SY/T 4091-1995 Technical specification for corrosion protection of offshore petroleum engineering
Some standard content:
Technical specification of anticorrosion for petroleumengineering in beach-shallow seaSY/ T 409195
Editor: Liaohe Petroleum Exploration Bureau Survey and Design Institute Approving Department: China National Petroleum and Natural Gas Corporation Petroleum Industry Press
1995 Beijing
General Provisions
Surface Treatment
General Requirements·
Surface Treatment·
Protection after Surface Treatment
4 Covering Layer Protection
General Requirements·
Coating Protection
Sprayed Metal Layer Protection
Plating Layer Protection
Coating Layer Protection
Cathodic Protection
Appendix A
Appendix B
Appendix ℃
General Requirements
Sacrificial Anode Protection
Impressed Current Protection
Coating Corrosion Resistance Rating Standard
(20 ）
(32)
Material properties of commonly used auxiliary anodes and geometric shapes of anode bodies (33)
Explanation of terms used in this specification
Additional explanation
Explanation of clauses of the Technical Specification for Anti-corrosion of Beach and Offshore Petroleum Engineering (34)
(35)
(36)
Documents of China National Petroleum Corporation
(95) CNPC Technical Supervision No. 731
Notice on the approval and release of 26 oil and gas industry standards including "Standard for Investigation Methods of Corrosion and Protection of Steel Pipelines and Storage Tanks"
To all relevant units:
"Standard for Investigation Methods of Corrosion and Protection of Steel Pipelines and Storage Tanks" and other 26 oil and gas industry standards (draft) have been reviewed and approved: they are now approved as oil and gas industry standards and are hereby released. The numbers and names of the various standards are as follows: 1
SY/ T 0087-95
SY/T 0545-1995
SYT 4013-95
SY/T 4041-95
SY/T 4084-95
SY/T 4085-95
Standard for investigation method of corrosion and protection of steel pipelines and storage tanks
Determination of thermal characteristic parameters of wax precipitation in crude oil - Differential scanning calorimetry
Technical standard for polyethylene anticorrosion layer of buried steel pipeline (replaces SY4013--87)
Specification for installation and acceptance of wet steam generators for oil fields (replaces SYJ4041-89)
Technical specification for environmental conditions and loads in coastal areas
Technical specification for oil and gas gathering and transportation in coastal oil fields
SY/T 4086-95
SY/T 4087-95
SY/T 4088-95
SY T 4089-95
SY/ T 409095
SY/T 4091-95
SYT 4092-95
SY/T 4093-95
SY/T 4094—95
SY T 4095-95
SYT 4096-95
SY/T 4097-95
SY#T 4098-95
SY/T 4099
SY/T4100
SY/T 4101-
SYT 4102-95
SY / T 41031995
SY 4104-95
SYT 0088-95
Technical specification for design and construction of pipeline network on beach and sea structures
Technical specification for ventilation and air conditioning of beach and sea petroleum projects Technical specification for water supply and drainage of beach and sea petroleum projects Technical specification for electrical engineering of beach and sea petroleum projects
Technical specification for power generation facilities of Weihai petroleum projects Technical specification for corrosion protection of beach and sea petroleum projects
Technical specification for thermal insulation of beach and sea petroleum projects
Technical specification for selection and installation of cranes on beach and sea petroleum facilities
Technical specification for design and construction of shallow-water steel fixed platform structures
Technical specification for design and construction of shallow-water steel mobile platform structures
Technical specification for wellhead protection of beach and sea oil fields Technical specifications for protective devices Technical specifications for the design and construction of sloping sand and gravel artificial island structures on the beach
Technical specifications for the design and construction of steel-formed concrete artificial island structures on the beach
Technical specifications for the design and construction of beach seawalls
Technical specifications for seawall surveying in Weihai engineering
Technical specifications for geotechnical engineering investigation in the beach
Specifications for the inspection and installation of valves
Welding and acceptance of steel pipelines
Quality inspection and assessment standards for petroleum construction projects Pipeline crossing and spanning projects
Technical standards for cathodic protection of the outer wall of the bottom of steel storage tanks
The above standards shall come into force on June 1, 1996. China National Petroleum Corporation
December 18, 1995
1 General Principles
1.0.1 In order to standardize the anti-corrosion design and construction of steel structures, pipelines, and oil and gas production facilities in offshore oil projects, and to ensure safety, reliability, advanced technology, economical and practical protection of the environment, this specification is specially formulated.
