{"id":6323,"date":"2025-07-09T15:55:17","date_gmt":"2025-07-09T07:55:17","guid":{"rendered":"https:\/\/alllandpipes.com\/?post_type=etheme_portfolio&p=6323"},"modified":"2025-12-17T19:06:26","modified_gmt":"2025-12-17T11:06:26","slug":"sy-t-0413","status":"publish","type":"etheme_portfolio","link":"https:\/\/alllandpipes.com\/fr\/standards\/sy-t-0413.html","title":{"rendered":"SY\/T 0413"},"content":{"rendered":"
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SY\/T 0413-2002: Technical Standard for Polyethylene Coating of Buried Steel Pipelines<\/strong><\/span><\/h2>

1. D\u00e9finition de la norme et contexte<\/b><\/strong><\/span><\/h3>

SY\/T 0413-2002<\/b><\/strong>:<\/b><\/strong>Released by National Economic and Trade Commission of China\u2002on May 28, 20021 implemented on August 1, 2002. I This petroleum industry standard (PS) is developed by Petroleum Engineering Construction Standardization Committee and\u2002formulated by CNPC Engineering Technology R&D Institute. It has replaced SY\/T 4013-1995 and\u2002reached consensus standard for corrosion protection of buried steel pipe epoxy powder coating of polyethylene recommend standard.<\/p>

Key Objectives: <\/b><\/strong>Long-term corrosion protection Structure support in soil\u2002environments through:<\/p>

Standardisation of 2\u2002(2PE) and 3 (3PE) interceptor coating systems<\/p>

Performance levels of workable\u2002material<\/p>

Quality control protocols<\/p>

Field application procedures<\/p>

Historical Context:<\/b><\/strong><\/p>

Developed\u2002during China’s Pipeline construction (1990s–early 2000s)<\/p>

Adopted German DIN 3067-1991 with variation for\u2002Chinese climatic conditions<\/p>

Replaced by GB\/T\u200223257 (2010) and still in use for legacy projects<\/p>

2. <\/b><\/strong>Scope <\/b><\/strong>of Application<\/b><\/strong><\/span><\/h3>

2.1 Service Environments<\/b><\/strong><\/span><\/h4>
Type de rev\u00eatement<\/b><\/strong><\/td>Temp. Range<\/b><\/strong><\/td>Applications primaires<\/b><\/strong><\/td><\/tr>
Normal (N-Type)<\/b><\/strong><\/td>-30\u00b0C to 50\u00b0C<\/td>Oil\/Gas\/Water transmission (non-aggressive soils)<\/td><\/tr>
High-Temp (H-Type)<\/b><\/strong><\/td>-30\u00b0C to 70\u00b0C<\/td>Geothermal\/desert pipelines<\/td><\/tr><\/tbody><\/table><\/figure>

2.2 Pipeline Systems Covered<\/b><\/strong><\/span><\/h4>

Energy Transport<\/b><\/strong>: Crude oil, natural gas, refined products (design pressure \u22644.0 MPa)<\/p>

Municipal Utilities<\/b><\/strong>: Water supply\/drainage, irrigation networks<\/p>

Industrial Lines<\/b><\/strong>: Slurry transport, steam pipelines<\/p>

3. Coating Structure & Material Requirements<\/b><\/strong><\/span><\/h3>

3.1 Coating Systems<\/b><\/strong><\/span><\/h4>
Structure<\/b><\/strong><\/td>Layers<\/b><\/strong><\/td>Caract\u00e9ristiques principales<\/b><\/strong><\/td><\/tr>
2PE<\/b><\/strong><\/td>\u2460 Adhesive + \u2461 PE<\/td>Cost-effective; moderate corrosion resistance<\/td><\/tr>
3PE<\/b><\/strong><\/td>\u2460 FBE + \u2461 Adhesive + \u2462 PE<\/td>Superior adhesion\/mechanical protection<\/td><\/tr><\/tbody><\/table><\/figure>

3.2 Thickness Requirements<\/b><\/strong><\/span><\/h4>

Table: Minimum Coating Thickness (mm)<\/p>

Pipe DN (mm)<\/b><\/strong><\/td>FBE (\u03bcm)<\/b><\/strong><\/td>Adhesive (\u03bcm)<\/b><\/strong><\/td>PE Layer<\/b><\/strong><\/td><\/tr>
Std (G)<\/b><\/strong><\/td>Reinf (S)<\/b><\/strong><\/td><\/tr>
<100<\/td>\u2013<\/td>170\u2013250<\/td>1.8<\/td>2.5<\/td><\/tr>
100\u2013800<\/td>60\u2013150<\/td>170\u2013250<\/td>3.0<\/td>3.7<\/td><\/tr><\/tbody><\/table><\/figure>

3.3 Material Specifications<\/b><\/strong><\/span><\/h4>

Epoxy Powder (FBE)<\/b><\/strong>:<\/p>

Gel time (200\u00b0C): \u226430 sec<\/p>

Cathodic disbondment (65\u00b0C\/48h): \u226410 mm<\/p>

Adhesion: \u2264Grade 2 (cross-cut test)<\/p>

Adhesive<\/b><\/strong>:<\/p>

Peel strength: \u226535 N\/cm (2PE), \u226560 N\/cm (3PE) at 20\u00b0C<\/p>

Softening point: \u226590\u00b0C (2PE), \u226580\u00b0C (3PE)<\/p>

Polyethylene<\/b><\/strong>:<\/p>

Density: \u22650.940 g\/cm\u00b3<\/p>

Carbon black: 2.0\u20132.4%<\/p>

Thermal aging (100\u00b0C): \u0394MFR \u226435% after 2,400h (N-Type) or 4,800h (H-Type)<\/p>

