RU2305654C2 - Reservoir with floating surface for technological operations with oil or oil products - Google Patents

Abstract

FIELD: engineering of reservoirs, in particular, equipped with floating surface, namely, reservoir with floating surface for technological operations with oil or oil products, containing hermetic floats.

SUBSTANCE: floating surface is made in form of a ring of rigidly connected perimeter and radial-beam blocks, forming hollow sectors, hermetically closed by oil and gasoline resistant fabric. Blocks are clamped by strings, creating a mesh at the liquid surface level. Fabric sectors of cover lie on strings and on liquid surface, and to flush steam-gas-air locks, which get into reservoir under the cover from main pipeline and for preventing creation of vacuum under cover during its mounting on supports, float valves are installed on fabric sectors.

EFFECT: decreased metal costs of pontoon, increased efficiency of packing valve in terms of evaporation losses decrease and decreased losses of liquid to evaporation.

5 dwg

Description

The invention relates to tanks, in particular equipped with a floating coating.

A floating tank cover is known (see ed. Certificate of the USSR 1778040, MKI B65D 88/34, 1992, BI No. 44), containing float supports interconnected that are hollow, partitions are installed in the lower part of the supports, and in the upper part the cover is placed a metal ring for mounting on it platforms for servicing the floating roof.

The disadvantage is significant metal consumption and low reliability of the floating coating.

A technical solution is also known (see US Pat. No. 3,861,555 of January 21, 75), including tubular floats supporting beams, metal flooring, clamps, risers, a central rack shutter and a flexible seal against the tank wall.

The disadvantage is the increased volume of gas space, insufficient bearing capacity of the peripheral part of the floating coating.

The closest technical solution to the proposed invention is a floating coating for the tank (see ed. Certificate No. 2127216, MKI B65D 88/34, 1999), containing rows of rectangular floats connected by struts and supporting beams that are attached with clamps to brackets, peripheral floats with side, metal sheet flooring with pressure beams, end bracket for attaching the beams to the floating cover, a flexible sealing shutter of the floating cover and a central rack shutter.

The disadvantage is the high metal consumption of the floating coating, low bearing capacity and low reliability.

The purpose of the invention is to reduce the metal content of the pontoon, increase reliability, strength, increase the efficiency of the sealing device, preserve the annular shape, reduce the surface of evaporation of the liquid, ensure the discharge of vapor-gas plugs falling into the tank under the floating coating, and prevent the formation of vacuum under the floating coating when it is planted on the supports .

The goal is achieved in that:

- to reduce the metal consumption, the floating coating is made of rigidly connected blocks located along the outer contour in the form of a ring (perimeter blocks) and along the radius inside the ring (radial beam blocks) in order to form hollow sectors hermetically sealed with a gas-oil-resistant rubber-fabric material;

- to increase the reliability of the floating coating by excluding hollow elements from the design, the blocks are made of sealed metal boxes (floats) filled with rigid foamed polymeric material, such as polyurethane foam;

- to give strength to the floating coating, reduce the area of evaporation of the liquid (oil or oil) and increase the efficiency of the sealing device by maintaining the annular shape of the coating when the surface and level of the liquid fluctuate, the blocks are pulled together by strings (tie strings) that form a grid at the level of the liquid surface;

- to reduce the area of evaporation of the liquid, the fabric sectors of the coating supported by the strings lie on the surface of the liquid;

- for flooding gas-vapor plugs when they enter the tank under the floating coating from the main pipeline and prevent the formation of vacuum under the coating during pumping of the liquid after it is planted on supports on fabric sectors, float-type valves are installed.

Figure 1 shows a General view of the tank with a floating coating in section; figure 2 is a section I-I of figure 1; figure 3 - fabric sector from maslobenzostoyky material with a float valve, in the open state; figure 4 is the same, but the valve is in the closed state; figure 5 - valve float in the lowered state, providing access of air from the gas space of the tank under the cover.

The floating coating is made in the form of a ring of rigidly connected perimeter blocks 1, radial beam blocks 2, coupling strings 3, float valves 4 located on the fabric part of the sectors, fabric sectors of oil and gas resistant material 5, a sealing shutter 6, sliding on the wall of the tank 9, supporting racks 7 mounted on the bottom of the tank 8 motionless.

The tank with a floating coating works as follows.

A shutter 6 is installed around the perimeter of the coating to seal the gap between the wall of the tank 9 and the coating. In the normal position, the annular 1 and radial beam 2 coating units float on the surface of the stored liquid, the fabric sectors 5 lying on the grid, and also completely cover the surface on the surface of the liquid evaporation, thereby eliminating the loss of light fractions from evaporation.

When the surface of the liquid fluctuates from the action of a jet of incoming oil or oil product into the tank and level changes during the raising and lowering of the coating, the tie rods 3 ensure the strength and preservation of the annular shape of the perimeter blocks, thereby ensuring reliable and efficient operation of the pontoon's perimeter shutter. When the vapor-gas plug gets from the main pipeline into the tank, the vapor-gas bubble pops up, falls under the fabric sectors 5 of the coating and raises them. Under pressure, the valve float 4 of each tissue sector opens and the vapor-gas tube is discharged into the gas space of the reservoir (Fig. 3). After the plug is released, the valve closes under the influence of the float’s own weight and the fabric sector lowers onto the mesh, assuming the initial position (Fig. 4).

When lowering the floating coating on the supporting posts 7 installed on the bottom of the tank 8, and continuing the pumping process, the liquid level decreases and the valve float lowers, allowing the vapor-air mixture from the gas space of the tank to cover (Fig. 5), thereby eliminating the formation of vacuum under the coating and, accordingly, possible damage to the structures of the coating or tank.

With the resumption of filling the tank with oil or petroleum products, the liquid level rises and the vapor-gas mixture is displaced through the open float valve of each tissue sector into the gas space of the tank until the float completely pops up and the valve closes. The coating will pop up and begin to function normally.

Using the present invention will reduce the metal consumption of the floating coating, increase its reliability, efficiency, strength, and also ensure the preservation of its ring shape.

Claims (1)

A floating coating tank for technological operations with oil or petroleum products containing hermetic floats, characterized in that to reduce the metal consumption the floating coating is made in the form of a ring of rigidly connected perimeter and radial beam blocks forming hollow sectors hermetically sealed with an oil and petrol resistant fabric, and for imparting strength and safety to the annular shape of the floating coating when the surface and liquid level fluctuate, the blocks are pulled together by strings forming a grid at the level of rotation the liquid sectors, and to reduce the area of liquid evaporation, the fabric sectors of the coating lie on the strings and on the surface of the liquid, while for venting gas and vapor plugs falling into the tank under the coating from the main pipeline, and excluding the formation of vacuum under the coating when it is seated on supports on fabric sectors float valves installed.

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