RU2711714C1 - Block floating roof of reservoirs for technological operations with oil and oil products - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: invention relates to floating roofs of reservoirs for technological operations with oil and oil products, in particular, for tanks not equipped with stationary roofs, and concerns floating roofs consisting of tight units. Block floating roof is made in the form of a carpet consisting of blocks-boxes filled with rigid foam polymer material, along the perimeter under the carpet there fixed is a ring of connected circular blocks made of thin-sheet metal, inside of which there is a board of high-strength foam material, for example foamed glass, framed with rigid with closed micro cells polymeric foam material, resistant to oil and oil products, for example, foamed polyurethane, which completely fills the cavity of the block box, thus ensuring monolithic character and strength of the unit. Blocks of the floating roof carpet with their long sides are tightly connected to each other with detachable H-shaped profile by transverse planks, and by short sides are fixed on longitudinal profiled beams.EFFECT: improving reliability, strength, margin of buoyancy of perimeter part and in general block floating roof, improving repairability of floating roof and reservoir, in which block floating roof is installed.1 cl, 4 dwg

Description

The invention relates to floating roofs of tanks for technological operations with oil and oil products that are not equipped with fixed roofs.

The floating roofs of tanks are known (see GOST 31385-2016 Vertical cylindrical steel tanks for oil and oil products. General specifications).

- odnodechnye - consisting of sealed annular ducts around the perimeter of the roof and the central single-layer membrane;

- two-deckers - with radial or ring ducts;

- combined - with radial airtight boxes and one-deck inserts between them.

Hollow airtight boxes have inspection hatches with closed covers.

The disadvantage is the high metal content of the roofs, the need for operating personnel on the roof to periodically check the tightness of hollow ducts, and low reliability. The roof is practically not repairable, since replacing a defective area (deformed, rusted, having cracks in the seams, etc.) is complicated and time-consuming, associated with cutting out the membrane, deck or duct, and subsequent fitting and installation of new units.

The closest technical solution to the proposed invention is a "Tank with a floating block coating for technological operations with oil and oil products" (see RF patent No. 2364561 from 08.20.2009), containing a floating coating made in the form of floating blocks, the blocks are tight and filled with hard polymer material, the blocks are connected and fixed on the longitudinal beams, the beams are fastened with transverse ties, a stiffening ring of profile tops is fixed on the surface along the circumference at an equidistant distance from the shutter th and lower rings connected by a vertical wall.

The disadvantage is that the coating cannot be used in tanks without a fixed roof due to the lack of a rainwater drainage system, with rainfall, the coating will flood or deform, the edge of the perimeter part of the coating, where the perimeter shutter and stiffening ring having a certain weight are installed, has a lower buoyancy margin in comparison with the central part, insufficient tightness of the block connections to each other.

The purpose of the invention is to increase the strength and buoyancy margin of the perimeter of the block floating roof, increase the strength and tightness of the joints of the blocks, increase the maintainability of the roof and the tank in which the floating roof is installed.

The goal is achieved in that:

- under the perimeter of the block floating roof carpet, annular blocks are mounted fixed to each other in the form of sealed boxes of thin sheet metal, inside of which there is a plate of high-strength foam, such as foam glass, framed by a rigid polymeric material with closed microcells resistant to oil and oil products, such as polyurethane foam completely covering the internal cavity of the block, providing strength, solidity and buoyancy;

- floating roof carpet blocks with long sides hermetically connected to each other by removable “N” -shaped profiles with transverse trims, and short sides fixed to longitudinal profile, for example, t-channel profile, beams, providing strength in the longitudinal and transverse directions.

In FIG. 1 shows a general view of a block floating roof with ring blocks, FIG. 2 is a section 1-1 of FIG. 1, in FIG. 3 is a general sectional and plan view of an annular block containing a box 12, a plate 13, and a frame made of foam material 14, FIG. 4 - connection of roof carpet blocks with removable "H" -shaped cross-section profiles.

Located in the tank - 1 block floating roof consists of floating sealed blocks completely covering the liquid surface filled with polystyrene material - 2, the blocks are interconnected by removable "H" -shaped profiles with transverse bars - 9, and with short sides mounted on longitudinal profile beams - 10, annular blocks are fixed around the perimeter under the roof carpet - 8, a perimeter shutter - 3 and a foam baffle - 11 are installed on the roof carpet, intake drain valves - 6 and support racks are installed on the longitudinal beams and - 7, drain valves are connected to the roof drainage system - 4, safety valves - 5 are installed on the roof carpet to discharge gas-air plugs entering the tank from the supply pipe and to prevent the formation of vacuum under the roof when pumping the product after installing the floating roof on the supports , the safety valve is also emergency for discharging storm water into the tank when the capacity of the drainage system is exceeded.

Block floating roof works as follows: in the normal position, the blocks are partially submerged and float on the surface of the liquid, covering the surface of the evaporation. Ring blocks fixed under the carpet increase the buoyancy margin of the perimeter part in comparison with the central part of the roof carpet and raise the edge, creating a slope from the periphery to the center at the places where the drainage valves are installed. With the occurrence of natural precipitation, water through the drainage system is discharged outside the reservoir.

For example, blocks of a floating roof carpet measuring 3 × 0.9 meters 60 mm thick of 0.6 mm aluminum sheet, filled with polyurethane foam, are immersed in oil by 9-11 mm, i.e. the buoyancy margin in the central part of the roof carpet is about 6, and the peripheral part of the carpet with ring blocks also 60 mm thick from a 0.6 mm aluminum sheet with a 40 mm foam glass plate 2.8 × 0.7 meters in size is immersed in 25 -30 mm, with a buoyancy margin of about 8, i.e. the surface of the edge of the carpet is raised above the liquid level to a height of 90-95 mm, and the central part is 51-53 mm and a slope is created to the drain valves.

The roof carpet blocks are interconnected by long sides with removable “H” -shaped profiles with transverse strips, the shells of the blocks tightly fit into the grooves of the strips along the entire length, sealing the connection, and the blocks fixed on the short beams on the longitudinal beams provide tightness and increased strength in the longitudinal and transverse directions.

Carpet blocks and ring blocks are highly reliable, even in cases of box depressurization, for example, through holes with a sharp object, foamed polymer material with closed microcells resistant to oil and oil products ensures the buoyancy and integrity of the block, while maintaining the main function of the floating roof - reducing losses from fumes. A block floating roof consisting of blocks connected with removable strips with all the equipment installed on the carpet is easily dismantled and can be replaced with new ones. In addition, for the convenience of repairing the bottom or wall of the tank, by removing blocks in any part of the roof, “repair windows” of any size can be created, which ensures high maintainability of both the block floating roof and the tank in which the roof is installed.

Claims (1)

Block floating roof of tanks for technological operations with oil and oil products, containing a floating carpet covering the surface of the liquid, consisting of blocks in the form of airtight boxes filled with foam material, a perimeter gate and a drainage device with a drainage system, characterized in that to increase strength and buoyancy margin the perimeter of the roof, to improve the maintainability of the roof and the tank, a ring of interconnected blocks, bl the oks are made in the form of sheets of sheet metal, inside of which there is a plate of foam of increased strength, for example, foam glass, framed by a rigid polymeric material, resistant to oil and oil products, closed with microcells, for example, polyurethane foam, completely filling the cavity of the box, ensuring solidity, reliability and increased strength, floating roof carpet blocks with long sides are hermetically interconnected by removable H-shaped profiles with transverse trims, and by short sides and mounted on longitudinal profile beams, providing strength in the longitudinal and transverse directions.

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