SY/T 7779-2024 Specification for metallic coating of oil and gas processing equipment English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 7779-2024
Specification for metallic coating of oil and gas processing equipment
油气处理设备金属涂层技术规范
(English Translation)
Issue date: 2024-09-24 Implementation date: 2025-03-24
Issued by National Development and Reform Commission, P.R.C
Contents
1 General provisions
2 Terms
3 Basic requirements
4 Metal coating properties
4.1 Physical properties
4.2Mechanical properties
4.3 Protective properties
5 Coating design
5.1 General requirements
5.2 Metal coating material
5.3 Metal coating process design6Process specification for coating productionand assessment
7 Coating fabrication
7.1 Coating preparation
7.2 Surface treatment.
7.3 Environment requirements
7.4 Coating prefabrication
7.5 Post-processing
7.6 Coating repair
8 Test and detection
8.1 General requirements
8.2 Test and detection range
8.3 Alloy composition analysis
8.4 Checking physical performance
Explanation of wording in this code
List of quoted standards
Addition : Explanation of provisions..
1 General Provisions
1.0.1 This specification is formulated to standardize the requirements for the performance, design, preparation, testing and inspection, acceptance, operation, and maintenance of metallic coatings used on oil and gas processing equipment.
1.0.2 This specification is applicable to metallic coatings with anti-corrosion, anti-erosion, and wear-resistant protective properties used on atmospheric equipment and pressure equipment in the fields of oil and gas exploration and development, production and processing, storage and transportation. Pipelines and pipe fittings may refer to this specification for implementation.
1.0.3 In addition to complying with this specification, metallic coatings used on oil and gas processing equipment (hereinafter referred to as "metallic coatings") shall also comply with the requirements of current relevant national standards and specifications.
2 Terms
2.0.1
metallic coating
A coating where the coating material is metal, applied by cladding onto the surface of the base metal of equipment to separate the equipment base from the environment or working medium, achieving a protective function.
2.0.2
protective properties of coating
Refers primarily to one or more of the corrosion resistance, wear resistance, and erosion resistance possessed by the metallic coating.
2.0.3
primer coating
The coating applied first to the substrate surface to improve the bonding performance between the coating and the substrate.
2.0.4
surface coating
The coating that is in direct contact with the environment or the working medium.
2.0.5
brazing coating
A method where a self-fluxing alloy brazing filler metal is pre-placed on the surface of the metal substrate, and then post-treated at a temperature below the phase transition temperature of the base metal to form a metallic protective coating with a metallurgical bond.
2.0.6
post-coating treatment
A treatment method where the pre-placed coating is heated to within its melting temperature range to achieve a uniform structure and form a diffusion-type metallurgical bond between the coating itself and the substrate.
2.0.7
powder particle size
The size of powder particles, expressed in units of μm (or mesh).
2.0.8
the distribution of particle size
The proportion of powders of different particle sizes within a powder mass, generally conforming to a normal distribution.
2.0.9
apparent density of powders
The weight per unit volume of powder when it is loosely packed without tapping, expressed in units of g/cm³.
2.0.10
flowability of powders
Expressed as the time (in seconds) required for 50g of powder to flow through a standard funnel with an aperture of 2.5mm.
2.0.11
coating process specification (CPS)
Coating preparation process documents that outline the methods and implementation requirements for obtaining qualified metallic coatings, including provisions related to coating preparation activities such as pre-coating preparation, selection of coating materials, coating process design, determination of coating equipment and parameters, operational requirements, and post-treatment. It serves as the basis for coating preparation, product inspection, and quality control.
2.0.12
coating porosity
The ratio of the volume of pores within a metallic coating to the total volume of the coating.
2.0.13
abrasive
Blasting media used to roughen and clean the surface of the substrate.
2.0.14
surface pretreatment
Processes carried out before coating application to remove attachments or foreign substances generated on the substrate surface, in order to improve the adhesion between the substrate surface and the coating.
3 Basic Requirements
3.0.1 The selection of metallic coatings shall be comprehensively determined by professional design personnel based on requirements such as the equipment's operating environment, working medium, process parameters, and design service life, considering aspects like safety, reliability, economy, and practicability.
3.0.2 The equipment design documents shall clearly specify the required protective performance requirements for the metallic coating, such as corrosion resistance, erosion resistance, and wear resistance.
3.0.3 The base material of pressure equipment shall comply with the plates, pipes, and forgings specified in the current national standards Supervision Regulation on Safety Technology for Stationary Pressure Vessel TSG 21 and Pressure Vessels — Part 2: Materials GB/T 150.2, as well as the matching welds or weld cladding; the base material of other equipment shall comply with the material selection requirements specified in the corresponding equipment design standards.
3.0.4 When performing strength calculations for equipment, the thickness of the metallic coating shall not be included in the determination of the base material thickness.
3.0.5 The preparation of metallic coatings shall be supported by appropriate equipment, preparation technology, and inspection methods, as well as quality, health, safety, and environmental management system certifications.
3.0.6 The preparation of metallic coatings shall involve selecting coating materials and designing coating thickness based on the specific structure of the equipment, operating conditions, and design requirements. Implementation shall proceed after formulating a coating preparation plan according to the coating process specification.
3.0.7 Metallic coating materials shall be accompanied by product quality certification documents. Composition verification and trial production of the coating materials shall be conducted before coating preparation.
3.0.8 Requirements for occupational safety and health, labor protection, and environmental protection during the preparation of metallic coatings shall comply with the current national standards Standard for Fire Protection Design of Petrochemical Enterprises GB 50160, Code for Design of Electrical Installations in Explosive Atmospheres GB 50058, Safety Code for Painting — Safety and Ventilation for Paint Coating Process GB/T 6514, Metallic and Other Inorganic Coatings — Thermal Spraying — Safety Precautions GB/T 11375, Hygienic
