. The upper end of the main body has a liquid inlet communicating with the cavity, and the lower end has a liquid outlet communicating with the cavity. A sensor is located in the cavity. The tail cable is located at the lower end of the main body and connected to the sensor. The multiple detection devices are connected to each other via the liquid inlet pipe and then connected to the main liquid inlet, forming a closed loop between the storage tank and the multiple detection devices. This method can safely and reliably detect the settlement of crude oil storage tanks and has the advantages of simple and convenient installation and maintenance. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the detection device of the detection system for detecting settlement of crude oil storage tanks according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of a detection device for a detection system for detecting settlement of crude oil storage tanks according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the overall structure of a detection system for detecting settlement of crude oil storage tanks according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the distribution structure of a detection system for detecting settlement in a crude oil storage tank according to an embodiment of the present invention, when applied in a crude oil storage tank.

[0031] Among them, 100, detection device; 1, main body; 2, liquid inlet interface; 3, liquid outlet interface; 4, tail cable; 5, exhaust valve; 6, base; 61, screw hole; 7, sensor; 71, sensing fiber optic cable; 72, fiber optic protective sleeve; 8, detection liquid; 9, storage tank; 10, transverse flow pipe; 11, longitudinal flow pipe; 12, connecting pipe; 13, valve; 14, bolt; 15, tee connector; 16, two-way connector; 20, liquid passage pipe; 101, crude oil storage tank; 102, base. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do 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. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0034] Reference Figure 1-4 The present invention provides a detailed description of the detection system and method for detecting settlement in crude oil storage tanks, which are described in the embodiments of the present invention.

[0035] like Figure 1-4 As shown, according to an embodiment of the present invention, a detection system for detecting the settling of a crude oil storage tank 101 is provided. The crude oil storage tank 101 is installed on a base 102 for storing oil. The detection system includes a storage tank 9, multiple detection devices 100, a liquid inlet pipe 20, and a computing device. The storage tank 9 is used to contain the detection liquid 8, and the storage tank 9 is provided with a liquid main inlet.

[0036] Each of the detection devices 100 includes a main body 1 and a tail cable 4. The main body 1 has a cavity extending along its length, and a detection fluid flows into the cavity. The upper end of the main body 1 has a liquid inlet 2 communicating with the cavity, and the lower end has a liquid outlet 3 communicating with the cavity. A sensor 7 is provided in the cavity, and the sensor 7 is used to detect the pressure and temperature of the detection liquid 8 flowing into the cavity. The tail cable 4 is located at the lower end of the main body 1 and is connected to the sensor 7. The free end of the tail cable 4 is used to connect to a computing device to transmit the pressure and temperature information to the computing device. The multiple detection devices 100 are vertically arranged such that the liquid inlet 2 is higher than the liquid outlet 3 and is evenly distributed on the periphery of the crude oil storage tank 101 and the base 102. The multiple detection devices 100 are connected to the liquid main inlet through the liquid inlet pipe 20. The detection liquid comes out of the storage tank 9 and enters the detection device 100. After passing through the multiple detection devices 100, it flows back into the storage tank 9, so that the detection liquid 8 forms a closed loop between the storage tank 9 and the multiple detection devices 100.

[0037] It should be noted that, as Figure 4 As shown, the crude oil storage tank 101 is generally installed and fixed on the base 102, which is used to support the crude oil storage tank 101 and prevent it from settling. The detection system provided in this embodiment is installed on the side wall of the crude oil storage tank 101 and on the base 102 to detect whether the crude oil storage tank 101 has settled, and to detect whether the base 102 supporting the crude oil storage tank 101 has settled, so as to promptly alert management personnel and avoid danger and property damage caused by settlement.

[0038] In this embodiment, the detection liquid 8 can be pure water. The appropriate detection liquid 8 is filled based on the height relationship between the installed storage tank 9 and each detection device 100. Optionally, antifreeze and preservatives can be added appropriately according to the temperature range of the environment. Other non-flammable, low-volatility, and highly fluid liquids, such as low molecular weight dimethylsilane (silicone oil), can also be used.

