CN209922080U - Oil leakage monitoring device at bottom of storage tank - Google Patents
Oil leakage monitoring device at bottom of storage tank Download PDFInfo
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- CN209922080U CN209922080U CN201920690970.7U CN201920690970U CN209922080U CN 209922080 U CN209922080 U CN 209922080U CN 201920690970 U CN201920690970 U CN 201920690970U CN 209922080 U CN209922080 U CN 209922080U
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Abstract
The utility model discloses a storage tank bottom oil leakage monitoring device, include: the PVC pipes with the holes are buried in the sand cushion layer at the bottom of the storage tank, and the plurality of PVC pipes with the holes are arranged in the sand cushion layer at intervals; the oil sensing cables are arranged in the perforated PVC pipes, and the number of the oil sensing cables is matched with that of the perforated PVC pipes; the cable end box is connected to the end part of the oil sensing cable, and the two end parts of the oil sensing cable are respectively connected with one cable end box; two ends of the connecting cable are respectively connected to the cable end boxes at one end parts of two adjacent oil-sensing cables; a terminal connecting cable, one end of which is connected to the cable end box at one end part of the outermost oil-sensing cable; and the alarm device is arranged outside the storage tank and is connected with the other end of the terminal connecting cable. The utility model has the advantages that: the leakage monitoring and alarming function at the bottom of the storage tank is realized, the leakage position can be estimated, the integrity and the operation safety of the storage tank are improved, the leakage monitoring at the bottom of the storage tank is more practical, and the equipment investment and the construction cost are reduced.
Description
Technical Field
The utility model relates to a pipe-line system technical field particularly, relates to a storage tank bottom oil leakage monitoring device.
Background
In the process of pipeline operation, oil at the bottom of the storage tank leaks due to reasons such as corrosion of a tank bottom plate, construction quality, material defects, foundation cracks and the like, and finally safety and environmental pollution accidents are forthcoming, so that great adverse effects are caused to the society and enterprises, and further, serious threats are brought to the life and property safety of people around the tank area. If the related information such as whether the bottom of the storage tank leaks or not is not known in time and is processed in time, the accident consequence is continuously aggravated, and serious environmental pollution and serious personal and property loss are caused.
For oil leakage at the bottom of a storage tank, in the past, leakage monitoring cannot be carried out in projects, and leakage problems cannot be found in time, so that relevant problems can be found only when serious accidents such as oil leakage, pollution and the like which can be observed by human eyes occur.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model aims to provide a storage tank bottom oil leakage monitoring device realizes that the monitoring is reported to the police bottom the storage tank, makes storage tank bottom oil leakage monitoring alarm speed more timely, the rate of accuracy is higher, improves storage tank and peripheral personnel and property safety.
The utility model provides a storage tank bottom oil leakage monitoring device, include:
the PVC pipes with the holes are buried in a sand cushion layer at the bottom of the storage tank, and the plurality of PVC pipes with the holes are arranged in the sand cushion layer at equal intervals;
the oil-sensitive cables are arranged in the perforated PVC pipes, and the number of the oil-sensitive cables is matched with that of the perforated PVC pipes;
the cable end boxes are connected to the end parts of the oil sensing cables, and the end parts of the two ends of the oil sensing cables are respectively connected with one cable end box;
two ends of each connecting cable are respectively connected to the cable end boxes at one end part of two adjacent oil sensing cables, and the oil sensing cables are connected end to end through the connecting cables;
a terminal connecting cable, one end of which is connected to the cable end box at one end part of the outermost oil-sensing cable;
and the alarm device is arranged outside the storage tank and is connected with the other end of the terminal connecting cable.
As the utility model discloses further improvement, feel oily cable and be the infiltration type cable, inside is the cable, and the outward coating has water proof and oily insulating material of penetrating.
As a further improvement, the alarm device includes signal generator, data acquisition card, signal processing circuit, treater and display, data acquisition card's input with signal generator's output inserts in the cable end box of outside oil sensing cable one end tip, data acquisition card's output with signal processing circuit's input is connected, signal processing circuit's output with the input of treater is connected, the output of treater with the display is connected.
As a further improvement, the storage tank bottom with be provided with the insulating layer between the sand bed course.
