Double leg chain slings, also known as two-leg chain slings, consist of two chains connected to a common master link at the top and hooks or other lifting attachments at the ends. They are widely used in industries for hoisting and moving heavy loads. Here are the key aspects of double leg chain slings:

Components

1. Master Link: A single link at the top that connects to the lifting hook of a crane or hoist.
2. Chain Legs: Two chains of equal length that extend from the master link.
3. Hooks or Attachments: The bottom ends of the chain legs have hooks or other lifting attachments that secure the load.

Features

1. Increased Load Capacity: Double leg chain slings can handle heavier loads compared to single leg slings because the weight is distributed between two legs.
2. Versatility: Suitable for a wide range of lifting applications, including balanced and unbalanced loads.
3. Stability: Provides greater stability and control over the load during lifting operations.
4. Durability: Made from high-strength steel (Grade 100 is most common), these slings are durable and resistant to harsh working conditions, such as abrasion and high temperatures.

Applications

1. Construction: Used for lifting beams, pipes, concrete blocks, and other heavy construction materials.
2. Manufacturing: Essential in moving large machinery, equipment, and heavy parts within manufacturing plants.
3. Marine: Utilized for lifting heavy cargo and equipment on ships and docks.
4. Mining: Employed in handling heavy mining equipment and materials.

Types of Double Leg Chain Slings

1. Adjustable Chain Slings: Allow the length of the legs to be adjusted to suit different lifting requirements.
2. Fixed-Length Chain Slings: Have legs of fixed lengths, typically used for consistent lifting tasks.

Grades and Standards

Chain slings come in different grades, with Grade 100 being the most common for lifting applications. Grade 80 and Grade 120 chain slings also exist. These grades indicate the strength of the chain, with higher grades being stronger and more suitable for heavier loads.

Inspection and Maintenance

Regular inspection and maintenance are crucial for ensuring the safety and longevity of double leg chain slings. This includes:

• Visual Inspection: Checking for signs of wear, deformation, and corrosion on the chains and components.
• Functionality Check: Ensuring that hooks and master links are not damaged and are functioning correctly.
• Lubrication: Keep the chain properly lubricated (especially any mechanical fittings) to prevent rust and reduce friction.
• Load Testing: Periodic load testing to verify the integrity and strength of the sling.

Safety Considerations

1. Proper Use: Ensure the sling is used within its rated capacity and in accordance with manufacturer guidelines.
2. Angle of Lift: Be mindful of the angle between the legs, as this affects the sling’s load capacity. Smaller angles (such as 60 degrees) result in higher load capacities while sharper angles (such as 30 degrees) result in lower capacities..
3. Load Distribution: Distribute the load evenly between the two legs to avoid overloading one leg.
4. Training: Operators should be trained in the correct use and inspection of double leg chain slings.

Using double leg chain slings correctly and maintaining them well ensures safe and efficient lifting operations in various industrial settings.