[0039] In this embodiment, the closed loop formed between the storage tank 9 and the multiple detection devices 100 can be understood as follows: the detection liquid 8 can flow out from the liquid main interface of the storage tank 9 and enter each detection device 100 sequentially or simultaneously. The loop between each detection device 100 can be connected in series or in parallel, so that the detection liquid 8 in the storage tank 9 can flow into the cavity of each detection device 100.

[0040] It should be noted that the number of detection devices 100 can be selected according to the specific scenario, preferably evenly distributed around the crude oil storage tank 101 that needs to be detected.

[0041] In this embodiment, the computing device is used to calculate the settlement value of the crude oil storage tank 101 based on the received pressure and temperature information. Here, the computing device can be any computer device equipped with a calculation program. After acquiring the pressure and temperature signals of each detection device 100 transmitted by the sensor 7 through the tail cable 4, the computing device performs calculations based on the pressure and temperature signals of each detection device 100 to determine whether the crude oil storage tank 101 or the base 102 has settled. The calculation program can be adaptively set according to the actual environmental scenario of the detection. For example, the absolute height of the pressure and temperature of the detection devices 100 located diagonally or symmetrically to the computer can be used to determine whether settlement has occurred based on the height difference. A more accurate calculation program can also be set based on the information from the detection devices 100 located at different positions. Since the main point of protection in this application is the detection system, not the program, it will not be elaborated further here.

[0042] In one embodiment, the sensor 7 includes a sensing optical fiber 71 connected to the tail cable 4 and an optical fiber protective sleeve 72 enclosing the sensing optical fiber 71. The optical fiber protective sleeve 72 isolates the sensing optical fiber 71 from the liquid. The sensing optical fiber 71 includes an integrated optical fiber stress sensor and an optical fiber temperature sensor for detecting the pressure and temperature of the detection liquid 8, respectively. The tail cable 4 is an optical fiber used to transmit the light signals detected by the optical fiber stress sensor 7 and the optical fiber temperature sensor 7 to a computing device, so that the computing device can convert the pressure and temperature. Here, the optical fiber protective sleeve 72 can be made of a waterproof and insulating material.

[0043] In one embodiment, the detection device 100 further includes an exhaust valve 5, which is located at the upper end of the main body 1 and communicates with the cavity. Thus, when the detection liquid 8 enters the cavity of the detection device 100, the exhaust valve 5 can expel air bubbles from the detection liquid 8 in the cavity of the detection device 100, and simultaneously expel air bubbles from the detection liquid 8 located in the liquid inlet pipe 20.

[0044] In one embodiment, the detection device 100 further includes a base 6, which is connected to the upper end of the main body 1 and is used to connect the storage tank or the base 102. Thus, each detection device 100 can be conveniently installed on the crude oil storage tank 101 and the base 102 via the base 6. For example, the base 102 can be directly bonded to the crude oil storage tank 101, or the base 6 can be fastened to the crude oil storage tank 101 and the base 102 using screws, bolts 14, etc.

[0045] Optionally, the base 6 is provided with screw holes 61, and the detection device 100 is fixed to the storage tank by bolts 14.

[0046] In one embodiment, the liquid main inlet is located at the bottom of the liquid storage tank 9. This facilitates the better flow of the detection liquid 8 from the liquid storage tank 9 into the detection device 100.

[0047] In one embodiment, such as Figure 3 As shown, the liquid flow pipe 20 includes multiple horizontally arranged transverse flow pipes 10, multiple vertically arranged longitudinal flow pipes 11, and a horizontally placed connecting pipe 12. The number of transverse flow pipes 10, longitudinal flow pipes 11, and detection devices 100 are all the same. The upper end of each longitudinal flow pipe 11 is connected to the liquid inlet 2 of a detection device 100. The connecting pipe 12 is provided with multiple connectors, the number of which is equal to the number of detection devices 100. The liquid outlet 3 of each detection device 100 is connected to the connector. The end of the connecting pipe 12 flows back to the storage tank 9. The multiple transverse flow pipes 10 are connected to each other by a T-connector 15. The lower end of each longitudinal flow pipe 11 is connected to the corresponding T-connector 15. The free end of the first transverse flow pipe 10 is connected to the main liquid inlet, and the free end of the last transverse flow pipe 10 is connected to the lower end of the last longitudinal flow pipe 11 by a two-way connector 16. This facilitates the connection between the various detection devices 100, and makes the liquid circuit between the various detection devices 100 more uniform, resulting in more accurate and reliable detection results.

