A lightweight blast wall structure for a hydrogen-containing compartment of an offshore platform
Patent Information
- Application Number
- CN202610909357.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-23
- Publication Date
- 2026-08-28
AI Technical Summary
在这些海上平台上，制氢设备间、氢氨转化间等含氢气舱室可能发生氢气泄漏，易导致舱室发生氢气爆炸
[0012]1. Compared to the 5-6 mm thick bulkhead panels commonly used in ordinary non-explosion-venting structures, explosion-venting structures use profiled steel sheets with an outer layer of 1.5-2.5 mm and an inner layer of 0.7-1.5 mm. Because the profiled steel sheets are thinner, they can completely disintegrate under pressures greater than 50 kPa. Hydrogen explosion pressures are generally in the hundreds to thousands of kPa range. In the event of an internal hydrogen explosion, the inner and outer profiled steel sheets will disintegrate instantly, thus relieving the internal explosion pressure. Furthermore, the thin profiled steel sheets disintegrate into small but large-area, soft-sheet-like projectiles. These projectiles have high wind resistance, short projection distance, and minimal damage to adjacent facilities. 2. Due to the small size and thinness of the profiled steel sheets, they cannot withstand high wind pressure. Therefore, their main load-bearing structure uses steel keels and side frames. To facilitate drainage, the profiled steel sheets are arranged vertically, while the horizontal keels are closely spaced, with intervals not exceeding 1.5 m. Wind pressure is transmitted from the profiled steel sheet to the horizontal keel, then from the horizontal keel to the vertical keel and side frame, and finally from the side frame to the platform's outer bulkhead. In the event of an explosion, the profiled steel sheet disintegrates, but the keel and side frame do not. With this structural arrangement, the vertically arranged profiled steel sheet has a relatively small span (not exceeding 1.5 m), ensuring that under a maximum wind pressure of 5 kPa, both the profiled steel sheet and the keel structure operate within the material's elastic range without structural damage. Because the profiled steel sheet is thin, welding cannot be used to connect it to the keel, and traditional anchor connections have insufficient strength, easily leading to wind-induced vibration failure. Therefore, this invention uses self-tapping screws to fix the inner and outer profiled steel sheets to the keel. These self-tapping screws can effectively penetrate 4-6 mm of keel thickness, forming a reliable connection with the keel. Furthermore, because the profiled steel sheet is thin, traditional stud welding would result in the profiled steel sheet being welded through. Therefore, the rivets are welded to the keel, which is 4-6 mm thick, and can be directly welded to the rivets. A folded pressure plate is then installed outside the rivets, fixing the wire mesh, which in turn fixes the fireproof cotton. This method is simple to install and reliably fixes the fireproof cotton between the inner and outer profiled steel plates, achieving fireproofing. 4. Both the inner and outer profiled steel plates are placed vertically with their water channels facing downwards, ensuring smooth water flow. An overlapping method is used at the connection between the left and right profiled steel plates, with the overlap including at least one fold, to prevent leakage at the overlap. Polyurethane sealant is applied around the perimeter of the outer profiled steel plate and between it and the side frame to seal the gaps between the profiled steel plate and the keel, providing both waterproofing and airproofing. Waterproof eaves are installed above the lightweight explosion-proof bulkhead structure and on the outer bulkhead of the platform, directing rainwater from the outer bulkhead to both sides, preventing it from flowing directly through the explosion-proof bulkhead and reducing the possibility of leakage. Drainage holes are made on the horizontal keels except for the top and bottom layers, and a drainage pipe is installed on the bottom horizontal keel to drain water that accidentally enters between the inner and outer profiled steel plates and prevent water from accumulating inside the cabin.A rubber gasket is installed at the connection between the platform's outer bulkhead and the lightweight explosion-proof bulkhead structure to prevent water leakage between them, thus preventing both water and air leakage; 5. Marine heavy-duty anti-corrosion coatings have been extensively used in marine engineering, and their anti-corrosion effect is significant, far superior to ordinary anti-corrosion coatings, galvanizing, zinc-aluminum-magnesium galvanizing, and even significantly superior to high-grade stainless steel materials. However, the lightweight explosion-proof bulkhead structure is relatively thin and overly complex, making it difficult to implement traditional marine heavy-duty anti-corrosion coating techniques such as sandblasting and spraying. Therefore, this invention uses powder materials and thermal spraying technology to thermally spray the inner and outer profiled steel plates, horizontal and vertical keels, and side frames before installation, achieving reliable corrosion protection for the structure. 6. It adopts a detachable structure, with the lightweight explosion-proof bulkhead structure being an independent component that can be independently processed and manufactured in a factory. After processing and manufacturing, it is hoisted as a whole into the reserved opening in the platform's outer bulkhead. The platform's outer bulkhead and the lightweight explosion-proof bulkhead structure are connected by bolts, simplifying installation and avoiding interference with platform manufacturing. If replacement is required during operation, it can also be processed and manufactured on land, and then hoisted as a whole into the reserved opening in the platform's outer bulkhead for installation, making replacement convenient.
