Anti-corrosion closed-loop design method for large offshore engineering equipment

Abstract

The present invention discloses a closed-loop anti-corrosion design method for large-scale marine engineering equipment, including: obtaining anti-corrosion implementation objects, which includes dividing large-scale equipment into multiple levels, including overall, system, equipment and components; anti-corrosion index allocation, which includes carrying out corrosion classification of the equipment service environment according to the corrosiveness of the service environment, and formulating qualitative corrosion requirements of corresponding levels; anti-corrosion plan formulation, which includes formulating equipment anti-corrosion plans based on anti-corrosion index requirements and combined with the realization of equipment performance; anti-corrosion performance assessment, which includes assessing whether the existing anti-corrosion plans meet the standards according to the anti-corrosion index requirements; and anti-corrosion inspection, which includes integrating anti-corrosion inspection into the entire process of equipment development to ensure the implementation of anti-corrosion work. By this, the blank of the systematization of anti-corrosion design of large-scale marine engineering equipment can be filled, the current situation of two-skin equipment anti-corrosion design / assessment can be effectively solved, and the equipment anti-corrosion level can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion protection, and in particular to an anti-corrosion closed-loop design method for large-scale marine engineering equipment. Background Art

[0002] With the increasing frequency of ocean exploration activities, some large-scale marine engineering equipment has sprung up. During the service of these large-scale marine engineering equipment, serious corrosion and leakage problems are often exposed, which in turn affects the normal use of the equipment. The reason is that the design of marine engineering equipment often "emphasizes performance and neglects efficiency", and factors such as the adaptability of the equipment to the corrosive environment are not fully considered. The equipment anti-corrosion design is not comprehensive, and insufficient attention is paid to the improvement of intrinsic performance such as anti-corrosion.

[0003] As designers' understanding of the marine environment gradually deepens, the anti-corrosion design work of marine engineering equipment has gradually become systematized, the anti-corrosion requirements have become more and more perfect, and the anti-corrosion performance of various marine engineering products has also been improved year by year. However, in the current anti-corrosion work in the development process of various marine engineering equipment, a type of problem has become increasingly prominent. The main problem is that the qualitative anti-corrosion index requirements are relatively complete, but the quantitative anti-corrosion requirements are not systematic. If the quantitative requirements cannot be proposed, the anti-corrosion assessment cannot be implemented. Some rough overall life indicators are even proposed, but there is no assessment method. Finally, there is a vicious circle of "no quantitative indicator assessment, and the proposed indicators cannot be assessed", which seriously affects the further improvement of the anti-corrosion performance of marine engineering equipment.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a closed-loop anti-corrosion design method for large-scale marine engineering equipment, which can fill the gap in the systematic anti-corrosion design of large-scale marine engineering equipment, effectively solve the current situation of equipment anti-corrosion design / assessment being two separate things, and effectively improve the equipment anti-corrosion level.

[0006] To achieve the above-mentioned purpose, the present invention provides a closed-loop anti-corrosion design method for large-scale marine engineering equipment, comprising: obtaining anti-corrosion implementation objects, which includes dividing large-scale equipment into multiple levels, and the multiple levels include overall, system, equipment and components; anti-corrosion index allocation, which includes grading the corrosion of the equipment service environment according to the corrosiveness of the service environment, and formulating qualitative corrosion requirements of corresponding levels; anti-corrosion plan formulation, which includes formulating equipment anti-corrosion plans based on anti-corrosion index requirements and combined with the realization of equipment performance; anti-corrosion performance assessment, which includes assessing whether the existing anti-corrosion plans meet the standards according to the anti-corrosion index requirements; and anti-corrosion inspection, which includes integrating anti-corrosion inspection into the entire process of equipment development to ensure the implementation of anti-corrosion work.

[0007] In a preferred embodiment, the overall anti-corrosion implementation object is obtained to include multiple systems, each system includes multiple devices and each device includes multiple components, and the anti-corrosion closed-loop design method is combined to finally form an anti-corrosion implementation object list.

[0008] In a preferred embodiment, the allocation of anti-corrosion indicators also includes: taking the life index of the target object as input, further refining and decomposing it into quantitative index requirements of material design index, structural design index and protective measures design index; finally, allocating the above-mentioned anti-corrosion qualitative and quantitative requirements to the anti-corrosion implementation object, thereby realizing the hierarchical management and quantitative control of equipment anti-corrosion indicators.

