Atmospheric liquid storage tank pigging device

Abstract

This utility model discloses a sampling device for a normal pressure liquid storage tank, comprising: a liquid storage tank body, a sampling system, a gas adsorption treatment system, a sedimentation separation system, and a purging system. The liquid inlet of the liquid storage tank body is connected to a medium pipeline, which is equipped with a shut-off valve, a gate valve, and a first spring ball valve. The sedimentation separation system includes a quality inspection tank, a third spring ball valve, a fourth spring ball valve, a third self-returning spring ball valve, and a pump body. The quality inspection tank has a vertical conical structure. The gas adsorption treatment system includes an activated carbon adsorption tank, which is connected to the exhaust ports of a closed-loop sampler and the quality inspection tank. The purging system includes a purging pipeline and multiple nitrogen ports and independent control valves installed on the purging pipeline. This utility model is convenient to operate, safe, and environmentally friendly. It also achieves the separation of unqualified and qualified products, with the unqualified portion being discharged as wastewater and the qualified portion being returned to the liquid storage tank body, greatly improving sampling efficiency and saving sampling time and materials.

Description

Technical Field

[0001] This utility model relates to the field of tank sampling technology, and in particular to a sampling device for atmospheric pressure liquid storage tanks. Background Technology

[0002] Modern petrochemical industries primarily use steel vertical storage tanks for the production and storage of liquid products. When analytical sampling is required, it must be conducted according to GB / T4756-2015 "Manual Sampling Method for Petroleum Liquids," or sampling equipment conforming to SH / T3414-2017 "Selection, Inspection and Acceptance Standards for Samplers for Petrochemical Steel Vertical Storage Tanks." The sampling equipment must also meet the requirements of GB13348-2009 "Electrostatic Safety Regulations for Liquid Petroleum Products." To ensure that the collected samples accurately represent the original samples, correct sampling procedures and appropriate sampling tools are necessary.

[0003] Existing conventional sampling devices are limited in function, inconvenient to operate, unsafe, and environmentally unfriendly. They cannot separate unqualified products from qualified products, cannot pump the qualified portion of the sample back into the storage tank, fail to meet safety requirements, and pose a risk of dynamic seal leakage. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a sampling device for atmospheric pressure liquid storage tanks that is simple in structure, easy to use, safe, environmentally friendly, and has high sampling efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A sampling device for a normal pressure liquid storage tank includes: a liquid storage tank body, a sampling system, a gas adsorption treatment system, a sedimentation separation system, and a purging system. The inlet of the liquid storage tank body is connected to a medium pipeline. The medium pipeline is equipped with a shut-off valve, a gate valve, and a first spring ball valve. The sampling system includes a closed-circuit sampler, a first self-returning spring ball valve, a second self-returning spring ball valve, and a third spring ball valve. The first and second self-returning spring ball valves are connected in parallel through pipelines and then pass through the medium pipeline. The first self-returning spring ball valve is located at the inlet of the closed-circuit sampler. At the inlet end, the sedimentation separation system includes a quality inspection tank, a third spring ball valve, a fourth spring ball valve, a third self-returning spring ball valve, and a pump body. The quality inspection tank has a vertical conical structure. The third spring ball valve and the fourth spring ball valve are connected in series and are respectively connected to the pipelines of the quality inspection tank and the pump body. The gas adsorption treatment system includes an activated carbon adsorption tank. The activated carbon adsorption tank is respectively connected to the exhaust port pipelines of the closed-circuit sampler and the quality inspection tank. The purging system includes a purging pipeline and multiple nitrogen ports installed on the purging pipeline. The purging pipeline is equipped with an independent control valve.

[0007] In the above structure, there are two gate valves and two stop valves. The two gate valves are respectively located near the medium outlet and medium inlet of the medium pipeline. The medium pipeline is provided with at least one flange reserved port.

[0008] In the above structure, the fourth spring ball valve is connected to the pump body, and the return port of the pump body and the main body of the liquid storage tank is connected to the medium pipeline through a branch pipe. A one-way valve and a fifth spring ball valve are respectively provided on the branch pipe at intervals.

