CN113928740A - Inflatable oil-free air sealing structure of external floating roof oil tank - Google Patents
Inflatable oil-free air sealing structure of external floating roof oil tank Download PDFInfo
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- CN113928740A CN113928740A CN202111216809.4A CN202111216809A CN113928740A CN 113928740 A CN113928740 A CN 113928740A CN 202111216809 A CN202111216809 A CN 202111216809A CN 113928740 A CN113928740 A CN 113928740A
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- inflatable
- capsule
- sealing structure
- oil
- floating roof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
- B65D88/42—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle
- B65D88/48—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle with fluid means acting on the seal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
- B65D88/42—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle
- B65D88/50—Large containers having floating covers, e.g. floating roofs or blankets with sealing means between cover rim and receptacle with resilient foam or stuffed seal
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tents Or Canopies (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention belongs to the technical field of fire safety of oil storage tanks, and particularly relates to an inflatable oil-free air sealing structure of an external floating roof oil tank. The technical scheme is as follows: an inflatable oil-free air sealing structure of an external floating roof oil tank comprises an annular primary sealing structure and an annular secondary sealing structure which are connected to a floating disc, wherein the primary sealing structure and the secondary sealing structure are positioned between a tank wall and the floating disc; the secondary sealing structure is connected with an inflatable capsule, an embedded connecting nut is fixed in the inflatable capsule, the secondary sealing structure comprises a rain baffle, one end of the rain baffle is connected to the floating plate, and the embedded connecting nut is connected with the rain baffle through an inflatable capsule fixing piece. One end of the inflatable capsule fixing piece is connected with the embedded connecting nut, and the other end of the inflatable capsule fixing piece penetrates through the rain baffle, the hole positions for supporting the limiting plate and the oil separating film and is fixed on the rain baffle, so that the reliable connection is guaranteed. The invention provides an inflatable oil-free air sealing structure of an external floating roof oil tank.
Description
Technical Field
The invention belongs to the technical field of fire safety of oil storage tanks, and particularly relates to an inflatable oil-free air sealing structure of an external floating roof oil tank.
Background
An annular gap of 250mm is formed between the outer edge plate of the floating roof of the outer floating roof oil tank and the oil tank wall plate, and the gap is a necessary space for the floating roof to move up and down, so that the floating roof can be lifted and floated normally. However, this gap forms an annular space with exposed oil surface, which is in contact with the atmosphere and becomes a major factor in the evaporation loss of the oil. In order to prevent the exposed oil surface in the annular space from contacting the atmosphere and prevent the evaporation of oil and gas, a sealing device is usually arranged in the annular space. The sealing device of the external floating roof oil tank generally adopts a double-sealing mode. One-time sealing is used for directly sealing the oil surface, and is the most main sealing measure. In 1970-2000, with frequent occurrence of safety accidents such as fire disasters of the external floating roof oil tank and the like and the requirement for energy conservation, secondary sealing is generated, namely, a secondary seal is added on the prior sealing device to form double sealing. The formed double seal has good adaptability and sealing effect, and effectively prevents evaporation loss.
Both the american API 650 annex C and the japanese JISB 8501 document require the use of primary and secondary sealing means, and the national standard GB 50737 "oil reservoir design specification" 7.5.7.1 also mentions that the sealing means should consist of a primary seal and a secondary seal. Leading technical guideline for storage tanks for light petroleum products (trial) in 3.7.11 also mentions "provision of primary and secondary seals for floating-roof tanks". At present, under the actual production management operation condition of large-scale petroleum storage tanks in China, the edge of a floating plate is basically provided with a primary sealing device and a secondary sealing device as shown in figure 5. Wherein, the primary sealing device comprises primary sealing filler and a primary sealing wrapping tape. The primary sealing filler and the primary sealing wrapping belt are fixed at the outer edge plate of the floating roof. The secondary sealing device comprises an oil separating film, a rain baffle, a fixing bolt and a sliding sheet, wherein one end of the secondary sealing device is fixed at the outer floating roof edge plate, and the other end of the secondary sealing device is attached to the wall of the oil tank.
