Round slings are a go-to choice for lifting and moving heavy loads, prized for their strength, flexibility, and safety. But with various options available, selecting and using the right one is key. This guide covers everything you need to know: from understanding different sling types and picking the right one, to crucial safety tips and maintenance advice.
What is a Round Sling?
A round sling is a type of lifting sling made from high-strength synthetic fibers. Compared to other slings like flat webbing slings or chain slings, round slings offer superior flexibility and conformability. They are uniquely designed to cradle and evenly distribute the load’s weight, making them an ideal choice for lifting objects that are irregularly shaped, have delicate surfaces, or are easily damaged.
Two Key Components
Core: The internal load-bearing element, made of parallel, high-strength synthetic yarns that provide the sling’s lifting strength.
Protective Sleeve: A durable woven sleeve that encases the core, shielding it from abrasion, cuts, UV rays, and chemicals to extend the sling’s lifespan.
Types of Round Slings
There are two types of round slings: Endless round sling(Circle sling) and Round sling with loop(Eye&Eye slings). They are built on the same principles of strength and protection, but differ significantly in design, application methods, and ideal use cases.
| Feature / Parameter | Endless Round Sling (Circle Sling) | Round Sling with Loop (Eyes & Eyes Sling) |
|---|---|---|
| Structural Diagram |  |  |
| Construction | Seamless continuous loop without separate end fittings. | Permanent sewn loops (eyes) at both ends. |
| Common Lifting Configurations | Basket hitch, choke hitch, vertical hitch (multiple uses with a single sling). | Vertical hitch, choke hitch (requires attachment through loops). |
| Length Definition | Refers to the full circumference of the loop. | Refers to the inside-to-inside distance between the two loops (effective lifting length). |
| Key Advantages | High Flexibility: One sling for multiple hitch types. Excellent Conformability: Greater contact area protects the load. No Weak Points: Continuous structure ensures even stress distribution. | Secure Connection: Loops provide defined attachment points for hooks or shackles. Fixed Length: Easy to plan and control lifting height. Easy Assembly: Simplifies connection to hardware or forming multi-leg sling systems. |
| Typical Applications | Lifting irregular, delicate, large, or surface-sensitive loads (e.g., pipes, plates, machinery). | Applications requiring precise length, fixed connection points, or assembly into lifting systems (e.g., with beams, in standardized lifting stations). |
| Selection Guidance | Choose when you need one sling to handle various load shapes with maximum flexibility and load protection. | Choose when you have defined connection points, require a specific length, or need to build a multi-leg lifting system. |
How to measure the length of a round sling?
Before taking any formal measurements, ensure the sling is in a completely relaxed and unloaded state.
After measurement, be sure to check the length markings on the permanent label on the sling itself to ensure they match.
Safe Use of Round Slings
The use of round slings must adhere to specific safety standards to prevent accidents during lifting operations.
Inspection and Maintenance
- Regular Inspection: Before each use, inspect the round sling for any visible signs of damage, wear, or elongation.
- Signs of Damage: If signs such as abrasion, cuts, burn marks, or chemical degradation are found, immediately discontinue use and replace the sling.
Proper Installation
- Ensure the round sling is correctly rigged. It must not be overstretched or used beyond its rated capacity. Always use appropriate lifting points and avoid contact with sharp edges.
Avoid Overloading
- Never exceed the safe working load (SWL) of the round sling. Before every lift, verify that the load weight matches the sling’s rated capacity.
Storage and Maintenance of Round Slings
Proper storage and maintenance practices can extend the service life of round slings and reduce the risk of failure.
Storage Requirements
- Avoid Direct Sunlight: Prolonged exposure to ultraviolet (UV) radiation can accelerate material degradation.
- Avoid Damp Environments: Moisture can lead to mold, mildew, or rot, compromising the sling’s strength.
- Avoid Compression: During storage, round slings should not be subjected to excessive pressure or crushing, which may cause deformation or damage.
Cleaning and Care
- Regular Cleaning: Clean round slings with clean water. Avoid using strong acids, alkalis, or harsh chemical cleaners.
- Dry Storage: After cleaning, ensure the sling is thoroughly dried and stored in a well-ventilated, dry area to prevent moisture retention.
Conclusion
Round slings are essential in lifting operations due to their flexibility, strength, and safety. Selecting the right sling improves efficiency and reduces risks. Always follow safety guidelines, inspect regularly, and maintain properly to ensure reliable performance. Proper storage and care extend their lifespan, cut costs, and enhance productivity.
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