Where must the wind velocity-indicating device be mounted according to ASME B30.3?

The wind velocity-indicating device must be mounted at or near the top of the crane to ensure accurate readings. This positioning allows the device to measure the actual wind conditions affecting the crane's operation, rather than readings that may be influenced by the surrounding environment, such as nearby buildings or other obstructions. When placed at the top, the device is less likely to be affected by turbulent air caused by structures and can give a true indication of the wind speed that may impact lifting operations.

In contrast, positioning the device on the control panel, at ground level, or near the crane operator's seat may yield unreliable data about wind conditions. Such placements can lead to discrepancies in wind readings, which is critical for maintaining safe operations and preventing accidents during lifting activities. Understanding wind velocity is essential for assessing whether it is safe to operate the crane, especially in high-profile lifts.