However, in the actual operation of the external floating roof oil tank, due to the floating and sinking and deformation of the tank body, or the aging and damage of the primary seal, and the continuous volatilization of the residual oil on the tank wall, oil gas accumulation often occurs in the space between the primary seal device and the secondary seal device of the external floating roof oil tank, and partial concentration even exceeds the oil gas explosion lower limit, at this moment, ignition sources such as thunder, static electricity, open fire and the like are met, and the explosion accident of the seal ring can be caused. Sealing ring burning explosion accidents caused by lightning strike occur at home and abroad, the ratio of the occupied statistical data is extremely high, and the safe operation of the external floating roof oil tank is seriously threatened.
In order to prevent the occurrence of the explosion accident of the sealing ring, on one hand, the generation of an ignition source is stopped, and particularly, the lightning strike is prevented; on the other hand, forced ventilation or nitrogen introduction is adopted to reduce oil gas accumulation between the primary seal and the secondary seal. However, due to technical, engineering and construction quality reasons, the two measures cannot be completely solved. Therefore, the hidden danger of burning and explosion of the sealing ring of the external floating roof oil tank exists objectively and cannot be eradicated completely. Therefore, a new method is needed to be developed, the incidence rate of the burning and explosion accidents of the sealing ring is reduced, and the harm of the sealing ring is reduced.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides an inflatable oil-free airtight structure of an external floating roof tank.
The technical scheme adopted by the invention is as follows:
an inflatable oil-free air sealing structure of an external floating roof oil tank comprises an annular primary sealing structure and an annular secondary sealing structure which are connected to a floating disc, wherein the primary sealing structure and the secondary sealing structure are positioned between a tank wall and the floating disc; the secondary sealing structure is connected with an inflatable capsule, an embedded connecting nut is fixed in the inflatable capsule, and the embedded connecting nut is connected with the rain baffle through an inflatable capsule fixing piece. One end of the inflatable capsule fixing piece is connected with the embedded connecting nut, and the other end of the inflatable capsule fixing piece penetrates through the rain baffle, the hole positions for supporting the limiting plate and the oil separating film and is fixed on the rain baffle, so that the reliable connection is guaranteed.
As a preferred scheme of the invention, the inflatable capsule fixing piece is of a hollow structure, the inflatable capsule fixing piece is communicated with the inflatable capsule, and one end of the inflatable capsule fixing piece, which extends out of the secondary sealing mechanism, is connected with an inflation/exhaust joint. The inflation/deflation joint is inflated to keep the air pressure inside the inflatable capsule stable and maintain the expansion external dimension of the inflatable capsule.
In a preferred embodiment of the present invention, a filling capsule assembly is disposed between the upper portion of the inflatable capsule and the secondary sealing structure, and the filling capsule assembly is connected to the secondary sealing structure.
The filling capsule component makes the outer surface and the peripheral contact surface tightly attached by means of the elasticity of the material. The inflatable capsule can be inflated by gas with certain pressure, the internal air pressure enables the inflatable capsule to expand, and the outer surface of the inflatable capsule is tightly attached to the contact surface of the periphery. The structural outline of the filling capsule and the inflatable capsule is matched with the oil-gas space outline, and the filling capsule, the inflatable capsule, the oil-gas space formed by the primary sealing structure, the secondary sealing structure, the floating disc and the tank wall can be eliminated in a cooperative and closed occupying mode, so that the oil product volatile gas is prevented from overflowing from the edge of the floating disc, and the unorganized emission of VOCs is reduced. The filling capsule is combined with the inflation capsule, so that the oil-gas space can be eliminated to the maximum extent, the possibility of explosion accidents is reduced, and the fireproof and explosion-proof capability of the storage tank is improved.
As a preferred scheme of the invention, a supporting and limiting plate is clamped between the inflatable capsule and the floating plate, the upper section of the supporting and limiting plate is horizontally arranged, and the upper section of the supporting and limiting plate is positioned between the inflatable capsule and the filling capsule assembly. A plurality of supporting limiting plates are arranged in the oil gas space at certain intervals, and sharp edges of sharp corners are flexibly processed. The support limiting plate can play a supporting role in the filler capsule and can play a limiting role in the inflatable capsule structure.
