Simulation test device for layered cheating of vertical storage tank

Abstract

The utility model discloses a vertical storage tank layered cheating simulation test device, which belongs to the technical field of oil tank cheating simulation and comprises a tank body, an oil dipstick, an auxiliary pipe, a water container, an oil container, a first electronic scale, a second electronic scale, a plurality of pipelines and a plurality of valves, the auxiliary pipe extends into the tank body and is close to the bottom of the tank body, and the oil dipstick extends into the bottom of the tank body. The oil container is placed on the first electronic scale, one end of the first pipeline extends into the oil container, the other end of the first pipeline is communicated with the second pipeline, the other end of the second pipeline extends into the tank body, the seventh valve, the oil pump and the eighth valve are arranged on the first pipeline, and the ninth valve is arranged on the second pipeline; the water container is placed on the second electronic scale, one end of the third pipeline extends into the water container, the other end of the third pipeline is communicated with the bottom end of the tank body, and the eleventh valve, the water pump and the twelfth valve are arranged on the third pipeline. The system effectively analyzes the cheating mechanism, reproduces the cheating process and calculates the cheating amount by setting up the layered cheating state of the vertical storage tank.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil tank cheating simulation, and particularly relates to a layered cheating simulation test device for vertical storage tanks. Background Art

[0002] Vertical storage tanks (such as vertical metal tanks and vertical cement tanks) are widely used for storing and metering liquid petrochemical products. In recent years, there have been incidents of cheating by taking advantage of the layered property of liquids stored in vertical storage tanks in the industry, also known as "water turning into oil" cheating. On the one hand, such cheating methods are concealed and cannot be detected by general detection means; on the other hand, even if cheating behavior is discovered, it is very difficult to accurately detect the layered position, so it is impossible to accurately judge the actual profit of cheating. Content of the Utility Model

[0003] In view of this, the utility model provides a layered cheating simulation test device for vertical storage tanks to solve the above problems.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A layered cheating simulation test device for vertical storage tanks, comprising: a tank body, an oil gauge, an auxiliary pipe, a water container, an oil container, a first electronic scale, a second electronic scale, a first pipeline, a second pipeline, a third pipeline, a seventh valve, an oil pump, an eighth valve, a ninth valve, an eleventh valve, a water pump and a twelfth valve. A metering hole is provided at the top end of the tank body. The auxiliary pipe passes through the metering hole and extends into the tank body and approaches the bottom of the tank body. The oil gauge extends to the bottom of the tank body or passes through the auxiliary pipe and extends to the bottom of the tank body. The oil container is placed on the first electronic scale. One end of the first pipeline extends into the oil container, and the other end is communicated with the second pipeline. The other end of the second pipeline extends into the tank body through the top end of the tank body. The seventh valve, the oil pump and the eighth valve are sequentially arranged on the first pipeline. The ninth valve is arranged on the second pipeline. The water container is placed on the second electronic scale. One end of the third pipeline extends into the water container, and the other end is communicated with the bottom end of the tank body. The eleventh valve, the water pump and the twelfth valve are sequentially arranged on the third pipeline.

[0006] Further, it further comprises a fourth pipeline and a tenth valve. One end of the fourth pipeline is communicated with the connection end of the first pipeline and the second pipeline through a tee. The other end of the fourth pipeline is communicated with the bottom end of the tank body. The tenth valve is arranged on the fourth pipeline.