As a further improvement, the insulating layer is a tar sand layer.
As a further improvement, the bottom of the sand cushion layer is provided with a tamping layer.
As a further improvement of the utility model, the ramming layer is a backfill soil layer.
As a further improvement, the sand cushion bottom and be provided with the antiseep layer between the ramming layer.
As a further improvement of the utility model, the anti-leakage layer is an HDPE film.
The utility model has the advantages that:
the leakage monitoring and alarming function at the bottom of the storage tank can be realized, the leakage position can be estimated, the integrity and the operation safety of the storage tank are improved, the leakage monitoring at the bottom of the storage tank is more practical, and the equipment investment and the construction cost are reduced.
Drawings
Fig. 1 is a schematic structural view of an oil leakage monitoring device at the bottom of a storage tank according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the installation of the oil leakage monitoring device at the bottom of the storage tank according to the embodiment of the present invention.
In the figure, the position of the upper end of the main shaft,
1. a storage tank; 2. an oil sensing cable; 3. a cable end box; 4. connecting a cable; 5. the terminal is connected with a cable; 6. PVC pipe with hole; 7. an insulating layer; 8. a sand cushion layer; 9. an anti-leakage layer; 10. and (5) tamping the layer.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
As shown in fig. 1-2, the utility model discloses a storage tank bottom oil leakage monitoring device, include: the oil-sensitive cable comprises a PVC pipe 6 with a hole, an oil-sensitive cable 2, a cable end box 3, a connecting cable 4, a terminal connecting cable 5 and an alarm device.
Sense oily cable 2 and install in foraminiferous PVC pipe 6, sense the quantity of oily cable 2 and the quantity matching setting of foraminiferous PVC pipe 6, and every length of feeling oily cable 2 matches the design rather than the length of the foraminiferous PVC pipe 6 of installing, and the both ends of feeling oily cable 2 expose in the both ends of foraminiferous PVC pipe 6, are convenient for install cable end box 3. When the bottom plate of the storage tank 1 is corroded, perforated or cracked, oil leaks out from the bottom plate, and the leaked oil is contacted with the oil sensing cable 2 which is embedded in the bottom plate after permeating through the perforated PVC pipe 6.
The cable end box 3 is connected at the 2 tip of feeling oily cable, feels oily 2 both ends tip of cable and connects a cable end box 3 respectively. Two ends of the connecting cable 4 are respectively connected to the cable end boxes 3 at one end parts of two adjacent oil-sensing cables 2. One end of a terminal connecting cable 5 is connected to the cable end box 3 at one end of the outermost oil-sensing cable 2. The alarm device is arranged outside the storage tank 1 and is connected with the other end of the terminal connecting cable 5.
The cable end box 3 is used for connecting two sections of cables, and simultaneously locking and fixing the incoming and outgoing lines to play a role in water prevention, dust prevention and vibration prevention, so that the oil leakage monitoring device at the bottom of the whole storage tank can safely and reliably operate. In this embodiment, the oil sensor cable 2 is connected to the connection cable 4, and the oil sensor cable 2 is connected to the terminal connection cable 5. As shown in fig. 1, a plurality of oil sensing cables 2 are connected end to end through connecting cables 4, so that the plurality of oil sensing cables 2 form a whole continuous line, full coverage of leakage monitoring at the bottom of the whole storage tank 1 is realized, and detection information of each oil sensing cable 2 is conveniently transmitted to an alarm device through a terminal connecting cable 5.
In this embodiment, the oil sensing cable 2 is a permeable cable, the inside is a cable, and the outer surface is coated with a water-proof and oil-permeable insulating material, such as a perforated PVC material (a mesh structure formed by PVC fibers), when oil inside the storage tank 1 leaks, the oil leaks onto the oil sensing cable 2 through the perforated PVC pipe 6, the oil will permeate into the insulating material of the oil sensing cable 2, so that the electrical characteristics of the oil sensing cable 2 at the point change, such as the resistance value change, the impedance change, and the impedance change of the oil sensing cable 2 is accompanied with the change of an electrical signal (e.g., a voltage signal). The electrical signal of the change of the oil sensing cable 2 is compared with the electrical signal without leakage, and if the difference value exceeds a threshold value, the leakage at the position is determined. The detection and location is accomplished by calculating the location of the impedance change. By using the characteristics, whether the bottom plate of the storage tank 1 is corroded, perforated or cracked can be judged, and the approximate position of a leakage point can be positioned by using the change of the electrical characteristics of the oil sensing cable 2.