[0009] In a preferred embodiment, the formulation of the anti-corrosion plan also includes: closed-loop analysis of equipment corrosion weaknesses, material selection design, electrochemical matching design between materials, structural design, and anti-corrosion measures design.

[0010] In a preferred embodiment, the anti-corrosion performance assessment also includes test-type assessment and evaluation-type assessment; the test-type assessment is applied to target objects with large changes in technical status and no parent corrosion data, and requires the use of experimental means to verify whether the anti-corrosion performance meets the standards; the evaluation-type assessment is suitable for target objects with little change in technical status or with a series of corrosion data, and can use a comprehensive evaluation method to judge whether the target object's anti-corrosion indicators meet the standards.

[0011] In a preferred embodiment, test assessments are subdivided into offline assessment tests and online assessment tests; assessment tests are applicable to relatively independent target objects with less corrosion impact on surrounding equipment. Tests on such target objects are further divided into material level, component level or whole machine level, and appropriate level of assessment tests can be selected according to actual conditions; online assessment tests are applicable to system equipment where target objects influence each other, and need to be carried out in conjunction with joint debugging tests on the actual status of the equipment.

[0012] In a preferred embodiment, the anti-corrosion inspection also includes pre-examination, prototype investigation and dragnet inspection; the pre-examination is for the anti-corrosion plan of the equipment, firstly, to check whether the anti-corrosion index requirements fall into the plan, to ensure that the persons responsible for each system equipment are aware of the anti-corrosion index requirements; secondly, to evaluate whether the anti-corrosion risk identification is comprehensive, whether the formulated anti-corrosion plan is reasonable, and whether reasonable and feasible assessment tests are formulated for target objects with large technical changes or no parent corrosion data; the prototype investigation is to check whether the anti-corrosion plan formulated in the early stage falls into the two-dimensional drawings or three-dimensional prototypes of the construction design; the dragnet inspection is to check whether the anti-corrosion plan and process of the key corrosion parts are implemented, to ensure that the anti-corrosion performance meets the standards and the anti-corrosion quality is reliable; and for problems found during the inspection, timely rectification of the problems is required to restore the anti-corrosion performance of the equipment.

[0013] In a preferred embodiment, in the process of acquiring anti-corrosion implementation objects, it is necessary to sort out the service environment of the matching target objects, and finally form a five-level anti-corrosion implementation object list of "overall-system-equipment-component-service environment".

[0014] In a preferred embodiment, the allocation of quantitative anti-corrosion indicators also includes: taking the life index of the target object as input, and subdividing it into material design indicators, structural design indicators, and protective measures design indicators; among which the material system design indicators are quantitative requirements for the matching of materials with the surrounding environment, and are suitable for material selection and design; among which the structural design indicators are based on the determination of the material solution, and propose specific corrosion allowances, flow rate limitations and other indicators to ensure that the physical dimensions of the materials are not exceeded; and among which the protective measures design indicators are the number of years that the corresponding measures can be used.

[0015] In a preferred embodiment, the formulation of the anti-corrosion plan also includes: requiring each equipment and system to carry out the formulation of equipment and system-level anti-corrosion plans, and the overall plan is based on the system and equipment to finally form an overall anti-corrosion plan for the equipment.

[0016] exist

[0017] Compared with the prior art, the anti-corrosion closed-loop design method for large-scale marine engineering equipment of the present invention has the following beneficial effects: (1) With the closed loop as the guiding ideology, a systematic anti-corrosion closed-loop design method for large-scale marine engineering equipment is constructed, which can effectively solve the current situation of two-faced equipment design / assessment, and can drive the high-quality development of equipment corrosion protection technology; (2) Based on the corrosiveness of the corrosion environment, the corrosion grade is divided, and then the target objects are managed in a graded manner, the key objects of corrosion protection are identified, and the precise prevention and control of equipment corrosion is achieved; (3) From the perspective of engineering management, the anti-corrosion inspection is innovatively divided into pre-examination, prototype investigation, and dragnet inspection, which realizes the control of the anti-corrosion performance of the entire equipment development process, and further strengthens the design of equipment anti-corrosion performance standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic flow chart of an anti-corrosion closed-loop design solution according to one embodiment of the present invention.

