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The Marine Accident Investigation Branch (MAIB), has issued a safety bulletin to highlight urgent safety lessons that have arisen in the early stages of its investigation into the mooring line failure on board LNG tanker, Zarga.
Zarga was working alongside South Hook LNG terminal, Milford Haven, when the mooring line failure resulted in serious injury to a deck officer on 2nd March 2015. The mooring line parted during a berthing operation and resulted in the deck officer being struck and obtaining severe head trauma.
Following the accident, the MAIB commissioned a series of tests and trials designed to measure the elongation and snap-back characteristics of the mooring lines used on board Zarga. When sections of the UHMPE rope were loaded to the point of failure the average maximum elongation was about two percent and minimal snap-back was observed.
When the trial was repeated with the Euroflex tail2 attached the elongation was significantly increased. Similar to the accident, it was the UHMPE section of the line that parted, and the failed end that was attached to the tail snapped back over 15m in less than one second. The other end of the UHMPE rope did not snap back.
MAIB suggested to following safety lessons:
The causes and contributing factors of Zarga’s mooring line failure are subject to an ongoing investigation and will be discussed in a full investigation report by the MAIB.
For more information visit, MAIB.
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