1 Scope
This specification specifies the construction technology and quality requirements of external surface anticorrosive coating for steel equipment, pipelines and steel structure in petrochemical industry.
It is applicable to the construction of external surface anticorrosive coating for steel equipment, pipelines and steel structure in constructed, renovated and extended works of petrochemical industry but not construction of anticorrosive coating for long-distance pipelines.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this specification. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the documents indicated below. For undated references, the latest edition applies.
GB 50484 Code for technical of construction safety in petrochemical engineering
GB/T 4510 Test method for determining the breaking point of petroleum bitumens
GB/T 8923 Rust grades and preparation grades of steel surfaces before application of paints and related products
SH/T 3503 Regulation of technical document for construction completion of petrochemical industry project
SH/T 3543 Technical document specification of construction process for petrochemical engineering project
SH/T 3548 Acceptance specification for construction quality of anticorrosive coating in petrochemical industry
3 Terms and definitions
For the purposes of this specification, the following terms and definitions apply.
3.1
coating
a generic term for a kind of liquid or solid materials coated on the surface of steel to form a continuous solid film with corrosion protection, decoration or special properties (such as identification, insulation, abrasion resistance)
3.2
coat
continuous film layer formed as a result of coating application
3.3
painting
painting, also called coating application, refers to the process of applying coating on the base surface to form a coat with protection, finishing or specific functions
3.4
anti-corrosive coat
a kind of coat mainly used to prevent corrosion of steel
3.5
surface lay
small spacing and tiny peak and valley roughness of the treated steel surface
3.6
glue strength
adhesion and strength formed between the coat and the steel surface or the coats
3.7
adhesion
total binding force of the coat and the base
3.8
film
thickness of continuous films formed by applying one or more coats
3.9
priming coat
coat under the intermediate coat or top coat in the coat system, or the coat directly applied to the steel surface
3.10
top coat
coat above the intermediate coat or priming coat in the coat system
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Surface treatment
6 Construction of coat
6.1 Construction of coat for above-ground equipment, pipelines and steel structures
6.1.1 Use of coating
6.1.2 Construction of coat
6.1.3 Construction by brushing method
6.1.4 Construction by rolling method
6.1.5 Construction by air spraying method
6.1.6 Construction by high pressure airless spraying method
6.1.7 Coat inspection
6.2 Construction of coat for buried equipment and pipelines
6.2.1 Anticorrosive material
6.2.2 Preparation and construction of petroleum bitumen coating
6.2.3 Preparation and construction of epoxy coal bitumen
6.2.4 Preparation and construction of modified high-build epoxy coating
6.2.5 Joint coating and repair of coating defects
6.2.6 Construction in winter
6.2.7 Protection of finished products
6.2.8 Coat inspection
7 Common coating construction
7.1 General requirements
7.2 Preparation and painting of zinc-rich coating
7.3 Preparation and painting of alkyd resin acid-resistant coating
7.4 Preparation and painting of phenolic resin paint
7.5 Preparation and painting of polyurethane paint
7.6 Preparation and painting of epoxy resin paint
7.7 Preparation and painting of silicone resin paint
7.8 Preparation and painting of chlorinated rubber paint
7.9 Preparation and painting of acrylic resin and its modified coating
8 Safety protection
9 Technical document for construction process
Annex A (Informative) Test standards for re-inspection of coatings
Annex B (Informative) Anti-corrosive coat structure and anticorrosion grade of buried equipment and pipelines
Annex C (Informative) Relationship among dew point, ambient temperature and relative humidity
Annex D (Informative) Inspection records of surface treatment
Annex E (Informative) Calculation of coating use quantity
Annex F (Informative) Causes of defects in painting and prevention measures
Annex G (Informative) Inspection records of coat quality for above-ground equipment, pipelines and steel structures
Annex H (Informative) Inspection records of coat quality for buried equipment and pipelines
Explanation of wording