[0048] Optionally, a valve 13 is provided at the top end of the longitudinal flow pipe 11. This allows for better control of the flow of the detection liquid 8 during the connection process, facilitating the installation and debugging of the entire detection system, and also facilitating the removal of air bubbles from the detection device 100 and the liquid flow pipe 20.

[0049] In one specific embodiment, see Figure 4 In practical applications, crude oil storage tank 101 is generally installed and fixed on base 102, which is used to support crude oil storage tank 101 and prevent it from settling. For example... Figure 4 As shown, multiple detection devices 100 can be evenly installed on the side wall of the crude oil storage tank 101, and multiple detection devices 100 can be evenly installed on the base 102 surrounding the crude oil storage tank 101. Each detection device 100 is connected to the liquid interface of the storage tank 9 (not shown in the figure, but can be installed and fixed at any position on the base 102) via a liquid pipe 20, to detect whether the crude oil storage tank 101 or the base 102 supporting the crude oil storage tank 101 has settled. Here, a separate detection device 100 can be installed outside the base 102 as a reference to serve as a reference value (baseline value) for the strategies of each detection device 100. Simultaneously, a fiber optic strain sensor 7 can be added to the crude oil storage tank 101, integrated with the fiber optic network of the detection devices 100.

[0050] According to the embodiments of the present invention, a method for detecting settlement of a crude oil storage tank using the detection system provided in any of the above embodiments is provided, wherein the crude oil storage tank 101 is mounted on a base 102, and the detection method includes:

[0051] Step 1: Fix the storage tank 9 to the base 102, fix some of the detection devices 100 to the periphery of the crude oil storage tank 101, and fix some of the detection devices 100 to the base 102. The detection devices 100 should be evenly distributed around the crude oil storage tank 101.

[0052] Step 2: After connecting multiple detection devices 100 through the liquid inlet pipe 20, connect it to the liquid main interface of the liquid storage tank 9 so that the detection liquid 8 forms a closed loop between the liquid storage tank 9 and the multiple detection devices 100.

[0053] Step 3: Connect a separate detection device 100 to the closed loop. The detection device 100 is located outside the base 102 and is used as a reference sensor 7.

[0054] Step 4: Pour pure water into the storage tank 9. Stop filling the tank when it is about 10 cm away from the opening of the storage tank 9. Expel the air bubbles from the liquid pipe 20 and the cavity, and seal the entire detection system.

[0055] Step 5: The wavelength of the sensor 7 of each of the detection devices 100 is read by the computing device to obtain the values ​​of pressure and temperature;

[0056] Step 6: The calculation device calculates the settlement value of the storage tank based on the pressure and temperature values.

[0057] When installing the detection system of this embodiment, the following methods can be used:

[0058] 1. Install the storage tank 9, ensuring all testing devices 100 are installed at the same elevation. This is crucial before commencing the monitoring procedure. The storage tank 9 is typically installed at the lowest point of the highest point in the test section. After selecting the location, drill two 10mm diameter, 100mm deep holes in the wall of the base 102, with a vertical spacing of 60mm between the two holes. Remove the concrete from the holes, inject anchoring adhesive, and screw two steel nails into the threaded half-clamp. Insert the two clamps into the holes, ensuring they are parallel. Place the storage tank 9 against the two clamps, close the other half of the clamp, and tighten it.