[0009] In the above structure, the quality inspection tank is equipped with a flap level gauge, the bottom of the quality inspection tank is equipped with an anti-vortex device, the top of the quality inspection tank is connected to the outlet end pipeline of the closed-circuit sampler, and the quality inspection tank is connected to the inlet of the pump body through the one-way valve.

[0010] In the above structure, the ratio of the maximum diameter of the anti-vortex device to the inner diameter of the quality inspection tank is 1:1.5-1:2.

[0011] The above structure also includes a sewage discharge pipeline, one end of which is connected through the pipeline between the third spring ball valve and the fourth spring ball valve. The third self-returning spring ball valve is installed on the sewage discharge pipeline, and the sewage discharge pipeline extends to the installed oil storage device.

[0012] In the above structure, the purging pipeline is sealed to the external purging equipment, the purging pipeline is connected to the top of each container through the corresponding nitrogen interface, the gas flow rate of the purging pipeline is controlled at 0.5-1.2m / s, and the purging pressure is 0.2-0.5MPa.

[0013] In the above structure, the main body of the liquid storage tank is made of stainless steel, and all connections of the main body of the liquid storage tank adopt a flange-type quick-release structure.

[0014] In the above structure, the closed-circuit sampler is a transparent glass container.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention enables the sealed collection of liquid samples, simultaneously separating unqualified from qualified samples, and pumping the qualified portion of the sample back into the storage tank. It also allows for the sealed collection of both gaseous and liquid samples, with unqualified portions being discharged as wastewater. This significantly improves sampling efficiency, saves sampling time and materials, and solves the problem of limited functionality in ordinary sampling devices. This invention features a simple structure, ease of use, safety, environmental friendliness, and high sampling efficiency. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the main body of the liquid storage tank in an embodiment of the atmospheric pressure liquid storage tank sampling device of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of an embodiment of the sampling device for atmospheric pressure liquid storage tanks according to this utility model.

[0019] In the diagram, 1-Liquid storage tank body, 2-Stop valve, 3-Gate valve, 4-First spring ball valve, 5-Closed-circuit sampler, 6-First self-returning spring ball valve, 7-Second self-returning spring ball valve, 8-Second spring ball valve, 9-Quality inspection tank, 10-Third spring ball valve, 11-Fourth spring ball valve, 12-Third self-returning spring ball valve, 13-Pump body, 14-Flange reserved port, 15-Check valve, 16-Fifth spring ball valve, 17-Anti-vortex device, N1-Media inlet, N2-Media outlet, N3-Drain outlet. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figure 1-2 As shown, a sampling device for a normal pressure liquid storage tank includes: a liquid storage tank body 1, a sampling system, a gas adsorption treatment system, a sedimentation separation system, and a purging system. The inlet of the liquid storage tank body 1 is connected to a medium pipeline. The medium pipeline is equipped with a shut-off valve 1, a gate valve 2, and a first spring ball valve 4. The sampling system includes a closed-loop sampler 5, a first self-returning spring ball valve 6, a second self-returning spring ball valve 7, and a second spring ball valve 8. The first self-returning spring ball valve 6 and the second self-returning spring ball valve 7 are connected in parallel through pipelines and then pass through the medium pipeline. The first self-returning spring ball valve 6 is located at the closed-loop sampler 5. At the inlet, the sedimentation separation system includes a quality inspection tank 9, a third spring ball valve 10, a fourth spring ball valve 11, a third self-returning spring ball valve 12, and a pump body 13. The quality inspection tank 9 has a vertical cone structure. The third spring ball valve 10 and the fourth spring ball valve 11 are connected in series to the pipelines of the quality inspection tank 9 and the pump body 13, respectively. The gas adsorption treatment system includes an activated carbon adsorption tank, which is connected to the exhaust port pipelines of the closed-loop sampler 5 and the quality inspection tank 9, respectively. The purging system includes a purging pipeline and multiple nitrogen ports installed on the purging pipeline. An independent control valve is provided on the purging pipeline.

[0022] Specifically, in this embodiment, the present invention can simultaneously collect liquid samples in a sealed manner and pump the qualified portion of the sample back to the main body of the liquid storage tank 1, solving the problem of the single function of ordinary sampling devices. The present invention is convenient to operate, safe and environmentally friendly, and at the same time realizes the separation of unqualified and qualified products. The unqualified part is discharged as wastewater and the qualified part is returned to the main body of the liquid storage tank 1, which greatly improves the sampling efficiency and saves sampling time and materials.

