DESIGN AND RISK ASSESSMENT ANALYSIS OF SUBSEA PIPELINE IN NATUNA SEA
Oil and natural gas are still the main sources of energy that support our life. In Indonesia, oil and gas exploration and exploitation activities continue to grow rapidly and are generally carried out offshore. Subsea pipelines are an effective and efficient solution for massive and sustainable f...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/68978 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Oil and natural gas are still the main sources of energy that support our life. In
Indonesia, oil and gas exploration and exploitation activities continue to grow
rapidly and are generally carried out offshore. Subsea pipelines are an effective
and efficient solution for massive and sustainable fluid distribution. In general, the
fluids that flow through subsea pipelines are toxic or can pollute the environment
and are dangerous for humans. Therefore, it is necessary to design and analyze the
pipeline based on the applicable quality standards.
The design stages are carried out to determine the wall thickness of the subsea pipe
based on the DNVGL-ST-F101 standard, to determine the lateral stability and
vertical stability based on the DNV-RP-F109 standard, to determine the lay-barge
configuration in the installation process based on the applicable stress limits, and
to determine the span length permitted under the DNV-RP-F105 standard. After
that, an analysis of the risk of subsea pipeline failure due to external events that
may occur is carried out based on the DNV-RP-F107 standard.
Based on the design process carried out, the subsea pipeline wall thickness is 14.3
mm, the concrete layer thickness to achieve stability on the seabed is 45 mm, and
the allowed free span length is 13.60 m. The lay-barge configuration in the
installation process is carried out with the PLB Hafar Neptune ship with a hitch
angle of 0o and a trim barge angle of 0.6o. Installation modeling obtained the
maximum stress in the overbend area of 84.62% and in the sagbend area of 25.4%.
Subsea pipeline risk analysis is seen for dropped anchor and sinking vessel failure
scenarios based on the DNV-RP-F107 standard using ship arrival data for 1 year
from the Port of Singapore, Batu Ampar Port, and Tanjung Pelepas Port. The
results of the analysis show that the level of risk of subsea pipeline failure in Natuna
waters is in the acceptable, ALARP, and not acceptable area. |
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