WTT Rigging & Lifting Operations 3

Question 1

At approximately what sustained wind speed should crane-assisted lifting operations on a wind turbine site typically be suspended per general industry guidelines?

Accepted Answer

20 mph (32 km/h)

Answer

Most crane manufacturers and site safety plans recommend suspending outdoor lifts at sustained wind speeds of 20 mph (32 km/h) or greater, though crane-specific charts govern exact limits.

Question 2

Which of the following defects requires a chain sling to be immediately removed from service?

Accepted Answer

Any chain link stretched more than 3% of its original length

Answer

ASME B30.9 requires removal from service if any chain link has been elongated more than 3% of original length, indicating yielding of the material.

Question 3

Why is knowledge of a load's center of gravity (COG) critical before performing a rigging lift?

Accepted Answer

It ensures the load will hang level and the rigging points are correctly positioned to prevent tipping

Answer

Knowing the COG allows riggers to position attachment points so the load remains balanced and level when lifted, preventing dangerous tilting or spinning.

Question 4

When a tandem (two-crane) lift is required to install a wind turbine tower section, who is responsible for coordinating the movements of both cranes?

Accepted Answer

A single designated lift director who issues all movement commands

Answer

ASME B30.2 and industry practice require a single lift director to coordinate all movements during a tandem lift to prevent load imbalance or crane overload.

Question 5

Before using a fixed lifting lug welded to a wind turbine nacelle frame, what inspection step is most critical?

Accepted Answer

Verifying the weld integrity, lug plate condition, and that the lug is rated for the intended load

Answer

Fixed lifting lugs must be inspected for weld cracks, plate deformation, and a verified load rating, as a failed lug can cause catastrophic load drop.

(WTT) Wind Turbine Technician Certification Practice Test

(WTT) Wind Turbine Technician Certification Practice Test

WTT Rigging & Lifting Operations 3