Smart Images
Figure CN122646261A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of marine engineering technology, specifically relating to a lightweight explosion-proof bulkhead structure for hydrogen-containing compartments on offshore platforms. Background Technology
[0002] With the development of the offshore wind power industry, new types of offshore platforms such as offshore hydrogen production platforms and offshore energy island platforms are attracting increasing attention from the industry. On these offshore platforms, hydrogen-containing compartments such as hydrogen production equipment rooms and hydrogen-ammonia conversion rooms may experience hydrogen leaks, which could easily lead to hydrogen explosions. Most existing offshore platform design technologies do not consider hydrogen explosion scenarios; therefore, the bulkheads of existing offshore platforms are mostly made of single-layer profiled steel sheets, which cannot meet the explosion venting requirements of hydrogen-containing compartments.
[0003] The existing bulkhead structure technology for offshore platforms has the following technical problems: 1. Rapid disintegration and depressurization of hydrogen-containing compartments: The main function of explosion-proof bulkheads is to rapidly disintegrate themselves in the event of a hydrogen explosion, quickly releasing the explosion pressure inside the compartment to reduce the damage to the main structure and adjacent compartments; in addition, after disintegration, they should not produce large projectiles to reduce damage to nearby facilities; 2. Typhoon resistance of bulkhead structures: Explosion-proof bulkheads need to disintegrate rapidly in the event of a hydrogen explosion, therefore their structural strength is relatively weak. However, during normal operation, they must withstand typhoon wind pressure, and the structural integrity cannot be compromised by typhoon loads. Rapid disintegration during an explosion and wind resistance are contradictory; 3. Fire resistance of bulkheads: Explosion-proof bulkheads also need to meet fire resistance requirements, generally requiring a 1-hour fire resistance rating. Existing methods for fixing fireproof materials on offshore platforms generally use stud welding, but because the profiled steel sheets are thin, welding is not possible. Therefore, the application of fireproof materials is also a problem that needs to be addressed. 4. Waterproofing and sealing of the bulkhead: On the one hand, hydrogen-containing compartments mainly contain hydrogen production equipment and electrical equipment. Leaks in the bulkhead could seriously affect the operation of these equipment. Simultaneously, to maintain clean air inside the compartment, air circulation with the outside environment must be minimized. Therefore, waterproofing and sealing of the explosion-proof bulkhead is crucial. On the other hand, because the inside and outside of the explosion-proof bulkhead are made of profiled steel sheets with folded cross-sections, the fit with the structural connection surface is poor, easily creating large channels for water and air leakage. 5. Corrosion prevention of the bulkhead: The marine environment contains a large amount of water mist and salt spray, which are highly corrosive. The explosion-proof bulkhead structure is relatively thin, making corrosion prevention a prominent issue. 6. Installation and replacement of the bulkhead: The explosion-proof bulkhead structure is complex, requiring detailed handling during manufacturing. To avoid interference with platform structure construction, the explosion-proof bulkhead should be designed to be manufactured separately and installed onto the platform bulkhead after completion. Furthermore, after the compartment is vented, the explosion-proof bulkhead is disintegrated and cannot be reused; therefore, rapid replacement at sea must also be considered. Summary of the Invention
[0004] The purpose of this invention is to provide a lightweight explosion-proof bulkhead structure for hydrogen-containing compartments on offshore platforms, thereby at least partially overcoming the problems of the prior art as pointed out in the background section. To this end, this invention adopts the following technical solution:
[0005] A lightweight explosion-proof bulkhead structure for hydrogen-containing compartments on offshore platforms is characterized by comprising: an outer pressure-formed steel plate, an inner pressure-formed steel plate, horizontal joists, vertical joists, a side frame, and a fireproof layer; the inner and outer pressure-formed steel plates are thin-walled folded steel plates, both placed vertically, with the outer pressure-formed steel plate having a wall thickness of 1.5~2.5 mm and the inner pressure-formed steel plate having a wall thickness of 0.7~1.5 mm, and the outer pressure-formed steel plate having a greater wall thickness than the inner pressure-formed steel plate; the inner and outer pressure-formed steel plates are fixed to the horizontal and vertical joists using self-tapping screws with a tail drill; the horizontal and vertical joists are thick-walled C-shaped steel with a wall thickness of 4~6 mm, wherein the horizontal joists are closely spaced with a spacing not exceeding 1.5 m, and the side frame is thick-walled steel with a wall thickness of 10~20 mm. mm, the horizontal keel, vertical keel and side frame are connected by welding; the fireproof layer is set between the inner pressure steel plate and the outer pressure steel plate; the entire lightweight explosion relief bulkhead structure is an independent structure, which is processed and manufactured separately. After processing and manufacturing, it is hoisted into the reserved opening in the outer bulkhead of the platform and connected to the outer bulkhead of the platform by bolts.
[0006] The fireproof layer consists of fireproof cotton, wire mesh, studs, and folded pressure plates. The fireproof cotton is made of rock wool or ceramic wool, with a thickness of 40-60 mm. The fireproof cotton is laid tightly against the outer profiled steel plate and is slightly bent at the keel to cover the keel. Studs are welded to the outer side of the horizontal and vertical keels, with the stud tips pointing inward. Folded pressure plates are fixed inside the studs. The folded pressure plates are L-shaped and made of thin-walled flat steel. A layer of wire mesh is set outside the fireproof cotton, and the wire mesh is fixed to the fireproof cotton on the outer profiled steel plate by the folded pressure plates.
[0007] The connection between the two inner pressure steel plates and the connection between the two outer pressure steel plates adopt an overlapping joint method. The overlap range must include at least one fold, and there must be at least one self-tapping screw on each side of the overlapping section. The side frame is 20-30 mm larger than the outer pressure steel plate. Polyurethane sealant is applied between the outer pressure steel plate and the side frame to form a waterproof sealing ring around the outer pressure steel plate. A waterproof overhang is set on the upper part of the lightweight explosion-proof bulkhead structure and on the outer bulkhead of the platform. The waterproof overhang is a downward-sloping flat steel and is fixed to the outer bulkhead of the platform by welding to form the outer bulkhead pilot drainage facility.
[0008] The top horizontal keel is placed upside down, with the opening facing downwards, while the horizontal keels of the other layers are placed upright, with the openings facing upwards. Drainage holes are made on the horizontal keels except for the top and bottom layers. A drainage pipe is installed on the bottom horizontal keel and welded to the horizontal keel. The top horizontal keel does not have drainage holes or drainage pipes.
[0009] The internal and external profiled steel plates, horizontal and vertical keels, and side frames are all coated with marine heavy-duty anti-corrosion coating. The anti-corrosion coating is a powder material, with the inner coating being epoxy powder and the outer coating being polyurethane powder. The anti-corrosion coating is applied by thermal spraying, which is applied to the internal and external profiled steel plates, horizontal and vertical keels, and side frames before installation. The total thickness of the anti-corrosion coating film is 200~350 μm.
[0010] A bulkhead connecting frame is installed around the reserved opening. The size and style of the bulkhead connecting frame are the same as those of the side frame. The platform outer bulkhead and the lightweight explosion-proof bulkhead structure are connected by bolts. A rubber gasket is installed at the connection between the platform outer bulkhead and the lightweight explosion-proof bulkhead structure.
