Special coating construction process for methanol fuel cabin

Abstract

The invention discloses a special coating construction process for a methanol fuel cabin. The special coating construction process comprises the following steps: arranging a scaffold; pre-sand washing is conducted on the interior of the methanol fuel cabin; cleaning the interior of the methanol fuel cabin; carrying out main sand washing on the methanol fuel cabin; first-time paint spraying is conducted on the whole methanol fuel cabin; paint mist is removed, and first-time repairing spraying is conducted on the part where the continuous closed paint film is not formed; ventilating and drying the methanol fuel cabin; the methanol fuel cabin is watered and solidified; removing protectors; removing the scaffold; carrying out vacuum sand washing and secondary repairing and spraying on the supporting part of the scaffold on the bottom surface; watering and curing the part repaired and sprayed for the second time; performing a fresh water soaking cabin test; performing final inspection on the methanol fuel cabin; and cabin delivery is completed. By using the process, a fresh water soaking cabin test can be completed at a wharf fitting-out stage before trial flight, the water quality meets the environmental protection requirement, the methanol dual-fuel ship does not need to be subjected to secondary trial flight, and a large amount of trial flight cost can be saved.

Description

Technical Field

[0001] The invention relates to the technical field of ship coating, and in particular to a special coating construction process for a methanol fuel tank. Background Art

[0002] During ship construction, different coating construction plans are formulated for different areas of the ship according to the corrosive environment of its location and the hull structure. Among them, the fuel tank, as the storage compartment of the ship's fuel, requires a special coating process.

[0003] The fuel stored in ordinary fuel tanks is usually fuel oil. Therefore, when applying special coating to fuel tanks storing fuel oil, it is necessary to first spray the surrounding walls and top walls of the fuel tank with one coat of paint, two coats of paint and three coats of paint, and then spray the bottom surface of the fuel tank with one coat of paint, two coats of paint and three coats of paint. Finally, ventilate and cure. After the coating is completely cured, remove the scaffolding. During the sea trial, press seawater into the fuel tank or use seawater for spraying to expose the missing points. After the sea trial, repair the missing points to complete the special coating construction.

[0004] New energy ships are gradually put into use in shipping, among which methanol, as an excellent green energy, is gradually widely used as ship fuel. Due to the influence of methanol, the fuel tank of the methanol ship cannot use pure epoxy or phenolic epoxy paint for three-layer coating process, and can only use the appropriate inorganic zinc silicate paint, and inorganic zinc silicate paint can only be coated once, so the special coating construction process of the fuel tank cannot be directly applied.

[0005] At the same time, unlike fuel oil tanks which can undergo blister tests during sea trials, methanol fuel tanks need to be painted before sea trials in order to achieve the purpose of loading methanol fuel for sea trials. If methanol cannot be loaded during the first sea trial, it means that a second sea trial is required.

[0006] Therefore, it is necessary to provide a special coating construction process for a methanol fuel tank to solve the above technical problems. Summary of the invention

[0007] The purpose of the present invention is to provide a special coating construction process for a methanol fuel tank in view of the shortcomings of the prior art. The special coating construction of the methanol fuel tank can be completed by a single coating without rework, thereby ensuring that the methanol fuel tank meets the loading requirements of methanol fuel before the sea trial.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] A special coating construction process for a methanol fuel tank, the methanol fuel tank comprising a top wall, a bottom surface and a surrounding wall, the special coating construction process for the methanol fuel tank comprising the following steps:

[0010] S1, erecting scaffolding inside the methanol fuel tank;

[0011] S2, pre-sandwash all welds inside the methanol fuel tank and parts that need special coating, and carry out structural repairs;

[0012] S21, pre-sandblast the weld to Sa2 1 / Level 2: After pre-sandblasting, the surface defects of the steel structure shall be treated as required;

[0013] S3, clean the interior of the methanol fuel tank to remove oil, moisture, welding slag, dust and other debris;

[0014] S4, the methanol fuel tank is mainly sand-washed, and the interior of the methanol fuel tank is cleaned and protected after the main sand-washing is completed;

[0015] S41, using abrasives of appropriate proportions, remove the shop primer from all surfaces to be painted inside the methanol fuel tank through primary sandblasting and achieve Sa2 1 / 2 level, roughness is 30-85μm;

