RU2365534C1 - Service fluids reservoir with floating cover - Google Patents

Abstract

FIELD: storage reservoirs.

SUBSTANCE: invention relates to floating-coat reservoirs intended to keep fluids, for example oil and oil products. Reservoir floating cover comprises a ballast flow-type support representing a cylinder. Hole for ballast to be fed into and drained from the said ballast cylinder is arranged above the cover level. Hollow sectional boxes of circular peripheral float are densely packed by detachable blocks of foamed polymer material, e.g. polyurethane foam.

EFFECT: higher safety and reliability, normal operation of floating coat in puncture of cover or sectional hollow box.

3 dwg

Description

The invention relates to the field of transportation and storage of liquids, such as oil and petroleum products, in tanks equipped with a floating coating.

A floating roof is known (see steel reservoir RVSP - 20000, model project 704-1-171-84 developed by TsNIIPSK), containing a pontoon carpet of steel sheet, around the perimeter of which there is an annular float in the form of sectional hollow boxes, and the base of the boxes is at a level pontoon carpet.

The disadvantage is the low reliability in case of violation of the tightness of the bases of hollow floats or a pontoon carpet below the liquid level, for example, with the formation of a crack or due to a defect in the metal, buoyancy is lost and it is flooded, skewed and immersed in the liquid.

A technical solution is known (see RF patent No. 2140386 C1 "Method for controlling the buoyancy of a floating roof in a tank for oil and oil products", 1999), in which an adjustable heat-insulating gas layer is created between the floating roof and the liquid level by supplying or aspirating a gas medium through a special unit consisting of a valve, a pressure gauge and a siphon connected to a heat-insulating gas layer.

The disadvantage is the lack of reliability, with a violation of the tightness of the coating, constant pumping of the gaseous medium under the coating is necessary.

The closest technical solution to the proposed invention is a "Tank for storing oil and petroleum products" (see AS SU No. 1778040 A1, 1992), containing a cylindrical body with a floating roof placed on it, on which there are rigidly interconnected hollow float supports, in each of which in the lower part there is a partition for sealing the float.

The disadvantage is the lack of reliability, when the roof leaf is depressurized, it is immersed in the liquid and evaporation losses increase, repair of the coating is difficult without emptying the tank.

The purpose of the invention is to increase the reliability and maintain the operability of the floating coating during depressurization of the carpet (canvas) of the coating or perimeter float, made in the form of an annular section box.

This goal is achieved in that the tank with a floating coating containing a sealed carpet of sheet material, around the perimeter of which there is an annular float in the form of sectional ducts, hermetically connected to the carpet, support legs, a float valve for displacing air from under the carpet, discharging gas that enters under the cover from the main supply pipe, and to prevent the formation of vacuum under the cover when it is planted on the supports and continued pumping, it is equipped with a ballast float support, germ connected to the carpet, made in the form of a cylinder with a bottom with a stand for passing dense deposits at the bottom of the tank and relieving stresses on the coating from the dead weight of the float support with ballast when the floating coating is in the lower position, the cylinder bore through which the ballast is loaded or removed, is located above the level of the carpet with a floating coating to prevent liquid from entering the cylinder during the depressurization of the carpet, and the hollow boxes of the annular float are densely filled with removable foam-polymer blocks a material such as polyurethane foam.

Figure 1 shows a General view of the tank with a floating coating in section with a ballast float support, not loaded with ballast; figure 2 is the same, but loaded with ballast; figure 3 is a view along arrow A.

A tank 1 with a floating coating made in the form of a carpet 7, made of sheet material, along the perimeter of which there is an annular float from section boxes 2, hermetically connected to the carpet, a shutter 4 is installed around the perimeter of the coating, the floating coating contains supporting posts 3, a float valve 6, ballast float support in the form of a cylinder with a bottom 8 and a stand 12, on the cylinder cover there is an opening 9 for loading and unloading ballast 10. The hollow boxes of the annular float are densely filled with removable foam blocks imernogo material 11.

The tank with a floating coating works as follows.

Before filling the tank with liquid, the coating is in the lower position on the supports 3, and the ballast float support is on the rack 12, the float support is not filled with ballast 10, the hollow boxes of the annular float 2 are densely filled with removable blocks of foam material 11.

With the filling of the tank with liquid, the floating coating pops up and takes the position shown in Fig. 1, the coating carpet is above the liquid, there is a gas layer of thickness δ between the surface of the liquid and the carpet, the evaporation surface is open. The ballast float support through the hole 9 is filled with ballast 10, the gas is displaced through the float valve 6, and the carpet is lowered to the surface of the liquid covering the surface of evaporation.

In the normal position, Fig. 2, the coating carpet lies on the liquid surface and completely, with the exception of the annular surface under the shutter 4, covers the evaporation surface, i.e. almost completely eliminates losses from the evaporation of the liquid.

When the coating carpet is depressurized during operation, for example, with the formation of a crack or cavity, the liquid will fill the surface area of the coating carpet and, as it evaporates, will be replenished with incoming liquid from under the carpet. To prevent liquid from reaching the surface of the carpet, part of the ballast 10 is removed through the opening 9 and the coating carpet floats to a minimum height above the surface of the liquid.

To improve the repair conditions of the carpet (cracks, caverns, etc.) without emptying the tank, the ballast float support is completely freed from the ballast and the coating is raised to a maximum height above the liquid surface.

The dense filling of the hollow boxes of the annular perimeter float 2 with removable blocks of foam material 11 allows you to maintain the buoyancy of the floating coating during depressurization of the boxes and improve the repair conditions of the box by dismantling the removable blocks.

When lowering the floating coating and placing it on the supports 3, the ballast float support 12, piercing dense deposits, such as paraffin sludge in oil tanks, becomes on the bottom of the tank and unloads the coating from the dead weight of the float bearing with ballast while continuing the pumping process.

The use of the present invention will improve reliability and maintain the performance of a floating coating during depressurization of a carpet or box perimeter ring sectional float.

Claims (1)

A tank with a floating coating for technological operations, containing a sealed carpet of sheet material, around the perimeter of which there is an annular float in the form of sectional hollow boxes, support legs, a float valve for displacing gas from under the carpet, discharging gas falling under the cover from the main supply pipe and to prevent the formation of vacuum under the coating when it is planted on the supports and continued pumping, characterized in that, in order to increase reliability and maintain health melt When depressurizing a carpet or a hollow box of an annular float, the floating coating is equipped with a ballast float that is hermetically connected to the carpet, made in the form of a cylinder with an airtight bottom with a stand for puncturing dense deposits and unloading the coating from its own weight with ballast while the coating is in the lower position on the supports and the continuation of the pumping process, the cylinder bore through which the ballast is loaded or removed is higher than the level of the carpet, and the hollow annular ducts the float is tightly filled with removable blocks of foam material.

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