Project Overview

In 2025, Dongqi Crane successfully designed, manufactured, and delivered two state-of-the-art QDX Series European Double Girder Overhead Cranes to a manufacturing factory in Nigeria. These cranes were customized for operation in a hazardous environment, featuring specific explosion-proof protections to ensure safety and reliability.

The client’s core requirements were:

• Model: QDX Double Girder Overhead Crane
• Capacity: 15 Ton
• Span: 13 Meter
• Lifting Height: 8.95 Meter
• Power Supply: 400V, 50Hz, 3-Phase
• Quantity: 2 Units
• Explosion-Proof Rating: Ex II 2 G Ex de IIC T4

The Product: QDX Double Girder European Bridge Crane

The QDX series represents the latest generation of overhead cranes, combining advanced European design concepts with robust manufacturing standards . Key features of this series include:

• Compact & Lightweight Design: The cranes are engineered with a tight structure and light dead weight, which helps reduce the wheel pressure and overall construction cost of the customer’s factory building .
• High Performance & Reliability: Equipped with a sophisticated lifting mechanism and a closed hard tooth surface deceleration system, the QDX crane ensures smooth transmission, low noise, and high load capacity for long-term, reliable operation .
• Modular & Customizable: The crane’s modular design allows for extensive customization to meet specific client needs, just as it did for this Nigerian project .

Focus on Safety: Explosion-Proof Capabilities

The Ex II 2 G Ex de IIC T4 certification is a critical aspect of this delivery, indicating that the cranes are built for environments where explosive gas atmospheres may be present .

To achieve this, Dongqi Crane integrated several key explosion-proof features:

• Flameproof Enclosure (Ex d): Electrical components like motors and brakes are housed within special enclosures designed to contain any internal explosion without igniting the surrounding atmosphere .
• Increased Safety (Ex e): Additional measures are applied to electrical equipment to prevent the possibility of excessive temperatures and the occurrence of arcs or sparks during normal operation .
• High-Grade Protection: All electrical enclosures boast a minimum protection class of IP55, safeguarding against dust and water ingress, which is essential for both safety and durability in harsh industrial environments .

Rigorous Pre-Delivery Testing

Before shipment, both cranes underwent Dongqi Crane’s stringent load testing procedures to verify performance and safety, in compliance with international standards like OSHA .

The testing process included:

• Visual Inspection: A thorough check of all structural elements, runways, and electrical systems.
• Load Testing: The cranes were subjected to both rated load and proof load tests (up to 125% of the rated capacity) to validate the structural integrity and performance of the hoisting and traveling mechanisms .
• Functionality Checks: All crane functions—including hoisting, trolley travel, and bridge travel—were operated at appropriate speeds to ensure smooth and safe control under load .

Factory load testing of the 15T QDX crane for the Nigerian project.

Conclusion

The successful delivery of these two explosion-proof cranes underscores Dongqi Crane’s commitment to providing safe, reliable, and customized lifting solutions for global clients. By choosing the QDX model with specific explosion-proof ratings, our client in Nigeria has equipped its facility with a system that not only enhances material handling efficiency but also prioritizes the highest standards of operational safety in a hazardous environment.

Dongqi Crane looks forward to continuing to support industrial growth in Nigeria and across the globe with our high-quality overhead crane solutions.

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📹 Watch the Crane in Action

Below is a video from our testing facility, showing the 15T QDX crane undergoing functional and load tests before dispatch.