[0007] Further, it further includes a fifth pipeline, a sixth pipeline, a seventh pipeline, an eighth pipeline, a first valve, a mixing pump, a second valve, an observation pipe, a third valve, a fourth valve, a fifth valve, an oil-water separator, a ninth pipeline, a tenth pipeline, a sixth valve, and a thirteenth valve. One end of the fifth pipeline is communicated with the bottom end of the tank body, and the other end is communicated with the sixth pipeline, the seventh pipeline, and the eighth pipeline through a four-way joint. The other end of the sixth pipeline is communicated with the oil container, the other end of the seventh pipeline is communicated with the oil-water separator, and the other end of the eighth pipeline is communicated with the water container. One ends of the ninth pipeline and the tenth pipeline are both communicated with the oil-water separator. The other end of the ninth pipeline is communicated with the oil container, and the other end of the tenth pipeline is communicated with the water container. The first valve, the mixing pump, the second valve, and the observation pipe are sequentially arranged on the fifth pipeline. The third valve is installed on the sixth pipeline, the fourth valve is installed on the seventh pipeline, the fifth valve is installed on the eighth pipeline, the sixth valve is installed on the ninth pipeline, and the thirteenth valve is installed on the tenth pipeline.

[0008] Further, a sampling pipe is arranged at the bottom end of the tank body, and a sampling valve is arranged on the sampling pipe.

[0009] Further, it further includes a first regulating valve, and the first regulating valve is installed on the fifth pipeline and is located between the second valve and the observation pipe.

[0010] Further, it further includes a second regulating valve, and the second regulating valve is installed on the first pipeline and is located after the eighth valve.

[0011] Further, it further includes a third regulating valve, and the third regulating valve is installed on the third pipeline and is located after the twelfth valve.

[0012] The beneficial effects of the present utility model are as follows:

[0013] The present utility model simulates and constructs the stratified cheating state of a vertical storage tank, gives the process of detecting cheating and testing the cheating amount, and conducts reliability verification. It can effectively analyze the cheating mechanism, reproduce the cheating process, and calculate the cheating amount. It is applicable to both laboratory simulation and on-site application. The structure of the present utility model is simple and is easy to be implemented and popularized in college teaching, institutional training, and technical arbitration and analysis work. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0015] Figure 1 is a structural view of a vertical storage tank layered cheating simulation test device;

[0016] Among them, in the figure:

[0017] 1 - tank body, 2 - dipstick, 3 - auxiliary pipe, 4 - water container, 5 - oil container, 6 - first electronic scale, 7 - second electronic scale, 8 - first pipeline, 9 - second pipeline, 10 - third pipeline, 11 - seventh valve, 12 - oil pump, 13 - eighth valve, 14 - ninth valve, 15 - eleventh valve, 16 - water pump, 17 - twelfth valve, 18 - fourth pipeline, 19 - tenth valve, 20 - fifth pipeline, 21 - sixth pipeline, 22 - seventh pipeline, 23 - eighth pipeline, 24 - first valve, 25 - mixing pump, 26 - second valve, 27 - observation pipe, 28 - third valve, 29 - fourth valve, 30 - fifth valve, 31 - oil - water separator, 32 - ninth pipeline, 33 - tenth pipeline, 34 - sixth valve, 35 - thirteenth valve, 36 - sampling pipe, 37 - sampling valve, 38 - first regulating valve, 39 - second regulating valve, 40 - third regulating valve. Detailed implementation manners