Set up foraminiferous PVC pipe 6 and be convenient for the installation and feel oily cable 2, for feeling oily cable 2 and provide first layer water proof insulating layer, the protection is felt oily cable 2 and is not influenced by soil moisture, also provides good chemical stability environment and insulating environment for feeling oily cable 2. The appearance of feeling oily cable 2 coats and is scribbled the insulating material of water proof and penetrating oil, provides the second water proof insulating layer for inside cable, protects inside cable not influenced by soil moisture, also provides good chemical stability environment and insulating environment for inside cable, ensures that inside cable can be in time, accurate emergence change with the electrical characteristic after the oil contact, does benefit to the oil leakage of real-time monitoring storage tank bottom plate.
The alarm device can be arranged outside the storage tank 1, so that the management of workers is facilitated. The alarm device comprises a signal generator, a data acquisition card, a signal processing circuit, a processor and a display, wherein the output end of the signal generator is connected into the cable end box 3 at one end part of the outermost oil sensing cable 2, the input end of the data acquisition card is connected into the cable end box 3 at one end part of the outermost oil sensing cable 2, the output end of the data acquisition card is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the processor, and the output end of the processor is connected with the display. The signal processing circuit comprises an amplifying circuit, a filter circuit and an analog-to-digital conversion circuit which are connected in sequence. The data acquisition card, the signal processing circuit and the processor can be integrally designed into a whole, such as a handheld terminal and the like, and an alarm threshold value, sampling time, a timing program and the like can be arranged on the data acquisition card, the signal processing circuit and the processor. The signal generator generates an excitation signal, the data acquisition card acquires an electric signal with the changed electrical characteristics of the oil sensing cable 2 and a reflected delay signal in real time, the signal processing circuit can receive the electric signal with the changed electrical characteristics of the oil sensing cable 2 and the delay signal in real time, in order to prevent the signals from being submerged, the signal processing circuit uses a preamplifier and a post-amplifier to amplify the signals, extracts a voltage signal with the changed impedance and the delay signal from a noise signal, and adopts a filter circuit to filter the signals, analog-to-digital conversion is carried out, the converted voltage signal and the delayed signal are sent to a processor for calculation, and comparing with a preset alarm threshold, when the difference exceeds the voltage signal threshold, calculating to obtain the impedance and position of the leakage point, and simultaneously, the time domain waveform of the reflected signal processed by the signal processing circuit is displayed on a display, and an alarm is triggered and the leakage degree and the leakage position of the leakage point are displayed. The difference value is compared with a threshold value, and the leakage degrees of low, medium and high levels can be set, so that the worker can know the leakage degree in time and respond to the corresponding degree.
The specific calculation theory of the processor is as follows: the difference of the structural size of each point of the cable along the length direction leads to different resistance values of each point, that is to say, the impedance of each point is different, the impedance reflects the time domain of the uneven impedance of the cable, that is, the characteristic in the length direction, and if the characteristic impedance on the transmission path changes during the transmission process of the signal, the signal will be reflected at the node where the impedance is discontinuous. When energy is transmitted along the oil-sensing cable 2 and meets the impedance change of the leakage point, part of the energy is reflected back, and the impedance Z of the leakage point and the reflection coefficient rho of the oil-sensing cable (namely the reflection wave voltage V of the leakage point)Inverse directionIncident wave voltage V with signal generatorIntoThe ratio) satisfies the following relationship:
wherein Z is the leakage point impedance value, Z0Rho is a reflection coefficient for the output impedance of a measuring instrument, wherein the incident wave voltage is known, the value of the reflection coefficient can be calculated as long as the reflected wave voltage of a leakage point is measured, namely the voltage signal acquired by the data acquisition card, and the output impedance is known (the value is measured after the oil leakage monitoring device at the bottom of the whole storage tank is installed), so that the impedance value of the leakage point can be calculated.
