Plate seam arrangement method for rudder blade outer plate of product oil and chemical transport ship
By reinforcing the internal structure of the rudder blade's outer plate and employing high-standard welding, the problem of unreasonable plate seam arrangement in the rudder blade's outer plate was solved, achieving high strength, corrosion resistance, and efficient steering performance for the rudder blade.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU YANGZI MITSUI SHIPBUILDING CO LTD
- Filing Date
- 2026-03-02
- Publication Date
- 2026-05-01
AI Technical Summary
In the existing technology, the arrangement of the seams on the outer plate of the rudder blade is not properly planned, which leads to difficulties in welding the sealing plate, positioning deviation, and uneven stress on the structure, affecting the construction quality and service life of the rudder blade.
The plate seams are arranged with internal reinforcing components such as vertical and horizontal bulkheads, using Grade A/B/D/E marine steel plates. The welds are subjected to 100% ultrasonic and magnetic particle testing, and full penetration butt welding is performed. The rudder blade is filled with vapor phase corrosion inhibitor to form a corrosion protection and stress optimization system.
It improves the fatigue resistance and reliability of the rudder blades, reduces the processing difficulty, ensures watertightness and structural integrity, extends service life, and improves steering response efficiency.
Smart Images
Figure CN121947712A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of shipbuilding technology, specifically to a method for arranging the seams of the outer plate of the rudder blade of a refined oil and chemical transport ship. Background Technology
[0002] 50,000 DWT oil and chemical tankers are mainstream liquid cargo vessels in the shipping industry, primarily responsible for the maritime transfer of various media such as gasoline, diesel, and chemical solvents. Their hull structures must simultaneously meet requirements for corrosion resistance, watertightness, and structural strength, directly impacting the safety of liquid cargo transportation and the reliability of ship operation. The rudder blade, as a core steering component, adopts a hollow airfoil structure, composed of components such as the rudder plate, horizontal bulkheads, and vertical bulkheads. It connects to the hull via the rudder stock and rudder pin. The smoothness of its surface lines, the rationality of its structure, and the quality of its welds not only affect the ship's hydrodynamic performance and heading accuracy but also need to meet the impact and vibration resistance requirements of liquid cargo transport vessels. The arrangement of the rudder blade's outer plate seams is a key technological aspect determining the quality and efficiency of rudder blade construction. The rationality of the seam offset towards one side directly affects the ease of sealing process holes and the structural stability.
[0003] In existing technologies, the arrangement of the seams in the outer plate of the rudder blade prioritizes structural strength and linear smoothness, without specifically optimizing the sealing process of the process holes. Furthermore, the design of the seams is not reasonably biased towards one side, indicating significant technical shortcomings. Because the seams are not scientifically planned to be biased towards one side, the outer plate structure around the process holes is misaligned. This necessitates multiple rotations of the rudder blade to adjust the working angle during sealing plate welding. This not only increases the auxiliary workload for rudder blade positioning and fixing, extending the construction period, but also easily leads to positioning deviations due to repeated rudder rotations, affecting the accuracy of the sealing plate welds and leaving potential sealing hazards. Simultaneously, the repeated rudder rotations may collide and damage the already assembled components inside the rudder blade, increasing construction risks. Moreover, the unreasonable biased arrangement towards one side may lead to uneven stress on the rudder blade, potentially causing structural cracks and other problems with long-term use.
