Precision control method for large-diameter valve in pressurized gallery

Abstract

This invention provides a method for controlling the precision of ultra-large diameter valves in pressurized corridors, belonging to the field of building construction technology. This method includes the following steps: using BIM software to simulate and analyze the construction process, predicting problems during valve hoisting and pre-embedding to determine the location and effect after pre-embedding, while simultaneously processing the components; Step 1: Assembling the processed components; Step 2: Laying out and positioning the valves to be installed on the construction site; Step 3: Pre-embedding the sleeves; Step 4: Adjusting the sleeve precision; Step 5: Installing the valves; Step 6: Adjusting the valve precision; Step 7: Performing node verification of valve precision and recording quality; if the precision is unqualified, repeat step 8; if the precision is qualified, proceed to the next step; Step 9: Conducting site cleanup and final acceptance.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to a method for precision control of ultra-large diameter valves in pressurized corridors. Background Technology

[0002] With the continuous development of my country's transportation network, the demand for highways and railways is increasing. However, for areas with harsh construction conditions, transportation is still inaccessible. The construction of ultra-long span bridges, especially deep-sea bridges, has become a key area for technological breakthroughs, making the construction of deep-water long-span laboratories particularly important. The construction of deep-water long-span laboratories includes deep-water wave and current test pool facilities, wave generation systems, wave damping systems, power control systems, wave generation control rooms, and wave generator protection facilities. This experimental platform can meet the large-scale model tests of large and complex deep-water long-span bridge structures in major national projects, with a diameter of up to 1.5m. It can also achieve local wave and current generation, meeting the needs of numerous small and medium-sized conventional experimental research. This reduces operating costs and saves energy. Since ultra-large diameter valves are generally over 1.2m, installation is difficult, thus placing higher demands on the pre-embedding and precision control of ultra-large diameter valves in the pressurized corridors for wave and current generation.

[0003] Chinese invention patent (application number: CN201611129831.4), publication number CN106624639B, provides a method for the fabrication and hoisting of pre-assembled short joints for large valves and large-diameter pipelines. The method involves fabricating prefabricated sections and pre-assembled wholes in a ground-based processing area, then using vertical transport machinery to hoist the pre-assembled wholes into position and weld them to the installed overhead large-diameter pipeline. The process flow is as follows: construction preparation → prefabricated section fabrication → pre-assembled whole fabrication → pre-assembled whole hoisting → pre-assembled whole welding to the installed overhead pipeline → acceptance. This hoisting method simplifies the cumbersome and difficult high-altitude operation process to be completed in a ground-based processing area, thus solving problems such as cumbersome traditional construction procedures, long construction cycles, large operating area requirements for high-altitude operations, and difficulty in guaranteeing welding and installation quality. The entire construction process is safe, stable, and controllable, with high installation accuracy, shortening the construction cycle, improving construction efficiency, saving labor and material costs, and resulting in significant economic benefits.

[0004] The above-mentioned invention method cannot meet the requirements for pre-embedding and precision control of ultra-large diameter valves in pressure corridors. Summary of the Invention

[0005] In view of this, the present invention provides a method for precision control of ultra-large diameter valves in pressurized channels, which can meet the requirements for pre-embedding and precision control of ultra-large diameter valves in pressurized channels.

[0006] This invention is implemented as follows:

[0007] This invention provides a method for precision control of ultra-large diameter valves in pressurized channels, comprising the following steps:

[0008] S01: Use BIM software to simulate and analyze the construction process, predict problems during valve hoisting and pre-embedding, determine the location and effect after pre-embedding, and process pipe sleeves and valve components.

[0009] S02: Assemble the processed pipe sleeves and valve components;

[0010] S03: Lay out and position the valves to be installed at the construction site;

[0011] S04: Pre-embed the sleeve for installation;

[0012] S05: Adjust the accuracy of the sleeve;

[0013] S06: Install valves;

[0014] S07: Adjust the valve to a higher precision.

