Some standard content:
Industry Standard of the People's Republic of China
C/T 20587 96
Design Specification for Chemical Building Coating
Specialafion for.coating designchemieal
findustrial
20910 Issued
1997-01-01
The Ministry of Chemical Industry of the People's Republic of China Issued the Quasi
Ministry of Chemical Industry Document
Chemical Construction Development (1996) No. 634
Notice on the Issuance of Six Industry Standards Including "Regulations on the Design of Chemical Buildings and Coatings"
To all provincial, autonomous region, municipality directly under the Central Government, and independently planned cities, and all relevant design units:
The six standards including "Regulations on the Design of Chemical Buildings and Coatings" organized by the Architectural Design Technology Center of the Ministry of Chemical Industry and edited by China Chengda Chemical Engineering Company have been reviewed and approved as recommended industry standards. The names and numbers of the standards are detailed in the attached table and will be implemented from January 1, 997.
This regulation is managed by the Architectural Design Technology Center of the Ministry of Chemical Industry and published and distributed by the Engineering Construction Standard Editing Center of the Ministry of Chemical Industry. Ministry of Chemical Industry
September 10, 1996
96--81912 /0H
96219 /0
96-1119
96-0912
9688902
:
Industry Standard of the People's Republic of China
Design Regulations for Chemical Building Coating
HG/T 20587-96
Editor: China Chengda Chemical Engineering Company Approval department: Ministry of Chemical Industry Implementation date: January 1997 Engineering Construction Standard Editing Center of Ministry of Chemical Industrywww.bzxz.net
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Base Requirements
Fireproof Coating
5. Anti-corrosion Coating
5.1 Design Regulations
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E| |tt||Primer selection
Coating selection and matching
Subject list
Rust removal level of steel surface
Technical performance of fire-retardant coating
Examples of matching fire-retardant coating
Examples of matching anti-corrosion coating
Terms used in this regulation
Articles
(3)
(5)
1.0.1 These regulations are formulated to ensure the design quality of protective coatings for chemical buildings. 1.0.2 These regulations apply to the coating design of components and fittings of chemical production buildings and structures that use coatings for fire or corrosion protection. 1.0.2.1 Fire-retardant coating design applies to the surface protection of the following components and fittings: (1) Steel components or prestressed concrete components that need to improve the fire resistance limit but are not suitable for fire protection with concrete or mortar materials; (2) Combustible decorative materials that need to improve fire resistance. ：1.0.2.2 Anti-corrosion coating design is applicable to the surface protection of the following components or parts:
(1) Upper building structure components subject to corrosive media such as gas or dust; (2) Foundations, floors, wall skirts, tanks, etc. subject to corrosive liquids or solids. 1.0.3 Anti-corrosion coatings should be selected from the varieties listed in these regulations. If coatings other than those specified are selected, they should be identified by the relevant departments and have good performance proven by engineering practice. Fire-retardant coatings must be products that have been identified as qualified by the national designated monitoring agency and have provincial production licenses.
1.0.4 Chemical building coating design should include: coating name and model, coating matching, coating thickness, color and rust removal level, etc.
1.0.5 In addition to complying with these regulations, fire-retardant or anti-corrosion coating designs should also comply with the provisions of relevant current national standards and specifications.
2 Terms
2.0.1 Protective coating Protective coating is a coating applied to protect components from or reduce damage caused by corrosion or combustion.
2.0.2 Service duration of coating Service duration of coating Under the conditions of correct construction, normal use and local maintenance, the estimated duration from the start of use to the time when the coating fails and requires comprehensive maintenance. 2.0.3 Thin-coated fire resistive coating for steel structure (intumescent fire retardant coating for steel structure) Thin-coated fire resistive coating for steel structure The coating thickness is generally 2~7mm, with a certain decorative effect, and can expand and thicken at high temperatures to improve the fire resistance limit of steel structures. 2.0.4 Thick-coated fire resistive coating for steel structure (fire-proof and heat-insulating coating for steel structure) Thick-coated fire resistive coating for steel structure The coating thickness is generally 8~50mm, with low thermal conductivity, and can form a fire-resistant and heat-insulating protective layer at high temperatures to improve the fire resistance limit of steel structures. 2.0.5 Decorated fire resistive coating Decorated fire resistive coating is applied to the surface of combustible substrates (such as wood, plastic, cardboard, fiberboard, etc.) to have a decorative effect. At high temperatures, it can form a coating with fire retardant protection. 2.0.6 A set of matched coatings A reasonable combination of compatible coatings. 2
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Substrate requirements
The steel substrate must be derusted before painting. The derusting level of the steel surface should be determined according to Table 3.0.1 based on factors such as the type of coating, the importance of the component, the difficulty of maintenance and the construction conditions. The derusting level standard should comply with the provisions of the current national standard "Rust level and derusting level of steel surface before painting" (GB8923). The derusting level of steel surface is shown in Appendix A of this regulation.
Rust removal level of steel surface
Coating types
Asphalt coating, iron red, boron barium and other oil-based
Rust-proof primer
Alkyd coating, chlorinated rubber coating, poly
styrene coating, epoxy asphalt coating
Ethylene coating, other resin coating
Ethylene phosphating primer
All kinds of zinc-rich primer, metal-plated layer
General components, not less than
Important components, not less than| |tt||St3 or Sa2
Note: ①The types of coatings listed in the table refer to the types of primers, coatings or metal spraying layers that are in direct contact with the steel base;
②For important components that are not easy to repair, the rust removal level should not be lower than Sa2; ③The surface roughness requirement for sandblasting or shot blasting is 4070um; ①The rust removal requirements of various types of rusty primers should be determined according to different product types and combined with the actual situation of the base:
③Be-grade rust removal can be used for factory-made metal components. : 3.0.2
The cement base should meet the following requirements:
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3.0.2.1The concrete strength grade should not be lower than C15, and the surface should be flat without protruding sand or gravel. The concrete surface should not be made into a cement mortar leveling layer. When the concrete surface is uneven and must be leveled, it is advisable to use polymer-modified cement mortar for leveling. When cement mortar is used, a concrete interface treatment agent that improves adhesion should be applied first. 3.0.2.2 The cement mortar mix ratio should be 1:2.0~~1:2.5 (cement: sand). Lime mortar or mixed mortar shall not be used as the base layer of anti-corrosion coating. 3.0.2.3 The coating base must be dry. In a layer with a thickness of 20mm, the moisture content should not be greater than 6%. When using moisture-curing coatings, the moisture content may not be subject to the above restrictions, but the surface of the base should be dry.