[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and proposed a method for arranging the plate seams of the outer plate of the rudder blade of a refined oil and chemical transport ship. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this invention provides a method for arranging the seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel, thus solving the problems mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for arranging the seams of the outer plate of a rudder blade for a refined oil and chemical transport vessel. The outer plate of the rudder blade in this method includes a vertical bulkhead, a horizontal bulkhead, and a rudder blade. An upper cast steel component is installed on the top of the rudder blade, and a lower cast steel component is located below the upper cast steel component. A top plate is welded to one side of the upper cast steel component, and a middle top plate is welded to one side of the lower cast steel component. Both the vertical and horizontal bulkheads are located inside the rudder blade. The horizontal bulkheads are equidistantly arranged along the height direction of the rudder blade, and the vertical bulkheads are arranged along the width direction of the rudder blade. An elbow plate is installed at the junction of the horizontal and vertical bulkheads. A pad is located in the weld transition area of the rudder blade, and a bottom plate is installed at the bottom of the pad. A reinforcing rudder plate is located in the middle of the rudder blade, and a top area rudder plate is located at the upper end of the reinforcing rudder plate. A bottom area rudder plate is installed at the lower end of the reinforcing rudder plate, and a rudder guide plate is installed on one side of the bottom area rudder plate.
[0007] Furthermore, the interior of the reinforced area rudder plate and the top area rudder plate is provided with a hanging pipe, and a detachable top plate is embedded in the reserved opening between the top plate and the top area rudder plate.
[0008] Furthermore, a tail plate is provided at the rear end of the rudder blade, and a tail area rudder plate is welded to one side of the tail plate.
[0009] Furthermore, the top plate, bottom plate, bottom area rudder plate, reinforced area rudder plate, top area rudder plate, stern area rudder plate, stern plate, and rudder guide plate are made of Grade A / B / D / E marine steel plates, and the plate seams are preferably arranged in the positions of the reinforcing members inside the horizontal bulkhead and vertical bulkhead.
[0010] Furthermore, the horizontal and vertical partitions are provided with weight-reducing holes, and the pad is used to adjust the welding bevel of steel plates of different thicknesses.
[0011] Furthermore, the welds of the top plate, bottom plate, tail plate, tail area rudder plate, bottom area rudder plate, rudder guide plate, reinforced area rudder plate, and top area rudder plate to the upper and lower cast steel parts are subjected to 100% ultrasonic and magnetic particle testing.
[0012] Furthermore, the edges of the top plate and bottom plate are rounded (R), and the detachable body, bottom detachable body and top detachable plate are fixedly connected to the corresponding reinforced area rudder plate and top area rudder plate by bolts.
[0013] Furthermore, the rudder blade is provided with drain plugs in the top and bottom areas inside to drain water accumulated in the rudder blade cavity.
[0014] Furthermore, the tail region rudder plate is located at the rear of the rudder blade, and the tail region rudder plate is welded to the tail plate, the lower bottom region rudder plate, and the upper top region rudder plate. This includes the following steps: 1) Lofting is carried out with the rudder centerline as the reference to determine the boundaries of the outer plate sections. The precise dimensions of the components are determined by the lofting. Unless otherwise specified, the port and starboard structures are symmetrical. 2) The outer plate assembly is composed of the top plate, bottom plate, tail plate, tail area rudder plate, bottom area rudder plate, rudder guide plate, reinforced area rudder plate and top area rudder plate according to the rudder blade outline. The plate gaps are preferably arranged in the internal middle top plate, vertical partition, horizontal partition, elbow plate and pad plate to avoid stress concentration areas. The direction of the plate gaps should be parallel to the water flow direction or intersect at a small angle. 3) The plate seams adopt full penetration butt welding. The welds connected to the castings are subjected to ultrasonic and magnetic particle testing. The butt welds of the outer plate components are subjected to 100% ultrasonic testing. 4) Special designs are made for plate joints in special locations such as plug weld holes, detachable maintenance areas, and pipe hanging areas to ensure water tightness and structural strength; 5) After the rudder blade is completed, a 0.02MPa air tightness test is conducted. After the test is passed, a vapor phase corrosion inhibitor is filled inside.
