CN111186646A - Device for eliminating oil-gas space inside edge seal of external floating roof storage tank - Google Patents
Device for eliminating oil-gas space inside edge seal of external floating roof storage tank Download PDFInfo
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- CN111186646A CN111186646A CN201811349941.0A CN201811349941A CN111186646A CN 111186646 A CN111186646 A CN 111186646A CN 201811349941 A CN201811349941 A CN 201811349941A CN 111186646 A CN111186646 A CN 111186646A
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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
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Abstract
The invention discloses an internal oil-gas space eliminating device for the edge seal of an external floating roof storage tank, which comprises a rubber bag arranged in an oil-gas space between a primary seal and a secondary seal; the rubber bag divides the oil-gas space into two independent spaces; a first space which is completely isolated from the outside is formed between the rubber bag and the secondary seal, the first space is a completely oil-gas-free space, and a second space is formed between the rubber bag, the rubber scraper, the tank wall and the primary seal. The first space occupies most of the whole oil-gas space, and the hidden danger that the outer floating roof storage tank is struck by lightning and is sealed and detonated can be eliminated.
Description
Technical Field
The invention belongs to the field of oil and gas storage and transportation, and relates to an oil and gas space eliminating device inside an outer floating roof storage tank edge seal.
Background
At present, the edge sealing of a floating plate of a floating roof storage tank in China adopts a combined form of primary sealing and secondary sealing.
Wherein the primary seal is installed inside the annular space between the floating disc and the tank wall, usually in direct contact with the oil. In order to further reduce the evaporation loss of oil products, a set of sealing device is added on the original primary seal, namely secondary seal.
This combination allows a large enclosed space between the primary and secondary seals as shown in figure 6.
Due to reasons such as primary seal failure caused by tank wall deformation, respiration in the operation process of the floating roof, volatilization of condensed oil on the tank wall and the like, oil gas can be accumulated in a closed space between the primary seal and the secondary seal after a long time, and an oil gas space is formed.
After the oil gas concentration in the oil gas space reaches the flash explosion point, when meeting thunderstorm weather, probably take place thunderbolt detonation accident, bring very big potential safety hazard for the safety in production of enterprise. It can thus be seen that there is a need for further improvements in the art.
Disclosure of Invention
The invention aims to provide an internal oil-gas space eliminating device for the edge seal of an external floating roof storage tank, and aims to eliminate the possibility of lightning stroke deflagration accidents by reducing the volume of a closed space between primary seal and secondary seal.
In order to achieve the purpose, the invention adopts the following technical scheme:
outer sealed inside oil gas space remove device in top storage tank edge that floats includes:
the rubber bag is arranged in the oil-gas space between the primary seal and the secondary seal;
the rubber bag divides the oil-gas space into two independent spaces;
wherein, a first space which is completely isolated from the outside is formed between the rubber bag and the secondary seal, and a second space is formed between the rubber bag, the rubber scraper, the tank wall and the primary seal.
Preferably, the first space occupies not less than 93% by volume of the total oil and gas space when the tank wall is not deformed.
Preferably, the upper end of the rubber sack and the rubber scraper on the secondary seal are fixed in the same position.
Preferably, the lower end of the rubber bag and the primary sealing and primary sealing pressing plate are fixed at the top end of the edge of the floating plate.
Preferably, the upper end of rubber bag is equipped with the spacing offset plate of the type of falling L, wherein:
the horizontal section of the limiting rubber plate is fixed with the rubber scraper through a rubber scraper fixing bolt;
the vertical section of the limiting rubber plate is tightly attached to the tank wall, and the upper end of the rubber bag is tightly pressed on the tank wall.
Preferably, a counterweight rubber sheet is arranged at the position close to the primary seal on one side of the rubber bag jointed with the tank wall.
Preferably, the weight rubber sheet is located on the inner side wall of the rubber bag, i.e. the side wall facing the secondary seal.
Preferably, the lower end of the rubber bag and the primary seal and primary seal pressing plate are fixed by seal fixing bolts.
The invention has the following advantages:
according to the invention, the rubber bag is arranged in the oil-gas space between the primary seal and the secondary seal, a first space which is completely isolated from the outside is formed between the rubber bag and the secondary seal, and the first space is a completely oil-gas-free space. Because the first space occupies most of the whole oil and gas space, the hidden danger of lightning stroke sealing deflagration of the outer floating roof storage tank is basically eliminated.
