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Questions and Answers
What pressure was estimated to have caused the unplanned release of hydrocarbon gas?
What pressure was estimated to have caused the unplanned release of hydrocarbon gas?
What action was taken by the divers immediately after observing gas bubbles during the dummy stab removal?
What action was taken by the divers immediately after observing gas bubbles during the dummy stab removal?
Which safety rule was potentially violated during the incident described?
Which safety rule was potentially violated during the incident described?
What was identified by the divers that led to a pause in their work activities?
What was identified by the divers that led to a pause in their work activities?
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What was the outcome for the diver after the sudden release of gas?
What was the outcome for the diver after the sudden release of gas?
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Study Notes
Diver Exposed to Unplanned Release of Production Gas
- During saturation diving at 65 meters, a diver was exposed to a rapid, unexpected release of high-pressure hydrocarbon gas.
- The estimated pressure was over 150 bar.
- The force of the gas release pushed the diver backwards, but he was unharmed.
- The incident was a major potential near-miss.
Incorrect Tagging of Subsea Skid
- Divers were working on a subsea skid when they noticed incorrect tagging.
- The work was stopped, and a dummy stab removal was instructed.
- Working with handheld tools such as a T-Bar and hammer, a gas bubble release occurred during the dummy stab removal.
- Diver 1 returned to the bell, and Diver 2 was instructed to re-tap the blind stab.
- During the re-tapping, the dummy stab expelled, releasing the production gas.
- Diver 2 was pushed back, but remained on top of the skid.
Issues with the Isolation of the Skid
- Unlike previous work, the isolation of this skid couldn't be properly verified.
- No way to vent the void behind the blind stab was available.
- The pipework configuration hampered the verification of the isolation.
Additional Diver Safety Recommendations
- The incident highlights the importance of verifying isolation procedures before commencing work.
- It is crucial to reinforce stop-work authority across all work sites and operations.
- Personnel should be empowered to question and assess potential risks and implement mitigating controls.
- Review procedures and task plans to incorporate "hold points" detailing the use of ROV tools.
- Check surrounding environments before starting operations to identify and mitigate potential risks.
- Proper fall protection, barricades, and caution tape should be implemented where necessary.
Dropped Object - Wooden Packing Block
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During pipelaying operations, a wooden packing block (approximately 1 kg) became attached to the pipe.
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The block crossed the main deck and entered the lay tower.
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It fell more than 10 meters through the lay system and landed on the workstation floor.
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No injuries occurred.
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The block's passage through the drop barriers of the workstation was unexpected. The incident highlights the need to enhance barrier systems to prevent similar incidents.
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Ensure all barriers are sufficient for the operations being performed.
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Establish appropriate safety protocols to mitigate the risk of dropped objects.
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Risk awareness is important, and a strong attention to safety protocols will help prevent the dangerous normalisation of unsafe procedures.
BSEE: Person Fell Through Open Hatch
- A worker on a blowout preventer platform fell through a damaged hatch cover.
- The worker sustained injuries to the leg and knee.
- Multiple factors contributed to the incident: lack of situational awareness, inadequate fall protection measures, and failure to take corrective action after the hatch cover removal.
- Offshore environments demand constant situational awareness and prompt hazard identification, and response.
- Operators and contractors should check surroundings for hazards, document them, communicate them, and implement effective fall protection measures.
NTSB: Fire on Vessel - Escaped Exhaust Gases
- A fire broke out in a stateroom on a small towing vessel.
- The fire was extinguished, and there were no injuries and no pollution. However, the vessel was extensively damaged.
- The fire started behind panels in the pilot's stateroom, between the vessel's two stacks featuring engine exhaust mufflers.
- Cracks in the welds on the upper section of the starboard muffler allowed hot exhaust gases to escape, igniting wooden structures.
- Wood framing and fittings were a significant factor in the extensive damage that occurred. A contributing factor to the fire spreading was heavy use of combustible materials in the fitting-out, furnishings and joinery.
- The NTSB report emphasizes the importance of regular inspection of machinery exhaust systems and their surroundings.
Snagging Hazards
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Two separate incidents involve cargo snagging objects.
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In case 1: A cargo container’s corner snagged on a deck light guard, putting stress on the sling attached to the container, which subsequently parted. The container stowed on the deck safely. No one was injured, and no damages to the environment
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In case 2: The crotch strap of a worker's life jacket became snagged on the anchor clutch lever during mooring operations. This put stress on the anchor chain, eventually causing it to part. There were no injuries.
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The crane operator's lack of awareness and failure of deck crew to intervene were contributing factors.
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Ensure clear visibility and proper communication of potentially hazardous conditions.
Vessel Anchor Winch
- During a maritime operation, a hanging loop in a worker's lifejacket became snagged on the anchor winch.
- A pre-use check inspection was not completed, and a securing pin wasn't in place, which contributed to the issue.
- Inspection of anchor winches and pre-use checks before commencement of each operation are essential.
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