- Jul 25, 2025
- Case Studies
16 Ton LD Overhead Crane to Pakistan Construction Site
Check out our 16 Ton LD Single Girder Overhead Crane, now at a construction site in Pakistan! Discover how this powerhouse boosts efficiency and safety in lifting tasks.
In modern construction sites, efficient handling of heavy building components is essential to maintain project schedules and budgets. Yuantai supplied a 16 ton LD (light‑duty) single girder overhead crane to a large urban construction project in Karachi, Pakistan. The crane was installed outdoors between two buildings. This case study introduces the customer's specific crane requirements, detailed design of the LD single girder crane provided, operational performance in diverse tasks, advantages of the solution, and potential applications in related industries.
16 Ton LD Single Girder Overhead Crane Product – Customer's Crane Need
At a high‑rise construction site, material flow must be tightly coordinated to avoid holdups. The customer needed an in‑shop lifting solution to move loads of up to 16 ton along a 12‑meter span inside a steel‑frame workshop adjacent to the tower crane pad. Key operational needs included:
- Frequent Lifting of Prefabricated Steel Beams: Steel beams up to 14m in length and weighing 10 – 16 ton arrive daily for drilling, welding, and coating.
- Handling of Concrete Formwork Panels: Formwork panels measuring up to 5m² and weighing 7 ton must be flipped and repositioned across workstations without manual slinging.
- Installation of Mechanical, Electrical, and Plumbing (MEP) Modules: HVAC duct sections, packaged at weights of 2 – 5 ton, require precise placement onto assembly fixtures for welding and sealing.
- Staging of Precast Concrete Elements: Wall panels and balcony slabs, averaging 8 ton each, need horizontal rotation and side‑loading for finishing operations.
The customer's prior approach relied on mobile forklifts and truck‑mounted cranes brought in by subcontractors. These methods suffered from site congestion, limited lift height, and required extensive rigging each time. An overhead crane solution inside the workshop promised faster cycle times, reduced labor, and safer handling.
Challenges Before Using 16 Ton LD Single Girder Overhead Crane Product
Before installing the Yuantai crane, the construction site faced several material‑handling challenges that impacted productivity and safety:
1. Inefficient Use of Mobile Lifting Equipment
Forklifts are designed for pallet handling, not wide steel beams. At the workshop, forklift operators struggled to center forks under long beams without side loads, leading to beam sway and occasional damage to painted surfaces. Each beam pickup took an average of 8 minutes for positioning and stabilization. After forklift transfer, subcontractor‑supplied truck cranes required 30 – 45 minutes of rigging and setup per lift. These sequential steps increased internal handling time by 250% compared to an integrated overhead system.
2. Site Congestion and Coordination Delays
Bringing in cranes through the gate, then maneuvering them inside the cramped compound, caused traffic bottlenecks. Trucks queued for up to two hours during peak delivery slots, awaiting crane availability. Coordination between delivery drivers, crane teams, and workshop staff often resulted in miscommunication and delays. According to industry data, such handling inefficiencies can reduce workflow efficiency by up to 20% in construction sites.
3. Safety and Compliance Concerns
Manual rigging of slings around irregular loads like formwork panels increased the risk of dropped loads. The site recorded two near‑miss incidents in the prior quarter, prompting an internal safety audit. OSHA standards (29 CFR 1910.179) require overhead crane systems to have reliable holding brakes, limit switches, and routine inspections to prevent overspeeding or uncontrolled load drops. Compliance using ad‑hoc mobile cranes and chain hoists proved difficult. The site sought a permanent overhead solution designed to meet or exceed those regulatory requirements.
16 Ton LD Single Girder Overhead Crane Product Design Provided by Yuantai
To meet the customer's needs, Yuantai engineered a 16 ton LD single girder overhead crane with the following design features:
1. Girder and Bridge Structure
The crane uses a U‑shaped welded box section girder fabricated from Q345B high‑strength steel. This girder spans 12 meters between runway rails and maintains minimal deflection under full load. The box profile provides superior torsional rigidity, supporting heavy lifting cycles while keeping the bridge weight low for reduced runway loads. End carriages use forged steel wheels heat‑treated to HRC 58 hardness, ensuring long service life on the workshop's rail profile (U50 kg rail).
