RU131014U1 - GROUND VERTICAL RESERVOIR FOR OIL AND OIL PRODUCTS EQUIPPED WITH STATIONARY BOTTOM DIAGNOSTIC DEVICE - Google Patents

Abstract

A vertical ground tank for oil and petroleum products, equipped with a stationary bottom diagnostic device, characterized in that metal probes are installed in the soil under the tank bottom horizontally and perpendicular to each other at a certain distance and level, which are connected through the communication lines to the terminals of two electronic switches, while between the electronic switches to determine the resistance an ohmmeter is connected, as well as the fact that periodically yatsya alternate measuring resistances between the metal probes at different levels, which are abnormally low values allow to determine the presence of oil leakage from the tank bottom.

Description

The utility model relates to devices for storing oil and oil products and can be used in the petrochemical and oil industries.

The proposed utility model is most applicable for the storage of oil and oil products of various grades at oil-gathering stations and oil depots under construction and reconstruction, equipped with ground vertical steel tanks of large capacity (RVS).

Pollution of the lithosphere and hydrosphere occurs as a result of fuel leaks from reservoirs and pipelines, PBC overflows with oil products, spills from hoses, tankers and other reasons.

If a spill of fuel from the tank’s belts can be detected visually, then the leakage of oil products from the bottom of a ground-based PBC can be determined only by complex diagnostic methods. These methods are associated with the release of the tank from the fuel with the subsequent cleaning of the RVS and are carried out with a certain frequency on average 1 time in 5-8 years, depending on the life of the tank [1].

During operation, the bottom of the RVS is exposed to various types of corrosion, which are associated with the presence of sulfur and other aggressive compounds in oil and oil products, as well as water in the tank and in the ground.

Combating the loss of fuel from leaks through the bottom of the RCS is becoming an important environmental and economic challenge.

Known vertical cylindrical steel tank for light petroleum products [2]. This tank has a bottom, a wall and a fixed roof. For receiving and dispensing petroleum products, reservoirs of this type have acceptance pipes. From the outside, valves are connected to them. In order to provide “small” and “large” tank breaths, there is a breathing valve. A metering hatch is installed on the roof of the tank, which serves to measure the level and take fuel samples.

Also on the tank there are monitoring and signaling devices (level gauges, samplers, level indicators, fire-fighting devices) and other equipment (manhole, light sunroof, safety valves).

The disadvantages of this tank when storing oil and oil products are:

1. The absence of a device that prevents leakage of fuel from the bottom of the tank.

2. The absence of a device to diagnose the thickness of the bottom of the tank.

3. A high level of air pollution by vapors of petroleum products.

Also known is a portable device for operational monitoring and diagnostics of the bottoms of vertical steel tanks in operation [3]. The operation of this device is reduced to sensing the soil under the bottom of the tank with an oil product to identify the location of leaks of oil products at the place of detection of electrical anomalies. Electrical anomalies are associated with increased and decreased resistivity relative to the background value of the soil under the bottom of the tank. Anomalies with reduced resistivity relate to the accumulation of petroleum products. The technical device for operational monitoring and diagnostics of the bottoms of vertical steel tanks includes metal probes from 8 to 16 pieces, a cross cable, a meter of electrical quantities (ohmmeter), and also electrical connectors.

The device operates as follows. At equal intervals, metal probes are introduced into the soil around the base of the tank. An electrical meter (ohmmeter) is connected to the metal probes using electrical connectors using a cross-cable. Using metal probes and a meter of electrical quantities, a soil probe is performed under the tank bottom by measuring the resistance between adjacent pairs of probes in the sequence (1-2, 1-3, 1-4, 1-n, 2-3, 2-4, 2-5 , 2-n, 3-4, etc.). The data of the measurement results are entered in the table. Then, using the coefficients, the actual results are recalculated into specific units, which are also entered in the table. After that, abnormally low values of the indicators are selected and from them on the bottom sketch graphically determine the place of leakage of oil products.

The disadvantages of this device when diagnosing the bottom of the vertical steel tanks are:

1. The absence of this device in stationary tanks of oil depots and fuel depots.

2. Low accuracy of determination in the winter period, as well as in conditions of high soil moisture.

3. The duration and complexity of the determination.

Closest to the indicated problem is a ground-based vertical tank with a double bottom, equipped with a vapor recovery unit and a device for diagnosing the bottom [4].

To a tank having a receiving and distributing branch pipe, a pipeline for receiving and dispensing oil and oil products, valves, light and metering hatches, a pressure breathing valve, a manhole, an operating pressure breathing valve, an additional pipeline with a check valve and a valve connected to a recessed a reservoir with a low-octane component, the inner and outer bottom with stiffeners, an additional hydrophobic compound layer with a fiber optic distributed sensor is equipped on the inner bottom m pressure line connection which is connected to an optical reflectometer and a personal computer. The tank is equipped with a portable sound source with a cable. In this case, the sound source is connected via communication lines to an amplifier and a personal computer.

The device operates as follows. The oil enters the reservoir through the intake pipe. In this case, the fuel level begins to increase, and accordingly the volume of the steam space decreases.

After filling the tank, the volumes of fuel and steam space are stabilized.