[0023] Specifically, in this embodiment, the purging system keeps the sampling device clean and avoids secondary contamination during the sampling process; the sampling system uses a closed-circuit sampler with an activated carbon adsorption tank, so there are no VOCs emissions during the sampling process; the gas adsorption treatment system uses activated carbon to adsorb VOCs generated during the sampling process, avoiding health risks to sampling personnel; the sedimentation separation system can recover and settle the collected samples, making them separate into layers; contaminated liquid samples need to be discharged from the bottom of the separation system; the remaining qualified samples after discharge can be pumped back to a dedicated storage tank for reuse.

[0024] In a preferred embodiment of this utility model, there are two gate valves 2 and two gate valves 3. The two gate valves 3 are respectively located near the medium outlet N2 and the medium inlet N1 of the medium pipeline. At least one flange reserved port 14 is provided on the medium pipeline.

[0025] In a preferred embodiment of this utility model, the fourth spring ball valve 11 is connected to the pump body 13, and the pump body 13 is connected to the return port of the liquid storage tank body 1 through a branch pipe and a medium pipeline. A one-way valve 15 and a fifth spring ball valve 16 are respectively provided on the branch pipe at intervals.

[0026] In a preferred embodiment of this utility model, the quality inspection tank 9 is equipped with a flap level gauge, the bottom of the quality inspection tank 9 is equipped with an anti-vortex device, the top of the quality inspection tank 9 is connected to the outlet end pipeline of the closed-circuit sampler 5, and the quality inspection tank 9 is connected to the inlet of the pump body 13 through a one-way valve 15.

[0027] Specifically, in this embodiment, the quality inspection tank 9 is used to measure the volume of fuel discharged when performing a visual inspection on the bottom sample of the vertical cone-bottom oil tank.

[0028] In a preferred embodiment of this invention, the ratio of the maximum diameter of the anti-vortex device to the inner diameter of the quality inspection tank 9 is 1:1.5-1:2.

[0029] Specifically, in this embodiment, an anti-vortex device is installed at the bottom of the quality inspection tank, which is connected to the pump inlet. This allows unqualified oil to be decontaminated in the oil tank, while qualified oil is returned to the storage tank, reducing waste.

[0030] In a preferred embodiment of the present invention, a sewage discharge pipeline is further included. One end of the sewage discharge pipeline is connected through a pipeline between the third spring ball valve 10 and the fourth spring ball valve 11. The third self-returning spring ball valve 12 is disposed on the sewage discharge pipeline, and the sewage discharge pipeline extends to the disposed oil storage device.

[0031] Specifically, in this embodiment, the oil sludge enters the oil sludge storage device through the drain outlet N3 of the drain pipe.

[0032] In a preferred embodiment of this invention, the purging pipeline is sealed to the external purging equipment, and the purging pipeline is connected to the top of each container through a corresponding nitrogen port. The gas flow rate of the purging pipeline is controlled at 0.5-1.2 m / s, and the purging pressure is 0.2-0.5 MPa.

[0033] Specifically, in this embodiment, the purging system is connected to the top of each container through a nitrogen interface, and the purging pipeline is equipped with a combination of multiple valves for controlling the flow of the medium in the medium pipeline of the purging system.

[0034] In a preferred embodiment of this utility model, the liquid storage tank body 1 is made of stainless steel, and all connections of the liquid storage tank body 1 adopt a flange-type quick-release structure.

[0035] In a preferred embodiment of this invention, the closed-circuit sampler 5 is a transparent glass container.