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0019] Refer to the attached Figure 1As shown in the figure, the utility model provides a vertical storage tank layered cheating simulation test device, including: a tank body 1, a dipstick 2, an auxiliary pipe 3, a water container 4, an oil container 5, a first electronic scale 6, a second electronic scale 7, a first pipeline 8, a second pipeline 9, a third pipeline 10, a seventh valve 11, an oil pump 12, an eighth valve 13, a ninth valve 14, an eleventh valve 15, a water pump 16 and a twelfth valve 17; the tank body 1 is a vertical cylinder, which can simulate a vertical storage tank, the top is designed as an arch, and a metering hole is arranged at the top of the arched tank body 1. The auxiliary pipe 3 is a PVC plastic pipe, which passes through the metering hole and extends into the tank body 1 and is close to the bottom of the tank body 1, and is used to introduce the water in the lower layer of the tank body 1 into the auxiliary pipe 3; the dipstick 2 extends into the bottom of the tank body 1 through the metering hole, and is used to measure the total height of the liquid level in the tank, or extends into the bottom of the tank body 1 through the auxiliary pipe 3, and is used to measure the water level height inside the auxiliary pipe 3; the oil container 5 is placed on the first electronic scale 6, and the oil container 5 is used to hold the test oil medium, and the first electronic scale 6 is used to weigh the weight of the medium in the oil container 5; one end of the first pipeline 8 extends into the oil container 5, and the other end is communicated with the second pipeline 9. The other end of the second pipeline 9 extends into the tank body 1 through the top of the tank body 1. The seventh valve 11, the oil pump 12 and the eighth valve 13 are arranged on the first pipeline 8 in sequence. The oil pump 12 is used to discharge the oil into the vertical storage tank, and the ninth valve 14 is arranged on the second pipeline 9; the water container 4 is placed on the second electronic scale 7, and the water container 4 is used to hold the test water medium, and the second electronic scale 7 is used to weigh the weight of the medium in the water container 4; one end of the third pipeline 10 extends into the water container 4, and the other end is communicated with the bottom end of the tank body 1. The eleventh valve 15, the water pump 16 and the twelfth valve 17 are arranged on the third pipeline 10 in sequence. The water pump 16 is used to discharge the water into the vertical storage tank. In actual use, two densitometers are also used in cooperation to measure the medium density in the water container 4 and the oil container 5 respectively.

[0020] A vertical storage tank layered cheating simulation test device further includes a fourth pipeline 18 and a tenth valve 19. One end of the fourth pipeline 18 is communicated with the connection end of the first pipeline 8 and the second pipeline 9 through a tee, and the other end of the fourth pipeline 18 is communicated with the bottom end of the tank body 1. The tenth valve 19 is arranged on the fourth pipeline 18.

[0021] A vertical storage tank stratified cheating simulation test device further includes a fifth pipeline 20, a sixth pipeline 21, a seventh pipeline 22, an eighth pipeline 23, a first valve 24, a mixing pump 25, a second valve 26, an observation pipe 27, a third valve 28, a fourth valve 29, a fifth valve 30, an oil-water separator 31, a ninth pipeline 32, a tenth pipeline 33, a sixth valve 34, and a thirteenth valve 35. One end of the fifth pipeline 20 is communicated with the bottom end of the tank body 1, and the other end is communicated with the sixth pipeline 21, the seventh pipeline 22, and the eighth pipeline 23 through a four-way joint. The other end of the sixth pipeline 21 is communicated with the oil container 5, the other end of the seventh pipeline 22 is communicated with the oil-water separator 31, and the other end of the eighth pipeline 23 is communicated with the water container 4. One ends of the ninth pipeline 32 and the tenth pipeline 33 are both communicated with the oil-water separator 31. The oil-water separator 31 is used to separate water and oil in the medium and discharge them into the corresponding water container 4 and oil container 5 respectively. The other end of the ninth pipeline 32 is communicated with the oil container 5, and the other end of the tenth pipeline 33 is communicated with the water container 4. The first valve 24, the mixing pump 25, the second valve 26, and the observation pipe 27 are sequentially arranged on the fifth pipeline 20. The mixing pump 25 is used to discharge the medium in the tank body 1 into the corresponding water container 4, oil container 5, or oil-water separator 31 respectively. The observation pipe 27 is used to observe the discharged medium in real time. The third valve 28 is installed on the sixth pipeline 21, the fourth valve 29 is installed on the seventh pipeline 22, the fifth valve 30 is installed on the eighth pipeline 23, the sixth valve 34 is installed on the ninth pipeline 32, and the thirteenth valve 35 is installed on the tenth pipeline 33.

[0022] Preferably, in one embodiment, a sampling pipe 36 is provided at the bottom end of the tank body 1, and a sampling valve 37 is provided on the sampling pipe 36.