1.0.2 This specification applies to the anti-corrosion design, construction and acceptance of the outer surface of steel structures, pipelines and oil and gas production facilities in offshore oil projects. 1.0.3 The anti-corrosion design and construction of the inner surface of steel structures, pipelines, and oil and gas production facilities in offshore oil projects can refer to the "Standard for Internal Corrosion Control of Steel Pipelines" and "Construction and Acceptance Specifications for Anti-corrosion and Insulation Engineering of Steel Containers"; the anti-corrosion design and construction of reinforced concrete structures in offshore oil projects can refer to the "Corrosion Protection Specifications for Reinforced Concrete Structures in Seaports".
1.0.4 Reference standards:
GB1740-79 Determination of moisture and heat resistance of paint films
GB1764-79 Determination of paint film thickness
GB, / T1766-95 Rating method for paint and varnish coating aging GB1767-79 Determination of weather resistance of paint films GB/T1771-91 Determination of neutral salt spray resistance of paints and varnishes GB1865-80 Determination of paint film aging (artificial acceleration) GB/T4948-85 Sacrificial anodes for aluminum-zinc-steel alloys GB/T4949-85 Chemical analysis method for sacrificial anodes for aluminum-zinc-steel alloys
GB, T4950--85 Sacrificial anodes for zinc-aluminum-cadmium alloys GB/ T 495185
GB/ T 7387-87
GB/ T 778887
Chemical analysis method of zinc-aluminum-lanthanum alloy sacrificial anode Technical conditions for marine reference electrode
General technical requirements for anode screen coatings for ships and marine engineering GBT8923-88 Surface rust grade and rust removal grade of steel before painting GB9793-88 Thermal spraying of zinc and zinc alloy coatings CB9794-88: Test method for thermal spraying of zinc and zinc alloy coatings GB 9795-88
GB 9796$8
GB 11373--89
GB 11375--89
SYJ 7-84
SYI 19
SYJ 20-86
SYJ 36-89
SYJ 43-- 89
Thermal spraying aluminum and aluminum alloy coatings
Test methods for thermal spraying aluminum and aluminum alloy coatingsPretreatment of thermal sprayed metal parts
Safety of thermal spraying operation,wwW.bzxz.Net
Design specification for anti-corrosion engineering of steel pipelines and storage tanksTechnical standard for application of magnesium alloy sacrificial anodes
Technical standard for application of zinc alloy sacrificial anodes
Design specification for forced current cathodic protection of buried steel pipelinesColoring regulations for surface pipelines and equipment in oil and gas fieldsSY 006392
Test method for leak detection of pipeline anticorrosion layer
SY 078-93Inner control standard of steel pipelineSY7T0079-93, Technical standard for external cover layer of coal tar enamel for buried steel pipelines
SYJ 4007-86
SYJ 4047----90
Acceptance specification
Specification for surface treatment of steel materials before painting
Construction and acceptance of epoxy coal tar anticorrosion layer for buried steel pipelineSY/T 4059-93
Construction and acceptance specification for anticorrosion and thermal insulation of steel containersSY/T 480692
Recommended practice for planning, design and construction of offshore fixed platform helicopter airports
JTJ.228-87 Specification for Anti-corrosion of Reinforced Concrete Structures in Seaports 1.0.5 In addition to implementing this specification, the anti-corrosion design, construction and acceptance of offshore oil projects shall also comply with the provisions of relevant national standards (specifications). 2.0.1 Anti-corrosion design
2 General provisions
2.0.1.1 The anti-corrosion design of offshore oil projects must be completed by a design unit with anti-corrosion design qualifications and shall comply with relevant national laws, regulations, standards (specifications).
2.0.1.2 The outer surfaces of steel structures, pipelines, and oil and gas production facilities in the atmospheric zone, splash zone, full immersion zone, and beach zone shall be designed for anti-corrosion respectively. The anti-corrosion measures adopted shall meet the use requirements and be coordinated with other measures such as insulation. 2.0.1.3 The reinforcement corrosion in the atmospheric zone shall be protected by coating or spraying metal layer. When the structure shape is complex, plating protection can be used. 2.0.1.4 The anti-corrosion of the splash zone shall be protected by coating. Spray metal layer protection or plating protection, if necessary, can be coated with organic composite layer, resin mortar, concrete or alloy anti-corrosion spraying to strengthen protection
2.0.1.5 The anti-corrosion of the gold immersion area should adopt cathodic protection and coating combined protection or cathodic protection alone. When cathodic protection is used alone. Anti-corrosion measures during the construction period should be considered
2.0.1.6 The anti-corrosion of the tidal flat area should adopt cathodic protection and coating combined protection. 2.0.2 Anti-corrosion construction
2.0.2.1 The anti-corrosion construction of various steel structures, pipelines, and oil and gas production facilities in the beach and offshore petroleum engineering should be completed by a construction unit with anti-corrosion construction qualifications. 2.0.2.2 The equipment and materials used in the anti-corrosion project must be actually applied or verified by relevant tests, and have a factory quality certificate or quality inspection report. If necessary, quality re-inspection should be carried out.
