This standard applies to the design, construction and acceptance of epoxy coal tar anti-corrosion coatings on the outer wall of buried steel pipelines with a medium temperature not exceeding 110 degrees Celsius. When steel storage tanks use epoxy coal tar anti-corrosion coatings, they can be used as a reference. SY/T 0447-1996 Technical Standard for Epoxy Coal Tar Anti-Corrosion Coatings for Buried Steel PipelinesSY/T0447-1996 Standard download decompression password: www.bzxz.net

Standard of coal tarepoxy coating for buried steel pipeline
SY/ T 0447- 96
Editor: China Petroleum and Natural Gas Pipeline Research Institute Approval Department: China National Petroleum Corporation Petroleum Industry Press
1996 Beijing
Grade and structure of anti-corrosion layer
Epoxy coal green paint
Glass cloth
Material acceptance
Construction technical requirements
Preparation work
Paint preparation
Primer
Putty
Topcoat and glass cloth wrapping
Inspection and repair of anti-corrosion layer
General requirements
Appearance inspection
Thickness inspection
Leak inspection
Adhesion inspection
Marking and recording
Storage and transportation
Painting and repairing
Repairing·
Ditching and backfilling
Completion data
(11）
(13）
(14）
(15）
(15）
(18）
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Power frequency electrical strength of coal tar pitch anti-corrosion layer Test sub-method (19) Test method for volume resistivity of epoxy coal tar anti-corrosion coating··(22) Test method for water absorption of epoxy coal tar anti-corrosion coating·Test method for oil resistance of epoxy coal tar anti-corrosion coating·Method·Test method for boiling water resistance of epoxy coal tar anti-corrosion coating Explanation of terms used in this standard
Additional explanation
Appendix, Explanation of clauses of the technical standard for epoxy coal tar anti-corrosion coating for buried steel pipelines
·(25)
【27)
(30）
China National Petroleum Corporation Document
(96) CNPC Technical Supervision No. 561
Notice on the approval and release of five oil and gas industry standards including the "Technical Standard for Direct Current Drainage Protection of Buried Steel Pipelines"
To all relevant units
The five oil and gas industry standards including the "Technical Standard for Direct Current Drainage Protection of Buried Steel Pipelines" (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: Serial No.
SY/T 0017-96
SY 7T 0090-96
SY/T 0415--96
SY 7T 0447--96
SY7T 0546-1996
Technical standard for direct current discharge protection of underground steel pipelines (replacing SYJ17-86)
Design specification for oil and gas field and pipeline instrument control system
Technical standard for rigid polyurethane foam anticorrosion and insulation layer of buried steel pipelines (replacing
SYJ 18-86. SYJ 4015-87.
SYJ 401687)bzxZ.net
Technical standard for epoxy coal tar anticorrosion layer of buried steel pipelines (replacing SYJ28-87
SYJ 4047-90)
Collection and identification of corrosion products
The above standards shall come into force on June 1, 1997. China National Petroleum Corporation
November 15, 1996
1 General
11 This standard is specially formulated to ensure the quality of epoxy coal tar coating.
1.0.2 This standard applies to the design, construction and acceptance of epoxy coal tar coating on the outer wall of buried steel pipelines with a medium temperature not exceeding 110°C. When epoxy coal tar coating is used on steel storage tanks, it can be implemented as a reference. 1.0.3 In addition to implementing this standard, the design and construction of epoxy coal tar coating for buried steel pipelines shall also comply with the provisions of the relevant current national standards (specifications). 1.0.4 Reference standards
GB/T 1408-1989
GB/ T 1410 --1989
Rate test method
GB T 1720---1979
GB T 1723----1993
GB7T 1724--1973
GBT 1725-1979
GB T 1728--1979
GBT 1730-I993
GB/ T 1731-1993
GB7 T 1732--1993
GB 7T 1738--1979
GB /T 1763--1979
Test method for power frequency electrical strength of solid insulating materialsDetermination of volume resistivity and surface electrical film gradient of solid insulating materials
Determination of viscosity of paint
Determination of fineness of paint
Determination of solid content of paint
Determination of drying time of paint film and putty film
Determination of hardness of paint filmPendulum damping test
Determination of flexibility of paint film
Determination of resistance to impact of paint film
Determination of water absorption of insulating paint film
Determination of resistance to chemical reagents of paint film
+B3186-1982 Sampling of road material products
SYJ37-89 Pipeline Cathodic peeling test method for anticorrosion coating SYJ41-89 Shear strength test method for bonding between pipeline anticorrosion coating and metal
SY0063--92 Leakage test method for pipeline anticorrosion coating SYJ4001--90 Construction and acceptance specification for long-distance pipeline line engineering SYJ4007-86 Specification for surface treatment of steel materials before painting JISK5664-1983 Coal tar epoxy resin coating ANSI AWW AG21078 Standard for epoxy coal tar internal and external anticorrosion coating for steel water pipeline
2 Grade and structure of anticorrosion coating
2.0.1 In order to meet the requirements of different corrosive environments for anticorrosion coating, epoxy coal tar anticorrosion is divided into three grades: ordinary grade, strong grade and extra strong grade. Its structure consists of a primer and a multi-layer topcoat, and glass cloth can be added between the lips of the topcoat to enhance it. The grade and structure of the anti-tumor layer are shown in Table 2.0.1.