[0059] 2. Connect the liquid inlet pipe 20. The bottom of the liquid storage tank 9 has a liquid outlet, which serves as the starting point of the liquid inlet pipe 20. Run the liquid inlet pipe 20 from the liquid storage tank 9 all the way to the last detection device 100 in the system. Cut the pipe at each detection device 100 to form multiple horizontal flow pipes 10. Insert the pipes into both ends of the tee connector 15. Then insert a vertical flow pipe 11 on top of the pipes and lead them to the installation position of the detection device 100 (leave extra length in the vertical flow pipe 11 and fix it at a higher position). Connect a valve 13 to the top of the pipe.

[0060] 3. System Filling: Fill the system with purified water through the storage tank 9. (If the ambient temperature may drop below zero, add a certain proportion of antifreeze to the purified water.) During operation, first close valves 13 at each detection device 100 position, and only open the last valve 13. To avoid air bubbles in the pipe, fold up the liquid inlet pipe 20 at the bottom of the storage tank 9 (or add another valve 13 and close it first). Stop filling when the water level is about 10 cm from the opening of the storage tank 9, then loosen the fold. Water will begin to flow into the liquid inlet pipe 20. Continue adding water until the liquid level is maintained at 10 cm from the opening of the tank, then close the lid. Check the system's sealing performance and observe whether there is any liquid leakage at any joint. Open all valves 13 and check for air bubbles in all liquid-passing pipes 20. If air bubbles are present, lift the liquid-passing pipe 20 and slowly pull it forward to guide the air bubbles to valve 13 for removal. After confirming that there are no air bubbles in the liquid-passing pipe 20, mark the liquid level on the wall where each detection device 100 is installed. Cut off any excessively long connecting pipes 12 and longitudinal flow pipes 11, then connect valves 13. Connect a 6mm silicone tube to the top, ensuring the silicone tube is higher than the horizontal plane of the storage tank 9, and secure it with clips. Close valves 13. Securely fix the connecting pipes 12 and longitudinal flow pipes 11 to the wall with clips, with a fixing interval of no more than 2 meters.

[0061] 4. Install the detection devices 100. The installation position of each detection device 100 is determined by the liquid level of the connecting pipe 12 at each installation point or by measuring with a total station. Drill two 10mm holes 5cm above and below the horizontal liquid level, place the detection device 100 with the base 6 on top, and lock it in place with expansion bolts. After completing the above work, connect the 6mm silicone tube to the liquid inlet 2 of the detection device 100. The silicone tube should be as short as possible, and should not exceed half a meter. Confirm that the exhaust valve 5 on the top of the detection device 100 is open, then open the water valve 13 to allow the detection liquid 8 to flow into the detection device 100. Air bubbles will be discharged from the exhaust valve 5. After the detection liquid 8 has been continuously flowing out, close the exhaust valve 5. The portable demodulator reads the wavelength of the sensor 7 in the detection device 100. The pressure grating should be 1.0 to 1.5 nm smaller than the wavelength before installation. The base 6 of the detection device 100 has a certain adjustable range. If the wavelength change is too small, the detection device 100 can be lowered. If the wavelength change is too large, the detection device 100 can be raised. Finally, lock it.

[0062] 5. Connect the vent pipes. The purpose of venting is to ensure that all testing devices 100 are under the same pressure (it is generally believed that the air pressure is the same within a small area, but if there is wind, there will be slight differences in air pressure between different measuring points, which will reduce the test accuracy. However, in a near-enclosed, windless space, a vent pipe may not be necessary). Each testing device 100 has an air connector at the bottom, from which a 6mm silicone tube is led out. Then, connect the various testing devices 100 together using an air tee. Note: Do not allow liquids or dirt to enter the silicone tube, which could cause air blockage.

[0063] After installation, a desktop fiber Bragg grating demodulator is used to monitor the detection system (and possibly the fiber optic strain sensor 7). Data from all detection devices 100 are calibrated using their corresponding temperature sensors 7 and then compared with a reference detection device 100 outside the storage tank. When settlement occurs at the location of a detection device 100, the pressure difference caused by the liquid inlet pipe 20 will be reflected in the data of the fiber optic pressure sensor 7. The data from the grating demodulator is processed uniformly by the data center, and the location of each detection device 100 in the crude oil storage tank 101 or its foundation is graphically marked, along with the calculated settlement value. When the settlement exceeds a preset value, a warning is sent to relevant personnel and recorded for easy hazard mitigation.