Drawings
FIG. 1 is a schematic structural diagram of an internal oil-gas space eliminating device for the edge sealing of an external floating roof storage tank according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a first state diagram of the present invention showing the elimination of the inner hydrocarbon space at the edge seal of the outer floating roof tank;
FIG. 4 is a second state of use of the internal vapor space elimination device for the edge seal of an external floating roof storage tank of the present invention;
FIG. 5 is a third state of use of the internal vapor space elimination device for the edge seal of an external floating roof storage tank of the present invention;
FIG. 6 is a schematic view of a combination structure of "primary seal + secondary seal" in the prior art;
wherein, 1-rubber bag; 2-a rubber scraper; 3-rubber scraper fixing bolt; 4-limiting rubber plates; 5, secondary sealing; 6-sealing the fixing bolt; 7-floating plate; 8-primary sealing; 9-tank wall; 10-primary sealing pressing plate; 11-counterweight rubber sheet.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1
The embodiment 1 of the invention discloses a device for eliminating an oil gas space inside an outer floating roof storage tank edge seal.
As shown in figure 1, the inner oil gas space eliminating device for the edge sealing of the outer floating roof storage tank comprises a rubber bag 1.
The rubber bag 1 is arranged in the oil-gas space between the primary seal 8 and the secondary seal 5.
Wherein, the primary seal 8 and the secondary seal 5 are both existing sealing devices. Wherein:
the upper end of the primary seal 8 is mounted on the top end of the edge of the floating plate 7 through a seal fixing bolt 6.
The upper end of the secondary seal 5 is connected with the rubber scraper 2 through a rubber scraper fixing bolt 3.
When the tank wall 9 is not deformed, the squeegee 2 is attached to the tank wall 9.
The rubber bag in this example 1 divides the oil and gas space into two separate spaces.
Wherein, a first space (not shown) completely isolated from the outside is formed between the rubber bag 1 and the secondary seal 5, and the first space (not shown) is a closed space, i.e. a space completely without oil gas.
A second space (not shown) is formed between the rubber bag 1, the squeegee 2, the tank wall 9, and the primary seal 8.
The volume of the first space is significantly larger than the volume of the second space in this embodiment 1. When the tank wall is hung up with oil or the primary seal 8 fails, this will result in an increase in the oil and gas concentration inside the second space, which however is of a smaller volume.
Through setting up above-mentioned rubber bag 1 and forming the first space that does not have oil gas completely, this first space has occupied the most position in oil gas space, therefore can eliminate the sealed detonation's of outer floating roof storage tank emergence thunderbolt hidden danger.
Preferably, the first space occupies not less than 93% by volume of the total oil and gas space when the tank wall is not deformed.
Example 2
This example 2 also describes an external floating roof tank edge seal internal vapor space elimination device, which is different from the above example 1 in technical characteristics, and the rest of the technical characteristics can be referred to the above example 1.
As shown in fig. 1, this embodiment 2 shows a specific mounting structure of the rubber bag, that is:
the upper end of the rubber bag 1 and the rubber scraper 2 on the secondary seal are fixed at the same position. The lower end of the rubber bag 1, the primary seal 5 and the primary seal pressing plate 10 are fixed at the top end of the edge of the floating plate 7 through the seal fixing bolt 6.
Through the design, the rubber bag 1 can be installed on the basis of the existing structure.
Example 3
This example 3 also describes an external floating roof tank edge seal internal vapor space elimination device, which can refer to the above example 2 except that the following technical features are different from those of the above example 2.
As shown in fig. 2, in order to keep the portion of the rubber bag 1 in contact with the tank wall 9 in a fitting state as much as possible and to reduce the second space as much as possible, the following measures are taken:
the upper end of the rubber bag 1 is provided with an inverted L-shaped limiting rubber plate 4.
The horizontal section of the limiting rubber plate 4 is fixed with the rubber scraper 2 through a rubber scraper fixing bolt 3.
The vertical section of the limiting rubber plate 4 is tightly attached to the tank wall 9, and the upper end of the rubber bag 1 is tightly pressed on the tank wall 9.
The design not only reduces the volume of the second space (oil-gas containing space) to the maximum extent, but also prevents the rubber bag 1 from turning upwards to the lower part of the rubber scraper 2 by the limiting rubber plate 4.
Example 4
This example 4 also describes an external floating roof tank edge seal internal vapor space elimination device, which can refer to the above example 2 except that the following technical features are different from those of the above example 2.
