Safe use of the chain:

1. When operating the lifting chain, the nominal quality grade of the lifting chain shall be the same as that of the chain used;

2. Before the use of chain sling, the static load test should be carried out with twice the limit working load of a single limb first. During the test, the sling should be suspended for 10min without damage or obvious elongation of some links.

3. When the heavy objects are being hoisted by multi-limb lifting chains (belts), the clamping force on the heavy objects will increase with the increase of the included Angle between the lifting chains (belts). When the strength and toughness of the heavy objects are too low to bear the excessive clamping force, the included Angle between the lifting chains (belts) should be reduced as far as possible, so as to avoid the breakage caused by excessive clamping force on the objects being hoisted.(Picture 1)

(Picture 1)

4. The level of lifting auxiliary components shall not be lower than that of ring chain.

5. It is forbidden to use non-normal connecting parts between the chains (sling).(Figure II)

(picture 2)

6. The heavy objects should be hung at the bottom of the hook slot, and should not be hung at the source of the hook point. Under normal circumstances, when lifting heavy objects, the hook mouth should be hanging outward. (Picture 3)

(Picture 3)

7. The bearing ring chain (sling) is prohibited to be directly hung on the hook tip of the lifting machinery hook or wound on the hook.(Picture 4)

(Picture 4)

8. When lifting heavy objects, the lifting, dropping a