[0015] S08: Perform node verification and quality inspection on the valve accuracy and record the results. If the accuracy is not up to standard and the error exceeds 10mm, repeat step S07. If the accuracy is up to standard and the error is less than 10mm, proceed to step S09. The accuracy standard is: the error does not exceed 10mm.

[0016] S09: Conduct on-site cleanup and final acceptance inspection.

[0017] BIM stands for Building Information Modeling, a new tool for architecture, engineering, and civil engineering. The term "Building Information Modeling" was coined by Autodesk to describe computer-aided designs that are primarily based on three-dimensional graphics, object-oriented, and related to architecture.

[0018] Based on the above technical solution, the precision control method for ultra-large diameter valves in pressurized corridors of the present invention can be further improved as follows:

[0019] In step S06, the valve installation method utilizes an alignment device, which includes a first wire, a second wire, a connector, a power supply, a speaker, and a resistor. The first wire has connectors at both ends and the resistor in the middle. The second wire has connectors at both ends and the power supply and speaker in the middle. Both the first and second wires are covered with an insulating layer. The connector of the first wire is inserted into two bolt holes of the flange of the sleeve from the side away from the pipe opening. The connector of the second wire is inserted into two bolt holes of the flange of the valve from the side away from the valve opening. The bolt hole spacing of the valve flange where the connector is inserted is the same as the bolt hole spacing of the sleeve flange where the connector is inserted. The valve is hoisted above the sleeve for alignment. Alignment continues until the speaker emits a sound, indicating that the bolt holes of the valve flange where the connector is inserted are aligned with the bolt holes of the sleeve flange where the connector is inserted, i.e., the sleeve and the valve are aligned. The connector is removed from the bolt holes of the sleeve flange and the valve flange. The sleeve flange and the valve flange are secured with bolts.

[0020] Furthermore, the connector includes a metal post and an insulating sleeve. The metal post is a cylindrical, conductive metal column, and the insulating sleeve is wrapped around the metal post. The insulating sleeve is a rubber sleeve. An adjustable support device is provided outside the insulating sleeve. The support device includes a threaded post and a support washer. The threaded post is symmetrically arranged on the outside of the insulating sleeve, and the support washer is connected to the threaded post through a threaded hole. The thread of the threaded hole of the support washer matches the thread of the threaded post.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By setting a connector, when the connector on the sleeve and the connector on the valve are connected, a speaker will emit a sound to remind the operator that the sleeve and valve are aligned, avoiding the difficulty of accurate alignment by visual inspection due to the excessive diameter of the sleeve and valve; by setting an insulating sleeve, the metal sleeve and valve are prevented from becoming electrified; by setting a support device, the alignment device can be stably supported in the bolt holes of the flange without shaking, and the alignment device can also adapt to bolt holes of different diameters. The alignment device has a simple structure, is easy to use, and can be reused.

[0022] Furthermore, the support device includes a support pad and a spring, the support pad being connected between the spring and the insulating sleeve.

[0023] The method for pre-installing and embedding the sleeve in step S04 is as follows: on the circular layout template of the sleeve, the layout line is divided into three equal parts by three pieces of triangular steel. The triangular steel is fixed to the wooden board with expansion screws for reinforcement. The sleeve is then hoisted and pre-embedded. The triangular steel is then welded to the sleeve as a whole. Next, the ribs are laid. Three pieces of triangular steel with a 120° angle to each of the ribs are welded to the upper part of the ribs. At the same time, jacks are used to support the bottom of the sleeve to ensure the flatness of the sleeve.

[0024] The beneficial effects of adopting the above-mentioned improved scheme are as follows: using ordinary triangular steel and the principle of the stability of triangles to solve the installation of ultra-large diameter valves in pressurized corridors. Since the wave generation and flow generation in deep-water large-span laboratories require extremely high precision with a deviation of no more than 3mm, after the external reinforcement is erected, the principle of triangle stability is used again to form a triangle with three pieces of triangular steel to fix the sleeve and weld it to the reinforcement. Using physical principles to solve practical problems has the advantages of saving materials, controlling costs, and being safe and environmentally friendly.

