CN107349539B - Flexible fireproof cover - Google Patents
Flexible fireproof cover Download PDFInfo
- Publication number
- CN107349539B CN107349539B CN201610932568.6A CN201610932568A CN107349539B CN 107349539 B CN107349539 B CN 107349539B CN 201610932568 A CN201610932568 A CN 201610932568A CN 107349539 B CN107349539 B CN 107349539B
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- Prior art keywords
- calcium
- flexible
- coated
- thickness
- silicate
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- 239000000835 fiber Substances 0.000 claims abstract description 40
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 39
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 38
- 239000011575 calcium Substances 0.000 claims abstract description 38
- 239000004744 fabric Substances 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 238000000576 coating method Methods 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000011229 interlayer Substances 0.000 claims abstract description 17
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 13
- 239000003063 flame retardant Substances 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 8
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 12
- 238000004880 explosion Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C2/00—Fire prevention or containment
- A62C2/06—Physical fire-barriers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Thermal Insulation (AREA)
Abstract
The invention relates to a flexible fireproof cover, which mainly solves the problem of poor safety in the prior art. The invention adopts a flexible fireproof cover, the joint of two adjacent sealing surfaces is sewn and connected by metal wires, meanwhile, a flame retardant adhesive coating is coated at the joint, the thickness of the coating is 2-4mm, metal buckles are arranged on the adjacent sealing surfaces, the arrangement distance of the adjacent buckles is 100-200mm, so that the two sealing surfaces are connected together, and each sealing surface is composed of a sandwich plate; each flexible sealing surface is composed of at least one interlayer, and the interlayer comprises upper calcium/silicate fibers, aluminum coated fabrics, lower calcium/silicate fibers, silicon dioxide fabrics, metal wires and high-temperature binders.
Description
Technical Field
The invention relates to a flexible fireproof cover.
Background
Important equipment or devices such as valve actuating mechanisms, electrical switches, stirrers and the like in the current petrochemical field are not provided with fire protection measures, and after a fire disaster occurs around, the equipment or devices are often in flame surrounding, and fail in a short time, so that the fire disaster is not controlled.
Currently, some equipment and facilities are coated with fire-retardant coating materials, such as fire-proof dikes, tall steel structures and the like, but the coating quality of the fire-retardant coating materials is often difficult to meet the use requirements, the problems of coating falling off, insufficient fire-retardant time and the like occur in use are prominent, and the fire-retardant coating materials are not suitable for equipment with movable parts, such as valves and the like.
Patent CN 202442067U discloses a fireproof cover for a wind generating set, which mainly achieves the purpose of fire prevention by coating a fireproof coating with certain viscosity on the surface of an engine subject and using fiber cloth in the fireproof coating. The range of application of the fireproof cover disclosed in the patent is greatly limited because the fireproof cover needs to be adhered to the surface of the machine body.
As seen from a plurality of accidents at home and abroad, after a fire disaster occurs, some valves lose control of the whole valve due to the failure of a protective layer of a power line, and the process operation cannot be started, so that the fire scene is out of control.
Disclosure of Invention
The invention aims to solve the technical problem of poor safety in the prior art and provides a novel flexible fireproof cover. The fireproof cover has the advantage of good safety.
In order to solve the problems, the invention adopts the following technical scheme: the flexible fireproof cover is characterized in that the joint of two adjacent sealing surfaces is sewn and connected by metal wires, a flame-retardant adhesive coating is coated at the joint, the thickness of the coating is 2-4mm, metal buckles are arranged on the adjacent sealing surfaces, the arrangement distance of the adjacent buckles is 100-200mm, so that the two sealing surfaces are connected together, and each sealing surface is composed of a sandwich plate; each flexible sealing surface is composed of at least one interlayer, the interlayer comprises upper calcium/silicate fibers, aluminum coated fabrics, lower calcium/silicate fibers, silicon dioxide fabrics, metal wires and a high-temperature binder, the lower calcium/silicate fibers are positioned at the lower part of the aluminum coated fabrics, the upper parts of the lower calcium/silicate fibers are upper calcium/silicate fibers, the upper parts of the upper calcium/silicate fibers are silicon dioxide fabrics, the metal wires in the interlayer provide a supporting frame for the calcium/silicate fiber layers, and the high-temperature binder is coated between the calcium/silicate fiber layers and is bonded together to form a complete interlayer.
In the above technical solution, preferably, the metal buckle is made of stainless steel.
In the above technical solution, preferably, the interlayer comprises calcium/silicate fibers (thickness 3-5 mm), multi-layer aluminum coated fabrics (thickness 2-3 mm), calcium/silicate fibers (thickness 300-500 mm), silica fabrics (thickness 5-8 mm), metal wires and high temperature binder.
In the above technical scheme, preferably, the metal wire is an iron wire or a stainless steel wire, and the diameter of the metal wire is 2-3mm.