As shown in fig. 1, in order to keep the portion of the rubber bag 1 in contact with the tank wall 9 in a fitting state as much as possible and to reduce the second space as much as possible, the following measures may be taken:
a counterweight rubber sheet 11 is arranged at the position close to the primary sealing and on one side of the rubber bag 1 attached to the tank wall 9.
The purpose of the weight rubber sheet 11 is to increase the weight of the rubber bag 1 on the side close to the tank wall 9 so that it can be kept in a vertical state under any conditions. The oil-gas containing space is reduced to the maximum extent by keeping the vertical state, and in addition, the counterweight rubber sheet with certain weight can also prevent the rubber bag 1 from turning upwards when the floating plate 7 goes downwards due to oil sticking of the tank wall 9.
The weight rubber sheet 11 is located on the inner side wall of the rubber bag 1, namely the side wall of the rubber bag 1 facing the secondary seal 5.
Example 5
This example 5 also describes an external floating roof tank edge seal internal vapor space elimination device.
This embodiment 5 combines the two modes of embodiment 3 and embodiment 4 in order to keep the portion of the rubber bag 1 in contact with the tank wall 9 in a fit state as much as possible and to achieve the purpose of reducing the second space as much as possible.
Under the synergistic action of the counterweight rubber sheet 11 and the limiting rubber plate 4, the possibility that the rubber bag 1 turns upwards can be eliminated.
Example 6
This embodiment 6 describes an installation method for installing the above-mentioned device for eliminating the internal oil-gas space sealed at the edge of the external floating roof tank, and the specific technical solution is as follows:
the installation method of the device for eliminating the internal oil-gas space sealed at the edge of the outer floating roof storage tank comprises the following steps:
s1. the outer floating roof tank is first installed with the primary seal 8.
And s2, pressing the lower end of the rubber bag 1 and the primary seal 8 together, placing the primary seal pressing plate 10, and fixing the primary seal 8, the primary seal pressing plate 10 and the rubber bag 1 by using the seal fixing bolt 6.
s3. the upper end of the rubber bag 1 is pressed between the rubber scraper 2 and the limiting rubber plate 4 and fixed by the rubber scraper bolt 3, and the upper end of the rubber bag 1 is pressed on the tank wall by the limiting rubber plate 4 after installation.
Through the steps, the installation of the oil-gas space eliminating device inside the edge sealing of the outer floating roof storage tank is facilitated.
The operation of the internal oil-gas space eliminating device for the edge sealing of the external floating roof storage tank is as follows:
design specifications require that when the annular gap at the edge of the floating plate 7 varies by ± 100mm, the primary seal 8 should be able to maintain good fit with the tank wall 9 to meet the sealing requirements.
When the can wall 9 is not deformed, i.e. the annular gap is not changed, the primary seal 8 remains in close abutment with the can wall 9 (fig. 1). The oil-gas space inside the seal (100% when the rubber bag 1 was not used) was reduced by 93%.
When the annular gap is reduced by deformation of the tank wall 9, as shown in fig. 3, the primary seal is compressed, and the oil-gas space inside the seal (100% of the oil-gas space when the rubber bag 1 is not used) is reduced by 95%.
When the tank wall 9 is deformed and the annular gap increases, as shown in fig. 4, the primary seal 8 expands outward, and the oil-gas space inside the seal (100% of the oil-gas space when the rubber bag 1 is not used) decreases by 91%.
When the tank wall 9 is deformed and the annular gap is increased until the primary seal 8 is separated from the tank wall 9, as shown in fig. 5, the oil medium which is protected by the primary seal 8 is exposed out of the liquid level, and the oil-gas space in the seal is larger at the moment, but the volume of the oil-gas space can still be greatly reduced compared with that before the rubber bag 1 is used.
In addition, when the floating plate 7 goes upward, the top end of the rubber bag 1 is pulled by the secondary seal 5 and moves upward together with the floating plate 7. At this time, the frictional force between the rubber bag 1 and the tank wall 9 is in the opposite direction to the running direction of the float 7.
When the floating disc 7 goes down, the rubber bag 1 is under the action of friction force of the tank wall 9, particularly when the tank wall 9 is provided with viscous oil, the rubber bag 1 tends to turn upwards, and the counterweight rubber sheet 11 and the limiting rubber plate 4 can prevent the rubber bag 1 from turning upwards.
