A method for installing a methanol tank of a dual-fuel container ship

Abstract

The application discloses a kind of installation construction methods of methanol cabin of dual-fuel container ship, it is related to methanol cabin foot hand construction technical field, solve the problem that methanol cabin inner foot hand eye plate is cut off after special coating is completed again, will damage cabin in the paint that has been completed, repair cost is high, influence construction period include following steps, first in the end of foot hand eye plate and ship body welding, welding seam preset distance, welding edge outside the part is polished, then passivation treatment is carried out to foot hand eye plate, and special coating construction is carried out to the part of polishing treatment, then install foot hand horse and carry out special coating construction in cabin, after construction is completed, remove foot hand horse, and when removing, the part of passivation film damage / rust on foot hand eye plate is re-acid pickling, passivation treatment.It can keep foot hand eye plate permanently in cabin, and the effect of reducing repair cost and construction difficulty is achieved.

Description

Technical Field

[0001] This invention relates to the field of methanol tank scaffolding construction technology, and in particular to a method for scaffolding installation in the methanol tank of a dual-fuel container ship. Background Technology

[0002] Compared to conventional fuel container ships, the methanol tank special coating process and the trough-shaped wall construction process with fewer free edges of the dual-fuel container ships are new designs and processes. Methanol is corrosive when it contains water, so the tank interior coating requires the use of inorganic zinc silicate special coating process. Due to its own characteristics, inorganic zinc silicate coating has many construction procedures, high requirements, and the cost and difficulty of repairing coating damage after construction are high. In order to ensure the quality of special coating construction, the tank interior should have as few structural components, free edges and welds as possible. However, the methanol tank special coating is carried out on the whole tank after the tank is completed, and the methanol tank needs to be designed with full-tank scaffolding.

[0003] Removing the scaffolding panels inside the methanol tank after the special coating is applied would damage the already finished paint inside the tank, resulting in very high repair costs and impacting the construction period. Therefore, there is an urgent need to design a scaffolding installation method for the methanol tank of a dual-fuel container ship that can permanently retain the scaffolding panels inside the tank without requiring removal. Summary of the Invention

[0004] The purpose of this invention is to provide a scaffolding installation method for the methanol tank of a dual-fuel container ship, which can permanently retain the scaffolding boards inside the tank, reducing repair costs and construction difficulty.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A method for scaffolding installation in the methanol tank of a dual-fuel container ship includes the following steps: First, at the end of the scaffold eye plate that is welded to the hull, the part within the preset distance of the weld and outside the weld edge is ground. Then, the scaffold eye plate is passivated, and a special coating is applied to the ground part. After that, the scaffolding is installed and the interior of the cabin is coated. After the construction is completed, the scaffolding is removed, and during the removal, the parts of the scaffold eye plate that are damaged / corroded are pickled and passivated again.

[0006] Furthermore, the polishing process includes deburring, rounding, and fine polishing.

[0007] Furthermore, the chamfer radius at the corners of the scaffold eyeboard after grinding is not less than 3mm.

[0008] Furthermore, the preset distance is not less than 100mm.

[0009] Furthermore, the scaffold eyeboard is lengthened so that after the scaffolding is installed, the scaffold eyeboard retains a free edge within the preset distance.

[0010] Furthermore, the scaffolding includes a horizontal steel mesh for steel shot to seep downwards, and there are gaps between adjacent scaffolding in the horizontal direction.

[0011] Furthermore, the holes for installing the scaffolding horses on the scaffolding eyeboard on the ramp inside the cabin are angled, ensuring that the scaffolding horses are horizontal.

[0012] Furthermore, the scaffolding eyeboards installed on the unsupported side of the bulkhead are made of SUS316L material.

[0013] Furthermore, the scaffold eyeboards are protected with white canvas or plastic film before the special coating is applied.

[0014] In summary, the present invention has the following beneficial effects: Surface treatment using free-edge 3R sanding before painting can significantly improve coating adhesion, durability, and appearance quality, while reducing the risk of coating defects. It can also permanently retain scaffolding boards inside the cabin, reducing repair costs and construction difficulty. Attached Figure Description

