This standard applies to the design, construction and acceptance of the anti-corrosion layer of steel pipelines using co-extruded or coated polyethylene adhesive tapes. The temperature of the pipeline medium should be -30-70 degrees Celsius. SY/T 0414-1998 Technical Standard for Anti-corrosion Layer of Steel Pipe Polyethylene Adhesive TapeSY/T0414-1998 Standard download decompression password: www.bzxz.net

1 General Principles
Petroleum and Natural Gas Industry Standard of the People's Republic of China Polyethylene Adhesive Tape for Steel Pipe
Technical Standard for Anticorrosion Layer
Approval Department: State Administration of Petroleum and Chemical Industry Date of Approval: 1999-03-03
Implementation Date: 1999-10-01
SY/T 0414--1998
Replaces SY4014--1993
1.0.1 This standard is formulated to ensure the quality of the anticorrosion layer of polyethylene adhesive tape for steel pipelines and to extend the service life of steel pipelines. 1.0.2 This standard applies to the design, construction and acceptance of anticorrosion layers for steel pipelines using co-extruded or coated polyethylene adhesive tapes. The temperature of the medium transported by the pipeline should be 30-70℃. 1.0.3 In addition to implementing this standard, the design, construction and acceptance of the polyethylene adhesive tape anti-corrosion layer shall also comply with the provisions of the relevant national mandatory standards in force.
2 Materials
General provisions
2.1.1 Polyethylene adhesive tapes and primers should have product instructions, certificates of conformity, and quality inspection reports. The production date and storage validity period should be indicated on the packaging.
Primers and polyethylene adhesive tapes should be stored in a cool and dry place, prevent direct sunlight, and be isolated from fire and away from heat sources. The storage temperature should be -20 to 35°C.
2.2 Steel pipes
2.2.1 The quality, specifications and models of steel pipes should comply with the provisions of the design and relevant national standards, and should have a factory certificate of conformity. 2.3 Polyethylene adhesive tapes and primers
2.3.1 Polyethylene adhesive tapes can be divided into three types according to their use: anti-corrosion adhesive tapes (inner tapes), protective adhesive tapes (outer tapes) and patch tapes. 2.3.2 Inner tape, outer tape and patch tape of appropriate specifications and thickness shall be selected according to the pipe diameter, anti-corrosion requirements and construction methods. The performance of polyethylene adhesive tape shall comply with the requirements of Table 2.3.2. Table 2.3.2
Polyethylene adhesive tape properties
Item name
Thickness?
Tensile strength of base film (MPa)
Elongation at break of base film (%)
Anti-corrosion adhesive tape
(Inner tape)
0.15~0.40
0. 15～0. 70
0.30~~1.10
≥150
Protective adhesive tape
(Outer tape)
0.25~0.60
0.15~0.25
0. 40~0.85
≥150
Testing tape
0.10~~0.30
0.20~0.80
0.30~1.10
≥200
Test method
GB/T 6672-1986
GB/T 1040--1992
GB/T 1040--1992
SY/T 0414--1998
Project name
Peel strength
(N/cm)
For base
Painted steel
For back material
Volume resistivity (α·m)
Electrical strength (MV/m)
Heat aging test (%)
Ultraviolet aging resistance
(168 h)(%)
Water absorption (%)
Water vapor permeability
(24 h) (mg/cm2)www.bzxz.net
Anti-corrosion adhesive tape
(Inner tape)
>1×1012
Protective adhesive tape
(Outer tape)
>1×1012
Padding tape
5～10
>1×1012
Test method
GB/T 2792--19810
GB/T 1410-1989
GB/T 1408—1989
Appendix A to this standard
SY/T 4013—1995
Appendix D
Appendix B to this standard
GB/T 1037—1988
Note: ① The allowable deviation of the thickness of the adhesive tape is ±5% of the thickness of the adhesive tape. ② The heat aging test refers to the change rate of the tensile strength, elongation at break and peel strength of the base film after the sample is heat aged for 2 400 h at 100°C.
