Environmental and Site Hazards (Wind, Power Lines, Obstructions)
Environmental and Site Hazards (Wind, Power Lines, Obstructions)
Wind is a critical hazard: load charts often specify maximum wind speed for operation (e.g., 20 m/s) and out-of-service conditions (e.g., 50 m/s). Anemometers must be functional; if wind exceeds limits, stop and lower the load. Power lines require safe clearance (often 3 m for low voltage, more for high); use goalposts or spotters. Obstructions (buildings, other cranes) require anti-collision systems and slew limits.
Traps: ignoring gusts vs. average wind; assuming out-of-service wind limit is the same as operating limit; and forgetting that luffing cranes must be parked in the wind (jib raised). Also, power line contact can be fatal-maintain minimum approach distances per local standards.
Worked example / rule of thumb: If the anemometer reads 15 m/s and the chart limit is 20 m/s, you may continue but monitor. If it reads 22 m/s, stop. For power lines, use the “10-foot rule” (3 m) as a baseline but verify local regulations. Rule: When in doubt, stop and assess-wind and power lines are unforgiving.