Analisis Panjang Span Maksimum Yang Diizinkan Akibat Vortex Shedding Pada Riser Klb Platform.

Hamzah, Rizka Fajri (2022) Analisis Panjang Span Maksimum Yang Diizinkan Akibat Vortex Shedding Pada Riser Klb Platform. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sistem pipa bawah laut yang bekerja pada kedalaman tertentu di dasar laut pasti akan mengalami kegagalan jika dihadapkan dengan kondisi lingkungan yang tidak konstan seperti pengaruh gelombang dan arus. Pengaruh kondisi lingkungan tersebut akan menyebabkan terjadinya Vortex Induced Vibration (VIV), hal ini jika tidak dianalisis saat mendesain pipa, akan menimbulkan bentangan bebas (free span) yang berakibat pada kegagalan sistem pipa tersebut. Oleh karena itu, harus dilakukan perhitungan Maximum Allowable Free Span Length (MAFSL) pada riser KLB platform. Riser yang terletak pada platform KLB yang berlokasi di lepas pantai Jawa Barat sebelah utara sekitar 80-200km timur laut Jakarta. KLB platform merupakan salah satu dari lima platform yang direncanakan oleh Pertamina Hulu Energi Offshore Northwest Java (PHE ONWJ) untuk dilakukan penggantian dan pemasangan jaringan pipa yang baru. Perhitungan MAFSL pada riser KLB platform yang memiliki ukuran diameter luar 323,9mm dan Panjang 1km ini dilakukan dengan menggunakan software MathCAD, serta code dan standard berdasarkan DNV RP C205 dan DNV 1981. Kesimpulan dari penelitian ini adalah diketahui bahwa panjang span dari titik clamp elevation 0,610m ke - 7,620m yaitu 8,23m masih aman karena nilainya tidak melebihi MAFSL yaitu 16,042m dan dari titik clamp elevation -7,620m ke -15,00m panjang span juga masih aman yaitu 7,38m karena tidak melebihi MAFSL yaitu 21,517m.
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Subsea pipeline systems that work at a certain depth on the seabed will inevitably fail if faced with unstable environmental conditions such as the influence of waves and currents. The influence of these environmental conditions will cause Vortex Induced Vibration (VIV), if this conditions not analyzed when designing the pipe, it will cause a free span which will caused the failure of the pipe system. Therefore, it is necessary to calculate the Maximum Allowable Free Span Length (MAFSL) on the riser KLB platform. The riser is located at Offshore Platform North West Java approximately 80 – 200km North-East of Jakarta. The KLB platform is one of five platforms planned by Pertamina Hulu Energi Offshore Northwest Java (PHE ONWJ) to replace and install a new pipeline. The calculation of MAFSL on the riser at KLB platform that has an outer diameter of 323.9mm and a length of 1km is using MathCAD software, this calculation also using codes and standards based on DNV RP C205 and DNV 1981. The conclusion of this analysis is that it is known that the length of the span from the clamp elevation point of 0.610m to -7.620m which is 8.23m is still safe because the value does not exceed the MAFSL which is 16,042m and from the clamp elevation point -7.620m to -15.00m the length of the span is also still safe which is 7.38m because it does not exceed MAFSL which is 21.517m.

Item Type:	Thesis (Other)
Additional Information:	RSKe 665.544 Ham a-1 2022
Uncontrolled Keywords:	Vortex Induced Vibration(VIV), Free Span, In-line, Onset crossflow, Maximum Allowable Free Span Length. Vortex Induced Vibration(VIV), Free Span, In-line, Onset crossflow, Maximum Allowable Free Span Length.
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	22 May 2026 02:57
Last Modified:	22 May 2026 02:58
URI:	http://repository.its.ac.id/id/eprint/133337

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