A crane with a 150-foot boom is lifting a 5,000-pound load at a 75-foot radius. If the crane's load chart shows a capacity of 6,000 pounds at this configuration, what is the maximum allowable load including rigging weight?
Correct Answer
B) 5,400 pounds
The crane capacity must include the weight of rigging equipment, typically 8-10% of the load. With a 6,000-pound capacity and 5,000-pound load, approximately 400-500 pounds remains for rigging, making 5,400 pounds the safe maximum.
Why This Is the Correct Answer
Option B (5,400 pounds) correctly accounts for rigging weight in crane capacity calculations. The crane's rated capacity of 6,000 pounds must include both the load and all rigging equipment (slings, hooks, blocks, etc.). Industry standard allocates 8-10% of capacity for rigging weight, which equals 480-600 pounds in this case. With a 5,000-pound load plus approximately 400 pounds of rigging, 5,400 pounds represents the maximum safe total load.
Why the Other Options Are Wrong
Option A: 5,000 pounds
This exceeds the safe capacity when rigging weight is properly considered, leaving insufficient margin for the required rigging equipment weight.
Option C: 5,500 pounds
This only accounts for the material load weight and ignores the rigging equipment weight, which violates crane safety protocols and capacity calculations.
Memory Technique
Remember 'RIG-10': Always Reserve In Gross capacity about 10% for rigging weight when calculating maximum loads
Reference Hint
OSHA 1926 Subpart CC - Cranes and Derricks in Construction, specifically crane capacity and load chart requirements
More Project Mgmt Questions
What is the minimum R-value required for wall insulation in Florida Climate Zone 2?
A subcontractor brings a new chemical product to your jobsite. Under the Globally Harmonized System (GHS), what information must be immediately available to workers?
A construction site has a trench that is 8 feet deep in Type B soil. What is the maximum allowable slope ratio for the trench walls without protective systems?
What is the maximum recommended spacing between drywall screws when attaching to wood studs?
Your crew discovers suspected asbestos-containing materials during a renovation project. What is the first action you should take?
A scaffold platform is 12 feet long and 5 feet wide. If the maximum load capacity is 25 pounds per square foot, what is the total weight capacity of this platform?
Which CSI MasterFormat Division would contain specifications for fire-stopping and firesafing materials?
In tilt-up concrete construction, what is the primary advantage of this method over conventional cast-in-place construction?
Which OSHA standard specifically addresses construction industry safety and health regulations?
A structural drawing shows a beam labeled 'W12x26'. What does the '26' represent?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass