RU55971U1 - UNIVERSAL DEVICE FOR DETERMINING THE LEVELS OF VARIOUS LIQUIDS IN RESERVOIRS - Google Patents

Abstract

The proposed utility model relates to measuring technique, in particular, to means for determining the liquid level, and can be used in the oil industry to determine the level of produced water in tanks with oil and viscous oil products.

The solution to this problem is achieved by the fact that a hollow cylinder is fastened to the tape measure with a measuring tape using an arm, inside of which a load is rigidly fixed at the lower end. The load serves to give a vertical position to the cylinder at the water-oil interface. The weight of the cylinder and the load is selected taking into account the densities of water and oil in such a way that, when immersed, the cylinder passes through a layer of oil and stops at the interface. It should be noted that the density of oil is different from the density of water.

The determination of the water level occurs when the cylinder reaches the upper layer of water, while the beginning of the measuring tape corresponds to the phase boundary. The oil in the tank envelops the measuring tape of the tape measure from the phase boundary to the upper layer of oil. The determination of the water level is carried out by subtracting from the value of the base height of the tank H _{0 the} readings obtained on the measuring tape of the tape measure from the upper edge of the tank to the water level H ₁ . At the same time, the amount of oil is measured from a zero value on the metering tape to the upper layer of H ₂ oil.

Description

The proposed utility model relates to measuring equipment, in particular, to means for determining the liquid level, and can be used in the oil industry to determine the amount of produced water in tanks intended for receiving, storing and dispensing oil and viscous oil products.

To determine the presence of water at the bottom of the tank, a metal portable sampler can be used [1]. Samplers are manufactured with a capacity of 1.1 and 0.5 liters. The 1.1 liter sampler has an inclined cover located on a rotating axis. The edges of the lid are tightly fitted to the cylinder wall to avoid the passage of oil products. On the cover there are rings for trigger cables and a sleeve for attaching a tape measure. To take a bottom sample, the sampler is lowered 250 mm above the bottom of the tank. Then open the lid, fill the sampler and lift it.

The disadvantage of this device is the low accuracy of determining the quantitative content of water in the tank, as well as the inability to determine when the water level in the tank is less than 250 mm

A universal device for determining the level of water and oil in tanks with a capacity of up to 100 m ³ [2]. The device contains a main meterstick of a smaller diameter, coated with water-based paste, an additional meterstick of a larger diameter installed in the support, which is rigidly connected with the main meterstock. In this case, a larger diameter meterstick has the ability to move relative to the main meterstock.

The disadvantage of this device is its low efficiency when used in tanks with a capacity of more than 100 m ³ , as well as difficulties with transporting the device to the place of use.

Also known is a device for determining the level of produced water in the tank [3]. This device contains a measured lot coated with a water-based paste, which is placed in a hollow inner cylinder with a longitudinal slot for the receipt of the oil product. The inner cylinder is sealed inside the outer cylinder. It should be noted that the outer cylinder has the ability to move relative to the inner cylinder using a cable. The disadvantages of this device are: the complexity of manufacturing and the complexity of the production of measurement, as well as low efficiency in the presence of a large water level.

The closest in technical essence of the proposed utility model is a device for determining the liquid level in tanks [4], including a flexible metal tape measure (GOST 7502-89) 10, 20, 30 meters long with a tape width of 10-12 mm with a measuring tape fixed in the lower part lot. The lot is used to tension the tape measure when measuring

oil product spill and for applying water-sensitive paste in order to determine the amount of produced water in the tank.

The disadvantage of this device is the fact that when lowering the lot, oil envelops the paste and prevents it from interacting with water. A similar process occurs when raising the lot from the bottom of the tank.

The proposed utility model solves the problem of increasing the efficiency of determining the level of produced water in tanks with oil (oil liquid) and viscous oil products.

The solution to this problem is achieved by the fact that instead of a lot, a hollow cylinder is attached to the measuring tape of the roulette with the help of an arm. A load is rigidly attached to the base inside the cylinder. The load serves to maintain the cylinder in an upright position at the phase boundary of the studied liquids. In the oil industry, the determination of water in an oil tank is of greatest interest. Therefore, the weight of the cylinder and the weight of the load are selected taking into account the density of oil and the density of water. It should be borne in mind that the density of oil and water have different values.

The selection of the cylinder and the load is carried out taking into account the conditions of zero immersion.

where Q _β is the buoyant force acting on the cylinder, N;

P ₁ - the weight of the cylinder, N;

P ₂ - the weight of the cargo, N;

q is the acceleration of gravity N / kg;

Y _B is the volume of the cylinder in water, m ³ ;

Y _H is the volume of the cylinder in oil, m ³ ;

ρ _B , ρ _H are the densities of water and oil, respectively kg / m ³ .

The weight of the cargo is determined from the expression:

The determination of the water level occurs after the cylinder reaches the oil-water phase boundary. Due to the selected mass, the cylinder penetrates through the oil layer and with the help of the load takes a vertical position in the upper layer of produced water. In this case, the beginning of the digital values of the roulette corresponds to the oil-water phase boundary. The determination of the water (oil) level is made according to the reading of the measuring tape. This tape measure will indicate the distance from the top of the tank to the water level H ₁ . In order to determine the amount of water, it is necessary to subtract the previously obtained value of H ₁ from the value of the base height of the tank H ₀ . The level of oil liquid is calculated by the value on the measuring tape left by the upper layer of oil N ₂ .

These signs are essential for solving the problem of the utility model, since the efficiency of determining the level of produced water in the tank with oil and viscous oil products increases, and the design of the proposed device is also simplified.

The essence of the utility model is illustrated by drawings (figure 1, figure 2), which shows the device in section and in the tank for storing oil.

The device comprises a tape measure 1 with a handle 2 and a measuring tape 3. A cylinder 5 is attached to the measuring tape using an arm 4. Inside the cylinder, the load 6 is rigidly fixed to the base.

Universal device works as follows. The cylinder, using the handle of the tape measure 1, is lowered into the reservoir 8 through the measuring hatch 7, and due to its weight, it reaches the oil-water phase boundary 9. With the help of the load, the cylinder takes a vertical position, while the beginning of the measuring tape coincides with the phase boundary. The determination of the water level is carried out by subtracting from the value of the base height of the tank H _{0 the} readings obtained on the measuring tape of the tape measure H ₁ .

It should be noted that the proposed device will work in environments of other liquids, for example, water - fuel oil, water - heating oil. In this case, the values of the weight of the cylinder and the load will be calculated based on the densities of the liquids used.

Literature

1. VG Kovalenko et al. Gas stations: Equipment. Exploitation. Security. SPb .: NPIKTS, 2003 - 280 s.

2. Patent for utility model No. 48058. Universal device for determining the level of water and oil in tanks with a capacity of up to 100 m.

3. Patent for utility model No. 46352. Device for determining the level of produced water in the tank.

4. Cooper V.A. and other operations with petroleum products. Gas stations. M .: Parity, 1999. S.205-207.

Claims (1)

A universal device for determining the levels of various liquids in tanks, containing a tape measure with a measuring tape and a cylinder, characterized in that the cargo is rigidly fixed inside the hollow cylinder, which serves to give the cylinder a vertical position at the liquid interface, it should be noted that the weight of the cylinder and the weight of the cargo are calculated taking into account different densities in this case, water and oil according to the formulas

where Q _β is the buoyant force acting on the cylinder, N; P ₁ - the weight of the cylinder, N; P ₂ - the weight of the cargo, N; q is the acceleration of gravity N / kg; YB - cylinder volume in water, m ³ ; YH — cylinder volume in oil, m ³ ; ρВ, ρH are the densities of water and oil, respectively, kg / m ³ .