As a preferable scheme of the invention, the filling capsule assembly comprises a filling capsule wrapping belt, two ends of the filling capsule wrapping belt are both tightly pressed between the rain baffle and the sliding sheet, and a filling capsule is arranged in the filling capsule wrapping belt. Before the filling capsules are installed, the filling capsule wrapping belts are processed, and two ends of the filling capsule wrapping belts are attached and perforated. The preparation in the earlier stage is completed, the filling capsule is wrapped by a filling capsule wrapping belt, two ends of the filling capsule are drawn together and attached, and the filling capsule, the sliding sheet, the rain baffle and the oil separation film are locked and fixed together through the fixing bolt.
As a preferable scheme of the invention, the material of the filling capsule is flame-retardant polyurethane; the packing belt of the packing capsule is made of synthetic rubber.
As a preferable scheme of the invention, the material of the inflatable capsule is reinforced rubber.
The invention has the beneficial effects that:
1. the inflatable capsule can be inflated by gas with certain pressure, the internal air pressure enables the inflatable capsule to expand, and the outer surface of the inflatable capsule is tightly attached to the contact surface of the periphery. The inflatable capsule eliminates the oil-gas space, prevents the volatile gas of the oil product from overflowing from the edge of the floating disc, thereby reducing the unorganized emission of VOCs.
2. The filling capsule component of the invention leads the outer surface to be tightly attached to the peripheral contact surface by the elasticity of the material. The structural outline of the filling capsule and the inflatable capsule is matched with the oil-gas space outline, and the filling capsule, the inflatable capsule, the oil-gas space formed by the primary sealing structure, the secondary sealing structure, the floating disc and the tank wall can be eliminated in a cooperative and closed occupying mode, so that the oil product volatile gas is prevented from overflowing from the edge of the floating disc, and the unorganized emission of VOCs is reduced. The filling capsule is combined with the inflation capsule, so that the oil-gas space can be eliminated to the maximum extent, the possibility of explosion accidents is reduced, and the fireproof and explosion-proof capability of the storage tank is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is an enlarged view of part B of FIG. 1;
FIG. 4 is a schematic view of the charge/discharge coupling position;
fig. 5 is a schematic view of a conventional external floating roof tank sealing structure.
In the figure, 1-floating plate; 2-primary sealing and filling; 3-primary sealing a belting; 4-a rain shield; 5-oil separation film; 6-inflating the capsule holder; 7-embedding a connecting nut; 8-supporting a limit plate; 9-fixing the bolt; 10-a slide; 11-filled capsules; 12-packing a capsule belt; 13-gas filled capsules; 14-a tank wall; 15-fill/vent connection.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 2 to 5, the external floating roof oil tank includes a tank wall 14, and a floating plate 1 is provided in the tank wall 14. The inflatable oil-free air sealing structure of the external floating roof oil tank comprises an annular primary sealing structure and an annular secondary sealing structure which are connected to the floating disc 1, wherein the primary sealing structure and the secondary sealing structure are positioned between the tank wall 14 and the floating disc 1; the secondary sealing structure is connected with an inflatable capsule 13, a filling capsule assembly is arranged between the upper part of the inflatable capsule 13 and the secondary sealing structure, and the filling capsule assembly is connected to the secondary sealing structure.
The filling capsule component makes the outer surface and the peripheral contact surface tightly attached by means of the elasticity of the material. The inflatable capsule 13 can be inflated by gas with certain pressure, the internal air pressure enables the inflatable capsule 13 to expand, and the outer surface of the inflatable capsule 13 is tightly attached to the contact surface of the periphery. The structural outline of the filling capsule 11 and the inflatable capsule 13 is matched with the oil-gas space outline, and the filling capsule is matched with the oil-gas space outline and is in cooperation and closed occupation, so that the oil-gas space formed by the primary sealing structure, the secondary sealing structure, the floating disc 1 and the tank wall 14 can be eliminated, the oil volatilization gas is prevented from overflowing from the edge of the floating disc 1, and the unorganized emission of VOCs is reduced. The filling capsule 11 is combined with the inflatable capsule 13, so that the oil-gas space can be eliminated to the maximum extent, the possibility of explosion accidents is reduced, and the self fireproof and explosion-proof capability of the storage tank is improved.
