Storage tank bottom plate external corrosion prevention and leakage monitoring system and method

Abstract

The invention belongs to the field of storage tank bottom plate corrosion prevention, and discloses a storage tank bottom plate external corrosion prevention and leakage monitoring system and method. The system comprises a storage tank, a bottom plate, a base, a sealing system, a gas transmission system and a detection system, wherein the sealing system wraps the outer edge of the bottom plate; the detection system comprises a plurality of monitoring holes, the monitoring holes horizontally penetrate through the base, and gas component monitors are arranged at outlets in the two ends of each monitoring hole; the gas transmission system comprises a plurality of gas transmission holes, and outlets of the gas transmission holes are communicated with the clearance space between the bottom plate and the base. According to the scheme provided by the invention, various inert gases can be conveniently provided for the base area, the operation of the storage tank is not interrupted, the operation can be carried out at any time as required, meanwhile, the leakage of the storage tank can be monitored according to the gas component monitor, and the structural integrity of the bottom plate of the storage tank is ensured.

Description

Technical Field

[0001] The invention belongs to the field of tank bottom plate anti-corrosion, and in particular relates to a tank bottom plate external anti-corrosion and leakage monitoring system and method. Background Art

[0002] The edge plate of a crude oil storage tank mainly refers to a circle of tank wall that contacts the cement base on the periphery of the base. It is the connection and pressure-bearing part between the entire tank body and the cement base. It is very easy to store water and corrode. 80% of tank corrosion occurs on the bottom plate of the tank, and the corrosion of the edge plate accounts for 60% of the bottom plate corrosion. The bases in coastal areas are mostly located in soft soil layers. The tank bottom foundation is prone to settlement and deformation due to the influence of load and ambient temperature. At the same time, the impact of falling ice on the top of the tank in winter in the northern region, as well as high ultraviolet light, high salt fog and other conditions, cause the anti-corrosion material of the tank bottom edge plate to crack and break seriously, and lose the protection of the tank bottom.

[0003] In order to solve the problem of external corrosion of the tank bottom plate, the CN201420500031 patent proposes a tank edge plate anti-corrosion sealing system, which uses non-curing anti-corrosion paste to fill the gap between the edge plate and the cement ring beam, and the coating is shaped into a gentle slope to form a complete anti-corrosion sealing system. The system has good elasticity, weather resistance and corrosion resistance. The main problem with this system is that as the service time increases, the sealing system may age and crack. In addition, when the coating is cracked, it is difficult to detect in time, causing corrosion.

[0004] The existing anti-corrosion methods for the bottom plate of the storage tank are mainly to achieve external anti-corrosion of the bottom plate of the soil side tank through the following methods or a combination of the following methods. The first method is to cover the edge plate with a waterproof skirt. The waterproof skirt is mainly achieved by sealant, but the waterproof sealing rubber ring is prone to cracking. Cracks or water vapor can easily enter the interlayer between the bottom plate and the base, which aggravates the corrosion. The second method is to apply anti-corrosion paint. The anti-corrosion paint can effectively isolate the bottom plate from the corrosive medium, but the anti-corrosion paint will inevitably have leaks, and as the service time increases, it is prone to aging and failure, causing corrosion of the bottom plate. The third method is to bury sacrificial anodes. However, sacrificial anodes generally have the problem of short lifespan and cannot be as long as the lifespan of the storage tank. It is impossible to provide external anti-corrosion protection for the bottom plate in the later stage of operation.

[0005] Therefore, it is necessary to provide a tank bottom external corrosion protection and leakage monitoring system and method, which can protect the soil side bottom of existing or new tanks in a fast, low-cost and convenient way, maintain the operation of existing tanks without interrupting the operation of the tanks, and is suitable for above-ground tanks of different designs and sizes as well as different environments and application conditions. Summary of the invention

[0006] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a tank bottom external corrosion protection and leakage monitoring system and method, which can protect the soil side bottom of existing or new tanks in a fast, low-cost and convenient manner, and can maintain the operation of existing tanks without interrupting the operation of the tanks. It is suitable for ground tanks of different designs and sizes and different environments and application conditions.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A tank bottom plate external anti-corrosion and leakage monitoring system, including a tank, a bottom plate and a base, a sealing system, a gas transmission system and a detection system.