It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. Outer floating roof storage tank edge seal inside oil gas space remove device, its characterized in that includes:
the rubber bag is arranged in the oil-gas space between the primary seal and the secondary seal;
the rubber bag divides the oil-gas space into two independent spaces;
wherein, a first space which is completely isolated from the outside is formed between the rubber bag and the secondary seal, and a second space is formed between the rubber bag, the rubber scraper, the tank wall and the primary seal.
2. The external floating roof tank edge seal internal hydrocarbon space elimination device of claim 1,
when the tank wall is not deformed, the volume ratio of the first space to the total oil-gas space is not less than 93%.
3. The external floating roof tank edge seal internal hydrocarbon space elimination device of claim 1,
the upper end of the rubber bag and the rubber scraper on the secondary seal are fixed at the same position.
4. The external floating roof tank edge seal internal hydrocarbon space elimination device of claim 3,
the lower end of the rubber bag and the primary sealing and primary sealing pressing plate are fixed at the top end of the edge of the floating plate.
5. The outer floating roof tank rim seal interior hydrocarbon space elimination device of claim 4,
the upper end of rubber bag is equipped with the spacing offset plate of the type of falling L, wherein:
the horizontal section of the limiting rubber plate is fixed with the rubber scraper through a rubber scraper fixing bolt;
the vertical section of the limiting rubber plate is tightly attached to the tank wall, and the upper end of the rubber bag is tightly pressed on the tank wall.
6. The external floating roof tank edge seal internal hydrocarbon space elimination device of claim 1,
and a counterweight rubber sheet is arranged at one side of the rubber bag, which is attached to the tank wall, and close to the primary sealing position.
7. The external floating roof tank edge seal internal hydrocarbon space elimination device of claim 6,
the counterweight rubber sheet is positioned on the inner side wall of the rubber bag, and the inner side wall faces to the side wall of the secondary seal.
8. The external floating roof tank edge seal internal hydrocarbon space elimination device of claim 5,
the lower end of the rubber bag is fixed with the primary sealing and primary sealing pressing plate through the sealing fixing bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811349941.0A CN111186646A (en) | 2018-11-14 | 2018-11-14 | Device for eliminating oil-gas space inside edge seal of external floating roof storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811349941.0A CN111186646A (en) | 2018-11-14 | 2018-11-14 | Device for eliminating oil-gas space inside edge seal of external floating roof storage tank |
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| Publication Number | Publication Date |
|---|---|
| CN111186646A true CN111186646A (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811349941.0A Pending CN111186646A (en) | 2018-11-14 | 2018-11-14 | Device for eliminating oil-gas space inside edge seal of external floating roof storage tank |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4138032A (en) * | 1977-09-26 | 1979-02-06 | Chicago Bridge & Iron Company | Full secondary seal, wiper type, for a floating roof tank |
| CN104355004A (en) * | 2014-10-22 | 2015-02-18 | 中国石油化工股份有限公司 | Sealing device between floating disc and tank wall of external floating roof tank and mounting method of sealing device |
| CN104370002A (en) * | 2014-11-14 | 2015-02-25 | 中国石油天然气股份有限公司大连石化分公司 | Floating roof tank floating pan continuous one-piece airtight sealing structure without oil gas space |
| CN204250668U (en) * | 2014-11-14 | 2015-04-08 | 安徽美祥实业有限公司 | A kind of hermetically-sealed construction without oil-gas space of floating roof tank floating plate |
| 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 |
-
2018
- 2018-11-14 CN CN201811349941.0A patent/CN111186646A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4138032A (en) * | 1977-09-26 | 1979-02-06 | Chicago Bridge & Iron Company | Full secondary seal, wiper type, for a floating roof tank |
| CN104355004A (en) * | 2014-10-22 | 2015-02-18 | 中国石油化工股份有限公司 | Sealing device between floating disc and tank wall of external floating roof tank and mounting method of sealing device |
| CN104370002A (en) * | 2014-11-14 | 2015-02-25 | 中国石油天然气股份有限公司大连石化分公司 | Floating roof tank floating pan continuous one-piece airtight sealing structure without oil gas space |
| CN204250668U (en) * | 2014-11-14 | 2015-04-08 | 安徽美祥实业有限公司 | A kind of hermetically-sealed construction without oil-gas space of floating roof tank floating plate |
| 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 |
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Application publication date: 20200522 |
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| RJ01 | Rejection of invention patent application after publication |