Safety Flash
Crane motion reference unit (MRU) malfunctions after overheating
Crane motion reference unit (MRU) malfunctions after overheating
- IMCA
- Safety Flash
- IMCA SF 03/11
- Crane and RiggingLifting OperationsMachinery and Equipment
- Functional safety
- Inspection and maintenanceLifting operations
- Crane
- Alarm managementPre-use checksRisk assessment
- Upstream oil and gas
- Vessel
Summary
During FPSO mooring-chain inspection, a crane unexpectedly left active heave compensation mode and paid out approximately three to four metres of wire. An overheated motion reference unit supplied spurious signals, triggering shutdown. The flash describes cooling improvements, an air-conditioning trip alarm and start-up inspection, alongside further measures considered.
Classifications: Functional safety; safety instrumented systems; SIS.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Lifting operations; load lifting; hoisting.
Classifications: Crane; cranes.
Classifications: Alarm management.
Classifications: Pre-use checks; pre-use inspection.
Classifications: Risk assessment; hazard assessment.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Vessel; aboard ship; onboard vessel.
Summary
A member reports the following incident in which a crane paid out winch wire unexpectedly whilst in active heave compensation (AHC) mode.
IMCA SF 03/11. Themes: crane and rigging, lifting operations, machinery and equipment.