Unit 4 - Lifting Crane Safety Thorold

A critical lift plan will be required prior to the work because the weight of the upcoming pick is 87% of the crane's hoisting capacity. This indicates that the lift is close to or exceeding the crane's maximum capacity, making it a critical lift that requires additional planning and precautions to ensure safety. A critical lift plan involves a more detailed analysis of the lift, including factors such as load weight, load stability, crane stability, rigging requirements, and potential hazards. This plan helps to mitigate risks and ensure that the lift is carried out safely.

The working load limit for a 1" Crosby Shackle is 8.5 tons.

L1 = 17 feet x 1.0 = 17 feet long. 17 feet x 0.866 = 14.72 feet high, 10,000 pounds x 0,58 = 5,800 pounds tension.

The Total Lifting Load for line #7 is 25,835 lbs and the pick for line #10 will be 52% of the crane's capacity.

The given answer of 0.92 is the correct answer because it is the maximum weight in tons that a 3/8" dia. plowsteel wire rope can carry when rigged using a choker hitch. The choker hitch is a type of rigging that involves wrapping the wire rope around the object and then passing the end of the rope through the wire rope itself, creating a loop. This method provides a secure grip on the object and allows for a higher weight capacity compared to other types of hitches.

A basket hitch provides the most capacity for a 1" wire rope sling. In a basket hitch, the sling is passed under the load and the ends are brought up and crossed over the load, forming a basket shape. This distributes the load evenly across the sling, maximizing its capacity. The other hitch types mentioned, such as straight pull, choker hitch, and two-part bridal sling, do not provide the same level of load distribution and capacity as a basket hitch.

The "On the Spot Lift Plan" says the Job Supt. is responsible but we should all ensure the planning is performed in accordance with our policy. The Operator should carry the plan and be able to tie every lift to a lift plan.

A wire rope sling would need to be taken out of service if there is evidence of heat damage, severe corrosion or pitting of the wires, 10 randomly distributed broken wires in one rope lay or 5 broken wires in one strand in one rope lay, or if there are missing or illegible tags.

The two types of plans we use for our lifts are the General Lift Plan and the Critical Lift Plan. The General Lift Plan is used for lifts that range from 0 to 75% of the crane's capacity. The General Lift Plan also includes completing Section 1 and 2. The Critical Lift Plan is used for lifts that are 85% or greater of the crane's capacity. The Critical Lift Plan is also used for lifts that involve multiple cranes and for lifts that involve picking within the radius of powerlines.

10,000 pounds/2= 5,000 pounds, 5,000 pounds x 1.742 = 8,750 pounds or 4.4 tons. 3/4 inch wire rope good for 4.9 tons, 5/8 wire rope good for 3.4

A synthetic sling would need to be taken out of service if it is melted or charred, has broken or worn stitches, has a missing or illegible tag, or has ultraviolet sunlight damage. Discoloration alone may not necessarily require the sling to be taken out of service, as it may not affect the sling's structural integrity.

Tank weighs 3,077 pounds + Skid 1,000 pounds + water 1,668 pounds