[0015] This invention provides a method for arranging the seams between the outer plate of the rudder blade of a refined oil and chemical transport vessel, which has the following beneficial effects: 1. The plate seam arrangement method of the outer plate of the rudder blade of the oil and chemical transport vessel prioritizes the arrangement of plate seams at the positions of internal reinforcing components such as vertical bulkheads, horizontal bulkheads, and elbow plates. This makes the outer plate components (such as top plate, bottom plate, and reinforced rudder plate) and the internal frame form an integrated stress system, effectively dispersing the water flow impact and torque load during steering. At the same time, 100% ultrasonic and magnetic particle testing is used on the key welds connecting to the upper and lower cast steel parts, which fundamentally ensures the weld quality and structural integrity, and significantly improves the fatigue resistance and reliability of the rudder blade under complex sea conditions.
[0016] 2. The plate joint arrangement method of the outer plate of the rudder blade of the oil and chemical transport vessel ensures the water tightness of the plate joint through full penetration butt welding and adjustment of the welding bevel by backing plates. After the rudder blade is completed, a 0.02MPa air tightness test is carried out to effectively eliminate the risk of leakage. At the same time, after the test is passed, vapor phase corrosion inhibitor is filled into the internal cavity of the rudder blade. Combined with the filling of the plug weld holes with epoxy putty and the grinding of the edges of the top plate and bottom plate into R3 rounded corners, a comprehensive anti-corrosion and stress optimization system is formed, which greatly extends the service life of the rudder blade and is especially suitable for the harsh marine environment of oil and chemical transport vessels.
[0017] 3. The method of arranging the plate seams of the outer plate of the rudder blade of the oil and chemical transport vessel is based on the centerline of the rudder blade for layout, which ensures the symmetry of the port and starboard sides and reduces the difficulty of processing and assembly. By setting detachable plates, detachable bodies and detachable bodies at the top and bottom respectively, a convenient maintenance passage is formed. With the drain plug set at the bottom, the internal structure can be quickly inspected, maintained and drained. In addition, the design of the plate seam direction being parallel to or intersecting the water flow direction at a small angle optimizes hydrodynamic performance and improves steering response efficiency while ensuring strength. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall external structure of a plate seam arrangement method for the outer plate of the rudder blade of a refined oil and chemical transport vessel according to the present invention. Figure 2 This is a schematic diagram of the internal structure of a plate seam arrangement method for the outer plate of the rudder blade of a refined oil and chemical transport vessel according to the present invention. Figure 3 This is a schematic diagram of the rudder blade structure according to the present invention, which describes a method for arranging the plate seams of the outer plate of a rudder blade for transporting refined oil and chemicals. Figure 4 This invention relates to a method for arranging the seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel. Figure 3 A-1, A-2, A-3, A-4, A-5, A-6, A-7, A-8, A-9, A-10, A-11 and A-12 cross-sectional structural diagram; Figure 5 This invention relates to a method for arranging the seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel. Figure 3 Schematic diagram of cross-sectional structures B-1, B-2, B-3, B-4, B-5 and B-6.
[0019] In the diagram: 1. Lower cast steel component; 2. Upper cast steel component; 3. Top plate; 4. Bottom plate; 5. Middle top plate; 6. Tail plate; 7. Tail area rudder plate; 8. Bottom area rudder plate; 9. Rudder guide plate; 10. Reinforced area rudder plate; 11. Detachable body; 12. Top area rudder plate; 13. Bottom detachable body; 14. Top detachable plate; 15. Vertical bulkhead; 16. Horizontal bulkhead; 17. Elbow plate; 18. Pad plate; 19. Hanging pipe; 20. Vent plug; 21. Rudder blade. Detailed Implementation
[0020] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.
[0021] like Figures 1-5As shown, the present invention provides a technical solution: a method for arranging the plate seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel. The outer plate of the rudder blade in this arrangement method includes a lower cast steel component 1, an upper cast steel component 2, a top plate 3, a bottom plate 4, an intermediate top plate 5, a stern plate 6, a stern region rudder plate 7, a bottom region rudder plate 8, a rudder guide plate 9, a reinforced region rudder plate 10, a detachable body 11, a top region rudder plate 12, a bottom detachable body 13, a top detachable plate 14, a vertical bulkhead 15, a horizontal bulkhead 16, an elbow plate 17, a pad plate 18, a lifting pipe 19, a drain plug 20, and a rudder blade 21. An upper cast steel component is installed on the top of the rudder blade 21. Part 2, and a lower cast steel part 1 is provided below the upper cast steel part 2. Drain plugs 20 are provided in the top and bottom areas of the rudder blade 21 to drain water accumulated in the cavity of the rudder blade 21. A tail plate 6 is provided at the rear end of the rudder blade 21, and a tail area rudder plate 7 is welded to one side of the tail plate 6. The tail area rudder plate 7 is located at the rear of the rudder blade 21, and the tail area rudder plate 7 is welded to the tail plate 6, the lower bottom area rudder plate 8, and the upper top area rudder plate 12. A top plate 3 is welded to one side of the upper cast steel part 2, and a middle top plate 5 is welded to one side of the lower cast steel part 1. Both the vertical partition 15 and the horizontal partition 16 are provided with The rudder blade 21 is placed inside, with horizontal bulkheads 16 equidistantly arranged along the height of the rudder blade 21 and vertical bulkheads 15 arranged along the width of the rudder blade. An elbow plate 17 is installed at the junction of the horizontal bulkheads 16 and the vertical bulkheads 15. A pad plate 18 is set in the weld transition area of the rudder blade 21, and a bottom plate 4 is installed at the bottom of the pad plate 18. The edges of the top plate 3 and the bottom plate 4 are rounded with R3. The detachable body 11, the bottom detachable body 13, and the top detachable plate 14 are fixedly connected to the corresponding reinforced area rudder plate 10 and the top area rudder plate 12 by bolts. The top plate 3, the bottom plate 4, the bottom area rudder plate 8, and the reinforced area rudder plate 10 are also mentioned. The top area rudder plate 12, the stern area rudder plate 7, the stern plate 6, and the rudder guide plate 9 are made of Grade A / B / D / E marine steel plates. The plate seams are preferentially arranged in the positions of the reinforcing members inside the horizontal bulkhead 16 and the vertical bulkhead 15. The welds of the top plate 3, bottom plate 4, stern plate 6, stern area rudder plate 7, bottom area rudder plate 8, rudder guide plate 9, reinforced area rudder plate 10, and top area rudder plate 12 to the upper cast steel part 1 and the lower cast steel part 2 are subjected to 100% ultrasonic and magnetic particle testing. The watertightness of the plate seams is ensured by full penetration butt welding and adjusting the welding bevel by backing plate 18. After the rudder blade 21 is completed, 0.The 0.02MPa airtightness test effectively eliminated the risk of leakage. After passing the test, a vapor-phase corrosion inhibitor was injected into the internal cavity of the rudder blade 21. Combined with epoxy putty filling of the weld holes and R3 rounded edges on the top plate 3 and bottom plate 4, a comprehensive anti-corrosion and stress optimization system was formed, significantly extending the service life of the rudder blade 21. It is particularly suitable for the harsh marine environment of oil and chemical transport vessels. A reinforced rudder plate 10 is provided in the middle of the rudder blade 21, and a [missing information - likely a design feature] is provided at the upper end of the reinforced rudder plate 10. The top area rudder plate 12 is laid out with the centerline of the rudder blade 21 as a reference, ensuring the symmetry of the port and starboard structures and reducing the difficulty of processing and assembly. By setting a top detachable plate 14, a detachable body 11, and a bottom detachable body 13 at the top and bottom respectively, a convenient maintenance passage is formed. Combined with the drain plug 20 at the bottom, it enables rapid inspection, maintenance, and drainage of the internal structure. A bottom area rudder plate 8 is installed at the lower end of the reinforced area rudder plate 10, and a rudder guide plate 9 is installed on one side of the bottom area rudder plate 8.