[0009] The sealing system wraps around the outer edge of the bottom plate, the inner side of the sealing system is connected to the tank wall of the storage tank, the outer side of the sealing system is connected to the base, and the lower surface of the sealing system is in contact with the upper surface of the bottom plate and the base;

[0010] The detection system includes a plurality of monitoring holes, which horizontally penetrate the base, and the outlets at both ends of the monitoring holes are evenly arranged on the circumferential surface of the base, and the outlets at both ends of the monitoring holes are provided with gas component monitors;

[0011] The gas transmission system includes a plurality of gas transmission holes, which correspond to the monitoring holes. The inlets of the gas transmission holes are located between the monitoring holes and the sealing system, and the outlets of the gas transmission holes are connected to the gap space between the bottom plate and the base.

[0012] In some embodiments of the present invention, the sealing system includes a sealing layer, a waterproof and flame-retardant elastic layer, and a filling layer arranged in sequence from top to bottom;

[0013] The waterproof and flame-retardant elastic layer is made of silicone rubber or hydrogenated nitrile rubber;

[0014] The sealing layer adopts butyl flame retardant waterproof sealing tape, and the gas permeability is less than 0.01m3 / m2*24h*0.1MPa;

[0015] The filling layer is made of elastic rubber blocks.

[0016] In some embodiments of the present invention, the sealing layer forms an angle of 15 to 30 degrees with the horizontal plane.

[0017] In some embodiments of the present invention, the inlet of the gas delivery hole is connected to a gas delivery pipeline or a pressure gas cylinder.

[0018] In some embodiments of the present invention, the gas pipeline or the pressure gas cylinder is used to transport the inert gas, and the inert gas includes nitrogen and / or argon.

[0019] In some embodiments of the present invention, the gas composition monitor is used to monitor the content of inert gases, oxygen, moisture, carbon dioxide and hydrocarbon combustibles.

[0020] In some embodiments of the present invention, corrosion coupons are provided at both end outlets of the monitoring hole to characterize the corrosion rate.

[0021] On the other hand, the present invention discloses a method for anti-corrosion and leakage monitoring of a bottom plate of a storage tank, comprising:

[0022] The sealing system is wrapped around the outer edge of the bottom plate, the inner ring of the sealing system is connected to the tank wall of the storage tank, the outer ring of the sealing system is connected to the base, and the lower surface of the sealing system is in contact with the upper surface of the bottom plate and the base;

[0023] A monitoring hole is obtained by horizontally punching a hole on the side of the base, and gas component monitors are arranged at the outlets at both ends of the monitoring hole;

[0024] A gas transmission hole is obtained by punching a hole on the side of the base, the gas transmission hole corresponds to the monitoring hole, the inlet of the gas transmission hole is located between the monitoring hole and the sealing system, and the outlet of the gas transmission hole is connected to the gap space between the bottom plate and the base;

[0025] Inert gas is injected into the gas delivery holes so that the inert gas penetrates into the gap space between the bottom plate and the base.

[0026] In some embodiments of the present invention, injecting an inert gas into the gas delivery hole comprises:

[0027] Inert gas is injected into the gas transmission hole, and the concentration of the inert gas is monitored by a gas monitor at the outlet of the monitoring hole on the opposite side of the gas transmission hole. When the concentration of the inert gas reaches 95%, the injection is stopped and the gas transmission hole is closed.