In the above technical solution, preferably, the silica fabric layer needs to be resistant to burning, maintain integrity and stability under the action of flame sustaining, and the lower calcium/silicate fiber and the aluminum-coated fabric function to ensure rigidity of the fireproof cover, so that sufficient action space exists between the fireproof cover and the protection object, and the aluminum-coated fabric and the upper calcium/silicate fiber function to prevent heat from being introduced into the interior from the outside and cut off the heat transfer path.
In the above technical solution, preferably, the fire protection cover should not burn or deform at 1093 ℃ of hydrocarbon fire and 1300 ℃ of jet fire and withstand explosion impact of 2.9bar within a predetermined time, and the temperature in the tank body should not exceed 50 ℃.
This patent provides a novel key part thermal-insulated resistant protection measure, according to the appearance and the function of protected object, the custom-made physical isolation layer of putting the whole object into play and keep apart flame and thermal effect completely in the settlement time after the conflagration takes place around it with the normal operation and the detection maintenance that do not influence this equipment, for the normal start-up of protected object provides sufficient buffering time. According to the performance requirements of the protected objects, the burn-resistant and heat insulation time can be customized, and the operation conditions of the equipment in a fire disaster state can be completely met. The fire extinguishing device can effectively protect key devices such as a valve actuating mechanism, an instrument, a stirrer, a cable and the like from normally working in a preset time when flame is surrounded, and provides enough operation time for realizing process fire extinguishment. This patent can make the protection object avoid the influence of external weather condition in daily operation, increase of service life, improve the reliability of equipment. The flexible fireproof cover can be used for protecting the protection object with irregular, long and narrow shape or in a narrow space, so that the fireproof dead angle is eliminated, and a better technical effect is achieved.
Drawings
Fig. 1 is a schematic structural view of a sandwich plate according to the invention.
In fig. 1, silicate fibers under 1; 2, coating aluminum fabric; 3 calcium/silicate fiber; 4 a silica fabric.
Fig. 2 is a schematic external view of the present invention.
In fig. 2, 1 a flexible fire shield protective layer; 2, fixing metal buckles on the adjacent surfaces of the fireproof cover; 3, a movable protective surface of the fireproof cover; 4, a valve actuating mechanism in the flexible fireproof cover; and 5, an action rod of the valve actuating mechanism.
The present invention is further illustrated by, but not limited to, the following examples.
Detailed Description
[ example 1 ]
The fire protection cover is a closed flexible structure, and the shape of the fire protection cover is determined according to the shape of a protected object.
The cover body consists of a plurality of flexible sealing surfaces, the joint of two adjacent sealing surfaces is sewn and connected by metal wires, a flame retardant adhesive coating is coated at the joint, the thickness of the coating is 2mm, a plurality of metal buckles are arranged on the two adjacent sealing surfaces, the arrangement distance of the adjacent buckles is 100mm, the two sealing surfaces are connected together, and the metal buckles are made of stainless steel.
Each flexible sealing surface of the fire shield consists of a plurality of interlayers, the main structure of which comprises upper calcium/silicate fibers (thickness 3 mm), aluminum coated fabrics (thickness 2 mm), lower calcium/silicate fibers (thickness 300 mm), silicon dioxide fabrics (thickness 5 mm), metal wires and high temperature binders. The function of the wires is to provide a support frame for the calcium/silicate fiber layers, and the high temperature adhesive is applied between the calcium/silicate fiber layers to bond together, forming a complete sandwich.
The silica fabric layer needs to be resistant to burning, keeps integrity and stability under the action of flame sustaining, and the lower calcium/silicate fiber and the aluminum-coated fabric function to ensure the rigidity of the fireproof cover, so that sufficient action space exists between the fireproof cover and the protection object, and the aluminum-coated fabric and the upper calcium/silicate fiber function to prevent heat from being introduced into the inner part from the outside and cut off a heat transfer path.
The flexible structure can be completely attached according to the appearance of the protected object, and the flexible fireproof cover and the protected object can be completely attached by adopting the curved surface and the arc surface.
The fire protection cover should not burn, deform and withstand explosion impact of 2.9bar at 1093 ℃ of hydrocarbon fire and 1300 ℃ of jet fire for a preset time, and the temperature inside the box body is not more than 50 ℃. The thickness and size of the case are determined according to the performance of the protection object.
At 5000m 3 The use of the flexible fire shield is illustrated by taking a tank bottom pipeline valve of the storage tank as an example. The flexible fireproof cover is required to be arranged on the outer side of the valve actuating mechanism, and the actuating mechanism is completely wrapped on the inner side of the flexible fireproof cover. The whole overall dimension of the valve is 800mm multiplied by 600mm, therefore, the designed flexible fireproof cover has the length of 900mm and the width of 700mm, a cylindrical fireproof cover is formed, openings are formed at two ends of the fireproof cover, metal devices such as fasteners and rivets are used for fastening, a sealing cavity is formed, and the joints are connected by special sealing sheets and expand at high temperature to strengthen sealing.