[0019] Description of main reference numerals:

[0020] 1: Obtain the object of anti-corrosion implementation, 1-1: Object stratification, 1-2: Service environment, 2: Allocation of anti-corrosion indicators, 2-1: Corrosion classification, 2-2: Qualitative requirements, 2-3: Lifespan, 2-4: Quantitative indicators, 3: Development of anti-corrosion plan, 3-1: Development of plan step by step, 3-2: Content requirements, 4: Anti-corrosion performance assessment, 4-1: Test category, 4-2: and evaluation category, 5: Anti-corrosion inspection, 5-1: Pre-examination, 5-2: Prototype inspection, 5-3: Net inspection. DETAILED DESCRIPTION

[0021] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0022] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0023] like Figure 1 As shown, according to a preferred embodiment of the present invention, a closed-loop anti-corrosion design method for large marine engineering equipment is provided. Taking a large ship as an example, the closed-loop anti-corrosion design method for a large ship can be divided into five parts: obtaining the anti-corrosion implementation object 1, allocating anti-corrosion indicators 2, formulating an anti-corrosion plan 3, evaluating anti-corrosion performance 4, and inspecting anti-corrosion 5.

[0024] Obtaining the anti-corrosion implementation object 1 includes: firstly, stratifying the target object 1-1 of the ship, dividing the ship into four levels: overall, system, equipment and components, where the overall ship is the overall, and the following includes multiple systems such as seawater system, cooling water system, etc. Each system contains multiple equipment, and each type of equipment contains multiple components; combined with the specific design plan of the ship, the service environment 1-2 of each component is sorted out to form a five-level anti-corrosion implementation object list of "overall-system-equipment-component-service environment". Taking the seawater pump impeller of the ship's seawater system as an example, as shown in Table 1, the established five-level anti-corrosion implementation object list is "ship-seawater system-seawater pump-impeller-seawater".

[0025] Table 1

[0026] Serial number overall system equipment part Service environment 1 Ships Seawater system Seawater pump impeller seawater … … … … … …

[0027] Anti-corrosion index allocation 2 includes: first, based on the anti-corrosion implementation object list obtained in step 1, screen out the service environment of the ship body, including seawater, marine atmosphere, steam, fresh water, lubricating oil, fuel oil and other service environments, and carry out corrosion classification of the service environment 2-1 according to the corrosion rate of 20# steel in various medium environments. As shown in Table 2, it can be divided into four levels: low corrosion, medium corrosion, high corrosion and very high corrosion, and formulate corresponding qualitative requirements 2-2. For non-electrolyte media such as lubricating oil and fuel, they can be classified as low corrosive, and there is no need to specially consider corrosion protection of target objects in such media; for weak electrolytes such as fresh water and steam, they can be classified as moderately corrosive, and only general protection is required, but attention should be paid to the protection of such media under high flow rate flushing; for strong electrolytes such as seawater and marine atmosphere, they can be classified as highly corrosive, and specific protection should be implemented for target objects in such media, such as combined protection measures such as sacrificial anode + coating; for multiphase media such as seawater / steam, seawater / marine atmosphere with the combined effects of multiple media environments involving strong electrolytes, they can be classified as very corrosive, and key protection should be implemented for target objects in such media, and strict control should be exercised in terms of material technology, material selection, structural design, and protective measures, and necessary corrosion monitoring measures should be implemented to ensure that the corrosion state of the target objects is controllable.

[0028] Table 2

[0029]

[0030] At the same time, with the life 2-3 indicators of the target object as input, it is further refined and decomposed into quantitative indicators 2-4 requirements such as material design indicators, structural design indicators, and protective measures design indicators. The material system design indicators mainly include material corrosion resistance design indicators and material compatibility design indicators. The material corrosion resistance design indicators are mainly the average corrosion rate of the material under typical service conditions should meet the theoretical use requirements. The material compatibility design indicators are mainly the indicator requirements for the compatible use of dissimilar metal materials, including parameters such as potential difference and galvanic current density. The structural design indicators mainly include corrosion allowance design indicators and pipeline network flow rate design indicators. The corrosion allowance design indicator is mainly the corrosion allowance value reserved for the target object, which should match the material corrosion resistance design indicator and corrosion life design indicator. The pipeline network flow rate design indicator stipulates the pipeline network flow rate limit under common working conditions, and clarifies that the corrosion resistance design indicator of the pipeline network material under the corresponding flow rate conditions should match the corrosion life design indicator and corrosion allowance design indicator. The protective measures design indicator is to match the repair level of the ship and carry out matching life setting to ensure the effectiveness of the protective measures during each repair period.

