GB/T 39480-2020 in English

Definition of the scope of application

This standard applies to wire rope slings for general lifting, and explicitly excludes special lifting and heavy cable lifting scenarios. According to Chapter 1 of the standard, other types of rigging can be implemented by reference but are not mandatory.

Chapter 4 of the standard specifies 5 hanging methods in detail:

1. Slip-through knot method: single-limb load needs to be reduced by 20%, and the loop angle is ≤120°
2. Double-loop slip-through method: suitable for loose loads such as tube bundles
3. Basket knot method: the load can be increased to 2.1 times when two limbs are used

According to Chapter 5 of the standard, a full life cycle file must be established, including:

• Inspection records before each use
• Environmental temperature monitoring data
• Lubricant replacement cycle

Relative humidity should be maintained at ≤60% during storage, and the axle packaging should be rotated regularly.

1. For special scenarios such as offshore operations, it is recommended to:

• Increase the frequency of monthly non-destructive testing
• Configure the proportion of spare rigging ≥20%

2. Under high temperature conditions, refer to Appendix A for Load factor correction:

When 200-300℃, the steel core sling maintains 90% of the rated load