Because the opening time of the valve actuating mechanism is 10min, after the fire disaster happens around the valve, the valve is surrounded by flame of oil or flammable gas, the highest temperature of the flame is about 1093 ℃, if the fire disaster happens around the valve, the flame temperature is up to 1300 ℃, the explosion can occur around the valve in the case of fire disaster, and the maximum design explosion impact is 3bar, so the design protection time of the rigid fireproof cover is 40min, and enough time is reserved for emergency disposal of firefighters. Based on the protection time and fire conditions, the interlayer is made of calcium/silicate fiber and glass fiber materials, and based on the burn-resistant test experimental data, the thickness of the interlayer is not less than 100mm.
Based on the protection time, the interlayer is made of calcium/silicate fiber and glass fiber, and based on the burn-resistant test experimental data, the thickness of the interlayer is not less than 100mm.
Because the flexible fireproof cover is connected by the fasteners, any fastener can be conveniently opened during daily inspection and maintenance, the internal devices are inspected, and the flexible fireproof cover can be conveniently closed after the inspection is finished, so that the tightness of the fireproof cover is maintained. An annular channel is arranged at the joint of the bottom of the box body and the pipeline, so that the pipeline where the valve is located can pass through the box body.
[ example 2 ]
According to the conditions and steps of embodiment 1, the cover body is composed of a plurality of flexible sealing surfaces, the joint of two adjacent sealing surfaces is sewn and connected by metal wires, meanwhile, a flame retardant adhesive coating is coated at the joint, the thickness of the coating is 4mm, a plurality of metal buckles are arranged on the two adjacent sealing surfaces, the arrangement distance of the adjacent buckles is 200mm, the two sealing surfaces are connected together, and the metal buckles are made of stainless steel.
Each flexible sealing surface of the fire shield consists of a plurality of interlayers, the main structure of which comprises upper calcium/silicate fibers (5 mm in thickness), aluminum coated fabrics (3 mm in thickness), lower calcium/silicate fibers (500 mm in thickness), silicon dioxide fabrics (8 mm in thickness) and metal wires and high temperature binders. The function of the wires is to provide a support frame for the calcium/silicate fiber layers, and the high temperature adhesive is applied between the calcium/silicate fiber layers to bond together, forming a complete sandwich.
The flexible fireproof cover is large in size, the wall surface is relatively soft and flexible, enough movable space is reserved between the flexible fireproof cover and the valve actuating mechanism, the box body provides a low-temperature environment for the actuating mechanism under the flame condition, the environment condition of normal operation of the valve actuating mechanism is met, the operation condition is provided for realizing emergency starting of the valve under the flame surrounding condition, the adverse condition that the valve is manually started after the actuating mechanism is burnt is avoided, and powerful guarantee is provided for fire-fighting and rescue.
The fire extinguishing device can effectively protect key devices such as a valve actuating mechanism, an instrument, a stirrer, a cable and the like from normally working in a preset time when flame is surrounded, and provides enough operation time for realizing process fire extinguishment. This patent can make the protection object avoid the influence of external weather condition in daily operation, increase of service life, improve the reliability of equipment. The flexible fireproof cover can be used for protecting the protection object with irregular, long and narrow shape or in a narrow space, so that the fireproof dead angle is eliminated, and a better technical effect is achieved.
Claims (3)
1. A flexible fireproof cover comprises at least two flexible sealing surfaces, wherein the joints of the two adjacent sealing surfaces are sewn and connected by metal wires, a flame retardant adhesive coating is coated at the joint, the thickness of the coating is 2-4mm, metal buckles are arranged on the adjacent sealing surfaces, the arrangement distance of the adjacent buckles is 100-200mm, so that the two sealing surfaces are connected together, and each sealing surface is composed of a sandwich plate; each flexible sealing surface is composed of at least one interlayer, the interlayer comprises upper calcium/silicate fibers, aluminum coated fabrics, lower calcium/silicate fibers, silicon dioxide fabrics, metal wires and a high-temperature binder, the lower calcium/silicate fibers are positioned at the lower part of the aluminum coated fabrics, the upper part of the aluminum coated fabrics is upper calcium/silicate fibers, the upper part of the upper calcium/silicate fibers is silicon dioxide fabrics, the metal wires in the interlayer provide a supporting frame for the calcium/silicate fiber layers, the high-temperature binder is coated between the calcium/silicate fiber layers and is bonded together to form a complete interlayer,
wherein the thickness of the upper calcium/silicate fiber is 3-5mm, the thickness of the aluminum-coated fabric is 2-3mm, the thickness of the lower calcium/silicate fiber is 300-500mm, the thickness of the silicon dioxide fabric is 5-8mm,
the silica fabric layer can maintain integrity and stability under the action of flame sustaining, the lower calcium/silicate fiber and the aluminum-coated fabric are used for ensuring the rigidity of the fireproof cover, so that a sufficient action space exists between the fireproof cover and a protection object, and the aluminum-coated fabric and the upper calcium/silicate fiber are used for preventing heat from being introduced into the inner part from the outside and cutting off a heat transfer path.
