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The Question & Answer (Q&A) Knowledge Managenet

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Table of Contents

- How high does a ceiling need to be for a mezzanine?
- How do you calculate sling load?
- What are the three basic types of slings?
- What is the difference between SWL and WLL?
- What is sling angle?
- What is the minimum recommended sling angle?
- How do you find sling stress angle?
- How do sling angles affect the lifting capacity?
- When the legs of a sling are at an angle the lifting capacity is?
- What is the minimum grade of chain required for chain slings?
- What is the minimum design factor for wire rope slings?

14 feet

Take the total weight of the **load** and divide this by the number of legs supporting the **load**. For example, assume a 2,000 pound **load** is to be supported by 2 legs of a **sling**. The above will give a total minimum weight on each leg of the **sling** of 2,000 pounds divided by 2 legs or 1,000 pounds.

**What types of slings are used to lift loads?**

- Wire rope
**slings**. - Fibre rope
**slings**. - Chain
**slings**. - Synthetic web
**slings**. - Metal mesh
**slings**.

**WLL** vs **SWL** “**WLL**” stands for “working load limit” while “**SWL**” stands for “**safe working load**.” The main **differences between safe working load** from working load limit is that “**SWL**” is the older term. … Let us discover the reasons why engineers put an end to using the term “**safe working load**.”

**Sling Angle** is the **angle** measured between the horizontal plane and the **sling** leg or body. … The **angle** is very important and can have a dramatic effect on the rated capacity, due to the increase of tension caused by the **angle**.

Lifting Weight [LW] x the Tension Factor [TF] = **Minimum Sling** Rating for the type of hitch that will be used. * Measured from a common horizontal plane to the hoisting hook. **Sling** capacity decreases as the **angle** from horizontal decreases. **Sling angles** of less than 30° are not **recommended**.

The user must first **determine** the **angle** and multiply the load weight by the tension factor for the specific **angle**. The result is the INCREASED TENSION or actual loading on the **sling** leg(s). Multiply the load weight by the tension factor to **determine** the loading on the **sling** leg(s).

Using **slings** at an **angle can** become deadly if that **angle** is not taken into consideration when selecting the **sling to** be used. The tension on each leg of the **sling** is increased as the **angle** of **sling**, from horizontal, decreases. It is most desirable for a **sling to** have a larger **angle** of **lift**, approaching 90-degrees.

The **capacity** of the **sling** in this hitch is twice that of the same **sling** in a vertical hitch, but only if the **sling angle** of each **leg** is 90° (see right). **Lifting** with both **legs** at 90° would normally require two **lifting** devices or a spreader bar. at an **angle** during a **lift** , the **sling capacity** is reduced.

Steel **chain slings** are regulated under the MIOSHA Part 49 **Slings**. Only alloy steel **chain**, **grade** 80 or 100 is to be used for overhead lifting.

Design factors

Item | Component | Minimum design factor |
---|---|---|

9 | Chain fittings | 4 |

10 | Wire rope sling fittings | 5 |

11 | Other fittings | as specified by manufacturer |

12 | Non-rotating wire rope | as specified by manufacturer but not less than 5 |