[0031] Finally, based on the qualitative requirements 2-2 and quantitative indicators 2-4 proposed above, corresponding indicators are assigned to the corresponding goals, thereby realizing the hierarchical management and quantitative control of equipment anti-corrosion indicators.

[0032] The formulation of anti-corrosion plan 3 includes: based on the requirements of anti-corrosion indicators and combined with the realization of equipment performance, the formulation of equipment anti-corrosion plan is carried out; it is required that the equipment, system and overall anti-corrosion plan be formulated step by step 3-1. The specific requirements of the anti-corrosion plan 3-2 must include but are not limited to the following contents: closed-loop analysis of equipment corrosion weak links, material selection design, electrochemical matching design between materials, structural design, anti-corrosion measures design, etc.

[0033] The anti-corrosion performance assessment 4 includes: according to the requirements of the anti-corrosion index, assess whether the existing anti-corrosion scheme meets the standard. The assessment is divided into test category 4-1 and evaluation category 4-2. The test category is mainly used for target objects with large changes in technical status and no parent corrosion data. It is necessary to use the means of testing to verify the compliance of the anti-corrosion performance. The evaluation category is suitable for target objects with small changes in technical status or with a series of corrosion data. The compliance of the anti-corrosion index of the target object can be judged by comprehensive evaluation. The test category can be subdivided into offline assessment tests and online assessment tests. The offline test is mainly suitable for relatively independent target objects with less corrosion involvement in surrounding equipment. The tests of this type of target object are further divided into material level, component level, and whole machine level. The appropriate level of assessment test can be selected according to the actual situation. The online test is mainly suitable for system equipment where the target objects affect each other, and it needs to be carried out in combination with the joint commissioning test of the actual status of the equipment. For problems encountered during the anti-corrosion performance assessment 4, it is necessary to feedback to the anti-corrosion plan 3, and iterate in this way until the relevant performance meets the requirements of the anti-corrosion index.

[0034] Anti-corrosion inspection 5 includes: In order to ensure the implementation of anti-corrosion work, anti-corrosion inspection needs to be integrated into the entire process of equipment development. Anti-corrosion inspection work is mainly divided into three categories: pre-review 5-1, prototype inspection 5-2, and net inspection 5-3. The pre-review is mainly aimed at the anti-corrosion plan of the equipment. First, it checks whether the anti-corrosion index requirements fall into the plan to ensure that the responsible persons of each system equipment know the anti-corrosion index requirements. Second, it evaluates whether the anti-corrosion risk identification is comprehensive, whether the anti-corrosion plan is reasonable, and whether reasonable and feasible assessment tests have been formulated for target objects with large technical changes or no parent corrosion data; prototype inspection is mainly to check whether the anti-corrosion plan formulated in the early stage falls into the two-dimensional drawings or three-dimensional prototypes of the construction design; net inspection is mainly to check whether the anti-corrosion plan and process of the key corrosion parts are implemented to ensure that the anti-corrosion performance meets the standards and the anti-corrosion quality is reliable. For problems found during the inspection, timely rectification of the problems is required to restore the anti-corrosion performance of the equipment.

[0035] In summary, the anti-corrosion closed-loop design method for large-scale marine engineering equipment of the present invention has the following advantages:

[0036] (1) With the closed loop as the guiding ideology, a closed loop design method for corrosion protection of large-scale marine engineering equipment was systematically constructed, which can effectively solve the current situation of two-faced equipment design / assessment, and promote the high-quality development of equipment corrosion protection technology;

[0037] (2) Based on the corrosiveness of the corrosive environment, the corrosion level is divided, and then the target objects are managed in a graded manner, the key objects of corrosion protection are identified, and accurate prevention and control of equipment corrosion is achieved;

[0038] (3) From the perspective of engineering management, the anti-corrosion inspection is innovatively divided into pre-inspection, prototype inspection, and dragnet inspection, which enables the control of anti-corrosion performance throughout the entire equipment development process and further strengthens the design of equipment anti-corrosion performance standards.

