ASME ASME Cranes Hoists and Material Handling B30 2 — Questions and Answers
Question 1: According to ASME B30.9, what is the minimum design factor (safety factor) required for wire rope slings?
- 2:1
- 3:1
- 5:1 (Correct answer)
- 10:1
Correct answer: 5:1
ASME B30.9 requires wire rope slings to have a minimum design factor of 5:1, meaning the sling's breaking strength must be at least five times its rated capacity.
Question 2: Per ASME B30.10, at what percentage of throat opening increase must a hook be removed from service?
- 5%
- 10%
- 15% (Correct answer)
- 25%
Correct answer: 15%
ASME B30.10 specifies that a hook must be removed from service if the throat opening has increased by more than 15% from the original dimension, indicating dangerous deformation.
Question 3: According to ASME B30.20, what information must be permanently marked on below-the-hook lifting devices?
- Serial number and date of manufacture only
- Manufacturer name, rated load capacity, and weight of the device (Correct answer)
- Owner's name, purchase date, and last inspection date
- Material specification and heat treatment condition
Correct answer: Manufacturer name, rated load capacity, and weight of the device
ASME B30.20 requires that below-the-hook lifting devices bear permanent markings identifying the manufacturer, the rated load, and the weight of the device itself.
Question 4: Per ASME B30.2, what must be done before personnel are permitted to work beneath a suspended load?
- Obtain written approval from the crane manufacturer
- Ensure the load is secured and cannot be accidentally released or dropped (Correct answer)
- Limit crane travel speed to 10% of the maximum rated speed
- Post a warning sign at the crane's controls
Correct answer: Ensure the load is secured and cannot be accidentally released or dropped
ASME B30.2 prohibits personnel from working beneath a suspended load unless the load is safely secured, such as blocked or cribbed, to prevent unintended movement or dropping.
Question 5: According to ASME B30.5 for mobile cranes, which condition triggers mandatory inspection of the load line?
- After each calendar month of use
- After any occurrence that could have caused damage, such as a shock load (Correct answer)
- Every time the crane travels to a new work site
- Whenever a new operator assumes control
Correct answer: After any occurrence that could have caused damage, such as a shock load
ASME B30.5 requires inspection of the load line following any event that may have caused damage, including shock loads, contact with obstructions, or a dropped load.
Question 6: Per ASME B30.9, which sling configuration results in the greatest reduction in rated capacity compared to a straight vertical lift?
- Two-leg bridle sling at 90 degrees included angle
- Two-leg bridle sling at 60 degrees included angle
- Single-leg sling used in basket hitch
- Two-leg bridle sling at 120 degrees included angle (Correct answer)
Correct answer: Two-leg bridle sling at 120 degrees included angle
As the included angle between sling legs increases, the tension in each leg increases dramatically; a 120-degree included angle creates the greatest leg tension and thus the most severe capacity reduction.
Question 7: According to ASME B30.2, what is the required action when a crane's load-limiting or load-indicating device is found to be malfunctioning?
- The crane may continue in service at 75% of rated load until repairs are made
- The crane must be taken out of service until the device is repaired or replaced (Correct answer)
- The device may be bypassed if an experienced operator is present
- A written variance from the authority having jurisdiction must be obtained
Correct answer: The crane must be taken out of service until the device is repaired or replaced
ASME B30.2 requires that any crane with a malfunctioning load-limiting or load-indicating device be removed from service immediately until the device is properly repaired or replaced.
ASME ASME Cranes Hoists and Material Handling B30 2
According to ASME B30.9, what is the minimum design factor (safety factor) required for wire rope slings?