Type TT (Standard Tunnel Thruster)
Kongsberg Maritime Type TT (Standard Tunnel Thruster) — Auxiliary propulsion, Dynamic Positioning (DP), bow and stern installations.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Propeller blade tip clearance to tunnel plating and inspection for erosion/paint loss
Propeller shaft seals and elastomer O-ring condition (renewal interval: 5-year)
Bearing clearances and roller bearing wear assessment; gear tooth pattern inspection
Gearbox/hydraulic oil analysis and fluid condition; EAL (Environmentally Acceptable Lubricant) compatibility verification
Electric motor stator/rotor condition, vibration levels, temperature monitoring, and spin testing verification
Drive module accessibility and intermediate shaft/coupler inspection for wear or misalignment
Pitch change control mechanism operational testing (for CP variants) and control system validation
Tunnel structure integrity assessment for cavitation erosion, corrosion, and fatigue cracking
Type-general inspection and maintenance points for this equipment category — not model-specific.
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