Table of Contents

- 1 What is the capacity of 1 sling?
- 2 How do you calculate lifting sling capacity?
- 3 How do you calculate sling stress?
- 4 How much weight can a 5’8 cable hold?
- 5 What is the length of the sling?
- 6 What is the best sling angle?
- 7 When do slings need to be unequal in length?
- 8 What is the center of gravity of a sling?

## What is the capacity of 1 sling?

Wire Rope Load Limits

Single Leg Slings (Capacity – Tons) | Multiple Leg Slings (Capacity – Tons) | |
---|---|---|

Rope Dia. | 2 Legs | |

6 x 19 XIP IWRC | 1″ | 9.8 |

1-1/8″ | 12 | |

6 x 37 IWRC | 1-1/4″ | 15 |

## How do you calculate lifting sling capacity?

Steps to determine necessary sling capacity:

- Determine the weight that the sling will be lifting (LW)
- Calculate the Tension Factor (TF)
- Lifting Weight (LW) x the Tension Factor (TF) = Minimum Sling Rating for the type of hitch that will be used.

**What is the minimum recommended sling angle?**

30°

Sling capacity decreases as the angle from horizontal decreases. Sling angles of less than 30° are not recommended.

**What is the formula of load?**

Multiply the mass of the object by the gravitational acceleration of the earth (9.8 m/sec2), and the height in meters. This equation is the object at rest’s potential energy. Potential energy is measured in joules; this is the load force.

### How do you calculate sling stress?

- 1) Determine the Load Factor (LAF): Divide the leg length (L) by the headroom (H)
- 2) Determine the Share of the Load (SOL) for the individual sling legs: Divide the load weight by the number of sling legs.
- 3) Multiply Load Factor by the Share of the Load to determine Sling Tension.

### How much weight can a 5’8 cable hold?

MacWhyte. 7 X 19 Aircraft Cable | ||
---|---|---|

5/16″ | 1960 lbs | 1640 lbs |

3/8″ | 2880 lbs | 2360 lbs |

1/2″ | 4560 lbs | 4120 lbs |

5/8″ | 7000 lbs | 6440 lbs |

**What is chain sling?**

Single Leg Chain Sling is a length of chain with fittings on each end used for lifting in a vertical hitch.

**How is lifting capacity calculated?**

Measure geometric components

- The standard calculation for maximum crane capacity is (r)(hC)/100.
- R = Radius between the ground and load.
- hC = Lifting height multiplied by the capacity.

## What is the length of the sling?

SLING LENGTH is the minimum length of sling needed from the crane hook to the sling’s connection or contact point on the load. LOAD WIDTH (or length) is the distance between the load’s shackle (connection) points or load edges.

## What is the best sling angle?

60 degrees

Best practice is to have horizontal sling angles of 60 degrees or bigger to reduce sling tension and crushing forces on the load.

**How do I calculate my load weight?**

Calculating the Weight of a Load

- Step 1: Determine the Volume of the Load. Rectangle/Square: Volume = Length x Width x Height.
- Step 2: Determine the Material You’ll Be Lifting. The table below can be used for approximate weight values of common loads and materials:
- Step 3: Determine the Weight of Object.

**How to calculate the weight of a sling?**

Take the total weight of the load and divide this by the number of legs supporting the load. For example, assume a 2000 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 2000 pounds divided by 2 legs or 1000 pounds.

### When do slings need to be unequal in length?

While slight variations are usually permissible, if the crane hook is too far to one side of the center of gravity, dangerous tilting will result and should be corrected at once. For this reason, when the center of gravity is closer to one point of the sling attachment than to the other, the slings must be of unequal length.

### What is the center of gravity of a sling?

Angle of loading and load center of gravity. Diameter of curvature around which the sling is bent. The center of gravity of an object is a point around which the entire weight may be concentrated. To make a level lift, the crane hook or point of suspension must be directly above this point.

**Why does the angle of a sling vary?**

Because the angle of pull on the leg of a sling varies with the leg angle, forces may be exerted on a sling greater than the user may expect. Fell free to consult the sling angle factor chart.