[0023] A vertical storage tank stratified cheating simulation test device further includes a first regulating valve 38, and the first regulating valve 38 is installed on the fifth pipeline 20, between the second valve 26 and the observation pipe 27.

[0024] A vertical storage tank stratified cheating simulation test device further includes a second regulating valve 39, and the second regulating valve 39 is installed on the first pipeline 8, behind the eighth valve 13.

[0025] A vertical storage tank stratified cheating simulation test device further includes a third regulating valve 40, and the third regulating valve 40 is installed on the third pipeline 10, behind the twelfth valve 17.

[0026] Embodiment

[0027] 1. Cheating state simulation process

[0028] Inject a certain amount of test water into the water container 4, and inject a certain amount of test oil into the oil container 5 (the test oil should be non-toxic and not easily volatile, its density ρ1 is less than the density ρ2 of water, and it can aggregate and float on the water surface after being mixed with water, forming an obvious layer separation from water);

[0029] 1.1 Oil first then water

[0030] Open the seventh valve 11, the eighth valve 13, the ninth valve 14 and the oil pump 12, and use the second regulating valve 39 to control the instantaneous flow rate. Inject a certain amount of oil from the oil container 5 into the tank from the top metering port position of the tank body 1 until a certain oil layer liquid level height h01 (referred to as the distributed oil layer height) is reached, and then close the seventh valve 11, the eighth valve 13, the ninth valve 14 and the oil pump 12; or open the seventh valve 11, the eighth valve 13, the tenth valve 19 and the oil pump 12, and use the second regulating valve 39 to control the instantaneous flow rate. Inject a certain amount of oil from the oil container 5 into the tank from the bottom position until the distributed oil layer height h01 is reached, and then close the seventh valve 11, the eighth valve 13, the tenth valve 19 and the oil pump 12;

[0031] Open the eleventh valve 15, the twelfth valve 17 and the water pump 16, and use the third regulating valve 40 to control the instantaneous flow rate. Inject the water in the water container 4 into the tank from the bottom position of the tank. At this time, as the water level in the tank continuously rises, the injected oil layer in the tank is continuously pushed up by the water level. Wait until a certain water level height h02 (referred to as the distributed water layer height) is reached, and then close the eleventh valve 15, the twelfth valve 17 and the water pump 16.

[0032] 1.2 Water first then oil

[0033] Open the stop valve the eleventh valve 15, the twelfth valve 17 and the water pump 16, and use the third regulating valve 40 to control the instantaneous flow rate. Inject the water in the water container 4 into the tank from the bottom position of the tank. At this time, as the water level in the tank continuously rises, wait until the distributed water layer height h02 is reached, and then close the eleventh valve 15, the twelfth valve 17 and the water pump 16;

[0034] Open the seventh valve 11, the eighth valve 13, the ninth valve 14 and the oil pump 12, and use the second regulating valve 39 to control the instantaneous flow rate. Inject a certain amount of oil from the oil container 5 into the tank from the top metering port position of the tank until the distributed oil layer height h01 is reached, and then close the seventh valve 11, the eighth valve 13, the ninth valve 14 and the oil pump 12.

[0035] 1.3 Form a layered cheating state

[0036] At this time, the simulation of the stratified cheating state of the vertical storage tank is completed. When looking down from the metering hole at the top of the tank, the oil layer completely covers the water. When measuring the liquid level height with the dipstick 2 from the metering hole position, it will be mistakenly thought that the tank is full of oil, but in fact, there is only an oil layer with a limited thickness, and the rest is all water. This is the principle of the "water turning into oil" stratified cheating.

[0037] 2. Process of detecting cheating

[0038] For this kind of cheating method, open the sampling valve 37 and release some of the liquid in the tank from the sampling valve 37. If it is all oil (in on-site applications, if it is all oil or only a small amount of oil-water mixture), there is no problem of stratified cheating; if it is all water, there is suspicion of stratified cheating.