2.0.2.3 The quality inspection of anti-corrosion construction should be carried out by inspectors who are familiar with relevant standards (specifications).
Anti-corrosion construction should have safety precautions
Anti-corrosion project acceptance
Anti-corrosion projects shall not be delivered for production and use without acceptance. The acceptance data of anti-corrosion projects should be accurate and complete. 2.0.3.2
When the construction quality does not meet the requirements of the design and this specification, it should be repaired and accepted only after meeting the requirements. The repair record shall be included in the acceptance documents. 2.0.4
Requirements for structural design of anti-corrosion
Reduce the steel surface area exposed to atmospheric pollution. The structural design should be easy to 2.0.4.1
Anti-corrosion construction.
The surface area of steel in the splash zone should be reduced. T-type, 'K" or Y" cross-connection methods should not be used in the splash zone, and coal joints should be avoided. 2.0.4.3
The structural design of the full immersion area should be conducive to the implementation of anti-corrosion measures. Continuous joints should be used when combining metal components. 3 Surface treatment
3.1 General requirements
3.1.1 Various steel structures, pipelines, and oil and gas production facilities must be surface treated before implementing cover layer protection: Cover layer construction can only be carried out when the surface treatment meets the required indicators.
3.1.2 The rust removal quality requirements for steel surface spraying or projectile rust removal (Sa), manual and power tool rust removal (St), and flame rust removal (FI) should comply with the provisions of "Surface Rust Grade and Rust Removal Grade of Steel before Painting". The rust removal quality requirements for chemical rust removal (Be) are: the steel surface should be free of visible grease and oil stains. The scale that has not been completely removed by pickling, the individual residual points of rust and paint coating can be removed by manual or mechanical methods, but the surface will eventually reveal the original metal appearance without re-rusting. 3.1.3 The surface roughness achieved by the spray (blasting) rust removal quality level should meet the design requirements.
3.1.4 The surface of the main steel structure of important projects, oil and gas production facilities, etc. should not be treated with conversion, stabilization and penetration chemical treatment agents. 3.1.5 The surface treatment level of key steel structures, pipelines, and oil and gas production facilities that are difficult to repair and are highly corroded can be increased by one level according to actual conditions. The minimum level requirements for surface treatment of different coatings should comply with the provisions of Table 3.1,5. Minimum level of surface treatment for different coatings
Coating types
Inorganic zinc-plated paint
Phenolic resin paint, epoxy asphalt paint
Alkyd resin paint
Other paints
Oil-based paint
Maximum level of surface treatment
Rust removal by spraying or blasting
Table 3, 1.5
Rust removal by engineering and power engineering
Not allowed
Not allowed
3.1.6 The minimum level of surface treatment for the metal layer to be sprayed should be Sa not less than 60mm,
Minimum roughness
3.1.7 Safety protection facilities should be provided during the surface treatment process, and attention should be paid to environmental protection.
3.2 Surface treatment
Surface cleaning
3.2.1.1 Before rust removal on the steel surface, the corresponding surface cleaning method should be adopted according to the nature of the pollutants, the degree of pollution, and the shape and size of the rust removal object. 2.2 Before cleaning the old surface, the exposed steel surface, burrs, welding spatter, etc. should be cleaned.
3.2.1.3 Surface cleaning should remove all visible oil, grease, ash, lubricants and other soluble contaminants on the steel surface.
