DESIGN AND CRACK PROPAGATION MODELING WITH EXTENDED FINITE ELEMENT METHOD OF SUBSEA PIPELINE IN MADURA STRAIT
Indonesia is a country with a big potential in maritime sector. One of those are the potential for oil and gas. Oil and gas is one of the most frequently used energy sources in Indonesia. It is known that the demand for oil and gas is continues to rose over the year. However, the production of oi...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/68944 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Indonesia is a country with a big potential in maritime sector. One of those are
the potential for oil and gas. Oil and gas is one of the most frequently used energy
sources in Indonesia. It is known that the demand for oil and gas is continues to
rose over the year. However, the production of oil and gas in Indonesia its on the
decline over recent years. To increase the production of oil and gas, offshore
facilities such as subsea pipelines are needed to support the exploration and
exploitation process. Subsea pipelines are needed for transporting oil and natural
gas from offshore oil wells and gas wells to overland pipelines.
Ton of problems are often occurred when the subsea pipeline starts to operate.
One of those problems are the integrity of the pipeline being disrupted due to
defects found in the subsea pipeline during inspection process. The damage may
happen due to crack. To prevent severe damage due to crack, a method called
finite element method is carried out, with the intention to check the integrity of
cracking pipe. Recently, the extended finite element method, also known as
XFEM, is used to model cracks on pipes.
Before the pipe is being used, detailed subsea pipeline design must be carried out
in order to fulfill the applicable criteria, with pipe wall design criteria using the
DNVGL-ST-F101 standard, on-bottom stability analysis using the DNV-RP-F109
standard, installation analysis based on DNVGL-ST-F101, and free span analysis
using the DNV-RP-F105 standard. Crack modeling will also be carried out using
XFEM, to determined the effect of the crack size that spread from outside of the
pipe on a bursting pressure value, due to internal pressure that applied on the
model.
Based on the design process carried out in this Final Project, the wall thickness of
the pipe that will be used is 12.7 mm (0.5 in), the required concrete thickness is 63
mm (2.48 in), and the allowable free span of the pipe is 16.3 m. It is known that
the height of the crack size is affecting the burst pressure value the most, due to
internal pressure that applied on the model.
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