[0011] Compared with the prior art, the technical solution provided by the present invention has the following advantages:
[0012] 1. Compared to the 5-6 mm thick bulkhead panels commonly used in ordinary non-explosion-venting structures, explosion-venting structures use profiled steel sheets with an outer layer of 1.5-2.5 mm and an inner layer of 0.7-1.5 mm. Because the profiled steel sheets are thinner, they can completely disintegrate under pressures greater than 50 kPa. Hydrogen explosion pressures are generally in the hundreds to thousands of kPa range. In the event of an internal hydrogen explosion, the inner and outer profiled steel sheets will disintegrate instantly, thus relieving the internal explosion pressure. Furthermore, the thin profiled steel sheets disintegrate into small but large-area, soft-sheet-like projectiles. These projectiles have high wind resistance, short projection distance, and minimal damage to adjacent facilities. 2. Due to the small size and thinness of the profiled steel sheets, they cannot withstand high wind pressure. Therefore, their main load-bearing structure uses steel keels and side frames. To facilitate drainage, the profiled steel sheets are arranged vertically, while the horizontal keels are closely spaced, with intervals not exceeding 1.5 m. Wind pressure is transmitted from the profiled steel sheet to the horizontal keel, then from the horizontal keel to the vertical keel and side frame, and finally from the side frame to the platform's outer bulkhead. In the event of an explosion, the profiled steel sheet disintegrates, but the keel and side frame do not. With this structural arrangement, the vertically arranged profiled steel sheet has a relatively small span (not exceeding 1.5 m), ensuring that under a maximum wind pressure of 5 kPa, both the profiled steel sheet and the keel structure operate within the material's elastic range without structural damage. Because the profiled steel sheet is thin, welding cannot be used to connect it to the keel, and traditional anchor connections have insufficient strength, easily leading to wind-induced vibration failure. Therefore, this invention uses self-tapping screws to fix the inner and outer profiled steel sheets to the keel. These self-tapping screws can effectively penetrate 4-6 mm of keel thickness, forming a reliable connection with the keel. Furthermore, because the profiled steel sheet is thin, traditional stud welding would result in the profiled steel sheet being welded through. Therefore, the rivets are welded to the keel, which is 4-6 mm thick, and can be directly welded to the rivets. A folded pressure plate is then installed outside the rivets, fixing the wire mesh, which in turn fixes the fireproof cotton. This method is simple to install and reliably fixes the fireproof cotton between the inner and outer profiled steel plates, achieving fireproofing. 4. Both the inner and outer profiled steel plates are placed vertically with their water channels facing downwards, ensuring smooth water flow. An overlapping method is used at the connection between the left and right profiled steel plates, with the overlap including at least one fold, to prevent leakage at the overlap. Polyurethane sealant is applied around the perimeter of the outer profiled steel plate and between it and the side frame to seal the gaps between the profiled steel plate and the keel, providing both waterproofing and airproofing. Waterproof eaves are installed above the lightweight explosion-proof bulkhead structure and on the outer bulkhead of the platform, directing rainwater from the outer bulkhead to both sides, preventing it from flowing directly through the explosion-proof bulkhead and reducing the possibility of leakage. Drainage holes are made on the horizontal keels except for the top and bottom layers, and a drainage pipe is installed on the bottom horizontal keel to drain water that accidentally enters between the inner and outer profiled steel plates and prevent water from accumulating inside the cabin.A rubber gasket is installed at the connection between the platform's outer bulkhead and the lightweight explosion-proof bulkhead structure to prevent water leakage between them, thus preventing both water and air leakage; 5. Marine heavy-duty anti-corrosion coatings have been extensively used in marine engineering, and their anti-corrosion effect is significant, far superior to ordinary anti-corrosion coatings, galvanizing, zinc-aluminum-magnesium galvanizing, and even significantly superior to high-grade stainless steel materials. However, the lightweight explosion-proof bulkhead structure is relatively thin and overly complex, making it difficult to implement traditional marine heavy-duty anti-corrosion coating techniques such as sandblasting and spraying. Therefore, this invention uses powder materials and thermal spraying technology to thermally spray the inner and outer profiled steel plates, horizontal and vertical keels, and side frames before installation, achieving reliable corrosion protection for the structure. 6. It adopts a detachable structure, with the lightweight explosion-proof bulkhead structure being an independent component that can be independently processed and manufactured in a factory. After processing and manufacturing, it is hoisted as a whole into the reserved opening in the platform's outer bulkhead. The platform's outer bulkhead and the lightweight explosion-proof bulkhead structure are connected by bolts, simplifying installation and avoiding interference with platform manufacturing. If replacement is required during operation, it can also be processed and manufactured on land, and then hoisted as a whole into the reserved opening in the platform's outer bulkhead for installation, making replacement convenient. Attached Figure Description
[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope of the present invention. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 is an elevation view of the lightweight explosion-proof bulkhead structure provided by the present invention.