[0039] 3. Process of measuring the cheating amount

[0040] When suspecting stratified cheating, first measure the current liquid level as h3 (including the total liquid level height of the lower water layer and the upper oil layer) with the dipstick 2; then open the upper end of the auxiliary pipe 3 and wrap the lower end with an oil-resistant and corrosion-resistant film, and slowly insert the auxiliary pipe 3 vertically into the bottom of the tank body 1 from the metering hole position. During the process, pay attention not to pierce the lower film; when the auxiliary pipe 3 reaches the bottom of the tank body 1, insert a sharp object, such as a wire or a steel bar, from the upper end position to pierce the film at the bottom of the auxiliary pipe 3; then slightly lift the auxiliary pipe 3, keep it in a vertical state and fix it; at this time, under the action of pressure, the water at the bottom of the tank body 1 surges up from the bottom end of the auxiliary pipe 3 until the liquid pressures inside and outside the auxiliary pipe 3 are balanced. At this time, the inside of the pipe is all water, and the liquid level h4 measured with the dipstick 2 should be slightly lower than the liquid level h3 outside the tank. Measure the medium densities ρ1 and ρ2 in the oil container 5 and the water container 4. According to the liquid pressure principle, combined with h3, h4, ρ1, and ρ2, it is easy to obtain the measured oil layer height Measuring the water layer height Then, according to the tank capacity table of the vertical storage tank, the measured oil volume is V1 (unit: L) or the measured oil mass is M1 (unit: t), and the contained measured water volume is V2 (unit: L) or the measured water mass is M2 (unit: t).

[0041] 4. Process of reliability verification

[0042] 4.1 Verification operation 1

[0043] Verification operation 1 is applicable to laboratory simulation. Compare the measured oil layer height h1 (unit: mm) and the measured water layer height h2 (unit: mm) values with the allocated oil layer height h01 (unit: mm) and the allocated water layer height h02 (unit: mm) values respectively, so as to verify whether the process of measuring the cheating amount is reliable.

[0044] 4.2 Verification operation 2

[0045] The verification operation 2 is applicable to both laboratory simulations and on-site applications. Open the first valve 24, the second valve 26, the fifth valve 30, and the mixing pump 25. Control the instantaneous flow rate using the first regulating valve 38 to discharge the liquid medium in the tank 1 into the water container 4. At the same time, observe through the observation pipe 27. When the medium shows an oil-water mixture state, close the fifth valve 30, open the fourth valve 29, and continue to discharge the oil-water mixture into the oil-water separator 31. Observe through the observation pipe 27 at the same time. When all the emerging medium is oil, close the fourth valve 29, open the third valve 28, and continue to discharge the oil medium into the oil container 5. When all the oil medium in the tank 1 is discharged, close the first valve 24, the second valve 26, the third valve 28, and the mixing pump 25; discharge the oil and water separated by the oil-water separator 31 into the oil container 5 and the water container 4 respectively. At this time, measure the actual oil mass M01 (unit: t) and density ρ1 (unit: kg / m 3 ), the actual water mass M02 (unit: t) and density ρ2 (unit: kg / m 3 ) discharged. Furthermore, the actual oil volume V01 (unit: L) and actual water volume V02 (unit: L) discharged can be obtained. Compare V1 (unit: L), V2 (unit: L), M1 (unit: t), and M2 (unit: t) with V01 (unit: L), V02 (unit: L), M01 (unit: t), and M02 (unit: t) respectively to verify whether the cheating amount test process is reliable.

[0046] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. Refer to the method part for the relevant parts.

