EMAIL: PASSWORD:
Front Office
UPT. PERPUSTAKAAN
Institut Teknologi Sepuluh Nopember Surabaya


Kampus ITS Sukolilo - Surabaya 60111

Phone : 031-5921733 , 5923623
Fax : 031-5937774
E-mail : libits@its.ac.id
Website : http://library.its.ac.id

Support (Customer Service) :
timit_perpus@its.ac.id




Welcome..guys!

Have a problem with your access?
Please, contact our technical support below:
LIVE SUPPORT


Davi Wahyuni


Tondo Indra Nyata


Anis Wulandari


Ansi Aflacha




ITS » Undergraduate Theses » Teknik Kelautan
Posted by eny at 25/08/2009 14:57:13  •  4187 Views


NUMERICAL ANALYSIS DUE TO INFLUENCE VORTEX INDUCED VIBRATION ON FREESPAN OFFSHORE PIPELINE USING MATLAB

Author :
LEKSONO, BOY BARIADI 




ABSTRAK

Salah satu bagian penting dalam desain sebuah sistem pipa bawah laut adalah mempertimbangkan terjadinya freespan pada pipa bawah laut. Freespan harus mendapat perhatian khusus dalam proses desain pipa bawah laut karena kondisi ini dapat menyebabkan vibrasi atau biasa dikenal sebagai fenomena Vortex Induce Vibration VIV. Tugas akhir ini adalah melakukan analisa pengaruh VIV pada freespan pipa bawah laut Data yang digunakan merupakan data pipa Hess Indonesia-Pangkah Limited di perairan Ujung Pangkah. Analisis dilakukan dengan menggunakan perhitungan manual MATLAB berdasarkan code yang mengacu pada ASME B31.8 untuk analisa statis dan DnV RP F105 untuk analisa dinamis sedangakan untuk memodelkan VIV menggunakan software ORCA. Dari hasil analisa maka diperoleh panjang span yang diijinkan adalah panjang span yang terpendek dari perhitungan yaitu untuk KP Shore I II III IV V VI pada kondisi operasi adalah 17.28 m 20.41 m 20.34 m 14.04 m 16.41 m 13.65 m 13.17 m . Sedangkan Dari hasil analisa VIV diketahui bahwa frekuensi natural span pada pipa lebih besar dari frekuensi vortex. Aliran vortex yang terjadi pada disekitar pipa kurang teratur karena harga Reynold number antara 3.46.106 1.78.107. Harga reduced velocity Vr berdasarkan hasil analisis maka response yang terjadi adalah in-line response dan cross-flow response. In-line response terjadi pada harga 1.0 dengan syarat 1.2 UR 4.5 sedangkan cross-flow response terjadi pada harga 3.9 dengan syarat 5 UR 9 . Hasil ini menunjukkan pipa akan aman dioperasikan


ABSTRACT

One of the most essential parts on designing an offshore pipeline system is to consider the occurrence of freespan which will likely to take place on the pipes. Freespan must acquire special attention during the process of designing the offshore pipeline since such condition could cause vibration which is also well-known as the Vortex Induce Vibration VIV phenomenon. This thesis is intended to analyze the effect of VIV on the freespan offshore pipeline. Data being used is the Hess Indonesia-Pangkah Limited pipe data on the waters of Ujung Pangkah. Analysis was completed using manual calculation MATLAB based on the code which refers to ASME B31.8 for static analysis and DnV RP F105 for dynamic analysis whereas ORCA software is used to model VIV. The analysis conclusion shows that the length of the span permitted is the shortest length from the calculation on which case for KP Shore I II III IV V VI on operational condition is 17.28 m 20.41 m 20.34 m 14.04 m 16.41 m 13.65 m 13.17 m while it is acknowledged from the VIV analysis that natural span frequency on the pipe is bigger than vortex frequency. Vortex flow which occurs around the pipe is not steady due to the Reynold number value which is between 3.46.106 1.78.107. The value of reduced velocity Vr based on the analysis result will lead to in-line response dan cross-flow response. In-line response occurs on 1.0 value with 1.2 UR 4.5 condition while cross-flow response occurs on 3.9 value with 5 UR 9 condition. This result indicates the pipe will be safe to operate.



KeywordsFreespan ; Vortex induced vibration ; In-line response ; Cross-flow response
 
Subject:  Pipelines ; Underwater pipelines
Contributor
  1. Prof. Ir. SOEGIONO
    Ir. JOSWAN J. S., M.Sc.
Date Create: 25/08/2009
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-3100009035259
Collection ID: 3100009035259
Call Number: RSKe 621.867 2 Lek a


Source
Undergraduate Theses, Ocean Engineering, RSKe 621.867 2 Lek a, 2009

Coverage
ITS Community Only

Rights
Copyright @2009 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library.




[ Download - Summary ]

ITS-Undergraduate-3100009035259-5239.pdf




 Similar Document...




! ATTENTION !

To facilitate the activation process, please fill out the member application form correctly and completely

Registration activation of our members will process up to max 24 hours (confirm by email). Please wait patiently

POLLING

Bagaimana pendapat Anda tentang layanan repository kami ?

Bagus Sekali
Baik
Biasa
Jelek
Mengecewakan





You are connected from 10.199.6.2
using CCBot/2.0 (https://commoncrawl.org/faq/)



Copyright © ITS Library 2006 - 2021 - All rights reserved.
Dublin Core Metadata Initiative and OpenArchives Compatible
Developed by Hassan