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Double Circuit Transmission Tower

Our Double Circuit Transmission Towers are high-capacity, hot-dip galvanized steel lattice structures engineered to carry two independent three-phase electrical circuits (six phase conductors) plus overhead shield wires or OPGW on a single alignment. This design maximizes power corridor capacity, significantly reduces right-of-way (ROW) land requirements, and provides substantial cost savings per megawatt (MW) transmitted for grid expansion, utility integration, and bulk power evacuation.

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Product Overview

Technical Specifications

Voltage Level	35kV / 66kV / 110kV / 220kV / 330kV / 500kV
Tower Configuration	Double Circuit Vertical, Broken-Stair, or Compact Geometry
Tower Functional Types	Suspension, Tension / Angle, Dead-End / Terminal, Transposition
Structural Material	High-strength structural steel Q235B / Q355B / Q420B (Equivalent to ASTM A36 / A572 / GR50 / GR65)
Anti-Corrosion Standard	Hot-dip galvanizing strictly compliant with ISO 1461 / ASTM A123
Zinc Coating Thickness	86 um - 120 um (Customizable up to 150 um for coastal and highly corrosive environments)
Design Wind Load	25 m/s up to 55 m/s (Customized per regional meteorological data)
Ice Loading Capacity	5 mm - 40 mm
Fasteners and Hardware	High-strength bolts and nuts (Grade 8.8 / 10.9) with heavy-duty locking devices
Foundation Compatibility	Heavy-duty pad-and-chimney concrete, Grillage, Rock anchor, Bored pile foundations
Design Life	More than 50 years under standard environmental conditions
Compliance Standards	IEC 60826, IEEE 524, ASCE 10, EN 1993 (Eurocode 3)

Engineering and Manufacturing Advantages

1. High-Precision CNC Fabrication
Zero-Error Field Assembly: Because double circuit towers are taller and carry much higher structural loads, our steel members are processed via automated CNC angle cutting, punching, and marking lines. Dimensional tolerances are strictly controlled within plus/minus 1mm, ensuring 100% bolt-hole alignment during field erection.
Raw Material Traceability: We source steel exclusively from Tier-1 state-owned mills. Every batch comes with an original Mill Test Certificate (MTC) matching EN 10204 3.1 standards for chemical composition and tensile strength.

2. 100% Factory Pre-Assembly Test
Shop-Fitting Verification: To prevent costly field delays and ensure the complex cross-arm geometries align perfectly, every new tower design undergoes a 100% full-scale prototype pre-assembly at our facility. Horizontal and vertical alignment, clearance angles, and splice joints are physically verified before mass production.

3. Advanced Structural Modeling for Double-Circuit Loading
Finite Element Analysis (FEA): Towers are analyzed using PLS-TOWER and MS Tower software. We simulate extreme combined-loading scenarios specifically critical to double circuit designs, including broken-conductor tension on one side, asymmetric ice dropping, and high-velocity wind buffeting, to optimize the strength-to-weight ratio.

4. Metallurgical Corrosion Protection
Industrial-Grade Galvanizing: All structural steel components undergo an acid-pickling and full-immersion hot-dip galvanizing process. The resulting zinc-iron alloy layers provide comprehensive, maintenance-free corrosion protection in desert, tropical, or high-salinity coastal zones.

Project Customization Capabilities

We tailor transmission line structures to match site-specific geological and environmental constraints:
Right-of-Way (ROW) Optimization: Compact vertical phase configurations designed to meet strict urban or forest corridor width limitations.
Terrain Adaptation: Custom tower heights (25m to over 90m) for long-span river crossings, mountainous terrains, and narrow right-of-way urban corridors.
Conductor and Shield Wire Optimization: Structural configuration optimized for bundled ACSR, AAAC, and seamless dual OPGW (Optical Ground Wire) integration.
Foundation Tailoring: Specialized leg extensions and stub designs to interface perfectly with local soil profiles, from soft swampland to solid rock anchors.

Quality Control and Verification Checklist

Our internal Quality Assurance (QA) program includes standard verification protocols for every shipment:
Non-Destructive Testing (NDT): Ultrasonic and magnetic particle inspection on all critical welded joints and heavy plate connections.
Coating Thickness Verification: Magnetic gauge testing across multiple reference points per member to guarantee uniform zinc coverage.
Mechanical Load Testing: Standard tensile testing for Grade 8.8/10.9 structural fasteners to confirm compliance with proof-load requirements.

Packaging, Marking and Logistics

Permanent Alphanumeric Stamping: Every single steel member is stamped with a permanent, unique identification code before galvanization. This code matches the structural erection drawings and packing list exactly, allowing local crews to sort parts instantly on-site.

Sea Freight Bundling: Components are tightly bundled using heavy-duty steel strapping and edge protectors to prevent zinc-coating friction during maritime transport. Bundles are pre-calculated to maximize standard 40ft HQ container or break-bulk vessel space utilization.

FAQ

Q: Why should an EPC choose a Double Circuit Tower over two Single Circuit Towers?

A:Double Circuit Towers carry twice the power capacity along a single corridor, reducing the required land footprint (Right-of-Way) by up to 40% to 50%. It significantly cuts down on overall foundation excavation, land acquisition costs, and long-term grid maintenance expenses.

Q: How do you guarantee that tower components won't misalign during on-site installation?

A:We mitigate this risk through automated CNC fabrication and mandatory prototype pre-assembly testing for each tower type before mass production. This ensures that hole spacing, connection angles, and splice tolerances are 100% accurate before leaving the factory.

Q: Can the zinc coating thickness be increased for highly corrosive environments?

A:Yes. While our standard galvanizing layer meets ISO 1461 (more than 86 um), we can deliver heavy-duty galvanizing up to 120-150 um for coastal, industrial, or high-humidity regions to maximize the tower's service life.

Q: Do you provide original material documentation for compliance audits?

A:Yes. Every shipment includes a complete quality dossier containing EN 10204 3.1 Mill Test Certificates (MTC), hot-dip galvanizing thickness reports, dimensional inspection certificates, and factory trial-assembly photo logs.

Q: How are the tower components packaged to prevent damage and loss during international shipping?

A:Components are securely bundled by part number using steel strapping with rubber padding to prevent zinc-to-zinc scratching. All small hardware, plates, and Grade 8.8/10.9 bolts are packed in heavy-duty, weather-resistant steel drums or reinforced wooden crates labeled with detailed packing lists.

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