RISK ANALYSIS OF SUBSEA PIPELINE DUE TO DROPPED ANCHOR
The pipeline system is used as transportation to deliver petroleum and natural gas. One of the incidents on the subsea pipeline that caused pipe failure was due to interference from external parties. Anchor drop on pipes during maritime activity are cause of pipe failure from external parties. The c...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/43355 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The pipeline system is used as transportation to deliver petroleum and natural gas. One of the incidents on the subsea pipeline that caused pipe failure was due to interference from external parties. Anchor drop on pipes during maritime activity are cause of pipe failure from external parties. The consequences of pipe failure will have a serious impact on human safety, the environment and economic losses. Therefore, the integrity system in the pipeline must be maintained in order to continue to operate safely in various conditions during the operational time of the pipeline. For this reason, it is necessary to perform a risk analysis to identify hazards and evaluate the consequences which is caused by failures in the subsea pipeline system. In this study, wall thickness and on bottom stability calculations were performed as confirmation of pipe design and the risk was assessed from the probability of the ship dropping the anchor and hit the pipe also the impact of the consequences of the damage. For the consequence, can be analyzed with calculation of the energy that can be withstood by the pipe and energy impact due to the drop of the anchor. Pipeline finite element modeling using ANSYS software is performed in order to find out the analysis of dropped anchor impact the pipe so pipe damage were obtained based on dent per diameter. These results are classified based on damage criteria using DNV RP F107 code. Determination of risk categories and risk scoring in the final results using DNV RP F116 code. Dent ratio in modeling has very detailed results compared to DNV. Based on the results, variations in ship groups have different frequency and consequence values based on failure modes. Finaly, in risk assessment, mitigation is not needed because all risks are acceptable and safe.
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