③ The ultraviolet aging index refers to the retention rate of the tensile strength and elongation at break after the test. This index should be considered when setting the outdoor data. ?The national standard GB/T2792--1981 has been replaced by GB/T2792--1988 - Editor's note. 2.3.3 The primer and the adhesive tape layer should have good compatibility, and its performance should meet the requirements of Table 2.3.3. Table 2.3. 3 Primer performance
Item name
Solid content (%)
Surface drying time (min)
Viscosity (apply one 4 cups) (s)
Test method
GB/T 1725—1979(89)
GB/T 1728-—1979(89)
GB/T 1723-1993
2.3.4 If there is any doubt about the product quality or the user has any requirements, the product should be retested and its performance indicators should meet the requirements of Table 2.3.2 and Table 2.3.3 of this standard.
Grade and structure of anti-corrosion layer
The grade and structure of the anti-corrosion layer of polyethylene adhesive tape should meet the requirements of Table 3.0.1. Table 3.0.1
Grade and structure of anti-corrosion coating
Grade of anti-corrosion coating
Ordinary grade
Reinforced grade
Total thickness (mm)
Structure of anti-corrosion coating
One layer of primer-one layer of inner tape-one layer of outer tape
One layer of primer-one layer of inner tape (overlap is 50% to 55% of the tape width)-one layer of outer tape (overlap is 50% to 55% of the tape width)
Note: Q! For ordinary anti-corrosion coating, when the width of the adhesive tape is less than or equal to 75 mm, the overlap width can be greater than or equal to 10 mm; when the width of the adhesive tape is greater than 75 mm and less than 230 mm, the overlap width can be greater than or equal to 15 mm; when the width of the adhesive tape is greater than or equal to 230 mm, the overlap width can be greater than or equal to 20 mm.
② The allowable deviation of the width of the adhesive tape is ±5% of the width of the adhesive tape. 796
3.0.2 The thickness of the anti-corrosion layer at the weld should be no less than 85% of the design thickness. 3.0.3 The structure of the anti-corrosion layer for special environments and special areas shall be determined by the design. 4 Adhesive tape anti-corrosion layer construction and pipeline laying
4.1 General provisions
4.1.1 The construction of the anti-corrosion layer should be carried out at a temperature 3°C higher than the dew point. 4.1.2 When the wind and sand are strong, it is not advisable to apply primer and wrap adhesive tape without reliable protection measures. 4.2 Surface pretreatment of steel pipes
4.2.1 Surface pretreatment shall be carried out in accordance with the following provisions: 1 Remove welding slag, burrs, grease and dirt and other attachments on the surface of the steel pipe; SY/T0414--1998
2 Use spraying or mechanical rust removal methods, and its quality should reach Sa2 or St3 level specified in "Surface rust level and rust removal level of steel materials before painting" GB/T8923-1988; 3 After rust removal, the defects exposed on the surface of the steel pipe should be treated, the dust and abrasives attached to the surface should be cleaned, and the surface of the steel pipe should be kept dry. When rust or surface contamination occurs, the surface pretreatment must be repeated. 4.3 Primer
4.3.1 The time interval between the surface pretreatment of the steel pipe and the application of primer should be controlled within 6 hours, and the surface of the steel pipe must be dry and dust-free. 4.3.2 The primer should be stirred evenly in the container. 4.3.3 When the primer is thick, the thinner matched with the primer should be added to dilute it to the appropriate viscosity before construction. 4.3.4 The primer should be evenly applied without defects such as missing coating, clots and sagging. The thickness should be greater than or equal to 30μm. 4.3.5 Wait until the primer is dry before wrapping the adhesive tape. 4.4 Adhesive tape wrapping
4.4.1 The temperature of the adhesive tape when unwinding should be above 5℃. 4.4.2 When wrapping the adhesive tape, if gaps are generated on both sides of the weld, filler tape or putty with good compatibility with the primer and adhesive tape can be used to fill both sides of the weld.
4.4.3 Use appropriate mechanical or manual tools to wrap the adhesive tape on the primed pipe according to the overlap requirements. The overlap length between the beginning and end of the adhesive tape should be no less than 1/4 of the circumference of the pipe and no less than 100mm. The overlap seams of the inner and outer tapes should be staggered. When wrapping, the edges of the adhesive tape should be parallel and not twisted or wrinkled, and the ends of the tape should be pressed so that they do not curl up. 4.4.4 Cold or hot wrapping can be used when wrapping adhesive tape in the factory. When wrapping the anti-corrosion pipe, there should be a welding reserve section of 150mm ± 10mm at the pipe end.
