KR100789013B1 - A pollutant adhesion prevention method on stainless steel pipe surface for LNGC/LPGC ship - Google Patents

Abstract

The present invention is attached to the surface of the stainless steel pipe and the stationary contaminants such as iron particles, welding spatter and grinding particles generated during the design work of LNG and LPG ships on the main deck to corrosive environment such as seawater splash state during operation of the ship Instead of the plastic cover used to prevent corrosion from accelerating, the vinyl-based resin is generally a strippable that can be temporarily painted on the contaminated part of the object using a weak adhesion to metal and can be easily peeled off when necessary. By coating the paint on the surface of the stainless steel pipe 10 and the fixing part 20, process water and cost is reduced, and relates to a method for preventing surface contaminant adhesion of the stainless steel pipe for ships that is easy to maintain and maintain.

Description

A pollutant adhesion prevention method on stainless steel pipe surface for LNGC / LPGC ship}

1 shows a stainless steel tubing with a vinyl cover attached thereto.

Figure 2 is a flow chart showing the process sequence of the method for preventing surface contaminant adhesion of stainless steel piping for ships using a plastic cover.

3 is a view showing a stainless steel pipe to which a strippable paint according to an embodiment of the present invention is applied.

Figure 4 is a flow chart showing the process sequence of the surface contaminant adhesion prevention method of the stainless steel pipe to which the strippable paint according to an embodiment of the present invention is applied.

<Brief description of symbols for the main parts of the drawings>

10: stainless steel pipe 20: fixed part

The present invention relates to a contaminant adhesion prevention method for preventing contaminants suspended in the air from adhering to the surface of a stainless steel pipe installed on the main deck of a vessel carrying cryogenic liquefied gas such as LNG and LPG carriers. Preferably, contaminants such as iron particles, welding spatters, and grinding particles generated during the design work at the vessel's inner wall stage are attached to the stainless pipe surface and the fixed part installed on the main deck, so that the water splashes during the operation of the ship. Metal stripper paint is used instead of the plastic cover used to prevent the acceleration of corrosion in corrosive environments such as metals. It is about.

In general, a variety of devices are installed on a ship, and the devices are connected to each other by using pipes made of various metals suitable for a purpose so that the entire ship can perform an organic action.

In order to prevent the corrosion of the pipe in the corrosive environment such as sea water splash during operation of the ship, the coating on the inner and outer surfaces of the pipe with rust-preventive paint and the color paint on the inner surface of the pipe and zinc on the inner and outer surfaces of the pipe And plating of aluminum and aluminum, and for the handling of corrosive chemicals such as phosphoric acid and cooling pipes of inert gas equipment where pipe corrosion is a problem, rubber linings covered with synthetic rubber and the surface of the pipe are made of synthetic resin or glass. There is a method of coating using glass.

In particular, as a main pipe of a vessel carrying cryogenic liquefied gas such as LNG and LPG carriers, stainless steel pipe, which is a pipe that contains a large amount of chromium and nickel and requires corrosion resistance as a pipe resistant to corrosion, is used.

However, the LNG and LPG carriers are moored on the quay for a long time after launching, where the surface of the stainless steel pipe installed on the hull main deck is made of iron powder, grinding particles and welding spatter generated during the design work of the ship and scattered to the atmosphere. The same contaminants are attached and guided to the ship's hull, giving rise to the acceleration of surface corrosion in corrosive environments such as seawater splashes.

As a countermeasure to prevent this, a method of protecting a surface of a stainless steel pipe using a vinyl cover is used. FIG. 1 is a view illustrating a stainless steel pipe with a vinyl cover attached thereto. A contaminant adhered to the surface is removed through a pickling process in which the stainless pipe manufactured by unit is mixed in the mixed washing liquid.

After passing through the pickling process, the surface of the stainless pipe 1 is protected by using a vinyl cover 2 to prevent contaminants scattered in the air from being attached to the surface after being assembled at the assembly site.

The plastic cover 2 protecting the surface of the stainless pipe 1 is removed just before delivery to the ship owner after the ship is completed.

FIG. 2 is a flow chart showing a process sequence of a surface contaminant adhesion prevention method of a stainless steel pipe for ships using a plastic cover, and as shown in the drawing, the stainless steel pipe is manufactured in units of mounting parts in a workshop for manufacturing a stainless steel pipe. (ST 10)

Stainless steel pipes manufactured by unit in the workshop are subjected to a pickling process in which a cleaning solution composed of hydrofluoric acid and nitric acid is deposited to remove contaminants attached to the surface of the stainless steel pipe during operation. (ST 20)

The contaminants removed from the contaminants attached to the surface through the pickling process are each assembled in parts in the unit workplace (ST 30), and the surfaces of the stainless pipes assembled for each part are protected by using a vinyl cover. Prevents contaminants from adhering to the workplace atmosphere (ST 40)

The plastic sheath protecting the surface of the stainless steel pipe is removed just before delivery to the owners after the ship has finished drying (ST 50).

