   All slings and hardware used for lifting must be load rated. Slings and other hardware may not be used to lift more than their rated capacity. Since ratings may be given in pounds or tons, it's important to know that 1 ton = 2000 pounds and to be able to convert units. Slings must have an identification tag indicating the maximum lifting capacity. Slings or other lifting components may not be used if the tag is missing or unreadable. Slings may not be used if damaged. If a sling is reparied it must be load tested before being put back into service. The capacity may need to be derated depending upon the lifing applicaion. Derating of slings well be discussed later.
A single leg wire rope sling will have a tag similar to this:
This sling is rated in tons. The tag gives the rating for the sling as 1.4 tons if used vertical to the load, 1.1 tons if used in a choker configuration, and 2.9 tons if used in a basket configuration.
A single leg nylon sling will have a tag similar to this:
This sling is rated in pounds. The tag gives the rating for the sling as 3200 pounds if used vertical to the load, 2500 pounds if used in a choker configuration, and 6400 pounds if used in a basket configuration.
A clevis will be marked similar to this:
This is rated in tons as indicated by the T. The marking gives the working load limit (WLL) rating for this clevis as 7 tons. |