3.2.1.4 The methods and requirements for surface cleaning should comply with the provisions of the "Specifications for Surface Treatment of Steel Materials Before Painting". The applicable ranges of various cleaning methods are shown in Table 3.2.1. Applicable scope of various cleaning methods Cleaning methods Cleaning agents (industrial gasoline, gasoline: permethrin, trichloroethane, etc.) cleaning Alkaline cleaning agent cleaning Emulsion cleaning Gasoline degreasing, when dissolving Trichloroethane: dichloroethane Applicable scope Oil, grease soluble dirt and soluble coating Remove the saponified layer, oil, grease and dirt Degreasing, grease and other dirt Degreasing , grease and other dirt
When the temperature is sufficient, the heat-resistant coating can also be removed
Note: When cleaning, pay special attention to the gaps and rivets in the bottom. Table 3.2.1
If the old coating needs to be restored, the coating should be fully rinsed with solvents, latex and rags that are free of them. The belt should be replaced
After cleaning, the coating should be fully rinsed and passivated
After cleaning, the residue should be rinsed off the steel surface
The coating may be corroded and damaged during cleaning. The cleaning piece will flush the residue off the surface. 3.2.2 Rust removal on the surface 3.2.2.1 Rust removal of tools, spraying (blasting) rust removal and pickling should comply with the provisions of the "Specifications for Steel Surface Treatment Before Painting". 3.2.2.2 Surface rust removal should be carried out by spraying (blasting). The compressed air used by the dry spraying device should be dry and clean: it should not contain moisture and oil. The method for checking the cleanliness of compressed air is: put a white cloth or a white paint target plate in the compressed air flow for one minute, and its surface should be free of oil, water and other pollution when observed by the naked eye. When the surface temperature of the steel is 3°C below the dew point or the relative humidity is higher than 85%, spraying rust removal shall not be carried out. Each process of chemical treatment should be carried out continuously: no pause is allowed. 3.3 Protection after surface treatment
The treated steel surface should be coated with a primer in time (not more than 6 hours). 3.3.1
The surface temperature of the steel should be 3℃ higher than the dew point temperature, otherwise measures must be taken. When the treated steel surface is contaminated again: it should be re-treated. 3.3.35 The corrosion protection of the gold immersion area should adopt the combination of cathodic protection and coating protection or cathodic protection alone. When cathodic protection is used alone. Anti-corrosion measures during the construction period should be considered
2.0.1.6 The corrosion protection of the tidal flat area should adopt the combination of cathodic protection and coating protection. 2.0.2 Anti-corrosion construction
2.0.2.1 The anti-corrosion construction of various steel structures, pipelines, and oil and gas production facilities in the beach and offshore petroleum engineering should be completed by a construction unit with anti-corrosion construction qualifications. 2.0.2.2 The equipment and materials used in the anti-corrosion project must be practically applied or verified by relevant tests, and have a factory quality certificate or quality inspection report. If necessary, quality re-inspection should be carried out.
2.0.2.3 The quality inspection of anti-corrosion construction should be carried out by inspectors who are familiar with relevant standards (specifications).
Anti-corrosion construction should have safety precautions
Anti-corrosion project acceptance
Anti-corrosion projects shall not be delivered for production and use without acceptance. The acceptance data of anti-corrosion projects should be accurate and complete. 2.0.3.2
When the construction quality does not meet the requirements of the design and this specification, it should be repaired and accepted only after meeting the requirements. The repair record shall be included in the acceptance documents. 2.0.4
Requirements for structural design of anti-corrosion
Reduce the steel surface area exposed to atmospheric pollution. The structural design should be easy to 2.0.4.1
Anti-corrosion construction.
The surface area of steel in the splash zone should be reduced. T-type, 'K" or Y" cross-connection methods should not be used in the splash zone, and coal joints should be avoided. 2.0.4.3
The structural design of the full immersion area should be conducive to the implementation of anti-corrosion measures. Continuous joints should be used when combining metal components. 3 Surface treatment
3.1 General requirements
3.1.1 Various steel structures, pipelines, and oil and gas production facilities must be surface treated before implementing cover layer protection: Cover layer construction can only be carried out when the surface treatment meets the required indicators.
3.1.2 The rust removal quality requirements for steel surface spraying or projectile rust removal (Sa), manual and power tool rust removal (St), and flame rust removal (FI) should comply with the provisions of "Surface Rust Grade and Rust Removal Grade of Steel before Painting". The rust removal quality requirements for chemical rust removal (Be) are: the steel surface should be free of visible grease and oil stains. The scale that has not been completely removed by pickling, the individual residual points of rust and paint coating can be removed by manual or mechanical methods, but the surface will eventually reveal the original metal appearance without re-rusting. 3.1.3 The surface roughness achieved by the spray (blasting) rust removal quality level should meet the design requirements.
3.1.4 The surface of the main steel structure of important projects, oil and gas production facilities, etc. should not be treated with conversion, stabilization and penetration chemical treatment agents. 3.1.5 The surface treatment level of key steel structures, pipelines, and oil and gas production facilities that are difficult to repair and are highly corroded can be increased by one level according to actual conditions. The minimum level requirements for surface treatment of different coatings should comply with the provisions of Table 3.1,5. Minimum level of surface treatment for different coatings
Coating types
Inorganic zinc-plated paint
Phenolic resin paint, epoxy asphalt paint
Alkyd resin paint
Other paints
Oil-based paint
Maximum level of surface treatment
Rust removal by spraying or blasting
Table 3, 1.5
Rust removal by engineering and power engineering
Not allowed
Not allowed
3.1.6 The minimum level of surface treatment for the metal layer to be sprayed should be Sa not less than 60mm,
Minimum roughness
3.1.7 Safety protection facilities should be provided during the surface treatment process, and attention should be paid to environmental protection.
