Unit 4 - Lifting Crane Safety Thorold

1.

After filling out a lift plan for a pick with a rough terrain mobile hydraulic crane, you find that the weight of the upcoming pick is 87% of the cranes hoisting capacity. What type of lift plan will be required prior to the work?

Crane lift plan

General Lift Plan

Critical lift plan

No lift Plan

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.

Explanation

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.

2.

What is the working load limit in tons for a 1" Crosby Shackle?

4.1

8.6

9.8

8.5

6.7

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

Explanation

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

3.

The lifting lugs on the spreader beam are 17 feet apart. The pick is 10,000 pounds.

What sling length (L2) would you need to obtain 60 degrees? How high (H1) would that make the rigging above the spreader beam? How much tension (T) in each sling?

"Sling length = 17 feet, height = 14.72 feet, tension in each sling = 2,900 pounds"

"Sling length = 14.72 feet, height = 17 feet, tension in each sling = 5,800 pounds"

"Sling length = 17 feet, height = 14.72 feet, tension in each sling = 5,800 pounds"

"Sling length = 14.72 feet, height = 17 feet, tension in each sling = 5,800 pounds"

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.

Explanation

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.

4.

From the photo above, what is the Total Lifting Load for line #7, and what percent of the cranes capicity will the pick be for line #10?

"5,735 lbs and 12%"

"25,000 lbs and 53%"

"25,825 lbs and 51%"

"25,835 lbs and 52%"

"29,640 lbs and 55%"

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.

Explanation

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.

5.

How many tons can a 3/8" dia. plowsteel wire rope carry if the object is rigged using a choker hitch?

4

2.4

1.6

0.92

0.68

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.

Explanation

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.

6.

Which hitch type provides the most capacity for a 1" wire rope sling?

Straight pull

Choker hitch

Basket hitch

Two part bridal sling

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.

Explanation

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.

7. Who should be responsible for ensuring the proper lift planning is performed in accordance with the policy? (Check all that apply)

Job Superintendent

Field Superintendent

Field Engineer

Foreman

Operator

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.

Explanation

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.

Submit

8.

Which of the following conditions would require a wire rope sling to be taken out of service? Check all that apply.

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

A rope has been sitting in a dry Connex for 2 months

Missing or illegible tags

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.

Explanation

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.

Submit

9.

What are the two types of plans we use for our lifts and what criteria goes with each?
(Pick all that apply)

"General Lift Plan, 0 to 75%"

"General Lift Plan, 75 to 85%, Section 1 and 2 completed"

"Critical Lift Plan, 85% or greater"

"Critical Lift Plan, multiple crane pick"

"Critical Lift Plan, Picking within the radius of powerlines"

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.

Explanation

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.

Submit

10.

You are picking a 10,000 pound box with a sling angle of 35 degrees? What size sling would you need?

"5/8"" wire rope"

"1/2"" wire rope"

"3/4"" wire rope"

"1"" wire rope"

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

Explanation

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

11.

Which of the following conditions would require a synthetic sling to be taken out of service? Check all that apply.

Melted or charred

Broken or worn stitches

Tag missing or is illegible

Ultraviolet sunlight damage

Discoloration

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.

Explanation

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.

Submit

12.

You are picking a water tank up. The tank is 4 foot in Diameter and 10 feet long. The wall thickness of the tank is 1/2 inch. The tank sits on a skid that weighs 1,000 pounds. The tank has 200 gallons of water in it. Water has 7.48 gallons per cubic foot. What is the total weight of the pick?

"4,077 Pounds"

"3,077 Pounds"

"5,745 Pounds"

"5,986 Pounds"

"1,668 Pounds"

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

Explanation

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