[0047] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vertical tank stratification cheating simulation test device, characterized in that: include: A tank body (1), an oil dipstick (2), an auxiliary pipe (3), a water container (4), an oil container (5), a first electronic scale (6), a second electronic scale (7), a first pipeline (8), a second pipeline (9), a third pipeline (10), a seventh valve (11), an oil pump (12), an eighth valve (13), a ninth valve (14), an eleventh valve (15), a water pump (16) and a twelfth valve (17); a metering hole is provided at the top of the tank body (1); the auxiliary pipe (3) passes through the metering hole and extends into the interior of the tank body (1) and approaches the bottom of the tank body (1); the oil dipstick (2) extends into the bottom of the tank body (1) or passes through the auxiliary pipe (3) and extends into the bottom of the tank body (1); the oil container (5) is placed on the first electronic scale (6). , one end of the first pipeline (8) extends into the oil container (5), and the other end is communicated with the second pipeline (9); the other end of the second pipeline (9) extends into the interior of the tank body (1) through the top of the tank body (1); the seventh valve (11), the oil pump (12) and the eighth valve (13) are arranged on the first pipeline (8) in sequence, and the ninth valve (14) is arranged on the second pipeline (9); the water container (4) is placed on the second electronic scale (7); one end of the third pipeline (10) extends into the water container (4), and the other end is communicated with the bottom of the tank body (1); the eleventh valve (15), the water pump (16) and the twelfth valve (17) are arranged on the third pipeline (10) in sequence.

2. A vertical tank stratification cheating simulation test device according to claim 1, characterized in that: The tank (1) further comprises a fourth pipeline (18) and a tenth valve (19); one end of the fourth pipeline (18) is connected to the connecting ends of the first pipeline (8) and the second pipeline (9) through a tee, and the other end of the fourth pipeline (18) is connected to the bottom end of the tank (1); and the tenth valve (19) is arranged on the fourth pipeline (18).

3. A vertical tank stratification cheating simulation test device according to claim 1, characterized in that: The tank body (1) further comprises a fifth pipeline (20), a sixth pipeline (21), a seventh pipeline (22), an eighth pipeline (23), a first valve (24), a mixing pump (25), a second valve (26), an observation tube (27), a third valve (28), a fourth valve (29), a fifth valve (30), an oil-water separator (31), a ninth pipeline (32), a tenth pipeline (33), a sixth valve (34) and a thirteenth valve (35), wherein one end of the fifth pipeline (20) is connected to the bottom end of the tank body (1), and the other end is connected to the sixth pipeline (21), the seventh pipeline (22) and the eighth pipeline (23) through a four-way connection; the other end of the sixth pipeline (21) is connected to the oil container (5); the other end of the seventh pipeline (22) is connected to the oil-water separator (31); the other end of the eighth pipeline (23) is connected to the water container (5); The ninth pipeline (32) and the tenth pipeline (33) are both connected to the oil-water separator (31), the other end of the ninth pipeline (32) is connected to the oil container (5), and the other end of the tenth pipeline (33) is connected to the water container (4); the first valve (24), the mixing pump (25), the second valve (26) and the observation tube (27) are arranged on the fifth pipeline (20) in sequence, the third valve (28) is installed on the sixth pipeline (21), the fourth valve (29) is installed on the seventh pipeline (22), the fifth valve (30) is installed on the eighth pipeline (23), the sixth valve (34) is installed on the ninth pipeline (32), and the thirteenth valve (35) is installed on the tenth pipeline (33).

4. A vertical tank stratification cheating simulation test device according to claim 1, characterized in that: A sampling tube (36) is provided at the bottom end of the tank body (1), and a sampling valve (37) is provided on the sampling tube (36).

5. A vertical storage tank stratification cheating simulation test device according to claim 3, characterized in that: The invention also comprises a first regulating valve (38), wherein the first regulating valve (38) is installed on the fifth pipeline (20) and is located between the second valve (26) and the observation tube (27).

6. A vertical storage tank stratification cheating simulation test device according to claim 1, characterized in that: The invention also comprises a second regulating valve (39), wherein the second regulating valve (39) is installed on the first pipeline (8) and is located after the eighth valve (13).

7. A vertical tank stratification cheating simulation test device according to claim 1, characterized in that: It also includes a third regulating valve (40), which is installed on the third pipeline (10) and located after the twelfth valve (17).

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