2. The flexible fire shield of claim 1 wherein the metal clip is stainless steel.
3. A flexible fire shield according to claim 1, wherein the wire is a wire or stainless steel wire having a diameter of 2-3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610932568.6A CN107349539B (en) | 2016-10-31 | 2016-10-31 | Flexible fireproof cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610932568.6A CN107349539B (en) | 2016-10-31 | 2016-10-31 | Flexible fireproof cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107349539A CN107349539A (en) | 2017-11-17 |
| CN107349539B true CN107349539B (en) | 2023-06-30 |
Family
ID=60270734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610932568.6A Active CN107349539B (en) | 2016-10-31 | 2016-10-31 | Flexible fireproof cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107349539B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115519838A (en) * | 2021-06-24 | 2022-12-27 | 中国石油化工股份有限公司 | Explosion fragment protection structure and preparation method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4413683A (en) * | 1980-10-20 | 1983-11-08 | Thermal Designs, Inc. | Fireproof enclosure for valve actuator |
| US5748072A (en) * | 1996-02-07 | 1998-05-05 | Wang; Hui | Apparatus for fire protection |
| CN1280021A (en) * | 2000-04-28 | 2001-01-17 | 刘学锋 | Full refractory fibre composite fire-proof heat insulation rolling curtain |
| CA2591287A1 (en) * | 2006-06-12 | 2007-12-12 | Freudenberg Nonwovens, L.P. | Fire blocking removable cover |
| CN201098486Y (en) * | 2007-02-09 | 2008-08-13 | 刘波 | Fast fire-extinguishing fire-proof cover |
| CA2826805A1 (en) * | 2012-09-14 | 2014-03-14 | Brandon Aloys Kunk | Fireproof system using jacketed fibrous endothermic mats |
| CN105987114A (en) * | 2015-03-17 | 2016-10-05 | 东洋橡胶工业株式会社 | Axle spring with fireproof cover |
| CN206391395U (en) * | 2016-10-31 | 2017-08-11 | 中国石油化工股份有限公司 | Flameproof enclosure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090190865A1 (en) * | 2008-01-29 | 2009-07-30 | Hilme Co., Ltd | Flame resistant bag |
| US8222165B2 (en) * | 2008-10-27 | 2012-07-17 | Pratt & Whitney Canada Corp. | Composite fire shield |
-
2016
- 2016-10-31 CN CN201610932568.6A patent/CN107349539B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4413683A (en) * | 1980-10-20 | 1983-11-08 | Thermal Designs, Inc. | Fireproof enclosure for valve actuator |
| US5748072A (en) * | 1996-02-07 | 1998-05-05 | Wang; Hui | Apparatus for fire protection |
| CN1280021A (en) * | 2000-04-28 | 2001-01-17 | 刘学锋 | Full refractory fibre composite fire-proof heat insulation rolling curtain |
| CA2591287A1 (en) * | 2006-06-12 | 2007-12-12 | Freudenberg Nonwovens, L.P. | Fire blocking removable cover |
| CN201098486Y (en) * | 2007-02-09 | 2008-08-13 | 刘波 | Fast fire-extinguishing fire-proof cover |
| CA2826805A1 (en) * | 2012-09-14 | 2014-03-14 | Brandon Aloys Kunk | Fireproof system using jacketed fibrous endothermic mats |
| CN105987114A (en) * | 2015-03-17 | 2016-10-05 | 东洋橡胶工业株式会社 | Axle spring with fireproof cover |
| CN206391395U (en) * | 2016-10-31 | 2017-08-11 | 中国石油化工股份有限公司 | Flameproof enclosure |
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| Publication number | Publication date |
|---|---|
| CN107349539A (en) | 2017-11-17 |
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Effective date of registration: 20240307 Address after: No. 22, Chaoyangmen street, Chaoyang District, Beijing 100020 Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Country or region after: China Patentee after: Sinopec Safety Engineering Research Institute Co.,Ltd. Patentee after: WENZHOU ANGONG MACHINERY SCIENCE AND TECHNOLOGY CO.,LTD. Address before: Yanan City, Shandong province Qingdao City three road 266071 No. 218 Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Country or region before: China Patentee before: SINOPEC Research Institute OF SAFETY ENGINEERING Patentee before: WENZHOU ANGONG MACHINERY SCIENCE AND TECHNOLOGY CO.,LTD. |