Questions and Answers
What was the main cause of the accident involving the batteries?
What was the consequence of the accident?
What is a contributing factor to the accident?
What was the weight of the batteries that fell on the worker?
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What type of containers were the batteries stored in?
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Study Notes
Incident: Broken Wire Rope Strand
- A single outer wire rope strand broke, lifting a chandelier with a proximity switch into the bell main wire rope sheave, which could have prevented a safe bell lock on.
- The root cause of the incident was a design failure, as the chandelier was a tight fit, allowing movement when a broken strand passed through.
- A direct cause of the incident was equipment damage, as a single broken outer strand was enough to lift the chandelier into the bell main wire rope sheave.
Actions Taken
- The proximity sensors and chandelier were relocated to a solid suitable point on the static side of the clump weight wire rope, eliminating the risk of reoccurrence.
- A damaged length of the bell wire rope was cut back, and a load test was performed, witnessed by the Classification Society.
- A dive trial was conducted with an empty bell to working depth to double-check suitability and length of the bell main wire rope.
- Individual wire testing revealed reduced ductility, causing a lack of elongation in the complete wire rope and resulting in a reduced load-bearing capacity.
- The lack of ductility was explained by the phenomenon of strain aging, influenced by steel chemistry, manufacturing methods, time, and temperature relationships.
Incident: Lone Worker Collapsed at Onshore Site
- A person collapsed at a workshop facility due to a non-work-related, pre-existing medical condition and was unable to call for help.
- The person was working alone and was not discovered until the following day, despite having a phone.
- Following the collapse, the person was able to move into a disused office area but was not found until a colleague entered the workshop and heard a call for help.
Lessons Learned
- The importance of suitable arrangements to monitor and track lone workers, including security patrols/checks.
- Ensuring robust pre-employment medical screening and health surveillance measures to identify personnel who may be classed as vulnerable.
- Consideration of the use of fall alarms for lone workers, which can automatically alert on-call service in the event of an individual falling or collapsing.
Actions to be Taken for Lone Working
- Fully understand what "lone working" is and subject it to a task risk assessment that addresses foreseeable emergencies, access and egress arrangements, risk of violence, vulnerable persons, local legislative requirements, and the level of supervision required.
Incident: Watertight Doors
- Watertight doors that ought to have been secured shut were observed open during a safety walkaround, highlighting the importance of maintaining watertight doors.
Incident: Worker Injured by Falling Stack of Batteries
- A worker was severely injured after batteries weighing at least 300kg fell onto him, causing a double compound fracture, fractured bones, and other injuries.
- The incident occurred due to overstocking, unsafe stacking, and lack of documented risk assessments or safe systems of work for the correct stacking and storage of batteries.
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Description
This quiz analyzes an incident where a broken wire rope strand caused a chandelier to lift into the bell main wire rope sheave, potentially preventing a safe bell lock. Identify the root and direct causes of the incident.