[0064] Therefore, the detection system and method for detecting settlement of crude oil storage tanks of the present invention can safely and reliably detect the settlement of crude oil storage tanks, and has the advantages of simple and convenient installation and easy maintenance.

[0065] The above description is only a preferred embodiment of the present invention and is 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 detection system for detecting settlement in crude oil storage tanks, characterized in that, It includes multiple detection devices (100) and a storage tank (9) for holding the detection liquid (8); The plurality of detection devices (100) are arranged around the crude oil storage tank (101) in a circumferential manner. Some detection devices (100) are installed on the side wall of the crude oil storage tank (101), some detection devices (100) are installed on the base (102) of the crude oil storage tank (101), and some detection devices (100) are installed outside the base (102). The storage tank (9) is used to hold the test liquid (8). The bottom of the storage tank (9) is provided with a liquid main interface, which is connected to a liquid pipe (20). All the test devices (100) are connected to the storage tank (9) through the liquid pipe (20). Each detection device (100) includes a main body (1) and a tail cable (4). A cavity is provided inside the main body (1) along the flow direction of the fluid. The upper end of the cavity is connected to a liquid inlet (2), and the lower end of the cavity is connected to a liquid outlet (3). All liquid outlets (3) are connected to a storage tank (9) through a connecting pipe (12). A sensor (7) is set in the cavity and is connected to the tail cable (4). The tail cable (4) is connected to a computer.

2. The detection system for detecting settlement in crude oil storage tanks according to claim 1, characterized in that, The multiple detection devices (100) are evenly distributed on the side wall of the crude oil storage tank (101).

3. The detection system for detecting settlement in crude oil storage tanks according to claim 1, characterized in that, The detection devices (100) installed on the base (102) are evenly distributed around the axis of the crude oil storage tank (101).

4. The detection system for detecting settlement in crude oil storage tanks according to claim 1, characterized in that, The liquid passage (20) includes multiple horizontally arranged transverse flow pipes (10) and multiple vertically arranged longitudinal flow pipes (11); The upper end of each longitudinal flow pipe (11) is connected to the liquid inlet (2) of a main body (1), and the lower end of each longitudinal flow pipe (11) is connected to a tee connector (15). Multiple transverse flow pipes (10) are connected to each other through the tee connector (15). The transverse flow pipes (10) at the side are connected to the liquid main inlet of the liquid storage tank (9).

5. A detection system for detecting settlement in crude oil storage tanks according to claim 4, characterized in that, A valve (13) is provided on the longitudinal flow pipe (11).

6. The detection system for detecting settlement in crude oil storage tanks according to claim 3, characterized in that, Each liquid outlet (3) is connected to the connecting pipe (12) via a connector.

7. The detection system for detecting settlement in crude oil storage tanks according to claim 1, characterized in that, The sensor (7) includes a sensing optical fiber (71) and an optical fiber protective sleeve (72), with the sensing optical fiber (71) being wrapped by the optical fiber protective sleeve (72).

8. The detection system for detecting settlement in crude oil storage tanks according to claim 1, characterized in that, The detection device installed outside the base (102) serves as a reference.

9. A detection system for detecting settlement in crude oil storage tanks according to claim 1, characterized in that, The cavity of the main body (1) is connected to an exhaust valve (5).

10. A detection method based on the detection system for detecting settlement of crude oil storage tanks according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Install the detection device (100) at the designated positions on the crude oil storage tank (101) and the base (102); Step 2: Connect multiple crude oil storage tanks (101) and liquid storage tanks (9) through liquid inlet pipes (20); Step 3: Inject the test liquid (8) into the storage tank (9), and the sensor (7) in each test device (100) performs the measurement; Step 4: The computer reads the wavelength of each sensor (7), obtains the pressure and temperature values, and calculates the settlement value of the crude oil storage tank (101).

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