Sling Types and Load Distribution Flashcards

When using a two-leg bridle sling at a 60-degree angle from horizontal, the tension in each leg compared to a vertical hitch is approximately:

Answer: 1.15 times the load per leg

At 60 degrees from horizontal, the tension factor is approximately 1.15, so each leg carries slightly more than the load divided by two.

A wire rope sling with a kinked or birdcaged section should be:

Answer: Removed from service immediately

Kinked or birdcaged wire rope slings are permanently damaged and must be removed from service because their rated capacity is significantly compromised.

Which sling type is most susceptible to damage from ultraviolet (UV) light exposure?

Answer: Synthetic web slings

Synthetic web slings made from nylon or polyester degrade when exposed to prolonged UV light, weakening the fibers and reducing rated capacity.

When a load is lifted with an unbalanced center of gravity using a single vertical hitch, the risk is:

Answer: Load tipping or swinging uncontrollably

A single vertical hitch on an off-center load will cause the load to tip or swing because it cannot resist rotational forces.

The D/d ratio for wire rope slings refers to:

Answer: Bend radius of the fitting divided by wire rope diameter

The D/d ratio is the diameter of curvature (bend) divided by the wire rope diameter; lower ratios cause efficiency loss and must meet minimum requirements.

A choker hitch reduces a wire rope sling's rated capacity by approximately how much compared to a vertical hitch?

Answer: 25%

A choker hitch typically reduces capacity to 75–80% of the vertical hitch rating, roughly a 20–25% reduction, due to the bend stress at the choke point.

What is the purpose of a spreader bar when used with multiple slings?

Answer: To keep slings vertical and reduce compressive forces on the load

A spreader bar maintains the slings in a more vertical position, reducing sling tension and preventing inward compressive forces that could damage the load.