- Jun 20, 2025
- Case Studies
15-ton QDX Bridge Crane for Steelworks Warehouse in Pakistan
Looking for a reliable 15-ton double girder overhead crane? Perfect for steelworks and warehouses, this crane boosts efficiency and safety. Check it out now!
A significant steel service center in Pakistan produces and distributes heavy steel plates, coils, and structural sections for construction and shipbuilding. Its warehouse spans thousands of square meters and can accommodate a wide range of heavy-duty steel goods. Handling these large materials requires strong overhead lifting systems. The customer needed a reliable 15ton QDX double girder overhead crane with a 15ton NR-type electric wire rope hoist and specialized lifting attachments to handle coils, plates, and cut-to-length bundles in their warehouse.
Customer's Crane Need: 15Ton QDX Double Girder Overhead Crane Requirements
The steel service center requires a strong overhead lifting system to securely and efficiently handle a wide range of heavy products. Their previous equipment lacked the throughput and flexibility required for current coil, plate, and structural processing. To optimize operations, they need a 15-ton crane with the following features:
1. Rated Capacity
The new crane must lift at least 15 tonnes to handle the biggest bundled loads, including entire 10 tonnes steel coils and 15 tonnes cut-to-length plate bundles for clients. A 125% proof test ensures safe operation of the hoist and bridge structure at peak demand.
2. Span and Lift Height
The crane's 15-meter girder span allows it to reach deep into storage racks and unload across large areas. A 10m underhook clearance allows for high-stacked coils and plates to be cleared without blocking gantry walkways or forklift lanes. With this span-height combination, the crane can serve both rail-side unloading and warehouse retrieval zones.
3. Double‑Girder Strength
The duplex bridge girders support a heavy-duty trolley with various lifting attachments. Within minutes, operators can switch between a hydraulic coil grab, mechanical plate clamps, and a spreader beam. The stiff double-girder design reduces deflection under side-load circumstances, ensuring tools operate within their specified specifications.
4. High Cycle Reliability
With two shifts and up to 80 lifts per day, the crane requires components rated for ISOM6/FEM3m service. Sealed bearings, heat-treated gears, and maintenance-free brake components ensure constant performance and save downtime.
5. Safety and Precision
Operators may precisely arrange large bundles on conveyors or trailers with a positioning precision of ±30mm. Safety interlocks, including overload protection, upper/lower travel limits, and anti-collision sensors, automatically halt motion if any parameters exceed safe limits. This multilayer safety method protects both personnel and payloads, resulting in steady throughput and timely deliveries.
Problems Faced Before Installing the 15 Ton QDX Double Girder Overhead Crane
Before constructing the 15-ton QDX double-girder overhead crane, the institution used several inefficient, hazardous, and costly lifting methods. These temporary solutions resulted in higher equipment wear, and compromised precision handling—all of which the new crane was designed to address.
1. Overreliance on Forklifts and Mobile Cranes
The facility used 25-ton forklifts and rented mobile cranes to carry large steel coils and plate bundles. Operating forklifts under piled goods poses a significant risk of tip-overs and crushing injuries. Meanwhile, every time a mobile crane arrived, production lanes had to be cleared, which halted traffic and increased the risk of collisions with vehicles or racking systems. In addition, due to the poor precision of forklift handling, frequent load increases are required.
2. Inadequate Single‑Girder Crane Coverage
The storage bay's old 10-ton single-girder crane couldn't reach far rack rows or carry bigger 12-ton coil bundles. The trolley's single-beam design limited headroom and required lowering the hook dangerously near to the girders to clear overhanging objects. Under large loads, the girder deflected up to 35mm at mid-span, exceeding allowable tolerances and jeopardizing safety and load control.
3. High Maintenance and Downtime
The 10-ton crane's mechanical brakes and chain hoists have to be serviced every 300 hours of operation. The facility lost an average of 12 hours per week due to equipment downtime, including routine maintenance for forklifts. These disruptions slowed order fulfillment, lowered consumer satisfaction, and increased labor and rental costs. The cumulative effect highlighted the necessity for a reliable and low-maintenance lifting solution.
Design of the 15Ton QDX Double Girder Overhead Crane Provided
This 15-ton QDX double girder overhead crane is designed for buyers who need reliable lifting in industrial workshops and warehouses. The design focuses on strength, safety, and efficient use of space. Every component works together to deliver stable performance and long service life. The crane suits daily production needs where loads are lifted frequently and positioning accuracy matters. It also fits well into buildings with limited height, helping you make the most of your existing facility.
1. QDX Double Girder Crane Structural Design
This 15-ton QDX double girder overhead crane is designed for buyers who need reliable lifting in industrial workshops and warehouses. The design focuses on strength, safety, and efficient use of space. Every component works together to deliver stable performance and long service life. The crane suits daily production needs where loads are lifted frequently and positioning accuracy matters. It also fits well into buildings with limited height, helping you make the most of your existing facility.
2. QDX Double Girder Crane Structural Design
The QDX double girder overhead crane uses two parallel box girders made from high-strength Q345B steel plates to ensure excellent load-bearing capacity and long-term durability. With a 15-meter span between runway rails, the 500 mm deep box-section girders form a rigid, torsion-resistant structure that stays stable during lifting and travel. The crane meets FEM 2m duty class requirements, making it suitable for moderate shock loads and frequent operation. Each end truck runs on four monolithic forged steel wheels with HRC58 hardness, which helps reduce rail wear and lowers maintenance costs over time.