3.2 Surface treatment
Surface cleaning
3.2.1.1 Before rust removal on the steel surface, the corresponding surface cleaning method should be adopted according to the nature of the pollutants, the degree of pollution, and the shape and size of the rust removal object. 2.2 Before cleaning the old surface, the exposed steel surface, burrs, welding spatter, etc. should be cleaned.
3.2.1.3 Surface cleaning should remove all visible oil, grease, ash, lubricants and other soluble contaminants on the steel surface.
3.2.1.4 The methods and requirements for surface cleaning should comply with the provisions of the "Specifications for Surface Treatment of Steel Materials Before Painting". The applicable ranges of various cleaning methods are shown in Table 3.2.1. Applicable scope of various cleaning methods Cleaning methods Cleaning agents (industrial gasoline, gasoline: permethrin, trichloroethane, etc.) cleaning Alkaline cleaning agent cleaning Emulsion cleaning Gasoline degreasing, when dissolving Trichloroethane: dichloroethane Applicable scope Oil, grease soluble dirt and soluble coating Remove the saponified layer, oil, grease and dirt Degreasing, grease and other dirt Degreasing , grease and other dirt
When the temperature is sufficient, the heat-resistant coating can also be removed
Note: When cleaning, pay special attention to the gaps and rivets in the bottom. Table 3.2.1
If the old coating needs to be restored, the coating should be fully rinsed with solvents, latex and rags that are free of them. The belt should be replaced
After cleaning, the coating should be fully rinsed and passivated
After cleaning, the residue should be rinsed off the steel surface
The coating may be corroded and damaged during cleaning. The cleaning piece will flush the residue off the surface. 3.2.2 Rust removal on the surface 3.2.2.1 Rust removal of tools, spraying (blasting) rust removal and pickling should comply with the provisions of the "Specifications for Steel Surface Treatment Before Painting". 3.2.2.2 Surface rust removal should be carried out by spraying (blasting). The compressed air used by the dry spraying device should be dry and clean: it should not contain moisture and oil. The method for checking the cleanliness of compressed air is: put a white cloth or a white paint target plate in the compressed air flow for one minute, and its surface should be free of oil, water and other pollution when observed by the naked eye. When the surface temperature of the steel is 3°C below the dew point or the relative humidity is higher than 85%, spraying rust removal shall not be carried out. Each process of chemical treatment should be carried out continuously: no pause is allowed. 3.3 Protection after surface treatment
The treated steel surface should be coated with a primer in time (not more than 6 hours). 3.3.1
The surface temperature of the steel should be 3℃ higher than the dew point temperature, otherwise measures must be taken. When the treated steel surface is contaminated again: it should be re-treated. 3.3.35 The corrosion protection of the gold immersion area should adopt the combination of cathodic protection and coating protection or cathodic protection alone. When cathodic protection is used alone. Anti-corrosion measures during the construction period should be considered
2.0.1.6 The corrosion protection of the tidal flat area should adopt the combination of cathodic protection and coating protection. 2.0.2 Anti-corrosion construction
2.0.2.1 The anti-corrosion construction of various steel structures, pipelines, and oil and gas production facilities in the beach and offshore petroleum engineering should be completed by a construction unit with anti-corrosion construction qualifications. 2.0.2.2 The equipment and materials used in the anti-corrosion project must be practically applied or verified by relevant tests, and have a factory quality certificate or quality inspection report. If necessary, quality re-inspection should be carried out.
2.0.2.3 The quality inspection of anti-corrosion construction should be carried out by inspectors who are familiar with relevant standards (specifications).
Anti-corrosion construction should have safety precautions
Anti-corrosion project acceptance
Anti-corrosion projects shall not be delivered for production and use without acceptance. The acceptance data of anti-corrosion projects should be accurate and complete. 2.0.3.2
When the construction quality does not meet the requirements of the design and this specification, it should be repaired and accepted only after meeting the requirements. The repair record shall be included in the acceptance documents. 2.0.4
Requirements for structural design of anti-corrosion
Reduce the steel surface area exposed to atmospheric pollution. The structural design should be easy to 2.0.4.1
Anti-corrosion construction.