According to the transmission delay of the leakage point, the position of the leakage point can be calculated by the transmission delay value:
wherein L is the length of the signal generator from the leakage point, V is the transmission speed of the signal in the oil sensing cable 2, T is the time delay value read by the measuring instrument, C is the light speed, and epsilonrIs the dielectric constant of the oil-sensing cable 2.
Furthermore, the sand cushion layer 8 is a supporting layer which adopts medium coarse sand, broken stone, pebble and the like with good gradation and hard texture and is tamped in layers as a foundation.
Further, an insulating layer 7 is arranged between the bottom of the storage tank 1 and the sand cushion layer 8. Preferably, the insulating layer 7 is a tar sand layer.
Further, a tamping layer 10 is arranged at the bottom of the sand cushion layer 8. Preferably, the rammed layer 10 is a backfill layer.
Further, an anti-leakage layer 9 is arranged between the bottom of the sand cushion layer 8 and the tamping layer 10. Preferably, the leakage-preventing layer 9 is a HDPE film.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a storage tank bottom oil leakage monitoring device which characterized in that includes:
the storage tank comprises perforated PVC pipes (6) which are buried in a sand cushion layer (8) at the bottom of the storage tank (1), and the perforated PVC pipes (6) are arranged in the sand cushion layer (8) at equal intervals;
the oil sensing cables (2) are installed in the perforated PVC pipes (6), and the number of the oil sensing cables (2) is matched with that of the perforated PVC pipes (6);
the cable end box (3) is connected to the end part of the oil sensing cable (2), and the end parts of the two ends of the oil sensing cable (2) are respectively connected with one cable end box (3);
two ends of each connecting cable (4) are respectively connected into the cable end boxes (3) at one end parts of two adjacent oil sensing cables (2), and the oil sensing cables (2) are connected end to end through the connecting cables (4);
a terminal connecting cable (5), one end of which is connected to the inside of the cable end box (3) at one end part of the outermost oil-sensing cable (2);
and the alarm device is arranged outside the storage tank (1) and is connected with the other end of the terminal connecting cable (5).
2. The oil leakage monitoring device at the bottom of the storage tank according to claim 1, wherein the oil sensing cable (2) is a permeable cable, the inside of the cable is a cable, and the outside of the cable is coated with a water-proof and oil-permeable insulating material.
3. The oil leakage monitoring device at the bottom of the storage tank, according to claim 1, is characterized in that the alarm device comprises a signal generator, a data acquisition card, a signal processing circuit, a processor and a display, wherein the input end of the data acquisition card and the output end of the signal generator are connected into a cable end box (3) at one end of the outermost oil sensing cable (2), the output end of the data acquisition card is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the processor, and the output end of the processor is connected with the display.
4. The storage tank bottom oil leakage monitoring device according to claim 1, characterized in that an insulating layer (7) is arranged between the bottom of the storage tank (1) and the sand cushion (8).
5. The tank bottom oil leakage monitoring device according to claim 4, characterized in that the insulating layer (7) is a tar sand layer.
6. The oil leakage monitoring device at the bottom of the storage tank is characterized in that a tamping layer (10) is arranged at the bottom of the sand cushion layer (8).
7. The tank bottom oil leakage monitoring device according to claim 6, characterized in that the ramming layer (10) is a backfill layer.
8. The oil leakage monitoring device at the bottom of the storage tank according to claim 6, characterized in that an anti-leakage layer (9) is arranged between the bottom of the sand cushion layer (8) and the tamping layer (10).
9. The tank bottom oil leakage monitoring device of claim 8, characterized in that the leakage-proof layer (9) is a HDPE film.
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| CN201920690970.7U CN209922080U (en) | 2019-05-15 | 2019-05-15 | Oil leakage monitoring device at bottom of storage tank |
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| CN201920690970.7U CN209922080U (en) | 2019-05-15 | 2019-05-15 | Oil leakage monitoring device at bottom of storage tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110203574A (en) * | 2019-05-15 | 2019-09-06 | 中国石油天然气集团有限公司 | A kind of tank bottom oil leak monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110203574A (en) * | 2019-05-15 | 2019-09-06 | 中国石油天然气集团有限公司 | A kind of tank bottom oil leak monitoring device |
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