load chart & rigging practice exercises – questions

CraneSafe + Fulford Certification Tel: 604.398.5230 | www.fulford.ca

MOBILE HYDRAULIC CRANE

20 Tonnes & Under

Lorain LCD-150

LOAD CHART & RIGGING

PRACTICE EXERCISES – QUESTIONS

CraneSafe Certification

Mobile Hydraulic 20 Tonnes & Under PRACTICE EXERCISES LCR.M20.LRLCD150.PEX1(020310)

8 May 2014

Load Chart& Rigging PRACTICE EXERCISES Mobile Hydraulic – 20 Tonnes & Under Lorain LCD-150 (1)

www.fulford.ca CraneSafe + Fulford Certification PEX2

Introduction

These 10 questions are for you to use to help get ready for the load chart part of the CraneSafe Certification assessment for Mobile Hydraulic – 20 Tonnes & Under.

The questions on your assessment will be different from these but will be presented in the same format as these questions.

With the questions are the answers with the relevant load charts. The answers explain how we arrived at the correct answer and you can use this to help work through any questions you may have gotten incorrect. We have not included all of the charts for this crane - but everything you need to answer the questions is included. You do not need the crane manual or full load chart package to answer the questions.

• 1/2 inch 6 x 19 IWRC, IPS, load line on main winch (main boom lifts)

• 1/2 inch Rotation Resistant line on auxiliary winch (jib lifts)

Specifications

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Load Chart & Rigging PRACTICE EXERCISES Mobile Hydraulic – 20 Tonnes & Under Lorain LCD-150 (1)


2. What is the crane’s maximum radius based on the following configuration?

• Main boom extended to 52 feet

• Load weight – 5,900 lbs

• 3 sheave block on main boom

• Rigging – 100 lbs

• Lift in the over the front quadrant

• Outriggers fully extended and set

Answer: feet

Load Chart & Rigging Questions

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1. What is the crane’s net capacity based on the following configuration?



• Radius – 15 feet


• Over the front quadrant


Answer: pounds



4. What is the maximum load that can be lifted based on the following configuration?



• 15 foot jib erected with hook and ball


• Radius – 27 feet

• Lift from main boom over the side quadrant


Answer: pounds

3. What is the crane’s lowest boom angle based on the following configuration?


• Load weight – 4,200 lbs

• Hook ball on main boom


• Lift in the over the side quadrant


Answer: degrees

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6. What is the longest boom length and radius the load can be picked and carried at creep speed?

• Load weight 3,900 lbs


• Rigging 80 lbs

Answer: Main Boom Length feet

Radius feet

5. What is the crane’s net capacity based on the following configuration?


• JIb erected with 15 degree offset

• Hook and ball on jib


• Main boom angle – 52 degrees


Answer: pounds

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7. Name 7 precautions that must be addressed in a pick and carry operation.

Answer: 1.

2.

3.

4.

5.

6.

7.

8. What is the minimum size of 2-leg chain bridle required to lift a load of 10,000 pounds?

The bridle is choked at a 60 degree angle.

Answer: inches



9. What is the minimum size of nylon web 2-leg bridle required to lift a load of 5,000 pounds?

The slings are in a choker hitch configuration at a 45 degree angle.

Answer: inches

10. What is the minimum size of nylon web slings required to lift a load of 11,000 pounds?

The two web slings are in a basket hitch configuration at a 35 degree angle.

Answer: inches



20 Tonnes & Under

Lorain LCD-150


PRACTICE EXERCISES – LOAD CHARTS



8 May 2014



These charts are for assessment purposes only and should not be used to operate a crane. The individual crane’s load chart, operating instructions and other instructional plates must be read and understood prior to operating the crane.

Load Charts




Rigging Tables

Working Load Limit in pounds

When using a 2-leg bridle in a choker hitch configuration, multiply the above values by .75.

When using a double basket hitch configuration, multiply the above values by 2.

Note: For training and assessment use only.




Note: Capacities are for flat eye, twisted eye and triangle fittings. For training and assessment use only.










Note: For training and assessment use only.