[0015] Figure 2 is a plan view of the lightweight explosion-proof bulkhead structure provided by the present invention.
[0016] Figure 3 is a detailed elevation view of the lightweight explosion-proof bulkhead provided by the present invention.
[0017] Figure 4 is a detailed plan view of the lightweight explosion-proof bulkhead provided by the present invention.
[0018] Figure 5 is a schematic diagram of the overlapping of profiled steel sheets provided by the present invention.
[0019] Explanation of reference numerals in the attached drawings: 1-Outer profiled steel sheet; 10-Folding of the outer profiled steel sheet; 2-Inner profiled steel sheet; 20-Folding of the inner profiled steel sheet; 3-Horizontal keel; 31-Drainage hole; 4-Vertical keel; 5-Side frame; 6-Fireproof layer; 7-Platform outer bulkhead; 11-Tail drill self-tapping screw; 12-Layer section of outer profiled steel sheet; 21-Layer section of inner profiled steel sheet; 51-Connecting bolt; 52-Rubber gasket; 61-Fireproof cotton; 62-Wire mesh; 63-Flanged stud; 64-Folded pressure plate; 71-Bulkhead connecting frame; 72-Waterproof eaves; 8-Waterproof sealing ring. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] As shown in Figures 1 and 2, this embodiment of the invention provides a lightweight explosion-proof bulkhead structure for hydrogen-containing compartments on offshore platforms, comprising: an outer profiled steel sheet 1, an inner profiled steel sheet 2, horizontal keels 3, vertical keels 4, side frames 5, and a fireproof layer 6. Figures 3 and 4 further describe in detail the detailed components of the explosion-proof bulkhead structure provided in this embodiment, including: self-tapping screws 11, connecting bolts 51, rubber gaskets 52, fireproof cotton 61, wire mesh 62, studs 63, and folded pressure plates 64.
[0022] In this embodiment of the invention, the outer profiled steel plate 1 and the inner profiled steel plate 2 are thin-walled folded steel plates, both placed vertically. The outer profiled steel plate 1 has a wall thickness of 1.5~2.5mm, and the inner profiled steel plate 2 has a wall thickness of 0.7~1.5mm. The inner profiled steel plate 1 and the outer profiled steel plate 2 are fixed to the horizontal keel 3 and the vertical keel 4 with self-tapping screws 11. The horizontal keel 3 and the vertical keel 4 are thick-walled C-shaped steel with a wall thickness of 4~6mm. The horizontal keels 3 are closely spaced with a spacing of no more than 1.5m. The side frame 5 is thick-walled steel with a wall thickness of 10~20mm. The horizontal keel 3, the vertical keel 4, and the side frame 5 are connected by welding. The fireproof layer is set between the inner profiled steel plate 1 and the outer profiled steel plate 2. The overall lightweight explosion-proof bulkhead structure is an independent structure, processed and manufactured separately. After processing and manufacturing, it is hoisted as a whole into the reserved opening in the outer bulkhead 7 of the platform and connected to the outer bulkhead 7 of the platform by bolts.
[0023] Specifically, in this embodiment of the invention, the fireproof layer consists of fireproof cotton 61, wire mesh 62, studs 63, and a folded pressure plate 64. The fireproof cotton 61 is made of rock wool or ceramic wool, with a thickness of 40-60mm. The fireproof cotton 61 is laid tightly against the outer profiled steel plate 1, and is slightly bent at the keel to cover it. Studs 63 are welded to the outer sides of the horizontal keel 3 and vertical keel 4, with the stud tips pointing inwards. A folded pressure plate 64 is fixed inside the studs 63; the folded pressure plate is L-shaped and formed by bending thin-walled flat steel. A layer of wire mesh 62 is placed outside the fireproof cotton 61, and the wire mesh 62 fixes the fireproof cotton 61 to the outer profiled steel plate 1 via the folded pressure plate 64.
[0024] The outer profiled steel sheet 1 and the inner profiled steel sheet 2 are uniformly pressed with multiple protruding folds 10 and 20, as shown in Figure 5. In this embodiment of the invention, the connection between the two outer profiled steel sheets and the connection between the two inner profiled steel sheets are made by overlapping. The overlap range must include at least one fold 10 or 20, and there must be at least one self-tapping screw 11 on each side of the overlapping section 12 or 21.
[0025] Specifically, in this embodiment of the invention, the side frame 5 is 20-30mm larger than the outer profiled steel plate 1. Polyurethane sealant is applied between the outer profiled steel plate 1 and the side frame 5 to form a waterproof sealing ring 8 around the outer profiled steel plate 1. A waterproof eaves 72 is provided above the lightweight explosion-proof bulkhead structure and on the outer bulkhead 7 of the platform. The waterproof eaves 72 is a downwardly inclined flat steel and is fixed to the outer bulkhead of the platform by welding to form a pilot drainage facility for the outer bulkhead.
[0026] Preferably, in this embodiment of the invention, the C-shaped plate of the top horizontal keel 3 is placed upside down, i.e., the opening faces downwards, while the horizontal keels 3 of the other layers are placed upright, i.e., the openings face upwards; drainage holes 31 are provided on the horizontal keels 3 except for the top and bottom layers, and the drainage holes are small holes with a diameter of about 10 mm; a drainage pipe is provided on the bottom horizontal keel 3, and the drainage pipe is a steel pipe with a diameter of about 10 mm, which is welded to the keel; the top horizontal keel 3 does not have drainage holes or drainage pipes.
[0027] Preferably, the outer profiled steel plate 1, the inner profiled steel plate 2, the horizontal keel 3, the vertical keel 4, and the side frame 5 are all coated with marine heavy-duty anti-corrosion coating; the anti-corrosion coating is a powder material, with the inner coating being epoxy powder and the outer coating being polyurethane powder; the anti-corrosion coating is applied by thermal spraying, which is applied to the outer profiled steel plate 1, the inner profiled steel plate 2, the horizontal keel 3, the vertical keel 4, and the side frame 5 before installation, and the total thickness of the anti-corrosion coating film is 200~350 μm.
[0028] Specifically, in this embodiment of the invention, the platform outer bulkhead 7 has pre-reserved openings according to the dimensions of the lightweight explosion-proof bulkhead structure, and bulkhead connecting frames 71 are set around the openings. The size and style of the bulkhead connecting frames 71 are consistent with the side frames 5 of the explosion-proof bulkhead. The platform outer bulkhead 7 and the lightweight explosion-proof bulkhead structure are connected by bolts 51. A layer of rubber gaskets 52 is set at the connection between the platform outer bulkhead and the lightweight explosion-proof bulkhead structure.
[0029] Compared with existing technologies, the lightweight explosion-proof bulkhead structure for hydrogen-containing compartments on offshore platforms provided by this invention has the following advantages: 1. The profiled steel sheet of the explosion-proof structure is thin, and it can completely disintegrate under the pressure of a hydrogen explosion. After disintegration, it forms small but large-area soft-sheet projectiles with short projection distance and minimal damage to adjacent facilities; 2. The technology of using closely spaced steel keels for load-bearing and self-tapping screws for fixing the profiled steel sheet overcomes the disadvantage of thin profiled steel sheet and low load-bearing capacity, enabling the explosion-proof structure to withstand typhoon loads; 3. Fireproof cotton is fixed by using welded keel studs + folded pressure plates + wire mesh. The technology avoids the problem of directly welding rivets to thin profiled steel sheets; 4. The use of overlapping profiled steel sheets, fireproof sealing around the profiled steel sheets, waterproof eaves on the outer bulkhead, drainage holes on the horizontal keel, and rubber gaskets between the platform's outer bulkhead and the lightweight explosion-proof bulkhead structure effectively solves the waterproof sealing problem of the explosion-proof bulkhead structure; 5. The use of powder materials and thermal spraying technology solves the problem of marine corrosion prevention for thin profiled steel sheets; 6. The explosion-proof bulkhead adopts a detachable structure, which can be independently processed, installed, maintained, and replaced without interfering with platform manufacturing, making it convenient to use.
[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.