4. Manufacturing & Construction<\/b><\/strong><\/span><\/h3>

4.1 Surface Preparation<\/b><\/strong><\/span><\/h4>

Abrasive cleaning<\/b><\/strong>: Sa 2.5 (near-white metal)<\/p>

Anchor profile<\/b><\/strong>: 50\u201375 \u03bcm<\/p>

Preheating<\/b><\/strong>: 40\u201360\u00b0C (max 4h before coating)<\/p>

4.2 Coating Application<\/b><\/strong><\/span><\/h4>
Process<\/b><\/strong><\/td>Param\u00e8tres<\/b><\/strong><\/td><\/tr>
FBE Spraying<\/td>Voltage: 40\u201380 kV; Thickness: 60\u2013150 \u03bcm<\/td><\/tr>
Adhesive\/PE Extrusion<\/td>Temp: 150\u2013170\u00b0C; Weld overlap: \u226510 mm<\/td><\/tr>
Cooling<\/td>Water-cooled to \u226460\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>

End Treatment<\/b><\/strong>:<\/p>

100\u2013150 mm uncoated zone at pipe ends<\/p>

Bevel angle: \u226430\u00b0<\/p>

Temporary rust inhibitor: \u226550 \u03bcm DFT<\/p>

5. Testing & Inspection<\/b><\/strong><\/span><\/h3>

5.1 Performance Requirements<\/b><\/strong><\/span><\/h4>
Test<\/b><\/strong><\/td>Exigence<\/b><\/strong><\/td><\/tr>
R\u00e9sistance aux chocs<\/b><\/strong><\/td>No cracking at 24 J<\/td><\/tr>
D\u00e9collement cathodique<\/b><\/strong><\/td>\u226415 mm (2PE), \u226410 mm (3PE) at 65\u00b0C\/48h<\/td><\/tr>
Bend Test<\/b><\/strong><\/td>No cracking at 2.5\u00b0 bend<\/td><\/tr>
Peel Strength<\/b><\/strong><\/td>\u226535 N\/cm (2PE), \u226560 N\/cm (3PE) at 20\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>

5.2 Quality Control<\/b><\/strong><\/span><\/h4>

100% inspection<\/b><\/strong>: Visual + holiday detection (25 kV)<\/p>

Thickness checks<\/b><\/strong>: 1st\/5th\/10th pipe per batch, then 1 per 10 pipes<\/p>

Sampling frequency<\/b><\/strong>:<\/p>

Peel test: 1 per 50 pipes<\/p>

Mechanical properties: Per 8h shift<\/p>

6. Engineering Applications & Limitations<\/b><\/strong><\/span><\/h3>

6.1 Major Projects<\/b><\/strong><\/span><\/h4>

West-East Gas Pipeline I<\/b><\/strong>: 3,000+ km with 3PE coating (15+ years service)<\/p>

Sino-Russian Crude Pipeline<\/b><\/strong>: H-Type coating for -45\u00b0C environments<\/p>

Urban Gas Networks<\/b><\/strong>: 2PE coatings for DN\u2264300 pipes (40% cost reduction)<\/p>

6.2 Technical Limitations<\/b><\/strong><\/span><\/h4>

Thickness control<\/b><\/strong>: Incompatible with overlap zones in spiral application<\/p>

Testing duration<\/b><\/strong>: 2,400h thermal aging test impractical for QC<\/p>

Environmental gaps<\/b><\/strong>: No VOC\/heavy metal restrictions<\/p>

Adhesive metrics<\/b><\/strong>: Missing tensile strength\/elongation criteria<\/p>

7. Technical Legacy & Evolution<\/b><\/strong><\/span><\/h3>

SY\/T 0413-2002 laid the foundation for China\u2019s modern pipeline coating systems by:<\/p>

Establishing\u00a0material\/process benchmarks<\/b><\/strong>\u00a0for 2PE\/3PE coatings<\/p>

Reducing corrosion failures by\u00a0~70%<\/b><\/strong>\u00a0during 2002\u20132010<\/p>

Enabling\u00a0localization<\/b><\/strong>\u00a0of PE\/epoxy materials (50% cost reduction by 2005)<\/p>

Advancements<\/b><\/strong>:<\/p>

Smart coatings<\/b><\/strong>: Embedded sensors for real-time monitoring<\/p>

Self-healing systems<\/b><\/strong>: Microcapsule-based damage repair<\/p>

Eco-formulations<\/b><\/strong>: VOC-free adhesives, recycled PE<\/p>

Guidance<\/b><\/strong>:<\/p>

For in-service pipelines coated per SY\/T 0413:<\/p>

Monitor thermal aging (MFR change \u226435%)<\/p>

Verify cathodic protection compatibility<\/p>

Replace field joints after 15 years<\/p>

New projects should adopt GB\/T 23257-2017.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n \n \n <\/i> <\/span>\n \n\t\t\tVoir tous les produits<\/span>\n\n \n \n <\/span><\/a><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\"3pe-tube-acier\"<\/a>