1 Scope
This standard specifies the minimum technical requirements of PE tape coating for steel pipeline. This standard is applicable to the design, construction and acceptance for PE tape coating of steel pipeline. Design, construction and acceptance of PP tape coating may be carried out in reference to this standard.
The working temperature of PE tape coating pipeline shall be less than or equal to 70℃.
As for the design, construction and acceptance for PE tape coating of steel pipeline, not only the requirements stipulated in this standard, but also those in the current relevant compulsory ones of the nation shall be complied with.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 1037 Test method for water vapor transmission of plastic film and sheet-Cup method
GB/T 1408.1 Methods of test for electric strength of solid insulating materials-Tests at power frequencies
GB/T 1410 Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials
GB/T 1723 Determination of viscosity of coatings
GB/T 1725 Methods of test for non-volatile matter of varnishes, paints and their vehicles
GB/T 1728 Methods of test for drying time of coatings of paints and putties
GB/T 2792 Test method for peel strength of pressure-sensitive tape at 180° angle
GB/T 6672 Plastics film and sheeting--Determination of thickness by mechanical scanning
GB 7692 Safety code for painting--Safety, ventilation and air clean-up for pretreatment process of painting
GB/T 8923 Rust grades and preparation grades of steel surfaces before application of paints and related products
GB/T 13022 Plastics-Determination of tensile properties of films
GBJ 87 Specifications for the design of noise control system in industrial enterprises
GBZ 1 Hygienic standards for the design of industrial enterprises
SY/0066 Standard test method for nondestructive measurement of film thickness of pipeline coatings on steel (magnetic method)
SY/T 0315-2005 Technological Standard of External Fusion Bonded Epoxy Coating for Steel Pipeline
SY 0401 Standard for construction and acceptance of oil and natural gas pipeline project
SY/T 0413-2002 Technical standard of polyethylene coating for buried steel pipeline
3 Structure and Grade of Coating
3.1 Coating structures are divided into:
1. Composite structure composed of primer, anti-corrosion tape (inner tape) and protective tape (outer tape);
2. Coating structure composed of primer and anti-corrosion tape.
Design organizations shall select the structure according to the environment conditions, anti-corrosion requirements and PE tape product characteristics.
3.2 Coating grade
According to different pipe diameter, environment, anti-corrosion requirements and construction conditions, the coating structure and thickness (including the total thickness of primer, anti-corrosion tape, protective tape and coating) are changeable, but the total thickness of coating shall not be less than the requirements of Table 1. PE tape coating of buried pipeline should adopt reinforcement grade and special reinforcement grade.