4.4.5 When wrapping special-shaped pipe fittings, patch tape should be used, and other special adhesive tapes with better performance than patch tape can also be used. The surface pretreatment and primer requirements when wrapping special-shaped pipe fittings are the same as those of the pipe body. 4.4.6 Prefabricated anti-corrosion pipes should be quality inspected in accordance with the requirements of Chapter 5 of this standard. After passing the inspection, the factory certificate shall be provided to the user. 4.5 Marking, stacking and handling of prefabricated anti-corrosion pipes 4.5.1 Qualified anti-corrosion pipes should be marked 1m away from the pipe end, indicating the specifications and materials of the steel pipe, the type and grade of the anti-corrosion layer (ordinary grade: red; reinforced grade: green), the inspector code, the name of the coating factory, the production date and the implementation standard, etc. 4.5.2 The number of stacking layers of anti-corrosion pipes should be based on the principle of not damaging the anti-corrosion layer. Different types of finished pipes should be stacked separately, and soft objects should be placed between the layers and at the bottom of the anti-corrosion pipes to avoid damaging the anti-corrosion layer. 4.5.3 When loading, unloading and transporting anti-corrosion pipes, wide nylon belts or special lifting equipment should be used. It is strictly forbidden to drop, bump, pry or other operations that damage the anti-corrosion layer. 4.6 Repairing
4.6.1 When repairing, the damaged part should be trimmed, cleaned and primed. 4.6.2 When using the same adhesive tape or patching tape as the pipe body, the winding method should be used for repair; special adhesive tape can also be used for repair by patching. The winding and patching width should exceed the damaged edge by more than 50mm. 4.6.3 When using the same adhesive tape as the pipe body for repairing, the grade and structure of the anti-corrosion layer at the repaired part should be the same as that of the pipe body. When using patching tape 797
SY/T 0414-1998
or special adhesive tape to patch the damage, the performance of the anti-corrosion layer at the patched location shall not be lower than that of the pipe body. 4.7 Patching
4.7.1 When patching, the loose part of the anti-corrosion layer at the pipe end should be removed, and the weld nodules, burrs and other dirt in the weld area should be removed. The patched location should be kept dry. The quality of the surface pretreatment should reach the St3 level specified in GB/T8923-1988. 4.7.2 Patching tape should be used at the connection parts and welds, and the patching should be carried out according to the provisions of Article 4.4.3 of this standard. The overlap width of the patching layer and the original anti-corrosion layer should not be less than 100mm.
4.7.3 The width of the patching adhesive tape should adopt the specifications specified in Table 4.7.3. Table 4.7.3 Matching table of pipe diameter and patching adhesive tape width Nominal pipe diameter (mm)
51)100
150~~200
Packing adhesive tape width (mm)
4.7.4 The performance of the anti-corrosion layer at the patching should not be lower than that of the pipe body. 4.8 Pipeline laying
Nominal pipe diameter (mm)
250~950
1 000～1 500
4.8.1 The buried laying of polyethylene adhesive tape anti-corrosion pipelines shall meet the following requirements: 1 Before laying in the trench, the anti-corrosion pipes should not be stored in the open air for more than 3 months; 2 The depth of the trench should meet the design requirements;
The cleaning of the trench, laying in the trench, backfilling and hoisting should meet the requirements of the corresponding construction acceptance specifications; 3
Width of patch adhesive tape (mm)
Before laying in the trench, 100% of the pipelines should be tested for electric spark leakage, and the leakage detection voltage should meet the requirements of Article 5.0.1, paragraph 4 of this standard; 4
The inspection after pipeline backfilling should be carried out in accordance with the corresponding pipeline construction acceptance specifications. 5
When polyethylene adhesive tape anti-corrosion pipelines are laid overhead, they should meet the requirements of the corresponding construction acceptance specifications. 4.8.2
5 Quality standards and inspection methods for anti-corrosion layer
