Podcast
Questions and Answers
In the described incident, what primary factor led the crane operator to incorrectly assume the hook had reached the seabed?
In the described incident, what primary factor led the crane operator to incorrectly assume the hook had reached the seabed?
- The crane operator's prior experience with similar operations.
- A malfunctioning depth gauge on the crane.
- The crane wire providing slack, indicating no tension. (correct)
- The diving supervisor's direct visual confirmation.
Which of the following actions would be MOST effective in preventing a recurrence of the incident?
Which of the following actions would be MOST effective in preventing a recurrence of the incident?
- Increasing the speed of crane operations to minimise exposure time.
- Implementing a policy of not using cranes in subsea tie-in operations.
- Restricting diving operations to daylight hours only.
- Enhancing visibility aids and ensuring clear communications between all parties. (correct)
What immediate action demonstrated effective emergency response following the helmet strike?
What immediate action demonstrated effective emergency response following the helmet strike?
- The diver reporting their condition and promptly returning to the dive bell. (correct)
- The diving supervisor immediately reprimanding the crane operator.
- Immediate suspension of all diving operations at the site.
- A detailed investigation into the crane's maintenance history.
How did the incident highlight the importance of protective equipment in subsea operations?
How did the incident highlight the importance of protective equipment in subsea operations?
Besides poor visibility, what was another key factor that Directly contributed to the crane hook striking the diver's helmet?
Besides poor visibility, what was another key factor that Directly contributed to the crane hook striking the diver's helmet?
Flashcards
Crane Hook Incident
Crane Hook Incident
During subsea spool tie-in, a crane hook struck a diver's helmet due to the supervisor assuming the hook was on the seabed. The diver was unharmed due to the helmet's integrity.
Adequate distance
Adequate distance
The crane pennant/stinger should be long enough to keep safe distance between divers and crane hook. This reduces accidental contact, especially with low visibility.
Enhanced Visibility
Enhanced Visibility
Using underwater cameras, sonar, or beacons can help track equipment in poor visibility. This prevents misjudging equipment locations.
Reinforce Communication
Reinforce Communication
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Updated Procedures
Updated Procedures
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Study Notes
Overview
- During subsea spool tie-in operations, a crane hook struck a diver's helmet.
- The diver sustained no injuries due to the helmet's integrity and durability.
Incident Details
- Divers worked on the seabed in poor visibility during subsea spool tie-in.
- After landing the pipe handling frame (PHF), the Diving Supervisor told the crane operator to lower the crane hook to allow the diver to disconnect rigging.
- The crane operator reported 'no weight' on the crane wire causing the Diving Supervisor to assume the hook had reached the seabed.
- The Diving Supervisor instructed the diver to disconnect the PHF.
- The crane hook struck the diver's helmet while the diver was positioned under the PHF.
- The diver was reported unharmed and returned to the dive bell, and the dive was aborted.
- The diver's reclaim helmet was damaged beyond repair, including the side block.
What Went Right
- Diver 2 helped Diver 1, preventing injuries.
- Both divers returned to the bell safely.
- Locating beacons on divers and the crane block aided tracking.
- Procedures, lifting plans, and Job Hazard Analysis (JHA’s) followed throughout.
- The diver was uninjured due to the protective equipment of the helmet.
What Went Wrong
- The crane hook rested on the PHF's top beam, resulting in a 'no weight' reading.
- The crane operator wrongly assumed the hook reached the seabed.
- The hook slipped off the beam and struck the diver's helmet as the diver approached the disconnection point.
Causes
- Inadequate crane pennant/stinger length did not give enough distance between divers and the crane hook.
- Poor visibility hindered observation of the crane hook.
Lessons and Actions
- Ensure adequate distance between divers and crane hook by using appropriate length crane pennant/stinger. This is especially important in limited visibility.
- Use visibility aids and monitoring such as locating beacons, underwater cameras, or sonar as ways to track the crane hook's position in poor visibility.
- Communicate clearly to prevent assumptions, and ensure procedures are reinforced between the dive supervisor, crane operator, and divers so all parties are aware of equipment locations.
Additional Member Actions
- Project procedures updated to include minimum pennant lengths for different operations.
- Pre-operation inspections conducted on all rigging and lifting equipment.
- Updated Job Hazard Analysis (JHA) to incorporate lessons regarding safe distances, visibility, and communication.
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