[0036] The working principle of this utility model is as follows: Gate valve 3 and stop valve 2 are normally open valves. During operation, the second self-returning spring ball valve 7 is opened, allowing the liquid at the bottom of the storage tank to enter the quality inspection tank 9. After the liquid in the original pipeline is completely replaced, the second self-returning spring ball valve 7 is closed, and the first self-returning spring ball valve 6 is opened, allowing fresh liquid in the main body 1 of the liquid storage tank to flow into the closed-circuit sampler 5. The closed-circuit sampler 5 is made of transparent glass, allowing observation of the state of the fresh liquid flowing into the closed-circuit sampler 5, thereby determining whether the appearance of the medium meets the requirements. After the determination is completed, the liquid in the closed-circuit sampler is discharged into the quality inspection tank 9. When the liquid in the quality inspection tank 9 reaches the upper limit of its volume, the pump body 13 can be started to discharge the unclean liquid at the bottom through the medium outlet N2, and the qualified liquid medium at the top is discharged through the medium inlet N1.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical 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 utility model based on the specific circumstances.

[0039] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A sampling device for a normal pressure liquid storage tank, comprising: The liquid storage tank body, sampling system, gas adsorption treatment system, sedimentation separation system, and purging system are characterized in that the liquid inlet of the liquid storage tank body is connected to a medium pipeline, the medium pipeline is equipped with a shut-off valve, a gate valve, and a first spring ball valve; the sampling system includes a closed-circuit sampler, a first self-returning spring ball valve, a second self-returning spring ball valve, and a third spring ball valve; the first and second self-returning spring ball valves are connected in parallel through pipelines and then penetrate the medium pipeline; the first self-returning spring ball valve is located at the inlet end of the closed-circuit sampler. The sedimentation separation system includes a quality inspection tank, a third spring ball valve, a fourth spring ball valve, a third self-returning spring ball valve, and a pump body. The quality inspection tank has a vertical conical structure. The third and fourth spring ball valves are connected in series and are respectively connected to the pipelines of the quality inspection tank and the pump body. The gas adsorption treatment system includes an activated carbon adsorption tank, which is respectively connected to the exhaust port pipelines of the closed-circuit sampler and the quality inspection tank. The purging system includes a purging pipeline and multiple nitrogen ports installed on the purging pipeline. The purging pipeline is equipped with an independent control valve.

2. The sampling device for atmospheric pressure liquid storage tanks according to claim 1, characterized in that, There are two gate valves and two stop valves. The two gate valves are respectively located near the medium outlet and medium inlet of the medium pipeline. The medium pipeline is provided with at least one flange reserved port.

3. The sampling device for atmospheric pressure liquid storage tanks according to claim 1, characterized in that, The fourth spring ball valve is connected to the pump body. The return port of the pump body and the main body of the liquid storage tank is connected to the medium pipeline through a branch pipe. A one-way valve and a fifth spring ball valve are respectively provided on the branch pipe at intervals.

4. The sampling device for atmospheric pressure liquid storage tanks according to claim 3, characterized in that, The quality inspection tank is equipped with a flap level gauge, and an anti-vortex device is installed at the bottom of the quality inspection tank. The top of the quality inspection tank is connected to the outlet end of the closed-circuit sampler, and the quality inspection tank is connected to the inlet of the pump body through the one-way valve.

5. The sampling device for atmospheric pressure liquid storage tanks according to claim 4, characterized in that, The ratio of the maximum diameter of the anti-vortex device to the inner diameter of the quality inspection tank is 1:1.5-1:

2.

6. The sampling device for atmospheric pressure liquid storage tanks according to claim 2, characterized in that, It also includes a sewage discharge pipeline, one end of which is connected through the pipeline between the third spring ball valve and the fourth spring ball valve. The third self-returning spring ball valve is installed on the sewage discharge pipeline, and the sewage discharge pipeline extends to the installed oil storage device.

7. The sampling device for atmospheric pressure liquid storage tanks according to claim 2, characterized in that, The purging pipeline is sealed to the external purging equipment. The purging pipeline is connected to the top of each container through the corresponding nitrogen interface. The gas flow rate of the purging pipeline is controlled at 0.5-1.2 m / s, and the purging pressure is 0.2-0.5 MPa.

8. The sampling device for atmospheric pressure liquid storage tanks according to claim 1, characterized in that, The main body of the liquid storage tank is made of stainless steel, and all connections of the main body of the liquid storage tank adopt a flange-type quick-release structure.

9. The sampling device for atmospheric pressure liquid storage tanks according to claim 1, characterized in that, The closed-circuit sampler is a transparent glass container.

Images