Double Trolley Overhead Crane for Mexico Hydropower Plant: Anti-Corrosion Design

Core Procurement Requirements

• Lifting Operation Requirements: The equipment must meet the heavy-duty lifting conditions of a hydropower plant, adopting a double trolley configuration to ensure smooth and reliable operation for turbine and generator maintenance tasks.
• Parameter Requirements: Key specifications such as lifting capacity, span, and lifting height shall be customized according to project requirements and comply with Mexico’s 480V / 60Hz / 3Ph power supply standard. The control system shall ensure operational ease together with flexibility and precise load positioning.
• Operating Environment: The equipment shall be suitable for humid hydropower plant conditions in Mexico, with strong resistance to corrosion and moisture. Key components such as motors must meet the required protection rating to prevent moisture ingress and ensure long-term reliability.

Customized Solution

1. Customized Lifting Solution: Double Winch Trolley Design

• Winch trolley for heavy-duty applications: The winch trolley design provides higher load-bearing capacity, making it suitable for heavy-duty hydropower working conditions where precise load control is critical.
• Double trolley configuration: Each overhead crane is equipped with two independently operating trolleys. The auxiliary trolley can be used for turning operations during turbine component assembly and disassembly processes.
• Variable frequency speed control for smooth operation: Both hoisting and traveling mechanisms are equipped with VFD (variable frequency drive) control, ensuring smooth start-up and braking without impact. The system also provides precise positioning capability, improving operational efficiency and safety.
• Modular design for easy maintenance: The motor, reducer, and brake are designed in a separate modular layout, allowing each component to be serviced or replaced independently without disassembling the entire mechanism.
• Dedicated maintenance-friendly structure: The wire rope drum adopts an independent support design for individual disassembly and replacement. A dedicated maintenance platform provides safe and convenient access for routine inspection and servicing.

2. Technical Parameters: Fully Customized to Project Requirements

All dimensional, electrical, and operational parameters are precisely tailored and calibrated according to client specifications, with optimized control systems to ensure full compatibility with project requirements and local power standards in Mexico.

• Dimensional parameters: Both cranes are designed with customized span and lifting height to match the hydropower plant layout, with dual lifting capacities configured to meet the full range of heavy and light lifting needs during power plant operations.
• Voltage: The electrical system is designed in compliance with Mexico’s 480V / 60Hz / 3Ph power supply standard, enabling direct connection to the local power grid without additional modification and ensuring stable power operation.
• Operating speed and control mode: The operating speeds of each mechanism are properly configured to match the project’s lifting cycles. The control system adopts dual-mode pendant control and remote control, ensuring operational convenience and flexibility for different working scenarios within the hydropower plant.

3. Environmental Adaptation: Anti-Corrosion Design for Mexico Hydropower Conditions

To meet the environmental demands of the hydropower project site in Mexico, advanced surface anti-corrosion treatment and motor protection design were applied to enhance resistance against corrosion and moisture:

• Steel plate treatment: All steel plates are treated with Sa2.5-grade shot blasting, effectively removing surface oxide layers and impurities, providing a strong foundation for subsequent coating adhesion.
• Anti-corrosion coating system: The surface is coated with epoxy zinc-rich primer plus chlorinated rubber topcoat. Compared with conventional coatings, this system offers stronger corrosion resistance, effectively protecting the structure from humid environmental exposure and extending service life.
• High protection-class motors: The motors are designed with IP54 protection rating and Class F insulation. They offer excellent dust and moisture resistance, effectively preventing water vapor from entering the motor interior, reducing component damage risk, and ensuring stable operation in Mexico’s humid hydropower environment.

Delivery Results

• After contract signing, production and shipment preparation of the two customized QE double trolley double girder overhead cranes were completed within approximately two months.
• Operational efficiency and safety performance both met project expectations. The A5 duty classification configuration is well suited to hydropower plant working conditions.
• The electrical system is fully compatible with the local 480V / 60Hz / 3Ph power grid, ensuring stable operation. The anti-corrosion system of epoxy zinc-rich primer plus chlorinated rubber topcoat, combined with IP54-rated motors, enables the equipment to reliably adapt to Mexico’s hydropower operating environment.
• Client Mr. Victor Martinez highly recognized the customized design, product quality, and manufacturing workmanship. With extensive experience in crane export to the Americas, Suncan Crane provided full-process services covering design, production, and shipment, laying a solid foundation for on-site installation and long-term operation.