Do You Have Basic Knowledge About Rigging?

If a wire rope shows evidence of heat damage, it is important to take it out of service completely. Heat damage can weaken the wire rope and make it more prone to failure, which can be extremely dangerous. Continuing to use the damaged wire rope could lead to accidents or injuries. Therefore, it is crucial to notify the supervisor about the issue and replace the wire rope with a new one to ensure safety.

The Basic Guidelines include three main points: never exceed the W.L.L. (Working Load Limit), always use a tag line, and never get under the load. These guidelines are important for ensuring safety and preventing accidents in lifting and rigging operations. By following all of these guidelines, workers can minimize the risk of overloading equipment, maintain control of the load, and avoid being in a dangerous position beneath the load.

Side loading a round pin shackle can cause it to fail under load. Round pin shackles are designed to be loaded in line with the pin, not at an angle. When a round pin shackle is side loaded, it puts stress on the pin and can cause it to bend or break. This can lead to catastrophic failure and potential injury or damage. It is important to always use shackles properly and follow manufacturer guidelines to ensure safety.

The correct answer is "All of the above." This means that all of the options listed (5 broken wires in one strand of a lay, 10 broken wires in one entire lay, kinking birdcaging or distortion of wire rope) are reasons to take the wire rope out of service.

The correct answer is 20:1. This means that the diameter to the depth ratio should be 20:1. This ratio indicates that the diameter of the object is 20 times larger than its depth.

Softeners are used to prevent damaging rigging and/or equipment. They provide a cushioning effect and help absorb shock or impact, reducing the risk of damage. By using softeners, the force or pressure applied to the rigging or equipment is distributed more evenly, preventing excessive stress or strain that could lead to damage. It is a common practice to use softeners in situations where there is a risk of damaging the rigging or equipment.

Kiewit's policy does not allow for chains to be used for general rigging.

When using a 2-part bridle, having a higher sling angle can result in more lifting capacity. This is because a higher sling angle increases the effective length of the sling legs, which in turn reduces the load on each individual leg. By distributing the load more evenly between the legs, the overall lifting capacity of the bridle is increased. Therefore, it is true that having a higher sling angle is better for maximizing lifting capacity when using a 2-part bridle.

The weight of the load can be estimated by considering the weight of each timber and multiplying it by the total number of timbers. Since the weight of each timber is not given, we cannot determine the exact weight of the load. However, based on the given options, the closest estimate is approximately 10,000 lb.

When all legs of the sling are equally spaced around the center of gravity, the sling sizes should be based on all the legs, not just four. This is because the load can teeter from corner to corner, causing all the slings to bear the weight. Therefore, the statement is false.

If the rigging on the hook is 1/2 inch off center, it means that the load is not evenly distributed. This can cause imbalance and reduce the load-carrying capacity of the hook. The correct answer of 80% suggests that the hook can still carry 80% of its maximum load despite the slight misalignment.

When using a 2 part bridle with a sling angle of 45 degrees, the load on each leg of the bridle is equal to the total load divided by the cosine of the sling angle. In this case, the load on each leg would be 31,000 pounds divided by the cosine of 45 degrees, which is approximately 43,939 pounds. To safely lift this load, a rigging size of 1 1/4 would be needed.

The correct answer is A capacity stamped on the spreader bar and A design drawing showing correct configuration. These two items are necessary before using a spreader bar. The capacity stamped on the spreader bar ensures that it is suitable for the load it will be lifting. The design drawing showing correct configuration is important to ensure that the spreader bar is used correctly and safely.