The method for preventing surface contaminant adhesion of the stainless steel pipe for ships using the plastic cover having the above configuration requires excessive process water and cost to install the plastic cover on the surface of the stainless pipe, and delays the installation work of the plastic cover. Contaminants are attached to the cost and the number of processes required to remove the contaminants additionally, the plastic cover is opaque, it is impossible to take precautions when a defect occurs, it is difficult to apply to the pipe fixing parts such as U bolts.

An object of the present invention devised to solve the problems as described above is to provide a method for preventing the attachment of contaminants to reduce the number of processes and costs, easy maintenance and maintenance, and applicable to any part.

In order to achieve the object of the present invention as described above, after the temporary coating on the surface and the pipe fixing portion of the stainless steel pipe is installed on the main deck is temporarily commercially available for stripping to be removed after a certain time Provides a method for preventing surface contaminant adhesion from stainless steel piping for ships using paint.

Hereinafter, a method for preventing surface contaminant adhesion of a stainless steel pipe for ships according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view illustrating a stainless pipe to which a strippable paint is applied according to an embodiment of the present invention. As shown in the drawing, the stainless pipe 10 from which contaminants adhered to a surface through a pickling process is removed. And each fixing part 20 is a metal stripable paint on the surface of the stainless pipe 10 and the fixing part 20 in order to prevent the contaminants scattered in the air after being assembled in the assembly site to adhere to the surface It is painted.

The stripable paint for metal, which is painted on the surface of the stainless pipe 10 and the fixing part 20, is removed just before being delivered to the ship owner after the drying of the ship is completed.

FIG. 4 is a flowchart illustrating a process sequence of a method for preventing surface contaminant adhesion of a stainless pipe to which a strippable paint is applied according to an embodiment of the present invention. As shown in the drawing, FIG. The stainless steel pipe is manufactured in units (ST 100).

Stainless steel pipes manufactured in parts in the workplace are subjected to a pickling process in which a cleaning solution composed of hydrofluoric acid and nitric acid is deposited to remove contaminants attached to the surface of the stainless steel pipe during operation. (ST 200)

Stripper coating is applied to prevent contaminants generated in the workplace from being adhered to the surface of the stainless steel pipe from which the contaminants attached to the surface are removed through the pickling process. (ST 300)

The stainless steel pipes coated on the surface of the strippable paint are assembled at each unit in the unit workplace (ST 400), and each of the stainless steel pipes is assembled to the fixed parts of the stainless pipes which are completed by the respective parts, and the stripped paint is applied to the suspended parts. To prevent contaminants from scattering in the air (ST 500)

The strippable paint protecting the surface of the stainless steel pipe is removed just before delivery to the owners after the ship has finished drying (ST 600).

The stripable paint for metals used in the method for preventing surface contaminant adhesion of stainless steel pipes according to the embodiment of the present invention having the above-described configuration is characterized in that vinyl-based resins generally have a weak adhesion to metals. It is used as a paint to temporarily or partially paint all or part of the finished product for antifouling, and when necessary, it can be easily peeled off.When the thickness of the film is thin, it becomes one sheet when removing. It is difficult to paint with a thick film, and to be careful when painting with paintbrush or spray, vinyl-based strong solvents are not used when the floor coating or material (especially plastic) is invaded.

The present invention composed of the above configuration is simple construction and the process and cost is reduced, easy to maintain and maintain, the film film generated after the paint drying is a translucent material, it is possible to take action in the event of piping defects and insulation and painting process It also has the effect that it can be applied.

Claims (2)

In stainless pipes with vinyl covers to prevent contaminants from scattering in the atmosphere of the workplace and attached to the main deck of LNG and LPG carriers, vinyl-based resins generally have weak adhesion to metals. A method for preventing surface contaminants adhered to a stainless steel pipe for ships, characterized in that the coating is applied to the surface of the stainless steel pipe (10) and the fixing part (20), which can be temporarily peeled off and simply peeled off when necessary. The method according to claim 1, wherein the stainless steel pipes are manufactured in units of mounting parts in a workshop for manufacturing stainless steel pipes (ST 100), and the stainless steel pipes manufactured in units of parts in the workshop include a hydrofluoric acid and nitric acid. A step of performing a pickling process to be deposited (ST 200), a step of coating a strippable paint on the surface of the stainless pipe subjected to the pickling process (ST 300), the stainless pipe coated with the stripable paint in the unit workplace The step of assembling the parts (ST 400), the fixed portion of the stainless pipe is assembled for each part and the step of painting the strippable paint on the reserved portion (ST 500), the stripable paint protecting the stainless pipe Surface of the marine stainless steel pipe, characterized in that consisting of the step (ST 600) to be removed Contamination Prevention Method.

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