Claims
1. A lightweight explosion-proof bulkhead structure for hydrogen-containing compartments on offshore platforms, characterized in that: It consists of an outer profiled steel plate, an inner profiled steel plate, horizontal keels, vertical keels, a side frame, and a fireproof layer. The inner and outer profiled steel plates are thin-walled folded steel plates, both placed vertically. The outer profiled steel plate has a wall thickness of 1.5~2.5 mm, and the inner profiled steel plate has a wall thickness of 0.7~1.5 mm, with the outer profiled steel plate having a greater wall thickness than the inner profiled steel plate. The inner and outer profiled steel plates are fixed to the horizontal and vertical keels using self-tapping screws with a self-drilling drill. The horizontal and vertical keels are thick-walled C-shaped steel with a wall thickness of 4~6 mm. The horizontal keels are closely spaced, with a spacing not exceeding 1.5 m. The side frame is made of thick-walled steel with a wall thickness of 10~20 mm. mm, the horizontal keel, vertical keel and side frame are connected by welding; the fireproof layer is set between the inner pressure steel plate and the outer pressure steel plate; the entire lightweight explosion relief bulkhead structure is an independent structure, which is processed and manufactured separately. After processing and manufacturing, it is hoisted into the reserved opening in the outer bulkhead of the platform and connected to the outer bulkhead of the platform by bolts.
2. A lightweight explosion-proof bulkhead structure for a hydrogen-containing compartment on an offshore platform as described in claim 1, characterized in that: The fireproof layer consists of fireproof cotton, wire mesh, studs, and folded pressure plates. The fireproof cotton is made of rock wool or ceramic wool, with a thickness of 40-60 mm. The fireproof cotton is laid tightly against the outer profiled steel plate and is slightly bent at the keel to cover the keel. Studs are welded to the outer side of the horizontal and vertical keels, with the stud tips pointing inward. Folded pressure plates are fixed inside the studs. The folded pressure plates are L-shaped and made of thin-walled flat steel. A layer of wire mesh is set outside the fireproof cotton, and the wire mesh is fixed to the fireproof cotton on the outer profiled steel plate by the folded pressure plates.
3. A lightweight explosion-proof bulkhead structure for a hydrogen-containing compartment on an offshore platform as described in claim 1, characterized in that: The connection between the two inner pressure steel plates and the connection between the two outer pressure steel plates adopt an overlapping joint method. The overlap range must include at least one fold, and there must be at least one self-tapping screw on each side of the overlapping section. The side frame is 20-30 mm larger than the outer pressure steel plate. Polyurethane sealant is applied between the outer pressure steel plate and the side frame to form a waterproof sealing ring around the outer pressure steel plate. A waterproof overhang is set on the upper part of the lightweight explosion-proof bulkhead structure and on the outer bulkhead of the platform. The waterproof overhang is a downward-sloping flat steel and is fixed to the outer bulkhead of the platform by welding to form the outer bulkhead pilot drainage facility.
4. A lightweight explosion-venting bulkhead structure for a hydrogen-containing compartment on an offshore platform as described in claim 1, characterized in that: The top horizontal keel is placed upside down, with the opening facing downwards, while the horizontal keels of the other layers are placed upright, with the openings facing upwards. Drainage holes are made on the horizontal keels except for the top and bottom layers. A drainage pipe is installed on the bottom horizontal keel and welded to the horizontal keel. The top horizontal keel does not have drainage holes or drainage pipes.
5. A lightweight explosion-proof bulkhead structure for a hydrogen-containing compartment on an offshore platform as described in claim 1, characterized in that: The internal and external profiled steel plates, horizontal and vertical keels, and side frames are all coated with marine heavy-duty anti-corrosion coating. The anti-corrosion coating is a powder material, with the inner coating being epoxy powder and the outer coating being polyurethane powder. The anti-corrosion coating is applied by thermal spraying, which is applied to the internal and external profiled steel plates, horizontal and vertical keels, and side frames before installation. The total thickness of the anti-corrosion coating film is 200~350 μm.
6. A lightweight explosion-venting bulkhead structure for a hydrogen-containing compartment on an offshore platform as described in claim 1, characterized in that: A bulkhead connecting frame is installed around the reserved opening. The size and style of the bulkhead connecting frame are the same as those of the side frame. The platform outer bulkhead and the lightweight explosion-proof bulkhead structure are connected by bolts. A rubber gasket is installed at the connection between the platform outer bulkhead and the lightweight explosion-proof bulkhead structure.