20 Tonnes & Under

Lorain LCD-150


PRACTICE EXERCISES – ANSWER KEY



8 May 2014



Load Chart & Rigging Answers

Q1 Net Capacity

To find the gross capacity you must check the capacity at 22 feet main boom length at a 15 foot radius in the over the front quadrant: 14,500 lbs.

You must also check the capacity at 36 feet boom length at a 15 foot radius in the over the front quadrant: 14,900 lbs.

NOTE: #2 Operation applies when either radius or boom length, or both, are between listed values, the smaller of the two listed load ratings shall be used.

Net Capacity = Gross Capacity – Weight of Load Handling Devices

Deductions (Weight of Load Handling Devices)

2 sheave block 325 lbs

Rigging 60 lbs

385 lbs

Gross Capacity: 14,500 lbs

Net Capacity: 14,500 – 385 = 14,115 lbs

Q2 Maximum Radius

Maximum Radius = Load Weight + Load Handling Devices

Gross Load

Load weight 5,900 lbs


Rigging 100 lbs

6,350 lbs

Go to the over the front quadrant at a boom length of 52 feet then follow the column down until you come to a capacity that’s equal to or greater than the gross load of 6,350 lbs.

Maximum Radius: 25 feet



Q3 Lowest Boom Angle

Gross Load on Crane = Load Weight + Load Handling Devices

Gross Load


Hook ball 121 lbs

Rigging 80 lbs

4,401 lbs

NOTE: #2 Operation applies.

At the 36 foot boom length at 0 degrees. The capacity is 4,500 lbs which is more than the gross load on the crane in the over the side quadrant.

At the 52 foot boom length at 49.4 degrees. The capacity is 5,600 lbs which is more than the gross load on the crane in the over the side quadrant.

The higher of the two boom angles applies to determine the lowest boom angle the gross load can be boomed down.

Lowest Boom Angle: 49.4 degrees

Q4 Maximum Load

Because the 27 foot radius is between values listed, you must go to the next longer radius of 30 feet to determine gross capacity.

Maximum Load to be Lifted = Gross Capacity – Load Handling Devices

Deductions (Load Handling Devices)


Hook ball x 2 (see note) 242 lbs

Rigging 80 lbs

647 lbs

Gross Capacity at a 27 foot radius: 5,100 lbs

Maximum Load = 5,100 – 647 = 4,453 pounds

NOTE: #6 Operation applies.

When jibs are erected but unused, add two (2) times the weight of any hook block, slings and auxiliary lifting devices at the jib head to the load.



Q5 Maximum Load

Because the boom angle is between values listed, you must go to the next lower boom angle of 51 degrees to determine gross capacity.

Net Capacity = Gross Capacity – Load Handling Devices

Deductions (Load Handling Devices)

Hook ball 121 lbs

Rigging 40 lbs

161 lbs

Gross Capacity at 51 degrees, 15 degree offset: 3,100 lbs

Net Capacity = 3,100 – 161 = 2,939 lbs

Q6 Boom Length & Radius at Creep Speed

Gross Load



Rigging 80 lbs

4,305 lbs

Main Boom Length: 52 feet

Radius: 20 feet

Q7 Pick & Carry

See notes 4 and 5 on set up for pick and carry.



Q8 Chain Slings

Answer: 1/2 inch

The capacity of a 1/2 inch chain sling in a 2-leg bridle hitch at a 60 degree angle is 16,627 pounds.

The slings are choked so there is a 25% reduction in capacity: 16,627 x .75 = 12,470 pounds

Q9 Web Slings

Answer: 5 inch

The capacity of a 5 inch nylon web sling in a 2-leg bridle hitch at a 45 degree angle is 7,775 pounds.

The slings are choked so there is a 25% reduction in capacity: 7,775 x .75 = 5,831 pounds

Q10 Web Slings

Answer: 4 inch

The capacity of one 4 inch nylon web sling in a single basket hitch at a 45 degree angle is 6,220 pounds.

The slings are in a Double Basket Hitch: 6,220 x 2 = 12,440 pounds

load chart & rigging practice exercises – questions

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