Stabilisation At Rest (SAR) Ice Class

Common issues

• Mounting/bracket wear in the stabilization unit from ice-load vibration and shock
• Degradation of the damping element (elastomeric or hydraulic, per design) over time
• Sensor or monitoring drift affecting control response, where the unit is instrumented
• Corrosion at shaft line interfaces exposed to the machinery space environment
• Alignment drift between the shaft line and the damping unit following ice impact loads

Inspection checklist

• Check mounting bolts/brackets for tightness and corrosion
• Inspect the damping element for visible degradation
• Verify control/monitoring system function, where the unit is instrumented
• Check shaft line alignment periodically, particularly after any reported ice impact event
• Check for oil leakage if the unit is hydraulically damped

Service intervals

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Critical spares

• Mounting/isolation elements per the maker's specification
• Seal kit, if hydraulically damped
• Instrumentation cable/connector kit, where the unit is monitored

Safety

• Shaft line rotating machinery guards must be in place before inspection
• After heavy ice contact, inspect for damage before returning the unit to service
• Relieve any stored hydraulic pressure before opening the unit, where hydraulically damped
• Confirm the unit does not obstruct emergency access along the shaft tunnel

Class survey

Shaft line vibration/stabilization equipment on ice-class vessels is generally checked as part of the propulsion/shaft line survey scope, particularly after reported ice impact events. Detailed service data specific to this Kongsberg unit was not independently available here and should be confirmed against the maker's own technical manual.