[0025] In step S02, the component assembly and installation scheme is a split installation, and the installation procedure is as follows:

[0026] Step 1: Install the sleeve;

[0027] Step 2: Install the valve;

[0028] Step 3: Install the extension rod onto the valve;

[0029] Step 4: Weld the extended pipe and the valve.

[0030] Step S03 includes:

[0031] Step 1: Manual layout;

[0032] Step 2: Use a line-laying robot to establish reference points;

[0033] Step 3: Perform mechanical laying out to adjust the manual laying out.

[0034] The beneficial effects of adopting the above-mentioned improved scheme are as follows: Because deep-water, large-span laboratories require extremely high precision in wave-generating and current-generating equipment, a method of manual layout followed by verification by a layout robot was used. Initially, conventional manual layout resulted in significant errors. Later, advanced layout machines were employed, providing reference points for mechanical layout adjustments, thus ensuring accuracy.

[0035] In step S02, when the components arrive at the site, they are checked against the component list, and the product certificate and design documents are verified. When assembling the components, they are assembled according to the pre-assembly record.

[0036] In step S07, manual precision adjustment is performed using an adjustment rod.

[0037] The on-site cleanup in step S09 includes: checking whether the quality of component installation, welding, and anti-corrosion coating meets the specifications and design requirements, and repairing contaminated or damaged components in a timely manner. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention 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.

[0039] Figure 1 A flowchart of a method for precision control of ultra-large diameter valves in pressurized corridors is provided by the present invention;

[0040] Figure 2 This invention provides a schematic diagram of the triangular steel fixing method in a method for controlling the precision of ultra-large diameter valves in pressurized corridors.

[0041] Figure 3 This invention provides a schematic diagram of an alignment device in a method for controlling the precision of ultra-large diameter valves in pressurized corridors.

[0042] Figure 4 This is a schematic diagram of the support device in the first embodiment of the precision control method for ultra-large diameter valves in pressurized corridors provided by the present invention;

[0043] Figure 5 This is a schematic diagram of the support device in the second embodiment of the precision control method for ultra-large diameter valves in pressurized corridors provided by the present invention;

[0044] The attached diagram lists the components represented by each number as follows:

[0045] 101. First wire; 102. Second wire; 20. Connector; 201. Metal post; 202. Insulating sleeve; 203. Threaded post; 204. Support washer; 205. Spring; 30. Power supply; 40. Speaker; 50. Resistor. Detailed Implementation

[0046] 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.

[0047] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0048] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] like Figure 1 The image shown is a first embodiment of a precision control method for ultra-large diameter valves in pressurized corridors provided by the present invention. This embodiment includes the following steps:

[0052] S01: Use BIM software to simulate and analyze the construction process, use BIM software to perform 3D section analysis, analyze and study the section, determine the principle of pre-embedding triangular steel in the formwork and upper reinforcement for fixation, predict problems in the valve hoisting and pre-embedding process, determine the position and effect after pre-embedding, and at the same time process the pipe sleeve and valve components.

[0053] S02: Assemble the processed pipe sleeves and valve components;

[0054] S03: Lay out and position the valves to be installed at the construction site;

[0055] S04: Pre-embed the sleeve for installation;

[0056] S05: Adjust the sleeve accuracy;

[0057] S06: Install valves;

[0058] S07: Adjust the valve for precision;

[0059] S08: Perform node verification and quality inspection on the valve accuracy and record the results. If the accuracy is not up to standard and the error exceeds 10mm, repeat step S07. If the accuracy is up to standard and the error is less than 10mm, proceed to step S09.

[0060] S09: Conduct on-site cleanup and final acceptance inspection.