5.0.1 The quality of the anti-corrosion layer of adhesive tape shall meet the following requirements: 1 Appearance: Visual inspection of the entire pipeline. Visual inspection shall be conducted on each pipeline in the prefabrication plant. The patching and repairing parts shall be inspected one by one. The surface of the anti-corrosion layer shall be flat, the overlap shall be uniform, and there shall be no permanent bubbles, wrinkles and damage. 2 Thickness: Measure according to the "Non-destructive Measurement Method for Thickness of Pipeline Anti-corrosion Layer (Magnetic Method)" SY0066. The thickness shall meet the requirements of Chapter 3 of this standard. One pipe shall be randomly inspected for every 20 pipes, and one place shall be randomly measured. Four points shall be measured evenly distributed in the circumferential direction at each place; one place shall be randomly inspected for each patching and repairing part. If the thickness is unqualified, double inspection shall be conducted. If it is still unqualified, it shall be judged as unqualified. 3 Peeling strength: Use a knife to cut the tape layer with a width of 10mm and a length greater than 100mm in the circumferential direction until the pipe body. Then use a spring balance to pull it apart at a 90° angle to the pipe wall, as shown in Figure 5.0.1. The pulling speed should not exceed 300mm/min, and the peel strength should comply with the provisions of Table 2.3.2 of this standard. This test should be carried out 4 hours after the adhesive tape is wrapped. Three locations should be tested for every meter of anti-corrosion pipeline; during factory prefabrication, 3% of the total production volume should be spot-checked daily, and no less than 3 pipes, and 1 location should be measured for each pipe; the number of spot checks at the patching and repairing locations is 1% of the total number of patches or repairs. If one location is unqualified, double the spot check, and if it is still unqualified, all should be repaired. 4 Electric spark inspection: Each pipe should be inspected at the prefabrication plant, and the entire pipeline should be inspected on site. The patching and repairing locations should be inspected one by one. The moving speed of the leak detection probe should not exceed 0.3m/s, and it is qualified if there is no spark. The leak detection voltage is determined according to the following formula. When 7<1 mm:
V = 3 294 T.
When T≥1 mm:
V-7843VT
(5.0. 1-1)
(5.0.1-2)
Wherein, leakage detection voltage (V);
T-anticorrosive layer thickness (mm).
5 When the appearance, thickness, and leakage detection are unqualified, partial or full-line repairs should be carried out. 6 Records should be kept for each test result.
Anti-magic layer
6Safety, hygiene and environmental protection
Figure 5.0.1 On-site peel strength test
6.0.1 The primer should be sealed and stored away from fire sources. 6.0.2 Firefighting equipment should be available at the primer storage area and construction site. Spring scale
SY/T 0414-1998
6.0.3 The safety and environmental protection of coating production shall comply with the requirements of the current national standards "Safety Regulations for Coating Operations - Safety of Pre-treatment Process for Painting" GB7692 and "Safety Regulations for Coating Operations - Ventilation and Purification of Pre-treatment Process for Painting" GB7693. 6.0.4 The noise generated by various equipment during the rust removal of steel pipelines shall comply with the relevant provisions of "Design Specifications for Noise Control in Industrial Enterprises" GBJ87.
6.0.5 The dust content in the air at the rust removal and coating site shall not exceed the relevant provisions of "Design Hygiene Standards for Industrial Enterprises" TJ36. 7 Handover materials
7.0.1 After the completion of the adhesive tape anticorrosion project, the construction unit shall submit the following documents to the construction unit: 1 Brief content of the anticorrosion project, construction methods and processes; 2 Factory certificate and quality inspection report of the anticorrosion adhesive tape and primer; Quality inspection record;
Rework records should include the repair location, reason, method, quantity and inspection results; 4
Other relevant information.
Appendix A
Heat aging test method
A.0.1 This test method is used to evaluate the ability of polyethylene adhesive tape to resist heat aging. 1 Specimen: Tensile strength and elongation at break specimens shall be made according to the current "Plastic Tensile Properties Test Method" GB/T1040; peel strength specimens shall be made according to the current "Pressure-sensitive Adhesive Tape 180° Peel Strength Determination Method" GB/T2792. 2 Test temperature: 100 ± 2)℃.