The surface area of steel in the splash zone should be reduced. T-type, 'K" or Y" cross-connection methods should not be used in the splash zone, and coal joints should be avoided. 2.0.4.3
The structural design of the full immersion area should be conducive to the implementation of anti-corrosion measures. Continuous joints should be used when combining metal components. 3 Surface treatment
3.1 General requirements
3.1.1 Various steel structures, pipelines, and oil and gas production facilities must be surface treated before implementing cover layer protection: Cover layer construction can only be carried out when the surface treatment meets the required indicators.
3.1.2 The rust removal quality requirements for steel surface spraying or projectile rust removal (Sa), manual and power tool rust removal (St), and flame rust removal (FI) should comply with the provisions of "Surface Rust Grade and Rust Removal Grade of Steel before Painting". The rust removal quality requirements for chemical rust removal (Be) are: the steel surface should be free of visible grease and oil stains. The scale that has not been completely removed by pickling, the individual residual points of rust and paint coating can be removed by manual or mechanical methods, but the surface will eventually reveal the original metal appearance without re-rusting. 3.1.3 The surface roughness achieved by the spray (blasting) rust removal quality level should meet the design requirements.
3.1.4 The surface of the main steel structure of important projects, oil and gas production facilities, etc. should not be treated with conversion, stabilization and penetration chemical treatment agents. 3.1.5 The surface treatment level of key steel structures, pipelines, and oil and gas production facilities that are difficult to repair and are highly corroded can be increased by one level according to actual conditions. The minimum level requirements for surface treatment of different coatings should comply with the provisions of Table 3.1,5. Minimum level of surface treatment for different coatings
Coating types
Inorganic zinc-plated paint
Phenolic resin paint, epoxy asphalt paint
Alkyd resin paint
Other paints
Oil-based paint
Maximum level of surface treatment
Rust removal by spraying or blasting
Table 3, 1.5
Rust removal by engineering and power engineering
Not allowed
Not allowed
3.1.6 The minimum level of surface treatment for the metal layer to be sprayed should be Sa not less than 60mm,
Minimum roughness
3.1.7 Safety protection facilities should be provided during the surface treatment process, and attention should be paid to environmental protection.
3.2 Surface treatment
Surface cleaning
3.2.1.1 Before rust removal on the steel surface, the corresponding surface cleaning method should be adopted according to the nature of the pollutants, the degree of pollution, and the shape and size of the rust removal object. 2.2 Before cleaning the old surface, the exposed steel surface, burrs, welding spatter, etc. should be cleaned.
3.2.1.3 Surface cleaning should remove all visible oil, grease, ash, lubricants and other soluble contaminants on the steel surface.
3.2.1.4 The methods and requirements for surface cleaning should comply with the provisions of the "Specifications for Surface Treatment of Steel Materials Before Painting". The applicable ranges of various cleaning methods are shown in Table 3.2.1. Applicable scope of various cleaning methods Cleaning methods Cleaning agents (industrial gasoline, gasoline: permethrin, trichloroethane, etc.) cleaning Alkaline cleaning agent cleaning Emulsion cleaning Gasoline degreasing, when dissolving Trichloroethane: dichloroethane Applicable scope Oil, grease soluble dirt and soluble coating Remove the saponified layer, oil, grease and dirt Degreasing, grease and other dirt Degreasing , grease and other dirt
When the temperature is sufficient, the heat-resistant coating can also be removed
Note: When cleaning, pay special attention to the gaps and rivets in the bottom. Table 3.2.1
If the old coating needs to be restored, the coating should be fully rinsed with solvents, latex and rags that are free of them. The belt should be replaced
After cleaning, the coating should be fully rinsed and passivated
After cleaning, the residue should be rinsed off the steel surface
The coating may be corroded and damaged during cleaning. The cleaning piece will flush the residue off the surface. 3.2.2 Rust removal on the surface 3.2.2.1 Rust removal of tools, spraying (blasting) rust removal and pickling should comply with the provisions of the "Specifications for Steel Surface Treatment Before Painting". 3.2.2.2 Surface rust removal should be carried out by spraying (blasting). The compressed air used by the dry spraying device should be dry and clean: it should not contain moisture and oil. The method for checking the cleanliness of compressed air is: put a white cloth or a white paint target plate in the compressed air flow for one minute, and its surface should be free of oil, water and other pollution when observed by the naked eye. When the surface temperature of the steel is 3°C below the dew point or the relative humidity is higher than 85%, spraying rust removal shall not be carried out. Each process of chemical treatment should be carried out continuously: no pause is allowed. 3.3 Protection after surface treatment
The treated steel surface should be coated with a primer in time (not more than 6 hours). 3.3.1
The surface temperature of the steel should be 3℃ higher than the dew point temperature, otherwise measures must be taken. When the treated steel surface is contaminated again: it should be re-treated. 3.3.32 The rust removal quality requirements of steel surface spraying or blasting (Sa), manual and power tool rust removal (St), and flame rust removal (FI) shall comply with the provisions of "Surface Rust Grade and Rust Removal Grade of Steel before Painting". The rust removal quality requirements of chemical rust removal (Be) are: the steel surface should be free of visible grease and oil stains. The scale that has not been completely removed by pickling, individual residual points of rust and paint coating can be removed by manual or mechanical methods, but the surface will eventually reveal the original metal appearance without re-rusting. 3.1.3 The surface roughness achieved by the rust removal quality grade of spraying (blasting) should meet the design requirements.