[0016] S42, all unpainted outfitting parts in the methanol fuel tank shall be wrapped and protected with protective materials;

[0017] S43, using plastic film to cover the surrounding wall, top wall and bottom surface in layers to avoid paint mist pollution;

[0018] S5, spray paint the entire methanol fuel tank with inorganic zinc silicate paint;

[0019] S6, remove the paint mist, perform the first repair spraying on the parts where the continuous closed paint film has not been formed, and make up the film thickness;

[0020] S7, ventilate and dry the methanol fuel tank;

[0021] S8, use a sprinkler to evenly sprinkle water on the methanol fuel tank, and increase the humidity in the tank by atomizing water until the inorganic zinc silicate paint is completely cured;

[0022] S9, remove protective materials and perform passivation treatment on unpainted stainless steel outfitting parts;

[0023] S10, dismantling scaffolding;

[0024] S11, vacuum sandblasting, second repair spraying and cleaning of the bottom scaffolding support parts;

[0025] S12, evenly spraying water on the second repair sprayed part in step S11 until the inorganic zinc silicate paint is completely cured;

[0026] S13, fresh water soaking test, the whole tank is filled with clean fresh water up to the top wall of the tank, the tank is sealed for 24 hours and then emptied;

[0027] S14, after the methanol fuel tank is emptied, wash the tank immediately with high-pressure fresh water, rinse it clean and then blow it dry with compressed air to make the inside of the methanol fuel tank completely dry, and conduct a final inspection of the entire methanol fuel tank to check whether there is any coating leakage or coating damage. If there is any coating leakage or coating damage, perform a third repair spray and curing;

[0028] S15, completion of cabin delivery.

[0029] Preferably, in the S5 step, the method of spraying the paint once is: spraying in the order of bottom surface, top wall, and surrounding wall, and removing the corresponding plastic film layer by layer according to the spraying order, the paint film thickness of each sprayed surface is consistent, and the dry film thickness of each sprayed surface is 100μm.

[0030] Preferably, in the step S42, the protective material is a white canvas.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. The special coating construction process can complete the freshwater tank test at the dock outfitting stage before the sea trial, and the water quality meets the environmental protection requirements, ensuring that the methanol dual-fuel ship does not need to conduct a second sea trial, which can save a lot of sea trial costs.

[0033] 2. Compared with the special coating of the fuel tank of traditional fuel oil ships, which requires the surrounding wall, top wall and bottom surface to be constructed twice, this process can complete all the special coating operations of the surrounding wall, top wall and bottom surface in one construction, which shortens the process and construction cycle and reduces the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a flow chart of the steps of the special coating construction process for the methanol fuel tank; DETAILED DESCRIPTION

[0035] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0036] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixed connection" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0037] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0038] like Figure 1 As shown, a special coating construction process for a methanol fuel tank, the methanol fuel tank includes a top wall, a bottom surface and a surrounding wall, and the special coating construction process for the methanol fuel tank includes the following steps:

[0039] S1, erecting scaffolding inside the methanol fuel tank;

[0040] S2, pre-sandwash all welds inside the methanol fuel tank and parts that need special coating, and carry out structural repairs;

[0041] S21, pre-sandblast the weld to Sa2 1 / Level 2: After pre-sandblasting, the surface defects of the steel structure shall be treated as required;

[0042] S3, clean the interior of the methanol fuel tank to remove oil, moisture, welding slag, dust and other debris;

[0043] S4, the methanol fuel tank is mainly sand-washed, and the interior of the methanol fuel tank is cleaned and protected after the main sand-washing is completed;

[0044] S41, using abrasives of appropriate proportions, remove the shop primer from all surfaces to be painted inside the methanol fuel tank through primary sandblasting and achieve Sa2 1 / 2 level, roughness is 30-85μm;

[0045] S42, all unpainted outfitting parts in the methanol fuel tank shall be wrapped and protected with white canvas;

[0046] S43, using plastic film to cover the surrounding wall, top wall and bottom surface in layers to avoid paint mist pollution;

[0047] S5, use inorganic zinc silicate paint to spray the entire methanol fuel tank with a first-time paint. The method of spraying the first-time paint is: spraying in the order of bottom surface, top wall, and surrounding wall, and removing the corresponding plastic film layer by layer according to the spraying order. The paint film thickness of each sprayed surface is consistent, and the dry film thickness of each sprayed surface is 100μm;

[0048] S6, remove the paint mist, perform the first repair spraying on the parts where the continuous closed paint film has not been formed, and make up the film thickness;

[0049] S7, ventilate and dry the methanol fuel tank;

[0050] S8, use a sprinkler to evenly sprinkle water on the methanol fuel tank, and increase the humidity in the tank by atomizing water until the inorganic zinc silicate paint is completely cured;

[0051] S9, remove protective materials and perform passivation treatment on unpainted stainless steel outfitting parts;

[0052] S10, dismantling scaffolding;

[0053] S11, vacuum sandblasting, second repair spraying and cleaning of the bottom scaffolding support parts;

[0054] S12, evenly spraying water on the second repair sprayed part in step S11 until the inorganic zinc silicate paint is completely cured;

[0055] S13, fresh water soaking test, the whole tank is filled with clean fresh water up to the top wall of the tank, the tank is sealed for 24 hours and then emptied;

[0056] S14, after the methanol fuel tank is emptied, wash the tank immediately with high-pressure fresh water, rinse it clean and then blow it dry with compressed air to make the inside of the methanol fuel tank completely dry, and conduct a final inspection of the entire methanol fuel tank to check whether there is any coating leakage or coating damage. If there is any coating leakage or coating damage, perform a third repair spray and curing;

[0057] S15, completion of cabin delivery.

[0058] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A special coating construction process for a methanol fuel tank, the methanol fuel tank comprising a top wall, a bottom surface and a surrounding wall, characterized in that: The special coating construction process of the methanol fuel tank comprises the following steps: S1, erecting scaffolding inside the methanol fuel tank; S2, pre-sandwash all welds inside the methanol fuel tank and parts that need special coating, and carry out structural repairs; S21, pre-sandblast the weld to Sa2 1 / Level 2: After pre-sandblasting, the surface defects of the steel structure shall be treated as required; S3, clean the interior of the methanol fuel tank to remove oil, moisture, welding slag, dust and other debris; S4, the methanol fuel tank is mainly sand-washed, and the interior of the methanol fuel tank is cleaned and protected after the main sand-washing is completed; S41, using abrasives of appropriate proportions, remove the shop primer from all surfaces to be painted inside the methanol fuel tank through primary sandblasting and achieve Sa2 1 / 2 level, roughness is 30-85μm; S42, all unpainted outfitting parts in the methanol fuel tank shall be wrapped and protected with protective materials; S43, using plastic film to cover the surrounding wall, top wall and bottom surface in layers to avoid paint mist pollution; S5, spray paint the entire methanol fuel tank with inorganic zinc silicate paint; S6, remove the paint mist, perform the first repair spraying on the parts where the continuous closed paint film has not been formed, and make up the film thickness; S7, ventilate and dry the methanol fuel tank; S8, use a sprinkler to evenly sprinkle water on the methanol fuel tank, and increase the humidity in the tank by atomizing water until the inorganic zinc silicate paint is completely cured; S9, remove protective materials and perform passivation treatment on unpainted stainless steel outfitting parts; S10, dismantling scaffolding; S11, vacuum sandblasting, second repair spraying and cleaning of the bottom scaffolding support parts; S12, evenly spraying water on the second repair sprayed part in step S11 until the inorganic zinc silicate paint is completely cured; S13, fresh water soaking test, the whole tank is filled with clean fresh water up to the top wall of the tank, the tank is sealed for 24 hours and then emptied; S14, after the methanol fuel tank is emptied, wash the tank immediately with high-pressure fresh water, rinse it clean and then blow it dry with compressed air to make the inside of the methanol fuel tank completely dry, and conduct a final inspection of the entire methanol fuel tank to check whether there is any coating leakage or coating damage. If there is any coating leakage or coating damage, perform a third repair spray and curing; S15, completion of cabin delivery.

2. The special coating construction process for a methanol fuel tank according to claim 1 is characterized in that: In the S5 step, the method of spraying the paint once is: spraying in the order of bottom surface, top wall, and surrounding wall, and removing the corresponding plastic film layer by layer according to the spraying order, the paint film thickness of each sprayed surface is consistent, and the dry film thickness of each sprayed surface is 100μm.

3. The special coating construction process for a methanol fuel tank according to claim 1 is characterized in that: In the step S42, the protective material is a white canvas.

Images