The inflatable capsule 13 is made of reinforced rubber materials, the mounting surface is thickened, and the embedded connecting nut 7 is embedded in the mounting surface. Before the inflatable capsule 13 is installed, the rain baffle 4 is detached to punch, and the oil separation film 5 and the holes for supporting the limiting plates 8 are processed simultaneously. The preparation in the early stage is completed and the gas-filled capsule 13 is put into the oil and gas space. One end of the inflatable capsule fixing piece 6 is connected with the embedded connecting nut 7, and the other end of the inflatable capsule fixing piece penetrates through the hole sites of the rain shield 4, the supporting limiting plate 8 and the oil separation membrane 5 and is fixed on the rain shield 4. An inflation/deflation joint 15 is installed at a selected position on the inflatable bladder 13. The charging/discharging joint 15 adopts a detachable joint form, can be replaced when a fault occurs, and is convenient and fast to operate.
And a plurality of supporting limit plates 8 are arranged in the oil-gas space at certain intervals, and sharp edges of sharp corners are flexibly processed. Can support the filling capsule 11 and limit the inflatable capsule 13.
Before the filling capsules 11 are installed, filling capsule wrapping belts 12 are processed, and two ends of the wrapping belts are attached and perforated. The preparation in the early stage is completed, a filling capsule wrapping belt 12 is used for wrapping a filling capsule 11, two ends of the filling capsule are drawn together and attached, and the filling capsule, the sliding sheet 10, the rain baffle 4 and the oil separating film 5 are locked and fixed together through a fixing bolt 9.
And finally, reducing the primary and secondary sealing structures, and finishing the installation.
When the air-filled capsule 13 is inflated, the air pressure inside the air-filled capsule 13 rises, and the air-filled capsule 13 expands. Finally, the outer surface of the inflatable capsule 13 is tightly attached to the outer edge plate of the floating roof, the primary sealing wrapping belt 3, the oil tank wall 14 plate, the filling capsule wrapping belt 12 and the like, and the filling capsule 11 and the filling capsule wrapping belt 12 are matched to fill the oil-gas space between the primary sealing and the secondary sealing. The filling outline of the filling capsule 11 and the filling outline of the inflatable capsule 13 are matched with the outline of the oil-gas space, so that the filling capsule is closed and occupies space. The inflation/deflation joint 15 inflates to keep the air pressure inside the inflatable bladder 13 stable and maintain the inflated shape and size of the inflatable bladder 13. In combination with the above description, a safe and stable oil-free airtight effect can be achieved.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (7)
1. An inflatable oil-free air sealing structure of an external floating roof oil tank comprises an annular primary sealing structure and an annular secondary sealing structure which are connected to a floating disc (1), wherein the primary sealing structure and the secondary sealing structure are positioned between a tank wall (14) and the floating disc (1), the secondary sealing mechanism comprises a rain baffle plate (4), and one end of the rain baffle plate (4) is connected to the floating disc (1); the rain shield is characterized in that the secondary sealing structure is connected with an inflatable capsule (13), an embedded connecting nut (7) is fixed in the inflatable capsule (13), and the embedded connecting nut (7) is connected with the rain shield (4) through an inflatable capsule fixing piece (6).
2. The external floating roof oil tank inflatable oil-free air sealing structure as claimed in claim 1, wherein the inflatable capsule fixing member (6) is a hollow structure, the inflatable capsule fixing member (6) is communicated with the inflatable capsule (13), and one end of the inflatable capsule fixing member (6) extending out of the secondary sealing mechanism is connected with an inflation/exhaust joint (15).
3. The external floating roof oil tank inflatable oil-free air sealing structure as claimed in claim 1, wherein a filling capsule assembly is arranged between the upper part of the inflatable capsule (13) and the secondary sealing structure, and the filling capsule assembly is connected to the secondary sealing structure.