[0022] like Figure 1 and Figure 2 As shown, the reinforcing rudder plate 10 and the top area rudder plate 12 are equipped with hanging pipes 19. A top detachable plate 14 is embedded in the reserved opening between the top plate 3 and the top area rudder plate 12. Weight reduction holes are opened on the horizontal bulkhead 16 and the vertical bulkhead 15. The pad plate 18 is used to adjust the welding bevel of steel plates of different thicknesses. By prioritizing the arrangement of plate seams in the internal reinforcing components such as the vertical bulkhead 15, the horizontal bulkhead 16 and the elbow plate 17, the outer plate components such as the top plate 3, the bottom plate 4, and the reinforcing rudder plate 10 are integrated with the internal frame to form an integrated force system, which effectively disperses the water flow impact and torque load during steering. At the same time, the key welds connecting to the upper cast steel part 2 and the lower cast steel part 1 are subjected to 100% ultrasonic and magnetic particle testing, and the butt welds of the outer plates are subjected to 100% ultrasonic testing, which fundamentally ensures the weld quality and structural integrity, and significantly improves the fatigue resistance and reliability of the rudder blade 21 in complex sea conditions.
[0023] A method for arranging the seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel includes the following steps: 1) Lofting is carried out with the centerline of rudder blade 21 as the reference to determine the boundary of the outer plate blocks. The precise dimensions of the components are determined by the lofting. Unless otherwise specified, the port and starboard structures are symmetrical. 2) The outer plate assembly is composed of the top plate 3, bottom plate 4, tail plate 6, tail area rudder plate 7, bottom area rudder plate 8, rudder guide plate 9, reinforced area rudder plate 10, and top area rudder plate 12 according to the outline of rudder blade 21. The plate seams are preferably arranged in the middle of the inner top plate 5, vertical partition 15, horizontal partition 16, elbow plate 17 and pad plate 18 to avoid stress concentration areas. The direction of the plate seams should be parallel to the direction of water flow or intersect at a small angle. 3) The plate seams adopt full penetration butt welding. The welds connected to the castings are subjected to 100% ultrasonic and magnetic particle testing. The butt welds of the outer plate components are subjected to 100% ultrasonic testing. 4) Special designs are made for plate joints in special locations such as plug weld holes, detachable maintenance areas, and hanging pipe 19 areas to ensure water tightness and structural strength; 5) After the rudder blade 21 is completed, a 0.02MPa air tightness test is conducted. After the test is passed, a vapor phase corrosion inhibitor is filled inside.
[0024] In summary, as Figures 1-5 As shown, the method for arranging the seams of the outer plate of the rudder blade of the oil and chemical transport ship is as follows: In use, the rudder blade 21 has an upper cast steel component 2 at the top and a lower cast steel component 1 at the bottom, which are used to connect with the rudder stock and rudder pin respectively and transmit steering torque. A top plate 3 is welded to one side of the upper cast steel component 2, and a middle top plate 5 is welded to one side of the lower cast steel component 1, forming the upper load-bearing structure of the rudder blade 21. Horizontal bulkheads 16 are arranged equidistantly along the height direction and vertical bulkheads 15 are arranged along the width direction inside the rudder blade 21. An elbow plate 17 is set at the junction of the horizontal bulkheads 16 and the vertical bulkheads 15 to form a stable internal reinforcing skeleton, improving overall rigidity and dispersing stress. A backing plate 18 is set in the weld transition area to adjust the welding bevel of steel plates of different thicknesses and ensure full weld penetration. A bottom plate 4 is installed at the bottom of the backing plate 18, which, together with the top plate 3, forms the upper and lower closed boundaries of the rudder blade 21. The middle part of the rudder blade 21 is the reinforced rudder plate 10. The upper end is connected to the top area rudder plate 12, and the lower end is connected to the bottom area rudder plate 8. A rudder guide plate 9 is installed on one side of the bottom area rudder plate 8 to optimize the water flow direction and improve steering efficiency. The rear of the rudder blade 21 is provided with the tail area rudder plate 7, and the rearmost end is provided with the tail plate 6. The tail area rudder plate 7 is welded to the tail plate 6, the top area rudder plate 12, and the bottom area rudder plate 8 respectively to form a complete streamlined outer plate outline. The top plate 3, bottom plate 4, bottom area rudder plate 8, reinforced area rudder plate 10, top area rudder plate 12, tail area rudder plate 7, tail plate 6, and rudder guide plate 9 are all made of Grade A / B / D / E marine steel plates. The plate seams are preferentially arranged at the positions of the intermediate top plate 5, vertical bulkhead 15, horizontal bulkhead 16, elbow plate 17, and pad plate 18 and other reinforced components to avoid stress concentration areas. The direction of the plate seams is parallel to or intersects the water flow direction at a small angle to reduce water flow resistance and improve structural stability. The welds connecting the outer plate to the upper cast steel part 1 and the lower cast steel part 2 are subjected to 100% ultrasonic and magnetic particle testing. The butt welds between the outer plate components are subjected to 100% ultrasonic testing to ensure structural strength and safety. The edges of the top plate 3 and the bottom plate 4 are machined to R3 rounded corners to reduce stress concentration and improve hydrodynamic shape. The top detachable plate 14 is embedded between the top plate 3 and the top area rudder plate 12. It is fixed to the corresponding outer plate with bolts in conjunction with the detachable body 11 and the bottom detachable body 13 to form an openable maintenance structure. The reinforcing area rudder plate 10 and the top area rudder plate 12 are equipped with lifting pipes 19 and the top area rudder plate 12 are equipped with lifting pipes 21 for the hoisting operation of the rudder blade 21. The top and bottom areas inside the rudder blade 21 are equipped with drain plugs 20 for draining water accumulated in the cavity. During manufacturing, the centerline of rudder blade 21 is used as a reference for layout to determine the boundaries of the outer plate segments. The structure is symmetrically arranged on the port and starboard sides. The plate seams adopt full penetration butt welding. The plate seams in special locations such as plug weld holes, detachable areas, and the area of lifting pipe 19 are designed separately to ensure water tightness and structural strength. After the completion of rudder blade 21, a 0.02MPa air tightness test is carried out. After passing the test, vapor phase corrosion inhibitor is filled inside. Combined with measures such as filling plug weld holes and rounding corners, long-term corrosion protection is achieved, so that rudder blade 21 can maintain a stable and reliable working state in the high-intensity and high-corrosion operating environment of refined oil and chemical tankers.
[0025] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.
Claims
1. A method for arranging the seams between the outer plate of the rudder blade of a refined oil and chemical transport vessel, characterized in that: The rudder blade outer plate in this plate seam arrangement method includes a vertical bulkhead (15), a horizontal bulkhead (16), a pad plate (18), and a rudder blade (21). An upper cast steel component (2) is installed on the top of the rudder blade (21), and a lower cast steel component (1) is provided below the upper cast steel component (2). A top plate (3) is welded to one side of the upper cast steel component (2), and a middle top plate (5) is welded to one side of the lower cast steel component (1). The vertical bulkhead (15) and the horizontal bulkhead (16) are both located inside the rudder blade (21), and the horizontal bulkhead (16) are equidistantly arranged along the height direction of the rudder blade (21). The vertical partition (15) is arranged along the width direction of the rudder blade. An elbow plate (17) is installed at the junction of the horizontal partition (16) and the vertical partition (15). The pad plate (18) is set in the weld transition area of the rudder blade (21). A bottom plate (4) is installed at the bottom of the pad plate (18). A reinforcing rudder plate (10) is set in the middle of the rudder blade (21). A top area rudder plate (12) is set at the upper end of the reinforcing rudder plate (10). A bottom area rudder plate (8) is installed at the lower end of the reinforcing rudder plate (10). A rudder guide plate (9) is installed on one side of the bottom area rudder plate (8).