2. Hoist and Trolley Mechanism
The crane features a 16-ton wire rope hoist with a two-speed motor configuration.The high-speed mode quickly raises empty or partially laden formwork panels, while the low-speed option provides accurate positioning for complete 16-ton steel beams.The hoist drum features a multi-groove design for even rope seating, saving premature wear by up to 30%.The trolley moves over the girder's bottom on four V-groove wheels with sealed bearings. A variable frequency drive (VFD) controls trolley motion, allowing for smooth starts and stops that reduce jerk and dynamic load on the structure.The maximum trolley speed is 20m/min in low-speed mode and 40m/min in high-speed mode.Braking is accomplished using a DC disc brake that engages immediately upon power loss, meeting OSHA holding brake regulations.
3. Power Supply and Control System
Power is provided via a festoon conductor bar system running along one side of the runway. The conductor bars feed a 415V, 50Hz supply to the trolley and hoist drives. ABB ACS550 VFDs manage both bridge travel and hoist functions. A Schneider Electric PLC coordinates motion sequencing, overload protection, and fault diagnostics. Operators use a pendant control with a dead‑man switch and an emergency‑stop button. For oversight, a wireless remote control option allows supervisors to position the load from the ground, improving visibility during asymmetrical lifts.
4. Safety and Monitoring Features
To protect personnel and equipment, the crane includes dual‑limit switches for bridge travel and hoist height. These switches prevent overrun and ensure loads remain within the safe working envelope. An electronic overload protection module monitors current draw on the hoist motor, locking out operation when loads exceed 110% of rated capacity. Anti‑collision sensors mounted on the carriage detect obstacles within a 500mm range, triggering automatic deceleration. A load‑moment indicator (LMI) displays real‑time load weight on the pendant, supporting compliance documentation and operator awareness.
Yuantai Single Girder Overhead Crane
1. Single Girder Overhead Crane
The Single Girder Overhead Crane is a simple, cost-effective lifting solution for light to medium loads. It uses one main beam (girder), with the hoist and trolley traveling along it. Because it uses less material and has a simpler structure, it costs less, installs faster, and is easier to maintain.
2. Suspension Overhead Crane
The Suspension (Ceiling-mounted) Overhead Crane is ideal if you want to free up floor space and avoid building special support columns. The crane's rail is secured to the ceiling structure, so the crane hangs from above — a good fit for workshops or warehouses where saving floor space matters.
3. LDP Single-Girder Low Headroom Bridge Crane
The LDP Single-Girder Low Headroom Bridge Crane is designed for facilities with limited ceiling height. It mounts the hoist to the side (or top) of the main girder instead of under it, which gives you more hook height while minimizing the building's required overhead clearance. It handles light to medium loads (e.g. 1–20 tons) and is ideal for low-ceiling workshops, assembly areas, or warehouses.
How the LD Single Girder Overhead Crane Handled Challenging Tasks
Since this crane was put into operation, the LD single girder overhead crane has performed a wide variety of tasks on the construction site:
1. Prefabricated Steel Beam Handling
Each morning, steel beams arrive in batches of eight. The crane hoist lifts beams weighing between 10 ton and 16 ton from staging pallets and transports them along the 12m span to the welding station. With the high‑speed hoist setting, beams move at 40 m/min, reducing transfer time from staged to weld fixture by 75%—from an average of 16 minutes to 4 minutes per beam. In low‑speed mode, the crane aligns beams within ±25mm of final position, eliminating manual re‑alignment and saving welding preparation time.
2. Concrete Formwork Panel Rotation and Transfer
Formwork panels loaded with fresh concrete weigh up to 7 ton each. The crane's two‑speed lifting function allows rapid travel to the demolding area. Once there, the operator uses the VFD's precise motion control to rotate the panel 180° for easy removal of concrete molds. This rotation and precise placement cycle takes under 3 minutes—compared to 12 minutes with mobile hoist rigs—accelerating the mold‑cleaning process and enabling higher daily output of 50 panels versus 20 previously.
2. MEP Module Assembly
HVAC duct sections and piping spools, packaged on skids weighing 2– 5 ton, require safe transport to assembly benches. The crane's pendant control provides fine‑tuned positioning, crucial when fitting pre‑cut holes and flanges. Operators report that awkward lifts at height—previously requiring scaffolds and manual pulling—now occur directly under the bridge, reducing rework and risk of damage to finished surfaces.