3.1.4 The surface of the main steel structure of important projects, oil and gas production facilities, etc. should not be treated with conversion, stabilization and penetration chemical treatment agents. 3.1.5 The surface treatment grade of key steel structures, pipelines, and oil and gas production facilities that are difficult to repair and are highly corroded can be increased by one level according to actual conditions. The minimum level of surface treatment for different coatings shall comply with the provisions of Table 3.1,5. Minimum level of surface treatment for different coatings
Coating types
Inorganic zinc paint
Phenolic resin paint, epoxy asphalt paint
Alkyd resin paint
Other paints
Oil-based paint
Maximum level of surface treatment
Rust removal by spraying or blasting
Table 3,1.5
Rust removal by engineering and power engineering
Not allowed
Not allowed
3.1.6 The minimum level of surface treatment for the metal layer during spraying shall be Sa not less than 60mm,
Precision precision
3.1.7 Safety protection facilities shall be provided during surface treatment, and attention shall be paid to environmental protection.
3.2 Surface treatment
Surface cleaning
3.2.1.1 Before rust removal on the steel surface, the corresponding surface cleaning method should be adopted according to the nature of the pollutants, the degree of pollution, and the shape and size of the rust removal object. 2.2 Before cleaning the old surface, the exposed steel surface, burrs, welding spatter, etc. should be cleaned.
3.2.1.3 Surface cleaning should remove all visible oil, grease, ash, lubricants and other soluble contaminants on the steel surface.
3.2.1.4 The methods and requirements for surface cleaning should comply with the provisions of the "Specifications for Surface Treatment of Steel Materials Before Painting". The applicable ranges of various cleaning methods are shown in Table 3.2.1. Applicable scope of various cleaning methods Cleaning methods Cleaning agents (industrial gasoline, gasoline: permethrin, trichloroethane, etc.) cleaning Alkaline cleaning agent cleaning Emulsion cleaning Gasoline degreasing, when dissolving Trichloroethane: dichloroethane Applicable scope Oil, grease soluble dirt and soluble coating Remove the saponified layer, oil, grease and dirt Degreasing, grease and other dirt Degreasing , grease and other dirt
When the temperature is sufficient, the heat-resistant coating can also be removed
Note: When cleaning, pay special attention to the gaps and rivets in the bottom. Table 3.2.1
If the old coating needs to be restored, the coating should be fully rinsed with solvents, latex and rags that are free of them. The belt should be replaced
After cleaning, the coating should be fully rinsed and passivated
After cleaning, the residue should be rinsed off the steel surface
The coating may be corroded and damaged during cleaning. The cleaning piece will flush the residue off the surface. 3.2.2 Rust removal on the surface 3.2.2.1 Rust removal of tools, spraying (blasting) rust removal and pickling should comply with the provisions of the "Specifications for Steel Surface Treatment Before Painting". 3.2.2.2 Surface rust removal should be carried out by spraying (blasting). The compressed air used by the dry spraying device should be dry and clean: it should not contain moisture and oil. The method for checking the cleanliness of compressed air is: put a white cloth or a white paint target plate in the compressed air flow for one minute, and its surface should be free of oil, water and other pollution when observed by the naked eye. When the surface temperature of the steel is 3°C below the dew point or the relative humidity is higher than 85%, spraying rust removal shall not be carried out. Each process of chemical treatment should be carried out continuously: no pause is allowed. 3.3 Protection after surface treatment
The treated steel surface should be coated with a primer in time (not more than 6 hours). 3.3.1
The surface temperature of the steel should be 3℃ higher than the dew point temperature, otherwise measures must be taken. When the treated steel surface is contaminated again: it should be re-treated. 3.3.32 The rust removal quality requirements of steel surface spraying or blasting (Sa), manual and power tool rust removal (St), and flame rust removal (FI) shall comply with the provisions of "Surface Rust Grade and Rust Removal Grade of Steel before Painting". The rust removal quality requirements of chemical rust removal (Be) are: the steel surface should be free of visible grease and oil stains. The scale that has not been completely removed by pickling, individual residual points of rust and paint coating can be removed by manual or mechanical methods, but the surface will eventually reveal the original metal appearance without re-rusting. 3.1.3 The surface roughness achieved by the rust removal quality grade of spraying (blasting) should meet the design requirements.
