Design and Stress Analysis of Crossing Pipeline with Concrete Mattress Supporting Structure in Java Sea
Yustin Riana Harmiyanti dan Ricky Lukman Tawekal
Program Studi Teknik Kelautan
Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung
Jl. Ganesha 10 Bandung 40132
yustinriana22@students.itb.ac.id dan ricky@ocean.itb.ac.id
ABSTRACT
The principle of economics is applied in the selection of pipeline routes. So, choosing the shortest route by crossing considered to be one of best option. Pipe crossing, which is a condition where new pipes are installed across the old pipes. For this reason, a support structure is needed to support the new pipe so that its presence does not interfere with the operation of the old pipe. The supporting structure will affect the stress of the crossing pipe so that the stress analysis is needed so that the stress does not exceed the pipe capacity according to ASME B13.4 Chapter IX. The main principles in the underwater pipeline design process must not be ruled out. The pipe system to be made must be strong and safe during the installation process, hydrates, and during the planned operational or service life. In the design phase the DNV OS–F101 wall thickness is used as a reference standard. In the design coating there are two standards on bottom stability considered namely the DNV–RP–E305 standard and DNV–RP–F109. The feasibility analysis of the pipe installation is carried out with software based on finite element method to ensure that the pipes that are designed meet the industrial criteria and DNV OS F101 requirements to use ships with certain configurations. The free span analysis stage is based on the DNV standard RP–F105. After going through the entire subsea pipeline design process and crossing the pipeline design, the pipe to be installed has a thickness of 0.406 in, requires an asphalt coating layer of 0.699 in, can be safely installed using the S–Lay method of the ship available, and has a large span the maximum allowable length of 22.11 m, and using 2 pairs of supporting structures in the form of concrete mattresses with a height of 1.2 m and 0.2 m respectively, are safe from possible overturning, sliding, and bearing capacity failures.
Keywords: Pipeline, Crossing, Stability Analysis, Support Structure, Concrete Mattress
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