Prediksi Kedalaman Scour Pada Susunan Dua Pipa

Lasatira, Gleen Stenly (2016) Prediksi Kedalaman Scour Pada Susunan Dua Pipa. Masters thesis, Institut Technology Sepuluh Nopember.

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Abstract

Scour di sekitar pipa bawah laut merupakan aspek yang dapat mempengaruhi stabilitas pipa tersebut. Beberapa eksperimen penelitian sebelumnya telah dilakukan untuk menyelidiki kedalaman scour yang terjadi. Meskipun banyak penelitian telah dilakukan pada satu pipa, namun pengaruh perbandingan jarak antar pipa untuk scour pada dua pipa belum banyak dipahami. Dalam penelitian ini akan difokuskan pada pengaruh diameter pipa (D), perbandingan jarak antar pipa (G/D), dan bilangan Reynolds (Re) terhadap kedalaman scour. Simulasi dilakukan untuk dua pipa berdiameter 0.075 m dan 0.1 m, di mana perbandingan jarak yaitu G/ D 1, G/ D 1.5, dan G/ D  3. Hasilnya menunjukkan bahwa saat diameter pipa sama maupun saat D1  D2 , kedalaman scour relatif akan meningkat seiring bertambahnya jarak antar pipa, di mana D1 adalah diameter pipa utama dan D2 adalah diameter pipa kedua. Kondisi sebaliknya terjadi saat D1  D2 , kedalaman scour akan berkurang seiring bertambahnya jarak antar pipa. Perbandingan jarak G/ D 1 menghasilkan kedalaman scour yang lebih kecil dari perbandingan jarak G/ D 1.5 dan G/ D  3. Hal ini disebabkan oleh terganggunya vortex shedding di sekitar pipa utama. ======================================================================================================== The scour around submarine pipelines is one of the factors that affecting their stability which needs to be considered. There have been several experimental investigations on scour depth. Although many studies have been conducted to investigate scour below a single pipeline, the effects of the spacing between two pipelines on scour behaviour are not properly understood. This study is focussed to investigate the effects of pipeline diameters (D), gap ratio (G/D) between the pipelines, and Reynolds Number (Re) on the scour depth. Simulations are conducted for two pipelines with diameters 0.075 m and 0.1 m, where the gap ratio is G/ D 1, G/ D 1.5, and G/ D  3. In case the pipeline diameter are equal or D1  D2 , it is found that the relative scour depth increases with increasing the gap ratio, where D1 and D2 are upstream and downstream pipeline diameters, respectively. Meanwhile, when D1  D2 the scour depth decreases with decreasing the gap ratio. For the gap G/ D 1, the scour depth is smaller than at the gap G/ D 1.5 and G/ D  3 due to the disturbance of the vortex shedding around the upstream pipeline.

Item Type: Thesis (Masters)
Additional Information: RTKe 621.867 2 Las p
Uncontrolled Keywords: diameter pipa, kedalaman scour, perbandingan jarak, scour pada pipa, vortex shedding
Subjects: V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions: Faculty of Marine Technology > Marine Engineering > (S2) Master Theses
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 20 Dec 2019 07:09
Last Modified: 20 Dec 2019 07:09
URI: http://repository.its.ac.id/id/eprint/72453

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