3.0.2.4 The pH value of the coating base should not be greater than 8, and there should be no cement skin, oil stains or other chemical contamination, otherwise it should be treated accordingly. When using alkali-resistant coatings, the pH value of the base may not be subject to the above restrictions. 3.0.3 The coating surface of aluminum alloy and galvanized base should be clean, dust-free, oil-free and rust-free.
3.0.4 The coating surface of the wood base should be planed, dust-free, oil-free and resin-free, and the moisture content should not be greater than 15%.
3.0.5 The plastic base layer should be degreased or roughened before painting. 3.0.6 When painting on an old coating, if it is the same type of coating, the loose parts should be removed to retain a solid coating; if a coating different from the original coating is applied, the compatibility of the two coatings should be confirmed first. If the compatibility is poor, the old coating should be completely removed. 4
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4 Fire-retardant coating
4.0.1 The fire resistance rating of factory building components shall comply with the provisions of the current national standard "Code for Fire Protection Design of Buildings"; the combustion performance rating of decoration materials shall comply with the provisions of the current national standard "Code for Fire Protection Design of Interior Decoration of Buildings", and the fire resistance rating of outdoor steel structures and steel supporting structures of combustible and flammable liquid equipment shall comply with the provisions of the current national standard "Code for Fire Protection Design of Petrochemical Enterprises". When the fire resistance rating of components needs to be improved by fire retardant coatings, it shall comply with the provisions of this chapter. 4.0.2 Thin-coat steel structure fire retardant coatings should be used for indoor exposed steel structures or thin-walled steel structures.
4.0.3 Thick-coat steel structure fire retardant coatings should be used for indoor concealed steel structures. 4.0.43
Outdoor steel structures should use outdoor steel structure fire retardant coatings. The fire resistance limit of steel structure coatings should not be less than the fire resistance limit required for components. 4.0.54
The technical performance of indoor steel structure fire retardant coatings shall comply with the provisions of Appendix B Table B.0.1 of these regulations.
4.0.6 Prestressed concrete components should use prestressed concrete floor fire retardant coatings. The fire resistance limit of the fire retardant coating should not be less than the fire resistance limit required for the component. The technical performance of prestressed concrete floor fire retardant coatings should comply with the provisions of Appendix B Table B.0.2 of these regulations. 4.0.7 For fire retardant coatings of components with a strong corrosive grade, it is advisable to use fire retardant coatings with good corrosion resistance, or add anti-corrosion measures during the coating process. 4.0.8 The structure of the fire retardant coating of steel structures and reinforced concrete components should be reasonably determined based on factors such as coating performance and fire resistance limit under use conditions. The structure of the fire retardant coating should comply with the requirements of Table 4.0.8. Examples of matching coatings are shown in Appendix C of these regulations. 5
. Component materials
Fireproof coating construction
Corrosion level of components
Medium, weak or no corrosion
Strong corrosion
Medium, weak or no corrosion
Strong corrosion
Coating construction
Rust removal of base layer
Two coats of alkali-resistant anti-rust primer
Fireproof coating for steel structure
Rust removal of base layer
Two coats of alkali-resistant anti-rust primer
Corrosion-resistant thin-coat steel structure fireproof coating base layer rust removal
Two coats of alkali-resistant anti-rust primer
Thick-coat steel structure fireproof coating
Polyester Polymer cement slurry two coats
Prestressed concrete floor fire retardant coating
Prestressed concrete floor fire retardant coating
Polymer cement slurry two coats
Note: ①If only some components of the steel structure are protected against fire, the rust removal level and primer of the base layer should be the same as those of the main structure;
②When used for outdoor steel structures or indoor humid areas, outdoor fire retardant coatings should be used;③The thick coating type fire retardant coating of outdoor steel components should be fixed with steel wire mesh;Polymer cement slurry should be selected from corrosion-resistant varieties;In addition to polymer cement slurry, alkali-resistant flame-retardant anti-corrosion coatings (not less than two coats) can also be used for surface protection of fire retardant coatings in highly corrosive environments. 4.0.8When combustible decorative materials such as wood and plastic need to improve their fire resistance, it is advisable to use decorative fire retardant coatings for protection. The technical performance of decorative fire retardant coatings should meet the requirements of Appendix B Table B.0.3 of these regulations.
Anti-corrosion coating
Design regulations
5.1.1 The corrosion level of various media to building materials shall be determined according to the current national standard "Industrial Building Anti-corrosion Design Code". 5.1.21
The design service life of the anti-corrosion coating of building components subjected to corrosive gases or dust shall be determined according to Table 5.1.2 based on factors such as their importance, maintenance difficulty and construction project requirements.
Design service life of anti-corrosion coating
Component name
Components in difficult maintenance areas
Main components
General components
Design service life (a)
The total thickness of the anti-corrosion coating of steel components shall be determined according to their design service life, corrosion level, and indoor and outdoor conditions, and should not be lower than the provisions of Table 5.1.3. m
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