3. Precast Concrete Element Staging
Wall panels and balcony slabs, each weighing around 8 ton, are rotated and side‑loaded onto transport frames. The crane's ability to lift at angles via properly configured slings and spreader bars has improved staging accuracy. Average placement time per panel has decreased by 60%, enabling the tower cranes to pick up and install finished panels sooner and keep the structural timeline on schedule.
Advantages of the 16 Ton LD Single Girder Overhead Crane Product
The Yuantai crane solution offers multiple benefits that align with the customer's project goals:
1. Increased Productivity and Throughput
By eliminating the need for forklift staging and mobile crane rigging, the overhead crane reduces internal handling time by over 50%. Faster and more accurate lifts mean shop‑fabrication cycles complete earlier in the day, allowing tower cranes to continue raising structural elements without waiting for prefabrication to finish. This continuity can translate into savings of several weeks on a high‑rise schedule.
2. Enhanced Safety and Compliance
Replacing mobile hoists and forklifts in the workshop reduces collision risk in confined spaces. Integrated safety systems—overload protection, limit switches, anti‑collision sensors—ensure operations meet OSHA 1910.179 requirements. Since installation, the site has logged zero crane‑related safety incidents. Operators benefit from clear load‑weight feedback and standardized safety interlocks.
3. Simplified Maintenance and Lower Lifecycle Costs
The single girder design reduces part count and simplifies inspection. Routine checks—wheel wear, rope condition, brake function—are completed in under two hours per week. High‑quality components (ABB drives, Schneider PLC, HRC‑rated wheels) extend service intervals to 2 000 operating hours. Compared to a mix of rental equipment and mobile hoists, the integrated crane cuts annual material‑handling maintenance costs by an estimated 35%.
4. Energy Efficiency
Using VFD drives for both hoist and bridge motion minimizes inrush currents and allows regenerative braking during deceleration. This feature recovers up to 8% of consumed energy and returns it to the local power bus. Over the course of a typical month, this equates to savings of 500 kWh, reducing electricity expenses and supporting the site's sustainability targets.
Other Applications for the 16 Ton LD Single Girder Overhead Crane
The LD single girder overhead crane is a versatile lifting solution that works well beyond construction‑site assembly workshops. Its compact design, strong load capacity, and ease of installation make it suitable for a wide range of industrial environments. Whether you need to move heavy machinery, manage large shipments, or maintain complex equipment, this crane provides a safe and efficient way to handle materials while saving time and reducing manual effort.
1. Manufacturing and Fabrication Shops
In fabrication and manufacturing workshops, you often need to lift and position large machinery parts or subassemblies. The LD single girder crane allows you to move components like earth‑moving machinery, agricultural equipment, or industrial presses between stations with precision. Its smooth operation reduces handling risks, keeps production flowing, and allows you to focus on assembly and quality rather than worrying about heavy lifts.
2. Warehouse Distribution Centers
For warehouses handling bulky or heavy goods, maximizing space while keeping operations efficient is essential. The low‑headroom design of this crane allows you to make full use of vertical space, moving items such as steel coils, automotive frames, or timber pallets without relying solely on forklifts. This reduces congestion on the floor, improves safety, and helps you maintain a more organized and productive storage area.
3. Steel Service Centers
Steel service centers often manage heavy coils and cut‑to‑length bundles. A LD overhead crane is ideal for lifting most steel coils up to 4mm thick and 1500mm wide. Using a single girder crane here means you can handle coils quickly between cutting, rolling, and storage areas, minimizing delays and reducing the chance of damage during transfers. Its strength and precision make daily operations smoother and more reliable.
4. Maintenance Workshops in Power Plants
Power plants require frequent lifting of heavy equipment such as generators, turbine shafts and heat exchangers, which can weigh from a few tons to tens of tons. The single girder crane provides precise, controlled handling during maintenance or installation, helping you manage repeated lifts safely. Its presence in your workshop ensures that heavy components can be moved efficiently without putting extra strain on your team or risking costly downtime.
Conclusion
The deployment of a 16 ton LD single girder overhead crane at a Karachi construction site transformed material handling within the on‑site assembly workshop. By addressing lifting capacity, positional accuracy, safety, and energy efficiency, the crane solution eliminated delays and improved overall project flow. Its modular design, robust components, and integrated safety features ensure reliable performance in the demanding environment of high‑rise construction. Beyond this application, the crane's versatility makes it an effective tool for manufacturing, warehousing, steel processing, and maintenance operations where heavy loads must move quickly and safely.