[0028] In some embodiments of the present invention, after injecting the inert gas into the gas delivery hole, the method further comprises:

[0029] A gas monitor is used to monitor the content of oxygen, moisture, carbon dioxide, and hydrocarbon combustibles in each monitoring hole. When the content of oxygen and / or moisture and / or carbon dioxide is greater than the preset value, inert gas is injected into the gas supply hole corresponding to the monitoring hole. When the content of hydrocarbon combustibles is greater than the preset value, the bottom plate is leaked or the tank is opened for maintenance.

[0030] In some embodiments of the present invention, after injecting the inert gas into the gas delivery hole, the method further comprises:

[0031] A corrosion hanging plate is set at the outlet of the monitoring hole and the corrosion hanging plate is inspected regularly. When corrosion products appear, inert gas is injected into the gas transmission hole corresponding to the monitoring hole.

[0032] Technical effects and advantages of the present invention:

[0033] 1. The present invention can easily provide various inert gases to the base area by adding a sealing system, a gas transmission system and a detection system to the existing storage tank, the bottom plate and the base, without interrupting the operation of the storage tank, and can be carried out at any time as needed. At the same time, the leakage of the storage tank can be monitored according to the gas component monitor to ensure the structural integrity of the bottom plate of the storage tank.

[0034] 2. The present invention adopts silicone rubber or hydrogenated nitrile rubber as the waterproof and flame-retardant elastic layer to achieve better viscoelasticity, adhesion, chemical resistance, and UV aging resistance.

[0035] 3. The present invention controls the sealing layer to present an angle of 15 to 30 degrees with the horizontal plane to prevent rainwater from gathering and corroding the bottom plate.

[0036] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a tank bottom plate external anti-corrosion and leakage monitoring system of the present invention;

[0038] Figure 2 The present invention is a flow chart of a method for monitoring the external corrosion and leakage of a storage tank bottom plate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] like Figure 1 As shown, the present invention provides a tank bottom plate external anti-corrosion and leakage monitoring system, including a tank 1, a bottom plate 3, a base 2, a sealing system, a gas transmission system and a detection system.

[0041] The sealing system wraps around the outer edge of the bottom plate 3, the inner side of the sealing system is connected to the tank wall of the storage tank 1, the outer side of the sealing system is connected to the base 2, and the lower surface of the sealing system is in contact with the upper surface of the bottom plate 3 and the base 2;

[0042] The detection system includes a plurality of monitoring holes 4, the monitoring holes 4 horizontally penetrate the base 2, and the outlets at both ends of the monitoring holes 4 are evenly arranged on the circumferential surface of the base 2, and the outlets at both ends of the monitoring holes 4 are provided with gas component monitors 5;

[0043] The gas delivery system includes a plurality of gas delivery holes 6 , which correspond to the monitoring holes 4 . The inlet of the gas delivery hole 6 is located between the monitoring hole 4 and the sealing system, and the outlet of the gas delivery hole 6 is connected to the gap space between the bottom plate 3 and the base 2 .

[0044] In some embodiments of the present invention, the sealing system comprises a sealing layer 7, a waterproof and flame-retardant elastic layer 8, and a filling layer 9 which are arranged in sequence from top to bottom;

[0045] The waterproof and flame-retardant elastic layer 8 is made of silicone rubber or hydrogenated nitrile rubber to achieve good viscoelasticity, adhesion, chemical resistance, and UV aging resistance;

[0046] The sealing layer 7 adopts butyl flame retardant waterproof sealing tape, and the gas permeability is less than 0.01m 3 / m 2 *24h*0.1MPa, which can isolate the bottom plate of the tank from the outside air;

[0047] The filling layer 9 is made of elastic rubber blocks.

[0048] In some embodiments of the present invention, the sealing layer 7 is at an angle of 15 to 30° with the horizontal plane to prevent rainwater from gathering.

[0049] In some embodiments of the present invention, the inlet of the gas delivery hole 6 is connected to a gas delivery pipeline or a pressure gas cylinder.

