Liebherr BOS 4200-40 LITRONIC Offshore Crane Technical Specification

1. General Information

  • Manufacturer: Liebherr-Werk Nenzing GmbH, Austria
  • Model: BOS 4200-40 LITRONIC
  • Type: General Purpose Offshore Crane (Board Offshore Slewing Crane)
  • Design Standard: EN 13852-1 "General Purpose Offshore Cranes" (May 2004)
  • Scope of Supply: Includes boom sections, hooks (SWL 20t and 45t), hook cradles, tools, assembly materials, painting, winches, ropes, and structural components. Key weights:
    • Boom (excl. ropes): Approx. 41.1 tonnes
    • Boom: Approx. 46.36 tonnes
    • Hook (main, 20t SWL): Approx. 2 tonnes
    • Various sub-assemblies: 0.5–14.3 tonnes (e.g., pedestal approx. 13.3 tonnes, machinery house approx. 14.3 tonnes)

2. Dimensions and Geometry

  • Boom Length: 48 m
  • Working Radius:
    • Minimum: 9.4 m
    • Maximum: 50 m

3. Capacities and Load Chart

  • Safe Working Load (SWL):
    • Main Hoist (2-fall operation): Up to 40 tonnes (onboard/offboard)
    • Single-Fall Operation: Up to 20 tonnes
    • Personnel Lift: Up to 3 tonnes

Load Chart Summary (Main Hoist, 2-Fall; SWL in tonnes):

Boom Angle [°] Radius [m] Onboard Lift Offboard (SWH 0.5m) Offboard (SWH 1.0m) Offboard (SWH 1.5m) Offboard (SWH 2.0m) Offboard (SWH 2.5m) Offboard (SWH 3.0m) Personnel Lift
82.7 9.4 40.0 40.0 40.0 40.0 40.0 40.0 40.0 3.0
77.1 14.0 40.0 40.0 40.0 40.0 40.0 40.0 40.0 3.0
69.6 20.0 40.0 40.0 40.0 40.0 40.0 40.0 40.0 3.0
58.9 28.0 40.0 40.0 40.0 40.0 40.0 40.0 40.0 3.0
49.9 34.0 40.0 40.0 40.0 40.0 40.0 38.7 36.3 3.0
39.5 40.0 40.0 40.0 40.0 40.0 36.8 32.9 29.7 3.0
25.7 46.0 40.0 40.0 39.1 35.5 31.6 28.4 25.7 3.0
7.8 50.0 38.0 37.5 37.1 33.2 29.9 27.1 24.5 3.0
  • Hook Speeds (Minimum Recommended):
    • SWH 0.5m: 0.09 m/s (5 m/min)
    • SWH 1.0m: 0.17 m/s (10 m/min)
    • SWH 1.5m: 0.24 m/s (14 m/min)
    • SWH 2.0m: 0.30 m/s (18 m/min)
    • SWH 2.5m: 0.36 m/s (22 m/min)
    • SWH 3.0m: 0.41 m/s (25 m/min)
  • Operational Limitations:
    • Hoisting Speed (2-Fall): 50–100 m/min for SWL <5t (per EN 13852-1 Annex B.4.1)
    • No limitations per EN 13852-1 Annex C.1

4. Operational Conditions

  • Environmental:
    • Max Static Inclination: 1.0° (trim/heel)
    • Max Constant Wind Speed: 25 m/s (operational); 63 m/s (stowed)
    • Wind Pressure: 0.39 kN/m² (operational); 2.43 kN/m² (stowed)
    • Visibility for Personnel Lift: Daylight only

5. Foundation Reactions (RTF - Envelope Over All Load Cases)

  • At Slew Bearing Level:
    • Max Horizontal Force: 165 kN
    • Max Vertical Force: -2,300 kN
    • Max Overturning Moment: 42,000 kNm
    • Max Torsional Moment: 4,500 kNm
  • At Boom Rest (Stowed Condition):
    • Max Vertical Force (Fz): 425.4 kN
    • Max Horizontal Force (Fy): 243.1 kN
  • Load Cases Breakdown (Stowed; max values from LC1–LC4):
    • Vertical Loads: Static boom up to 454.76 kN; Dynamic up to 231.79 kN; Ropes/Hooks minor
    • Horizontal Loads: Static boom up to 155.54 kN; Wind up to 134.41 kN; Dynamic up to 115.89 kN
  • Remarks: Forces/moments calculated via allowable stress method. Wind applied as single force on boom COG.

6. Hydraulic and Electrical Systems

  • Electrical:
    • Main Power (Hydraulic Drive Motors): 2 × 240 kW
    • Voltage Tolerances: AC steady-state ±10% voltage, ±5% frequency; AC transient ±20% voltage, ±10% frequency; DC ±10% voltage
    • Short Circuit Fault Level: Max. 10 kA rms (main supply, auxiliary supply, emergency aggregate)
    • Control Voltages: 24 VDC, 110 VAC
  • Hydraulic:
    • Electro-hydraulic system driven by 2 × 240 kW electric motors
    • Components include hydraulic controls, pressure accumulator/MOPS, dedicated pumps for hoisting, luffing, and slewing gears