3.1.4 The surface of the main steel structure of important projects, oil and gas production facilities, etc. should not be treated with conversion, stabilization and penetration chemical treatment agents. 3.1.5 The surface treatment grade of key steel structures, pipelines, and oil and gas production facilities that are difficult to repair and are highly corroded can be increased by one level according to actual conditions. The minimum level of surface treatment for different coatings shall comply with the provisions of Table 3.1,5. Minimum level of surface treatment for different coatings
Coating types
Inorganic zinc paint
Phenolic resin paint, epoxy asphalt paint
Alkyd resin paint
Other paints
Oil-based paint
Maximum level of surface treatment
Rust removal by spraying or blasting
Table 3,1.5
Rust removal by engineering and power engineering
Not allowed
Not allowed
3.1.6 The minimum level of surface treatment for the metal layer during spraying shall be Sa not less than 60mm,
Precision precision
3.1.7 Safety protection facilities shall be provided during surface treatment, and attention shall be paid to environmental protection.
3.2 Surface treatment
Surface cleaning
3.2.1.1 Before rust removal on the steel surface, the corresponding surface cleaning method should be adopted according to the nature of the pollutants, the degree of pollution, and the shape and size of the rust removal object. 2.2 Before cleaning the old surface, the exposed steel surface, burrs, welding spatter, etc. should be cleaned.
3.2.1.3 Surface cleaning should remove all visible oil, grease, ash, lubricants and other soluble contaminants on the steel surface.
3.2.1.4 The methods and requirements for surface cleaning should comply with the provisions of the "Specifications for Surface Treatment of Steel Materials Before Painting". The applicable ranges of various cleaning methods are shown in Table 3.2.1. Applicable scope of various cleaning methods Cleaning methods Cleaning agents (industrial gasoline, gasoline: permethrin, trichloroethane, etc.) cleaning Alkaline cleaning agent cleaning Emulsion cleaning Gasoline degreasing, when dissolving Trichloroethane: dichloroethane Applicable scope Oil, grease soluble dirt and soluble coating Remove the saponified layer, oil, grease and dirt Degreasing, grease and other dirt Degreasing , grease and other dirt
When the temperature is sufficient, the heat-resistant coating can also be removed
Note: When cleaning, pay special attention to the gaps and rivets in the bottom. Table 3.2.1
If the old coating needs to be restored, the coating should be fully rinsed with solvents, latex and rags that are free of them. The belt should be replaced
After cleaning, the coating should be fully rinsed and passivated
After cleaning, the residue should be rinsed off the steel surface
The coating may be corroded and damaged during cleaning. The cleaning piece will flush the residue off the surface. 3.2.2 Rust removal on the surface 3.2.2.1 Rust removal of tools, spraying (blasting) rust removal and pickling should comply with the provisions of the "Specifications for Steel Surface Treatment Before Painting". 3.2.2.2 Surface rust removal should be carried out by spraying (blasting). The compressed air used by the dry spraying device should be dry and clean: it should not contain moisture and oil. The method for checking the cleanliness of compressed air is: put a white cloth or a white paint target plate in the compressed air flow for one minute, and its surface should be free of oil, water and other pollution when observed by the naked eye. When the surface temperature of the steel is 3°C below the dew point or the relative humidity is higher than 85%, spraying rust removal shall not be carried out. Each process of chemical treatment should be carried out continuously: no pause is allowed. 3.3 Protection after surface treatment
The treated steel surface should be coated with a primer in time (not more than 6 hours). 3.3.1
The surface temperature of the steel should be 3℃ higher than the dew point temperature, otherwise measures must be taken. When the treated steel surface is contaminated again: it should be re-treated. 3.3.31
The surface temperature of the steel should be at least 3°C higher than the dew point temperature, otherwise measures must be taken. If the treated steel surface is contaminated again: it should be treated again. 3.3.31
The surface temperature of the steel should be at least 3°C higher than the dew point temperature, otherwise measures must be taken. If the treated steel surface is contaminated again: it should be treated again. 3.3.3
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