[0050] In some embodiments of the present invention, the gas pipeline or the pressure gas cylinder is used to transport the inert gas, and the inert gas includes nitrogen and / or argon.

[0051] In some embodiments of the present invention, the gas composition monitor 5 is used to monitor the content of inert gas, oxygen, moisture, carbon dioxide and hydrocarbon combustibles.

[0052] In some embodiments of the present invention, corrosion coupons are provided at outlets at both ends of the monitoring hole 4 to characterize the corrosion rate.

[0053] On the other hand, Figure 2 As shown, the present invention discloses a method for anti-corrosion and leakage monitoring of the bottom plate of a storage tank, comprising:

[0054] The sealing system is wrapped around the outer edge of the bottom plate 3, the inner ring of the sealing system is connected to the tank wall of the storage tank 1, the outer ring of the sealing system is connected to the base 2, and the lower surface of the sealing system is in contact with the upper surface of the bottom plate 3 and the base 2;

[0055] A monitoring hole 4 is obtained by horizontally punching a hole on the side of the base 2, and gas component monitors 5 are arranged at outlets at both ends of the monitoring hole 4;

[0056] A gas delivery hole 6 is obtained by punching a hole on the side of the base 2. The gas delivery hole 6 corresponds to the monitoring hole 4. The inlet of the gas delivery hole 6 is located between the monitoring hole 4 and the sealing system. The outlet of the gas delivery hole 6 communicates with the gap space between the bottom plate 3 and the base 2.

[0057] Inert gas is injected into the gas delivery hole 6 so that the inert gas penetrates into the gap space between the bottom plate 3 and the base 2 .

[0058] In some embodiments of the present invention, injecting an inert gas into the gas delivery hole 6 comprises:

[0059] Inject inert gas, such as nitrogen and / or argon, into the gas delivery hole 6, and monitor the concentration of the inert gas using a gas monitor 5 at the outlet of the monitoring hole 4 on the opposite side of the gas delivery hole 6. When the concentration of the inert gas reaches 95%, stop injecting and close the gas delivery hole 6 to ensure that the inert gas is evenly injected into the gap between the bottom plate and the base of the storage tank;

[0060] In some embodiments of the present invention, after the inert gas is injected into the gas delivery hole 6, the following steps are further included:

[0061] The gas monitor 5 is used to monitor the oxygen, moisture, carbon dioxide, and hydrocarbon combustible content in each monitoring hole 4. When the oxygen and / or moisture and / or carbon dioxide content is greater than the preset value, inert gas is injected into the gas supply hole 6 corresponding to the monitoring hole 4. When the hydrocarbon combustible content is greater than the preset value, the bottom plate 3 is leak-detected or the tank is opened for maintenance.

[0062] In some embodiments of the present invention, after injecting inert gas into the gas supply hole 6, it also includes: setting a corrosion hanging plate at the outlet of the monitoring hole 4, regularly inspecting the corrosion hanging plate, and when corrosion products appear, injecting inert gas into the gas supply hole 6 corresponding to the monitoring hole 4.

[0063] In order to better illustrate this solution, the following embodiments are also provided:

[0064] Example

[0065] An external anti-corrosion and leakage monitoring system for the bottom plate of the tank is added to the existing tank 1, bottom plate 3 and base 2, and the edge protection of the bottom plate 3 is removed to expose the side wall of the tank 1 and the edge of the bottom plate 3; a filling layer 9 (using elastic rubber blocks), a covering waterproof and flame-retardant elastic layer 8 (using silicone rubber or hydrogenated nitrile rubber) and a sealing layer 7 (using butyl flame-retardant waterproof sealing tape with a gas permeability of less than 0.01m 3 / m 2*24h*0.1MPa), and the final sealing layer 7 presents an angle of 15 to 30° with the horizontal plane to prevent rainwater from gathering; a plurality of horizontal monitoring holes 4 are evenly opened along the circumferential surface of the base 2, and gas monitors 5 are arranged at the outlets of both ends of the monitoring holes 4; a plurality of gas delivery holes 6 are opened on the circumferential surface of the base 2, and the inlet of the gas delivery hole 6 is located between the outlet of the monitoring hole 4 and the filling layer 9, the outlet of the gas delivery hole 6 is connected to the gap space between the bottom plate 3 and the base 2, and the inlet of the gas delivery hole 6 is connected to a gas delivery pipeline or a pressure gas cylinder for conveying inert gas, and the inert gas includes nitrogen and / or argon.