2. The method for arranging the plate seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel according to claim 1, characterized in that: The reinforcing zone rudder plate (10) and the top zone rudder plate (12) are equipped with hanging pipes (19), and a top detachable plate (14) is embedded in the reserved opening between the top plate (3) and the top zone rudder plate (12).
3. The method for arranging the plate seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel according to claim 1, characterized in that: The rudder blade (21) is provided with a tail plate (6) at its rear end, and a tail area rudder plate (7) is welded to one side of the tail plate (6).
4. The method for arranging the plate seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel according to claim 1, characterized in that: The top plate (3), bottom plate (4), bottom area rudder plate (8), reinforced area rudder plate (10), top area rudder plate (12), stern area rudder plate (7), stern plate (6) and rudder guide plate (9) are made of Grade A / B / D / E marine steel plates, and the plate seams are preferably arranged in the positions of the reinforcing members inside the horizontal bulkhead (16) and vertical bulkhead (15).
5. The method for arranging the plate seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel according to claim 1, characterized in that: The horizontal partition (16) and the vertical partition (15) are provided with weight-reducing holes, and the pad (18) is used to adjust the welding bevel of steel plates of different thicknesses.
6. The method for arranging the plate seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel according to claim 4, characterized in that: The welds of the top plate (3), bottom plate (4), tail plate (6), tail area rudder plate (7), bottom area rudder plate (8), rudder guide plate (9), reinforced area rudder plate (10) and top area rudder plate (12) to the upper cast steel part (1) and lower cast steel part (2) are subjected to 100% ultrasonic and magnetic particle testing.
7. The method for arranging the plate seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel according to claim 6, characterized in that: The edges of the top plate (3) and bottom plate (4) are rounded with R3. The detachable body (11), the bottom detachable body (13) and the top detachable plate (14) are fixedly connected to the corresponding reinforced area rudder plate (10) and the top area rudder plate (12) by bolts.
8. The method for arranging the plate seams on the outer plate of the rudder blade of a refined oil and chemical transport vessel according to claim 1, characterized in that: The rudder blade (21) is provided with drain plugs (20) in the top and bottom areas inside the rudder blade (21) to drain the water accumulated in the cavity of the rudder blade (21).
9. The method for arranging the plate seams of the outer plate of the rudder blade of a refined oil and chemical transport vessel according to claim 3, characterized in that: The tail area rudder plate (7) is located at the rear of the rudder blade (21), and the tail area rudder plate (7) is welded to the tail plate (6), the lower bottom area rudder plate (8), and the upper top area rudder plate (12).
10. The method for arranging the plate seams on the outer plate of the rudder blade of a refined oil and chemical transport vessel according to claim 1, characterized in that: Includes the following steps: 1) Lofting is carried out with the center line of the rudder blade (21) as the reference to determine the boundary of the outer plate. The precise dimensions of the components are determined by the lofting. Unless otherwise specified, the port and starboard structures are symmetrical. 2) The outer plate assembly is composed of the top plate (3), bottom plate (4), tail plate (6), tail area rudder plate (7), bottom area rudder plate (8), rudder guide plate (9), reinforced area rudder plate (10) and top area rudder plate (12) according to the outline of the rudder blade (21). The plate seams are preferably arranged in the middle of the inner top plate (5), vertical partition (15), horizontal partition (16), elbow plate (17) and pad plate (18) to avoid stress concentration areas. The direction of the plate seams should be parallel to the direction of water flow or intersect at a small angle. 3) The plate seams adopt full penetration butt welding. The welds connected to the castings are subjected to 100% ultrasonic and magnetic particle testing. The butt welds of the outer plate components are subjected to 100% ultrasonic testing. 4) The joints of the plates in special locations such as plug weld holes, detachable maintenance areas, and hanging pipe (19) areas are designed separately to ensure water tightness and structural strength; 5) After the rudder blade (21) is completed, a 0.02MPa air tightness test is conducted. After the test is passed, a vapor phase corrosion inhibitor is filled inside.