[0015] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the parts undergoing "3R" grinding treatment in the scaffolding installation construction method for the methanol tank of a dual-fuel container ship according to the present invention. Figure 2 This is a schematic diagram of the "3R" grinding principle in the scaffolding installation construction method for the methanol tank of a dual-fuel container ship according to the present invention. Figure 3 This is a schematic diagram of the extended scaffolding design in the scaffolding installation construction method for the methanol tank of a dual-fuel container ship according to the present invention; Figure 4 This is a schematic diagram of the scaffolding on the inclined plate of the trough-shaped bulkhead in the scaffolding installation construction method of the methanol tank of a dual-fuel container ship according to the present invention. Figure 5 This is a schematic diagram of the overall distribution of the scaffolding in the methanol tank of a dual-fuel container ship, as described in this invention. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0018] A method for scaffolding installation in the methanol tank of a dual-fuel container ship includes the following steps: Step S10, as follows Figure 1 and Figure 2 As shown, the scaffolding plates installed on the non-framed side of the bulkhead are made of SUS316L material (the same as the outfitting components in the methanol tank); in this embodiment, all scaffolding plates are made of SUS316L material; firstly, within a preset distance of the weld (in this embodiment, the preset distance is not less than 100mm), the part of the scaffolding plate welded to the hull (except for the weld edge) is subjected to "3R" grinding treatment, then all scaffolding plates are passivated, and the ground part (within ABT.100MM of the weld to the hull structure) is specially coated, while the rest does not require special coating; Among them, such as Figure 3 As shown, to ensure the coating quality at the base of the scaffold eyeboard, the scaffold eyeboard is designed to be extended so that after the scaffold horse is installed, the scaffold eyeboard can retain a free edge within a preset distance (about 100mm); the "3R" sanding process includes deburring, rounding, and fine sanding, and the chamfer radius at the corners of the scaffold eyeboard after sanding is not less than 3mm. "3R" sanding treatment can improve adhesion. By performing 3R (deburring, rounding, and fine sanding) on ​​free edges, sharp burrs and unevenness at the edges can be effectively eliminated, allowing the coating to adhere more evenly and tightly to the substrate, reducing the risk of coating peeling due to stress concentration at the edges. It can also enhance the protective properties of the coating. Free edges are often the weakest parts of the coating and are easily damaged by collisions or corrosion. 3R sanding makes the edges smooth and rounded, allowing the coating to better cover the edges and corners, forming a continuous and uniformly thick protective film, significantly improving the overall corrosion resistance and wear resistance. Finely sanded free edges can prevent problems such as sagging, edge shrinkage, or uneven accumulation of the coating at the edges and corners, making the coated surface smoother and more beautiful, and improving the appearance of the coating. Improve overall process quality; untreated free edges are prone to coating cracking, blistering or premature failure, while 3R sanding eliminates these hidden dangers, reduces coating rework rate and maintenance costs. Standardized 3R sanding can also make the edge treatment more consistent, which is convenient for subsequent coating operations (such as spraying and brushing), shortens construction time, and reduces repair work caused by edge problems.

[0019] To facilitate the cleaning of accumulated sand during sandblasting, the scaffolding includes horizontal steel grating mesh scaffolding boards (instead of ordinary wooden boards) to allow steel sand to seep downwards, making it less likely for sand to accumulate. At the same time, the scaffolding boards do not overlap, effectively preventing sand accumulation between overlapping scaffolding boards. There is a gap of not less than 20mm (not exceeding 50mm) between adjacent scaffolding boards in the horizontal direction, and the distance between the outer end of the scaffolding board and the transverse bulkhead is greater than 300mm. like Figure 4 and Figure 5 As shown, to ensure the quality of the special coating construction and to take into account the coating construction inside and outside the trough, the height of the scaffolding layer inside the methanol tank cannot be set too high. In this embodiment, it is set at about 1750mm (which can be adjusted between 1700-2000mm). The scaffolding eye plates installed on the trough slope are cut and welded at their welding edges (or the holes for installing the scaffolding horses on the scaffolding eye plates are set at an angle) to ensure the level of the scaffolding horses and steel mesh. At the same time, the scaffolding design needs to be checked for interference with the methanol pipeline, methanol pump support, PMA, and channel steel reinforcement.

[0020] Step S20: Then install the scaffolding and perform sandblasting and / or special coating on the interior of the cabin. The scaffolding eyeboards are protected by being wrapped with rubber before sandblasting and by being protected with white canvas or plastic film before special coating. Step S30: After the construction is completed, remove the scaffolding and, during the removal, re-acid-wash and passivate the damaged / corroded parts of the passivation film on the scaffolding eye plate (e.g., sandblasting or damage to the passivation film caused by the installation of the scaffolding). This embodiment can also be extended to the design of methanol tank scaffolding for other methanol-fueled new energy ships.

[0021] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within the scope of its essence and protection. Such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A method for scaffolding installation in the methanol tank of a dual-fuel container ship, characterized in that: Includes the following steps, First, at the end of the scaffold eye plate that is welded to the hull, the part within the preset distance of the weld and outside the weld edge is ground. Then, the scaffold eye plate is passivated, and a special coating is applied to the ground part. After that, the scaffolding is installed and the interior of the cabin is coated. After the construction is completed, the scaffolding is removed, and during the removal, the parts of the scaffold eye plate that are damaged / corroded are pickled and passivated again.

2. The scaffolding installation method for the methanol tank of a dual-fuel container ship according to claim 1, characterized in that: The polishing process includes deburring, rounding, and fine polishing.

3. A scaffolding installation method for a methanol tank on a dual-fuel container ship according to claim 1 or 2, characterized in that: The chamfer radius at the corners of the scaffold eyeboard after grinding is not less than 3mm.

4. The scaffolding installation method for the methanol tank of a dual-fuel container ship according to claim 1, characterized in that: The preset distance is not less than 100mm.

5. A scaffolding installation method for a methanol tank on a dual-fuel container ship according to claim 1 or 4, characterized in that: The scaffold eyeboard is lengthened so that after the scaffolding is installed, the scaffold eyeboard retains a free edge within the preset distance.

6. The scaffolding installation method for the methanol tank of a dual-fuel container ship according to claim 1, characterized in that: The scaffolding includes a horizontal steel mesh for steel shot to seep downwards, and there are gaps between adjacent scaffolding in the horizontal direction.

7. A scaffolding installation method for a methanol tank on a dual-fuel container ship according to claim 1 or 6, characterized in that: The holes for installing scaffolding horses on the scaffolding eyeboard on the ramp inside the cabin are at an angle, which makes the scaffolding horses horizontal.

8. The scaffolding installation method for the methanol tank of a dual-fuel container ship according to claim 1, characterized in that: The scaffolding eyeboards installed on the unsupported side of the bulkhead are made of SUS316L material.

9. The scaffolding installation method for the methanol tank of a dual-fuel container ship according to claim 1, characterized in that: The scaffolding and eyeboards are protected with white canvas or plastic film before the special coating is applied.

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