[0061] After the valve is installed, concrete is poured. During this stage, someone needs to be present to monitor the accuracy and make slight adjustments using a level and a spirit level.

[0062] like Figure 3As shown, in the above technical solution, the alignment device in step S06 includes a first wire 101, a second wire 102, a connector 20, a power supply 30, a speaker 40, and a resistor 50. The first wire 101 has connectors 20 at both ends and a resistor 50 in the middle. The second wire 102 has connectors 20 at both ends and a power supply 30 and the speaker 40 in the middle. Both the first wire 101 and the second wire 102 are covered with an insulating layer. The connector 20 of the first wire 101 is inserted from the side away from the pipe opening into two bolt holes of the flange of the sleeve. The connector 20 of the second wire 102 is inserted into two bolt holes of the valve flange from the side away from the valve port. The bolt hole spacing of the valve flange into which the connector 20 is inserted is the same as the bolt hole spacing of the sleeve flange into which the connector 20 is inserted. The valve is hoisted above the sleeve and aligned. Alignment continues until the speaker 40 emits a sound, indicating that the bolt holes of the valve flange into which the connector 20 is inserted are aligned with the bolt holes of the sleeve flange into which the connector 20 is inserted, i.e., the sleeve and valve are aligned. The connector 20 is removed from the bolt holes of the sleeve flange and the valve flange. The sleeve flange and the valve flange are secured with bolts.

[0063] like Figure 4 As shown, further, in the above technical solution, the connector 20 includes a metal post 201 and an insulating sleeve 202. The metal post 201 is a cylindrical conductive metal post, and the insulating sleeve 202 is wrapped around the metal post 201. The insulating sleeve 202 is a rubber sleeve. An adjustable support device is provided outside the insulating sleeve 202. The support device includes a threaded post 203 and a support washer 204. The threaded post 203 is symmetrically arranged on the outside of the insulating sleeve 202. The support washer 204 is connected to the threaded post 203 through a threaded hole, and the thread of the threaded hole of the support washer 204 matches the thread of the threaded post 203.

[0064] When the casing and valve are aligned, the connector 20 on the casing flange and the connector 20 on the valve flange come into contact, forming a closed circuit, which enables the power supply 30 to power the speaker 40, reminding the operator that the casing and valve are aligned.

[0065] When in use, insert the connector 20 into the bolt hole, rotate the threaded post 203 on the outside of the insulating sleeve 202 to extend the threaded post 203 until it is supported on the inner wall of the bolt hole.

[0066] Among them, resistor 50 can be a 1 / 2W fixed resistor from Shenzhen Xinyuanjie Electronics Co., Ltd.;

[0067] Power supply 30 can use a 21700 lithium battery pack from Shenzhen Oulibao Technology Co., Ltd.;

[0068] The speaker 40 can use JJY-20-02 from Shenzhen Jujiayin Electronics Co., Ltd.

[0069] like Figure 5 The image shows a second embodiment of a precision control method for ultra-large diameter valves in pressurized corridors provided by the present invention. In this embodiment, the support device includes a support pad 204 and a spring 205, with the support pad 204 connected between the spring 205 and the insulating sleeve 202.

[0070] In use, the spring 205 between the compression support gasket 204 and the insulating sleeve 202 is compressed, making the spring 205 shorter. The alignment device is then inserted into the flange bolt hole. When the pressure on the spring 205 decreases, the support gasket 204 is pressed against the inner wall of the bolt hole due to elastic elongation.

[0071] like Figure 2 As shown, in the above technical solution, the method for installing and pre-embedding the sleeve in step S04 is as follows: on the supported circular layout template of the sleeve, the layout line is divided into three equal parts by three pieces of triangular steel. The triangular steel is fixed to the wooden board with expansion screws for reinforcement. The sleeve is hoisted and pre-embedded. Then, the triangular steel and the sleeve are welded together. Next, the rib is laid. Three pieces of triangular steel with a 120° angle to the rib are welded to the top of the rib. At the same time, the bottom of the sleeve is supported by jacks to ensure the flatness of the sleeve.

