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Questions and Answers
What was the primary result of the structural failure of the rescue boat?
What was the primary result of the structural failure of the rescue boat?
- The boat was completely submerged.
- There were multiple injuries reported.
- The boat was successfully repaired immediately.
- The lifting frame and console assembly detached from the hull. (correct)
What factor contributed to the excessive force on the lifting frame of the rescue boat?
What factor contributed to the excessive force on the lifting frame of the rescue boat?
- The davit was not being used correctly.
- The hydraulic cylinder was over-compressed. (correct)
- The shock absorber was functioning properly.
- The rescue boat was too heavy.
Which statement reflects a key issue identified during the investigation?
Which statement reflects a key issue identified during the investigation?
- The crew received sufficient training on rescue boat operations.
- The operations manual clearly explained the potential for overload.
- Manual cranking could lead to an overload of the structure. (correct)
- The shock absorber was under-loaded during testing.
What action was taken immediately after the structural failure incident?
What action was taken immediately after the structural failure incident?
Why was there excessive force applied to the lifting frame during the incident?
Why was there excessive force applied to the lifting frame during the incident?
Flashcards
Structural failure of rescue boat
Structural failure of rescue boat
A catastrophic breakdown of the rescue boat's structure while unattended, resulting in it dropping into the sea.
Overload test
Overload test
A stress test to determine the maximum load that a structure can withstand without failure.
Hydraulic cylinder (shock absorber)
Hydraulic cylinder (shock absorber)
A device that absorbs shock and reduces the impact of forces on machinery or vehicles.
Manual cranking of davit
Manual cranking of davit
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Operations manual clarity
Operations manual clarity
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Study Notes
Structural Failure of Rescue Boat
- A rescue boat experienced a catastrophic structural failure while on a davit.
- No crew were working on the boat at the time.
- The lifting frame and console assembly were torn from the hull.
- The hull subsequently dropped into the sea.
- The boat's remains were recovered for investigation.
- No injuries were reported.
- A general alarm was sounded, and a muster was conducted.
- The area around the rescue boat station was isolated.
- A supply ship with a spare rescue boat was brought to the area.
Investigation Findings
- Forces applied to the fall wire were at or above the 1.1 x overload test threshold, as seen during factory acceptance testing.
- The hydraulic cylinder (shock absorber) was over-compressed.
- The accumulator was pre-charged with a pressure exceeding the factory acceptance test pressure.
Cause Analysis
- Constant excessive force on the lifting frame caused the failure.
- Excessive manual cranking overloaded the lifting frame.
- The operations manual lacked clarity regarding manual cranking overload limits.
- The crank lever system lacked load monitoring and control.
- Ongoing structural damage went unnoticed during routine maintenance.
- The method of rescue boat stowage (not in a cradle) increased structural damage risk.
- The shock absorber was not properly maintained.
Actions Taken
- A technical alert was issued for similar rescue boats.
- The hand crank assembly was replaced with a torque wrench.
- The davit stopper was modified for better control.
- Improved site acceptance procedures with improved communication between vessel engineers and OEM representatives.
Lessons Learned
- Authorised service personnel should service and maintain crucial lifting equipment components.
- Hydraulic component pressures (like accumulators) need to be set correctly and fully understood.
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