[0066] Nitrogen and / or argon are injected from the inlet of the gas delivery hole 6, so that the nitrogen and / or argon penetrate into the gap between the bottom plate 3 and the base 2. When the nitrogen and / or argon are injected, the concentration of nitrogen and / or argon is monitored at the outlet of the monitoring hole 4 on the opposite side of the gas delivery hole 6. When the concentration of nitrogen and / or argon reaches 95%, the injection is stopped to ensure that the nitrogen and / or argon are evenly injected into the gap between the bottom plate 3 and the base 2. After the injection is completed, the gas delivery hole 6 is closed; the oxygen, moisture, carbon dioxide, and hydrocarbon combustible contents in the monitoring hole 4 are monitored by the gas monitor 5, and at the same time, the gas monitoring hole 4 is used to monitor the concentration of nitrogen and / or argon. Corrosion hangers are set at the outlets of both ends of the hole 4 to characterize the corrosion rate; the corrosion hangers are inspected regularly, and when corrosion products appear, nitrogen and / or argon are injected from the gas supply hole 6 corresponding to the outlet of the monitoring hole 4 where the corrosion hanger is located; when the oxygen, moisture and carbon dioxide content monitored by the gas monitor 5 are greater than the preset values, nitrogen and / or argon are injected from the gas supply hole 6 corresponding to the outlet of the monitoring hole 4 where the gas monitor 4 is located; when the hydrocarbon combustible concentration monitored by the gas monitor 5 is greater than the preset value, the bottom plate 3 is leaked or the tank is opened for inspection to check the integrity of the storage tank 1.

[0067] In summary, the solution provided by the present invention can very conveniently provide various inert gases to the base area, one or more different inert gases can be used, the inert gas can be applied at any desired time, and the inert gas can be added to the gas delivery system without interrupting the operation of the storage tank. The inert gas addition operation can be performed as needed, and can be manually or automatically controlled according to a specific number of times or time intervals. An automatic control system can also be added to add inert gas or remind leak detection based on feedback received by the gas monitor.

[0068] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tank bottom plate external anti-corrosion and leakage monitoring system, comprising a tank (1), a bottom plate (3) and a base (2), characterized in that: Including sealing system, gas transmission system and detection system, The sealing system wraps around the outer edge of the bottom plate (3), the inner side of the sealing system is connected to the tank wall of the storage tank (1), the outer side of the sealing system is connected to the base (2), and the lower surface of the sealing system is in contact with the upper surfaces of the bottom plate (3) and the base (2); The detection system comprises a plurality of monitoring holes (4), wherein the monitoring holes (4) horizontally penetrate the base (2), and outlets at both ends of the monitoring holes (4) are evenly arranged on the circumferential surface of the base (2), and gas component monitors (5) are arranged at both end outlets of the monitoring holes (4); The gas delivery system comprises a plurality of gas delivery holes (6), the gas delivery holes (6) corresponding to the monitoring holes (4), the inlets of the gas delivery holes (6) being located between the monitoring holes (4) and the sealing system, and the outlets of the gas delivery holes (6) being connected to the gap space between the bottom plate (3) and the base (2).

2. A tank bottom plate external anti-corrosion and leakage monitoring system according to claim 1, characterized in that: The sealing system comprises a sealing layer (7), a waterproof and flame-retardant elastic layer (8), and a filling layer (9) which are arranged in sequence from top to bottom; The waterproof and flame-retardant elastic layer (8) is made of silicone rubber or hydrogenated nitrile rubber; The sealing layer (7) is made of butyl flame retardant waterproof sealing tape, and the gas permeability is less than 0.01m 3 / m 2 *24h*0.1MPa; The filling layer (9) is made of elastic rubber blocks.

3. A tank bottom plate external anti-corrosion and leakage monitoring system according to claim 2, characterized in that: The sealing layer (7) forms an angle of 15 to 30° with the horizontal plane.

4. A tank bottom plate external anti-corrosion and leakage monitoring system according to claim 1, characterized in that: The inlet of the gas delivery hole (6) is connected to a gas delivery pipeline or a pressure gas cylinder.

5. A tank bottom plate external anti-corrosion and leakage monitoring system according to claim 3, characterized in that: The gas pipeline or pressure gas cylinder is used to transport inert gas, and the inert gas includes nitrogen and / or argon.

6. A tank bottom plate external anti-corrosion and leakage monitoring system according to claim 1, characterized in that: The gas component monitor (5) is used to monitor the content of inert gas, oxygen, moisture, carbon dioxide and hydrocarbon combustibles.

7. A tank bottom plate external anti-corrosion and leakage monitoring system according to claim 1, characterized in that: Corrosion hanging plates are arranged at the outlets at both ends of the monitoring hole (4) for characterizing the corrosion rate.

8. A method for monitoring the external corrosion and leakage of a tank bottom plate, characterized in that: include: A sealing system is wrapped around the outer edge of the bottom plate (3), the inner ring of the sealing system is connected to the tank wall of the storage tank (1), the outer ring of the sealing system is connected to the base (2), and the lower surface of the sealing system is in contact with the upper surfaces of the bottom plate (3) and the base (2); A monitoring hole (4) is horizontally perforated on the side of the base (2), and gas component monitors (5) are arranged at outlets at both ends of the monitoring hole (4); A gas delivery hole (6) is obtained by punching a hole on the side of the base (2), the gas delivery hole (6) corresponds to the monitoring hole (4), the inlet of the gas delivery hole (6) is located between the monitoring hole (4) and the sealing system, and the outlet of the gas delivery hole (6) is connected to the gap space between the bottom plate (3) and the base (2); Inert gas is injected into the gas delivery hole (6) so that the inert gas penetrates into the gap space between the bottom plate (3) and the base (2).

9. A tank bottom plate leakage monitoring method according to claim 8, characterized in that: The step of injecting the inert gas into the gas delivery hole (6) comprises: Inert gas is injected into the gas delivery hole (6), and the concentration of the inert gas is monitored by a gas monitor (5) at the outlet of the monitoring hole (4) opposite to the gas delivery hole (6). When the concentration of the inert gas reaches 95%, the injection is stopped and the gas delivery hole (6) is closed.

10. A tank bottom plate leakage monitoring method according to claim 9, characterized in that: After the inert gas is injected into the gas delivery hole (6), the method further comprises: A gas monitor (5) is used to monitor the contents of oxygen, moisture, carbon dioxide and hydrocarbon combustibles in each monitoring hole (4); when the contents of oxygen and / or moisture and / or carbon dioxide are greater than a preset value, an inert gas is injected into the gas delivery hole (6) corresponding to the monitoring hole (4); when the content of hydrocarbon combustibles is greater than a preset value, a leak detection is performed on the bottom plate (3) or the tank is opened for inspection.

11. A method for monitoring tank bottom plate leakage according to any one of claims 8 to 10, characterized in that: After the inert gas is injected into the gas delivery hole (6), the method further comprises: A corrosion hanging plate is arranged at the outlet of the monitoring hole (4), and the corrosion hanging plate is regularly inspected. When corrosion products appear, an inert gas is injected into the gas delivery hole (6) corresponding to the monitoring hole (4).

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