[0072] The sleeve reinforcement is integrated into one piece by full welding.

[0073] In the above technical solution, the component assembly and installation scheme in step S02 is a split installation, and the installation procedure is as follows:

[0074] Step 1: Install the sleeve;

[0075] Step 2: Install the valves;

[0076] Step 3: Install the extension rod onto the valve;

[0077] Step 4: Weld the extended pipe and valve.

[0078] In the above technical solution, step S03 includes:

[0079] Step 1: Manual layout;

[0080] Step 2: Use a line-laying robot to establish reference points;

[0081] Step 3: Adjust the manual laying out by performing mechanical laying out.

[0082] In the above technical solution, when the components arrive at the site in step S02, they are checked against the component list, and the product certificate and design documents are verified; when assembling the components, they are assembled according to the pre-assembly record.

[0083] In the above technical solution, step S07 involves using an adjustment rod for manual precision adjustment.

[0084] In the above technical solution, the on-site cleaning in step S09 includes: checking whether the quality of component installation, welding, anti-corrosion coating, etc. meets the specifications and design requirements, and repairing contaminated or damaged components in a timely manner.

[0085] When materials and equipment arrive on site, strict control is exercised over the material acceptance process. All incoming materials are inspected according to the samples to verify their brand, model, and specifications, ensuring that all raw and auxiliary materials meet the engineering design requirements and the processing schedule requirements.

[0086] Control the main control points of the project, such as processing drawings, material and node testing, component processing, branch splicing, electric welding, etc., and strengthen the testing personnel in key positions and clarify their responsibilities.

[0087] Before installation, the components arriving on site should be checked against the component list, and the product certificates and design documents should be verified. When assembling pre-assembled components in the factory on site, the assembly should be carried out according to the pre-assembly record.

[0088] After the components arrive on site, a quality inspection should be carried out to confirm whether there is any deformation, damage or missing parts during transportation, and relevant departments should be consulted to handle the matter in a timely manner.

[0089] During installation, check control factors such as length, elevation, center offset, and camber value to ensure that the quality meets the specifications and design requirements.

[0090] In addition to meeting the design requirements, the quality inspection shall comply with the provisions of "Rust Grades and Rust Removal Grades of Steel Surfaces Before Painting" (GB / T8923) and "Code for Acceptance of Construction Quality of Steel Structures" (GB50205).

[0091] Safety control at construction sites shall be carried out in accordance with the "Safety Production Law of the People's Republic of China", "Safety Inspection Standard for Construction" JGJ59, "Safety Technical Regulations for the Use of Construction Machinery" JGJ33, and "Safety Technical Specifications for Temporary Power Supply at Construction Sites" JGJ46.

[0092] Environmental protection control at construction sites shall be carried out in accordance with the Environmental Protection Law of the People's Republic of China, the Law of the People's Republic of China on the Prevention and Control of Environmental Noise Pollution, the Regulations on Environmental Protection Management of Construction Projects, the Evaluation Standard for Green Construction of Building Engineering GB / T50640, and the Emission Standard for Environmental Noise at Construction Site Boundary GB12523.