3 Test: Heat the sample, take out 5 samples every 400h, and test according to GB/T1040 and GB/T2792. 4 Test time: 2400h.
SY/T0414—1998
5 Data processing formula:
C=^=×100%
Performance (base film tensile strength, base film elongation at break, peel strength) change rate; where: C——
α-original performance (arithmetic mean);
b-performance after aging (arithmetic mean), Appendix B
Test method for water absorption of polyethylene adhesive tape B.0.1 This test method is applicable to the determination of water absorption performance of polyethylene adhesive tape. B.0.2 The test equipment should meet the following requirements: 1 Analytical balance: sensitivity 0.1mg;
2 Oven: room temperature ~ 200℃;
3 Constant temperature water bath: room temperature ~ 100℃, temperature control accuracy ± 2℃; 4 Dryer: use anhydrous calcium chloride or silica gel as desiccant. B.0.3 The preparation of test pieces should meet the following requirements: (A.0.1)
1 Press two pieces of polyethylene adhesive tape together, and then cut them into 50mm×50mm test pieces. The thickness of the test piece is the thickness of two layers of adhesive tape:
2 The surface of the test piece should be clean, flat, smooth, and free of defects such as bubbles and cracks; 3 Each group of test pieces should be no less than 3.
B.0.4 The test steps shall meet the following requirements: 1 Dry the specimen in an oven at (50±2)℃ or a room temperature dryer for 24h for pretreatment; 2 Weigh the mass of the pretreated specimen ml, accurate to 0.1mg; 3 Immerse the specimen vertically in distilled water at (25±2℃). There should be no bubbles on the surface of the specimen, and the specimens should not contact each other or the container wall;
4 After immersion for 24h, take out the specimen, use filter paper to absorb the moisture on the surface of the specimen, and immediately weigh the mass of the specimen m2, accurate to 0.1mg; 5 Place the immersed and weighed specimen in an oven at (50±2)℃ or a room temperature dryer for 24h, and weigh the mass after drying m3, accurate to 0.1mg.
B.0.5 The calculation of the test results shall meet the following requirements: 1 The mass increase rate of the specimen after immersion Wpel (%) is calculated according to formula (B.0.5-1), and the value is rounded to 2 significant digits Wpel = [(m2 - m)/ml] × 100
(B. 0. 5-1 )
2After immersion, the mass loss rate of soluble matter S(%) of the specimen is calculated according to formula (B.0.5-2), and the value is rounded to 2 significant figures. S =[(mi - m3)/m]x 100
3The water absorption rate Wp (%) of the specimen is calculated according to formula (B.0.5-3): Wpe = Wpei + S
4The test results are expressed as the arithmetic mean of the calculation results of each group of specimens, and the values ​​are rounded to 2 significant figures. 800
( B.0. 5-2 )
（B.0.5-3）
Appendix C
Reference dosage table of anticorrosive adhesive tape
C.0.1 The dosage of anticorrosive adhesive tape for manual mechanical winding can be selected by referring to Table C.0.1. Manual mechanical winding material dosage table
Nominal diameter
1 219, 2
Surface area
(m2/m)
Note: ①The values ​​in the table do not include the loss of on-site construction. ②Normal loss: 4% for adhesive tape, 15% for primer, and 15% for adhesive tape
Minimum overlap width
Minimum required amount
(m2/m)
SY/T 0414—1998
Minimum amount
(m2/L)
Minimum required amount
SY/T0414—1998
The amount of anticorrosive adhesive tape used in power machinery winding can be selected by referring to Table C.0.2. Table C. 0. 2 Power machinery winding material consumption table Steel
Nominal diameter
Surface area
(m2/m)
Note: ①) The values ​​in the table do not include the loss of on-site construction. @Normal loss: 4% for adhesive tape and 15% for primer. 802
Adhesive tape
Minimum overlap width
Minimum required amount
(m2/mm)
Minimum amount
(m2/L)
Minimum required amount
C.0.3 The amount of anticorrosive adhesive tape used for manual wrapping can be selected by referring to Table C.0.3. Table C.0.3
Material usage table for manual wrapping
Nominal diameter
Surface area
(m2/m)
Note: ①The values ​​in the table do not include the loss of on-site construction. Bandwidth
②Normal loss: 4% for adhesive tape and 15% for primer. Adhesive tape
Minimum overlap width
Minimum required quantity
(m2/m)
SY/T0414—1998
Minimum quantity
(m2/L)
Minimum required quantity
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