[0039] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A closed-loop anti-corrosion design method for large-scale marine engineering equipment, characterized in that: include: Obtaining the anti-corrosion implementation object, which includes dividing the large equipment into multiple levels, and the multiple levels include overall, system, equipment and components; Allocation of anti-corrosion indicators, which includes classifying the corrosion of the equipment service environment according to the corrosiveness of the service environment, and formulating qualitative corrosion requirements of the corresponding level; Anti-corrosion plan formulation, which includes the formulation of equipment anti-corrosion plan based on anti-corrosion index requirements and combined with the realization of equipment performance; Anti-corrosion performance assessment, which includes assessing whether the existing anti-corrosion scheme meets the anti-corrosion index requirements; as well as Anti-corrosion inspection, which includes ensuring the implementation of anti-corrosion work, and anti-corrosion inspection needs to be integrated into the entire process of equipment development; The anti-corrosion index allocation also includes: taking the life index of the target object as input, further refining and decomposing it into quantitative index requirements of material design index, structural design index and protective measure design index, and finally, allocating the above-mentioned anti-corrosion qualitative and quantitative requirements to the anti-corrosion implementation object, thereby realizing the hierarchical management and quantitative control of equipment anti-corrosion index; The anti-corrosion plan formulation also includes: closed-loop analysis of equipment corrosion weaknesses, material selection design, electrochemical matching design between materials, structural design, and anti-corrosion measures design; The anti-corrosion performance assessment also includes: Test assessment, which is applied to target objects with large changes in technical status and no parent corrosion data, and requires the use of test methods to verify the compliance of anti-corrosion performance; and Evaluation assessment is suitable for target objects with little change in technical status or with a series of corrosion data. It can use comprehensive evaluation to judge whether the target object's anti-corrosion indicators meet the standards. The anti-corrosion index allocation further includes: taking the life index of the target object as input and subdividing it into material design index, structural design index and protective measure design index; The material design index is the quantitative requirement for the matching between the material and the surrounding environment, which is applicable to the selection and design of materials; The structural design indicators are based on the material scheme, and propose specific corrosion allowance and flow rate limit indicators to ensure that the physical dimensions of the material do not exceed the limit; The design index of protective measures is the number of years that the corresponding measures can be used.

2. The anti-corrosion closed-loop design method for large-scale marine engineering equipment according to claim 1, characterized in that: The overall anti-corrosion implementation objects obtained include multiple systems, each system includes multiple devices and each device includes multiple components, and are combined with the anti-corrosion closed-loop design method to finally form an anti-corrosion implementation object list.

3. The anti-corrosion closed-loop design method for large-scale marine engineering equipment according to claim 1, characterized in that: The test type assessment is subdivided into offline assessment tests and online assessment tests; the offline assessment tests are suitable for relatively independent target objects with less corrosion impact on surrounding equipment. The tests on this type of target objects are further divided into material level, component level or whole machine level, and the appropriate level of assessment test can be selected according to actual conditions; the online assessment test is suitable for system equipment where target objects influence each other, and needs to be carried out in combination with joint debugging tests of the actual status of the equipment.

4. The anti-corrosion closed-loop design method for large-scale marine engineering equipment according to claim 1, characterized in that: The anti-corrosion inspection also includes pre-examination, prototype investigation and dragnet inspection; the pre-examination is for the anti-corrosion plan of the equipment. First, it checks whether the anti-corrosion index requirements fall into the plan to ensure that the responsible persons of each system equipment are aware of the anti-corrosion index requirements; second, it evaluates whether the anti-corrosion risk identification is comprehensive, whether the formulated anti-corrosion plan is reasonable, and whether reasonable and feasible assessment tests are formulated for target objects with large technical changes or no parent corrosion data; the prototype investigation is to check whether the anti-corrosion plan formulated in the early stage falls into the two-dimensional construction design drawings or three-dimensional prototypes; the dragnet inspection is to check whether the anti-corrosion plan and process for key corrosion parts are implemented to ensure that the anti-corrosion performance meets the standards and the anti-corrosion quality is reliable; and for problems found during the inspection, timely rectification of the problems is required to restore the anti-corrosion performance of the equipment.

5. The anti-corrosion closed-loop design method for large-scale marine engineering equipment according to claim 2, characterized in that: In the process of obtaining the anti-corrosion implementation objects, it is necessary to sort out the service environment of the matching target objects, and finally form a five-level anti-corrosion implementation object list of "overall-system-equipment-component-service environment".

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