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Trawl Board Pull-Over Interaction to Subsea Pipeline in Sabah
Mohd Aslan Bin Moleng
Supervisor: Dr. Ahmad Faizal Ahmad Fuad
Bachelor of Science (Nautical Science and Maritime Transport)
School of Ocean Engineering
aslanmoleng777@gmail.com
Trawling is a method of catching fish in large volume where fish net are pulled through
water using one or two boats. There are two types of trawling method which are midwater
trawl and bottom trawl. Bottom trawling is where the nets are pulled over or closed
to seabed. Bottom trawl can affect the subsea pipeline if there is interaction. Therefore,
the objective of this study was to find out the impact of pull-over to subsea pipeline. The
geographical scope of this research was conducted in Sabah Offshore water with a total
of 8 pipeline connecting from oil field to onshore terminal. Two steps were involved in
order to determine the impact of pull-over trawling in Sabah’s subsea pipeline, namely
identify the trawl equipment used by local Sabahan trawlers and the finding the
specification of subsea pipeline in Sabah. Then, application of the acquired data to the
“Pull-Over” impact calculation. This approach was applied by taking one subsea pipeline
that has the highest frequency of fishing vessel. The validation of the impact is analyzed
using the graph acquired after applying it to the pull-over impact formula (force-time).
Then finally, after the impact of “pull-over” has been determined, the severity of the
impact is ranked and may help to improve the safety of navigation and operation at
subsea pipeline area.
Keywords- Trawling, Subsea pipeline and Pull-Over Impact.
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