27-11-2012, 06:37 PM
CRANE CONSIDERATIONS RELATED TO MAINTAINING WIND TURBINES
CRANE CONSIDERATI.pdf (Size: 83.53 KB / Downloads: 38)
MAJOR NEED FOR CRANES
Nacelle Lift or Removal – Big Crane
• Gearbox Replacement – Medium crane
- Note: High-speed bearings can often be
replaced uptower
• Blades – Medium crane (or rig from nacelle)
• Generator – Small crane for whole generator
- Note: If only bearings, can do job uptower
• Tower damage (rare) – Big crane
LARGE CRANE FEATURES
Liebherr Model 1400/2 - W
- Crawler, 4.5-m chassis
- Narrow track, special
for wind farms
• Capacity:400 T at 4.5 m
• Height to 119 m
• Cost: varies (ht., wt, distance)
- Mob/demob: 50k$ - 100k$
- 4-day rate: 130K$ - 200k$+
Crane Use for Heavy Maintenance
Large hydraulic crane
• Typical Lift
- Large Gearbox
• Mobilization
- Over road
- Cost, varies greatly
• Cost: $400 -$500 per hour
• Extra boom costs - add to
mobe/demobe + hrly