[0093] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the accuracy of a large-diameter valve in a pressurized gallery, characterized by, Includes the following steps: S01: Use BIM software to simulate and analyze the construction process, predict problems during valve hoisting and pre-embedding, determine the location and effect after pre-embedding, and process sleeves and valve components. S02: Assemble the processed sleeve and valve components; S03: Lay out and position the valves to be installed at the construction site; S04: Pre-embed the sleeve for installation; S05: Adjust the accuracy of the sleeve; S06: Install valves; S07: Adjust the valve to a higher precision. S08: Perform node verification and quality inspection on the valve accuracy and record the results. If the accuracy is not up to standard, repeat step S07. If the accuracy is up to standard, proceed to step S09. The accuracy standard is: the error does not exceed 10mm. S09: Conduct on-site cleanup and final acceptance inspection. In step S06, an alignment device is used to install the valve. This alignment device includes a first wire, a second wire, a connector, a power supply, a speaker, and a resistor. The first wire has connectors at both ends and the resistor in the middle. The second wire has connectors at both ends and the power supply and speaker in the middle. Both the first and second wires are wrapped with an insulating layer. The connector of the first wire is inserted into two bolt holes of the flange of the sleeve from the side away from the pipe opening. The connector of the second wire is inserted into two bolt holes of the flange of the valve from the side away from the valve opening. The bolt hole spacing of the valve flange where the connector is inserted is the same as the bolt hole spacing of the sleeve flange where the connector is inserted. The valve is hoisted above the sleeve for alignment. Alignment continues until the speaker emits a sound, indicating that the bolt holes of the valve flange where the connector is inserted are aligned with the bolt holes of the sleeve flange where the connector is inserted, i.e., the sleeve and the valve are aligned. The connector is removed from the bolt holes of the sleeve flange and the valve flange. The sleeve flange and the valve flange are then secured with bolts. The connector includes a metal post and an insulating sleeve. The metal post is a cylindrical, conductive metal column, and the insulating sleeve is a rubber sleeve that wraps around the metal post. An adjustable support device is provided outside the insulating sleeve. The support device includes a threaded post and a support washer. The threaded post is symmetrically arranged on the outside of the insulating sleeve, and the support washer is connected to the threaded post through a threaded hole. The thread of the threaded hole of the support washer matches the thread of the threaded post.

2. The method for precision control of ultra-large diameter valves in pressurized corridors according to claim 1, characterized in that, The support device includes a support pad and a spring, the support pad being connected between the spring and the insulating sleeve.

3. The method for precision control of ultra-large diameter valves in pressurized corridors according to claim 2, characterized in that, Step S04 involves pre-installing and embedding the sleeve. On the prepared circular template for the sleeve, three triangular steel pieces are used to divide the layout into three equal parts. The triangular steel pieces are then fixed to the wooden board with expansion bolts for reinforcement. The sleeve is then hoisted and pre-embedded. The triangular steel pieces are then welded to the sleeve as a whole. Next, the reinforcing bars are laid. Three triangular steel pieces with a 120° angle to each of the reinforcing bars are welded to the top of the reinforcing bars. At the same time, jacks are used to support the bottom of the sleeve to ensure its flatness.

4. The method for precision control of ultra-large diameter valves in pressurized corridors according to claim 3, characterized in that, The component assembly and installation scheme in step S02 is a modular installation, and the installation procedure is as follows: Step 1: Install the sleeve; Step 2: Install the valve; Step 3: Install the extension pipe onto the valve; Step 4: Weld the extended pipe and the valve.

5. The method for precision control of ultra-large diameter valves in pressurized corridors according to claim 4, characterized in that, Step S03 includes: Step 1: Manual layout; Step 2: Use a line-laying robot to establish reference points; Step 3: Perform mechanical laying out to adjust the manual laying out.

6. The method for precision control of ultra-large diameter valves in pressurized corridors according to claim 5, characterized in that, In step S02, when the components arrive on site, they are checked against the component list, and the product certificate and design documents are verified. When assembling the components, they are assembled according to the pre-assembly record.

7. The method for precision control of ultra-large diameter valves in pressurized corridors according to claim 6, characterized in that, In step S07, manual precision adjustment is performed using an adjustment lever.

8. The method for precision control of ultra-large diameter valves in pressurized corridors according to claim 7, characterized in that, The on-site cleanup in step S09 includes: checking whether the quality of component installation, welding, and anti-corrosion coating meets the specifications and design requirements, and repairing contaminated or damaged components in a timely manner.

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