In order to diagnose the internal bottom of the tank with an oil product with a certain frequency, which depends on the life of the tank, a sound source is lowered through a skylight with a cable, which is connected to the amplifier by communication lines and a personal computer.

The fiber-optic distributed pressure sensor is connected to an optical reflectometer and a personal computer, which can record mechanical changes along the length of the cable. Each cable section, depending on the mounting configuration, corresponds to a section of the tank bottom.

Waves created in the tank by a sound source propagate in a liquid medium (fuel) and a solid medium (bottom). The intensity of the transmitted sound waves will depend on the thickness of the liquid and solid media. When the transmitted sound wave interacts with a fiber-optic distributed pressure sensor, the latter causes mechanical stresses distributed along the length [5]. Assessing the intensity of stresses using recording equipment will make it possible to observe the distribution pattern of the thickness of the inner bottom and to evaluate the level of breakthrough hazard and potential fuel leakage by given parameters.

The disadvantages of the ground vertical tank with a double bottom, equipped with a vapor recovery unit and a device for diagnosing the bottom are:

1. Deposition on the bottom of water tanks, solids, resins, acids and other contaminants, which significantly reduces the accuracy of determination.

2. The high cost of equipment and instruments, as well as the duration, complexity and complexity of the determination.

3. The possibility of accumulation of explosive vapor-air mixtures between the bottoms, as well as increased metal consumption of the tanks.

The solution to this problem is achieved by the fact that in the soil under the bottom of the tank horizontally and perpendicular to each other at a certain distance and level are installed metal probes made of stainless metal alloys, which are connected via communication lines to the terminals of two electronic switches, while between the electronic switches to determine the resistance is connected an ohmmeter, as well as the fact that periodically alternating measurements of resistances between metal probes of different levels are performed, which, according to The extremely low values make it possible to determine the presence of oil leaks from the bottom of the tank.

These signs are essential for solving the utility model problem, since the efficiency of determining fuel leaks from the bottom of the tank without releasing it increases, timely repair of the internal combustion engine is planned, and the reliability of the operation of the tank farm increases.

The essence of the utility model is illustrated by drawings (FIG. 1, FIG. 2), which depict: sections of the reservoir, levels of metal probes with communication lines connected to electronic switches, an ohmmeter and a personal computer.

Under the proposed reservoir 1 (figure 1), with a receiving and distributing nozzles 2, a pipeline for receiving and dispensing oil and oil products 3, valves 4, light and metering hatches 5, 6, ventilation hatch 7, high pressure breathing valve 8, hatch a manhole 9, a breathing valve of working pressure 10, a bottom 11, additionally in the soil 12, at a certain distance from the bottom of the tank, metal probes of the first level 13 are horizontally equipped, perpendicular to which metal probes of the second level 14 are installed, while the metal probe different levels via communication lines 15 connected to electronic switch 16 having terminals 17 for connecting metal lines specific probes. Electronic switches using a communication line 18 are connected by a device for determining resistance by an ohmmeter 19, which is connected to a laptop computer 20 (figure 2).

The utility model works as follows. Through the intake pipe 3, the oil enters the tank 1. In this case, the fuel level 21 begins to increase, and accordingly the volume of the steam space 22 decreases. After filling the tank, the volumes of fuel and steam space are stabilized.

In order to diagnose the bottom 11 of the tank 1 with a set frequency, which depends on the life of the tank using communication lines 15 electronic switches 16 and an ohmmeter 19, successive measurements of resistances between metal probes 13, 14 of different levels are carried out, which are output to computer 20. In this case, each the measurement corresponds to your portion of the bottom of the tank 11.

Low resistivity values refer to the accumulation of petroleum products.

Evaluation of the resistance values between individual probes of different levels located perpendicular to each other using electronic switches, an ohmmeter and a computer allows us to determine not only the presence of a leak of oil products from the bottom of the tank, but also to identify a specific leak point in order to effectively repair the tank.

Literature

1. V.N. Zaichenko. New technologies for the repair of steel tanks. M .: OJSC TsNIITneftekhim, 2002.

2. L. A. Matskin et al. Operation of oil depots. M .: NEDRA, 1975 .-- 392 p.

3. D. D. Kostrovsky. Operation of military rocket fuel and fuel depots. M .: Military Publishing House, 1992 .-- 416 p.

4. Yu.A. Matveev, S.G. Novikov, I.O. Zolotovsky. Utility Model Patent No. 114674 dated April 10, 2012. “A vertical ground tank with a double bottom, equipped with an oil vapor vapor recovery unit and a device for diagnosing the bottom”.

5. Fiber optic technology: current status and new prospects: [collection of articles] / ed. S.A.Dmitriev. - 3rd ed., Revised. and add. / ed. S.A.Dmitrieva and N.N. Slepova. - Moscow: Fiber Optic Engineering LLC: Technosphere, 2010. - 607 p.

Claims (1)

A vertical ground tank for oil and petroleum products, equipped with a stationary bottom diagnostic device, characterized in that metal probes are installed in the soil under the tank bottom horizontally and perpendicular to each other at a certain distance and level, which are connected through communication lines to the terminals of two electronic switches, while between the electronic switches to determine the resistance an ohmmeter is connected, as well as the fact that periodically yatsya alternate measuring resistances between the metal probes at different levels, which are abnormally low values allow to determine the presence of oil leakage from the tank bottom.

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