Grade and structure of anti-corrosion layer
Ordinary grade
Reinforced grade
Extra reinforced grade
Primer, topcoat, one-side paint, topcoat
Topcoat, topcoat, glass cloth, topcoat
Primer—
Primer, one-side paint, one-side paint
Glass cloth, topcoat, one-side paint, glass cloth, paint topcoat
Table 2.0.1
Dry thickness (mm)
Note: "Surface, glass cloth. Surface reading" should be applied continuously and deeply, and can also be replaced by a layer of glass cloth soaked in the surface. 2.0.2 In the case of severe corrosion environment or user requirements, the number of topcoat layers can be appropriately increased in the anti-corrosion layer.
3 Materials
3.1 Epoxy coal tar paint
3.1.1 Epoxy coal tar paint is a two-component paint, component A and component B. The primer component A plus component B (curing agent), the topcoat component A plus component B (curing agent), and the corresponding diluents are used together.
3.1.2 The technical indicators of epoxy coal tar paint shall comply with the provisions of Table 3.1.2-1, Table 3.1.2-2 and Table 3.1.2-3.
Technical index of component A
Viscosity (T-4
Viscometer
Fineness (jm)
Solid maximum?
Temperature type
Temperature type
Temperature type
Low-temperature type
60～100
80~150
50～120
Table 3, 1.2-1
Test method
GB /T 1723-1993
GB /T 1724--1979
GB/T 1725--1979
Note: 1 When the viscosity of thick paste type topcoat is greater than 150s, a corresponding viscosity measurement method should be established. 3.1.3 Each batch of paint entering the factory should provide the data specified in Items 1 to 2 of Table 3.1.2-1 and Item 15 of Table 3.1.2-2. When the paint formula is adjusted, the raw materials or production process have major changes, Table 3.1.2-1, Table 3.1.2-2 and Table 3.1.2-3 full set of data specified.
Drying time
Surface temperature type
Dry low temperature type
(25℃!【℃h)Actual room temperature type
Dry low temperature type
Color and appearance
Adhesion strength (grade)
Flexibility (mm)
Impact resistance (cm)
10%H,SO
Chemical resistance
Reagent resistance
10%Na 0H
(Room temperature, 3d)
30%NaCI
(Room temperature, 3d)
Technical indicators of paint film
Reddish brown, matte
Black, glossy
No peeling
Complete film
No change in paint film
No change in paint film
Table 3.1.2-2
Test method
GB/T 1728—1979
GBT17201979
GBT 1731
GB/ T 1732
GB T 1730-
GB/T 17631979\
Note: 1 The paint film should be subjected to sea shrinkage low-pressure leak detection according to method A of "Test method for leak detection of pipeline anti-corrosion layer" before the test can be carried out.
Technical indicators of anti-corrosion layer
Shear bond strength (MPa)
Cathode residual separation (level)
Power frequency electrical strength (MV/m)
Volume resistivity (0·m)
>1× 10
Table 3.1.2-3
Test method
SYJ 41-89
SYJ 37-$9
Appendix A of this standard
Appendix B of this standard
False water rate (25.24%)
Oil resistance (kerosene. Room temperature 7
Boiling water resistance (24h)
3.2 Glass cloth
Continued Table 3.1.2-3
Test method
Appendix to this standard
Appendix D of this standard
Appendix E of this standard
3. 2.1 When using glass cloth as the reinforcing base cloth for the anti-corrosion layer, it is advisable to select a glass cloth roll with a warp and weft density of (10×10) roots/cm, a thickness of 0.10-0.12mm, medium alkali (alkali content not exceeding 12%), no mask, plain weave, two-side edge sealing, and a core shaft. 3.2.21
Regardless of the diameter, the appropriate width of glass cloth is shown in Table 3.2.2 Glass cloth width
Pipe diameter (oNmm)
Cloth width (mm)
[00-- 250
250~500
3.3 Material acceptance
The four supporting materials of primer, topcoat, curing agent and thinner should be supplied by the same manufacturer.
3.3.2 The paint should have complete product label, product instruction and quality certificate including brand name, production date, storage period, etc.: No, the court will reject it. 3.3.3 The content of the paint instruction should include the technical indicators of the paint, the proportion of each component, the service life of the paint after preparation, the coating method, the reference dosage, and the precautions during transportation and storage.
3.3.4 The paint should be spot checked according to the sampling number specified in "Sampling of Paint Products": The quality meets this standard, etc. The provisions of Article 3.1.3 shall be met. If unqualified, re-inspection shall be conducted and the number of samples shall be doubled. If still unqualified, the batch of coatings shall be unqualified and shall be rejected.
3.3.5 The storage period of coatings shall not be less than 1 year. Users shall store the coatings according to the conditions required by the product manual and use them within the storage period. Coatings that have exceeded the storage period shall be re-inspected according to the provisions of Article 3.3.4 of this standard and can only be used if they meet the requirements. 3.3.6 Glass cloth shall have the name of the manufacturer, date of manufacture, product manual and quality certificate, otherwise it shall be rejected.
3.3.? Glass cloth shall be inspected and accepted according to the product manual and purchase contract, and generally shall comply with the provisions of Articles 3.2.1 and 3.2.2 of this standard.
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