4. The external floating roof oil tank inflatable oil-free air sealing structure according to claim 1, wherein a supporting limit plate (8) is clamped between the inflatable capsule (13) and the floating plate (1), the upper section of the supporting limit plate (8) is horizontally arranged, and the upper section of the supporting limit plate (8) is located between the inflatable capsule (13) and the filling capsule assembly.
5. The external floating roof oil tank inflatable oil-free airtight structure as claimed in claim 3, wherein the filling capsule assembly comprises a filling capsule wrapping belt (12), both ends of the filling capsule wrapping belt (12) are compressed between the rain baffle (4) and the sliding sheet (10), and a filling capsule (11) is arranged in the filling capsule wrapping belt (12).
6. The external floating roof oil tank inflatable oil-free air sealing structure as claimed in claim 5, wherein the material of the filler capsule (11) is flame retardant polyurethane; the packing belt (12) of the packing capsule is made of synthetic rubber.
7. The external floating roof oil tank inflatable oil-free airtight structure is characterized in that the material of the inflatable capsule (13) is reinforced rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111216809.4A CN113928740B (en) | 2021-10-19 | 2021-10-19 | Inflatable oil-free air sealing structure of external floating roof oil tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111216809.4A CN113928740B (en) | 2021-10-19 | 2021-10-19 | Inflatable oil-free air sealing structure of external floating roof oil tank |
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| CN113928740A true CN113928740A (en) | 2022-01-14 |
| CN113928740B CN113928740B (en) | 2023-03-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504105A (en) * | 2022-11-24 | 2022-12-23 | 江苏海裕新材料科技有限公司 | Full-liquid-connection internal floating disc and honeycomb plate installation method |
| CN116878591A (en) * | 2023-09-06 | 2023-10-13 | 深圳市科亿达科技有限公司 | Passive safety monitoring device and method for optical fiber of oil and gas storage tank |
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| JPH0872979A (en) * | 1994-08-30 | 1996-03-19 | Yokohama Rubber Co Ltd:The | Repair method of sealing part of liquid storage tank and bag used for the method |
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| CN108202934A (en) * | 2016-12-16 | 2018-06-26 | 中国石油化工股份有限公司 | The lidstock device of storage tank |
| CN111746950A (en) * | 2020-07-28 | 2020-10-09 | 安庆特种橡塑股份有限公司 | High-efficiency oil-free air sealing device for floating roof storage tank |
| CN111792211A (en) * | 2019-11-18 | 2020-10-20 | 中国石油天然气集团有限公司 | Floating roof sealing device, floating roof and floating roof tank |
| CN211767751U (en) * | 2020-01-13 | 2020-10-27 | 江苏科强新材料股份有限公司 | Floating roof tank oil-free air sealing structure |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5746782A (en) * | 1980-08-28 | 1982-03-17 | Chiyoda Chem Eng Construct Co | Sealing mechanism for floating roof of tank |
| JPH0872979A (en) * | 1994-08-30 | 1996-03-19 | Yokohama Rubber Co Ltd:The | Repair method of sealing part of liquid storage tank and bag used for the method |
| CN104139931A (en) * | 2014-08-09 | 2014-11-12 | 四川宏源德石化有限公司 | Flame-proof and explosion-proof safety device for primary and secondary sealing spaces of external floating-roof oil storage tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115504105A (en) * | 2022-11-24 | 2022-12-23 | 江苏海裕新材料科技有限公司 | Full-liquid-connection internal floating disc and honeycomb plate installation method |
| CN116878591A (en) * | 2023-09-06 | 2023-10-13 | 深圳市科亿达科技有限公司 | Passive safety monitoring device and method for optical fiber of oil and gas storage tank |
| CN116878591B (en) * | 2023-09-06 | 2023-11-24 | 深圳市科亿达科技有限公司 | Passive safety monitoring device and method for optical fiber of oil and gas storage tank |
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| Publication number | Publication date |
|---|---|
| CN113928740B (en) | 2023-03-24 |
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