3. 15 Ton NR-Type Electric Wire Rope Hoist Integration
The 15-ton NR-type electric wire rope hoist is mounted on a strong duplex trolley frame that can support different lifting attachments if your process requires flexibility. Dual lifting speeds of 4 m/min and 0.4 m/min allow fast lifting for productivity and slow speed for precise load positioning. The Ø28 mm wire rope, made with 1960 N/mm² strength and a 6×36 FC construction, delivers high fatigue resistance and can exceed 15,000 load cycles before replacement under normal conditions. A DC spring-applied disc brake limits hook creep to just 0.5 mm at full load, giving you confidence during suspended operations. The electronic overload limiter gives a strong warning of the first overload and immediately cuts off power if the overload persists, helping you avoid unsafe lifting operations.
Performance of the 15Ton QDX Double Girder Crane in Steelworks Warehouse
Before installing the 15-ton QDX double-girder crane, the warehouse relied on forklifts, mobile jib cranes, single girder crane, which failed to meet increasing throughput demands. Cycle times were long, placement accuracy was inconsistent, and equipment malfunctions were common. The QDX crane, intended for heavy-duty, high-cycle activities, has revolutionized material handling in critical workflows.
1. High‑Volume Coil Handling
Steel coils weighing up to 10 tons arrive on railcars, requiring swift transfer and precise placing. The QDX crane uses a fast-speed hoist (6m/min) for bulk movement and a slow-speed mode (0.4m/min) for precise positioning. with a hydraulic coil grab, workers can lift, rotate for barcode scanning, and rack each coil in 3 minutes, compared to 15 minutes with forklifts and mobile jibs. This fourfold speed increase clears the inbound rail bay and increases production feed-in.
2. Efficient Plate Bundle Storage and Retrieval
A magnetic lifter attachment can handle plate bundles weighing up to 5 tonnes, eliminating the need for manual slings. The crane's 10m underhook height and 15m spread accommodate the complete rack array, avoiding the need for additional stacker cranes. Retrieval cycle time decreased by 60%, from 10 minutes per bundle to 4 minutes, resulting in faster inventory rotation and shorter order fulfillment lead times.
3. Safe Handling of Custom Fabricated Assemblies
Using the adjustable lifting beam, operators now lift 15tonne welded frames directly from fabrication jigs to painting booths. Dual sling points and precise positioning reduce stress on weld seams. This capability replaced a time‑consuming tandem crane approach.
4. Increased Throughput and Reduced Downtime
Deploying two QDX cranes on alternating shifts increased overall material handling capacity by 45%. Real-time monitoring of vibration, temperature, and lubrication status is possible with sealed-for-life roller bearings and an onboard condition monitoring system. Early alarms allow maintenance staff to repair wear before it causes problems, increasing crane availability to 98%—up from 85% with the old lifting equipment.
Advantages of 15 Ton QDX Double Girder Overhead Crane
1. Compact Dimensions and Reduced Headroom
The QDX double‑girder crane uses a welded box‑section main beam and low‑profile hoist trolley. This cuts the distance from hook to runway. It lets you fit taller lifts in the same building height. A smaller headroom requirement can reduce the cost of workshop construction and HVAC.
2. Light Dead Weight and Lower Wheel Load
The optimized girder profile and high‑strength steel (Q235B or optional Q345B) trim the crane's own mass. Wheel pressures fall by up to 15 percent versus traditional designs. You save on runway beam size and foundation loads. Less rail wear also means fewer track replacements over the crane's life.
3. Higher Lifting Capacity and Increased Height
The dual‑girder layout supports heavier loads—up to 80 ton in standard QDX models—and spans beyond 30 meters. Placing the hook between two girders raises maximum hook travel. You gain several meters of extra lift height without altering building roof lines.
4. Smooth, Stable Handling
Frequency‑controlled drives on both crane and trolley provide stepless speed adjustment. Dual‑speed hoisting motors ensure safe, precise starts and stops. The result is minimal load sway and consistent travel under full load. This reduces handling errors and product damage.
5. Modular Design and Simplified Maintenance
Main girders, end carriages, and hoist modules bolt together. Spare parts interchange across the QDX range. Critical components—motors, gearboxes, brakes—are pre‑lubricated and rated for long service life. Scheduled inspections and part swaps take hours, not days.
6. Comprehensive Safety Features
Standard protections include overload limiters, upper/lower travel stops, and end‑of‑travel buffers. Electric cabinets use Schneider contactors and offer phase‑loss, over‑current, and no‑voltage safeguards. This multi‑layered approach prevents overload events and uncontrolled travel.
7. Energy Efficiency
A lighter bridge reduces inertial loads during start‑stop cycles. Variable‑frequency drives on hoisting and travel motors cut peak power draw. Regenerative braking returns energy to your facility grid during deceleration. The combined effect lowers operating costs over the crane's lifetime.
8. Flexible Customization
QDX cranes support capacities from 5 to 80 ton, spans from 7.5 to 31.5 m, and lifting heights up to 50 m. You can choose pendant, remote, or cabin control. Optional add‑ons include anti‑sway devices, automatic positioning, and load‑monitoring systems. This lets you tailor the crane to your plant layout and workflow needs.
Yuantai 15 Ton Bridge Crane
Conclusion
The 15ton QDX double girder overhead crane with NR‑type electric wire rope hoist and specialized transformed operations at the steelworks warehouse. By meeting the customer's need for high capacity, precise control, and versatile load attachments. Its robust design, low maintenance requirements, and compliance with international standards make it suitable for a wide range of heavy industrial applications—from shipyards to power plant maintenance. Organizations seeking a reliable overhead lifting solution for heavy materials can trust Yuantai's engineered crane systems to boost productivity and reduce operating costs.
