Tubular Steel Tower For Wind Turbine
The Tubular Steel Tower is the most widely utilized support structure in the global wind energy industry, commanding over 90% of the market share. It consists of multiple conical steel sections manufactured in a factory and bolted together at the project site.
Core Function: It supports the nacelle and rotor blades at the required hub height while absorbing and transferring dynamic loads-such as torque, bending moments, and axial pressure-to the foundation.
Key Material: High-strength, low-alloy structural steel (typically S355NL/ML) known for excellent impact toughness at low temperatures and superior weldability.
Data Highlights:
Height Range: Typically 80m–120m for onshore; 140m+ for offshore.
Weight Proportion: Accounts for 60%–70% of the total turbine weight (excluding foundation).
Cost Factor: Represents approximately 15%–20% of the total wind farm CAPEX.
Tubular Steel Tower Specifications
| Parameter | Technical Description |
| Steel Grades | S355J2+N, S355NL, S355ML (per EN 10025 standards) |
| Design Standards | IEC 61400-1, Eurocode 3, GL Guidelines |
| Height Capacity | 50m to 160m (customizable) |
| Max Diameter | Onshore: ~4.5m (logistics limited); Offshore: Up to 8m+ |
| Plate Thickness | 10mm (top) to 80mm+ (base) |
| Section Length | Typically 20m to 35m per section |
| Design Life | 25 to 30 years |
| Operating Temp | -40°C to +50°C |
Structural Components (Structural Design)
A wind tower is a highly engineered system comprising several critical elements:
Conical Shells: The tower body uses a tapered design (wider at the base) to optimize stress distribution and minimize material usage.
Flanges: Located at both ends of each section, these are made of high-strength forged steel. Common designs include L-type or T-type flanges connected via high-tension bolts.
Tower Internals:
Ladders/Service Lifts: Provides access for maintenance personnel.
Platforms: Resting platforms and cable support levels.
Cable Brackets: Secure the power cables descending from the generator.
Safety Systems: Fall arrest rails and aviation obstacle lighting.
Door Frame: A reinforced opening at the base for entry, designed to compensate for the structural strength lost by cutting the shell.
Manufacturing Process
The production of wind towers involves heavy-duty automated machinery and precision engineering:
Plate Cutting & Beveling: CNC plasma or flame cutting machines cut steel plates to size and prepare edges (beveling) for welding.
Rolling: Large 3-roll or 4-roll bending machines cold-form the flat plates into conical or cylindrical segments.
Longitudinal Welding: Submerged Arc Welding (SAW) is used to join the seams of a single shell.
Circumferential Welding: Multiple shells are welded together to form a complete tower section.
Flange Welding: The forged flanges are welded to the tower sections. This is the most critical welding stage requiring extreme precision.
Internal Component Welding: Brackets for platforms and ladders are welded inside the shell.
Surface Preparation: Steel grit blasting to reach Sa 2.5 cleanliness standard.
Coating Application: Multi-layer spray painting for long-term protection.
Quality Control & Test Equipment
Quality assurance is mandatory, with 100% inspection of critical welds:
Non-Destructive Testing (NDT):
UT (Ultrasonic Testing): To detect internal weld defects.
MT (Magnetic Particle Testing): To find surface or near-surface cracks.
PT (Dye Penetrant Testing): For auxiliary surface defect inspection.
RT (Radiographic Testing): X-ray imaging for critical joints.
Geometric Measurement:
Laser Tracker: Used for high-precision measurement of flange flatness, tower verticality, and diameter tolerances.
Total Station: For overall geometric positioning.
Coating Inspection:
DFT (Dry Film Thickness) Gauge: Ensures paint thickness meets specs.
Adhesion Tester: Ensures the coating will not peel under stress.
Holiday Detector: Detects pinholes or "holidays" in the coating.
Anti-Corrosion Coating System
Towers must survive 25+ years in harsh environments (especially C5-M offshore conditions):
Typical 3-Layer System (ISO 12944 - C5 Standard):
Primer: Zinc-rich Epoxy. Provides electrochemical (galvanic) protection against rust.
Intermediate Coat: High-build Epoxy with Micaceous Iron Oxide (MIO). Acts as a physical barrier against moisture and oxygen.
Top Coat: Aliphatic Polyurethane. Provides excellent UV resistance, color retention, and weathering protection.
Total Thickness Requirements:
Onshore: Approximately 320μm - 360μm.
Offshore (C5-M): Usually exceeds 400μm.
Standard Colors: RAL 7035 (Light Grey) or RAL 9010 (Pure White).
GNEE Tubular Steel Tower
FAQ
Q1: What international standards do your wind towers comply with?
A: Our towers are designed and manufactured in strict accordance with international standards, including IEC 61400 (Design requirements), EN 10025 (Hot rolled products of structural steels), Eurocode 3 (Design of steel structures), and AWS D1.1 or EN ISO 5817 for welding quality.
Q2: How are the tower sections protected during long-distance sea transit?
A: We use Heavy-duty Steel or Airtight Wooden End Covers to seal both ends of each section. This prevents salt spray and moisture from entering the tower and protects the precision-machined flange faces. The external coating is protected by rubber-padded shipping saddles.
Q3: What is the expected maintenance-free life of the coating?
A: Our coating systems are designed to be maintenance-free for 20 to 25 years under normal operating conditions, protecting the structural steel from corrosion and UV degradation.
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