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ITS » Undergraduate Theses » Teknik Kelautan
Posted by aprill@is.its.ac.id at 25/02/2016 09:32:44  •  965 Views


ANALISIS KELELAHAN AKIBAT ALIRAN INTERNAL DAN BEBAN EKSTERNAL PADA PIPA BAWAH LAUT YANG MENGALAMI FREESPAN

FATIGUE ANALYSIS CAUSED BY INTERNAL FLOW AND EXTERNAL LOAD ON THE SUBSEA PIPELINE THAT EXPERIENCING FREESPAN

Author :
SYARIF, HILMAN ( 4310 100 004 )




ABSTRAK

Aliran eksternal dan internal fluida dalam pipa yang dapat menyebabkan vibrasi sehingga berakibat pada kelelahan pada pipa bawah laut telah selesai dianalisis. Analisis dilakukan dengan mempertimbangkan variasi flowrates aliran internal fluida serta panjang freespan. Freespan pipa bawah laut yang digunakan dalam analisis ini adalah yang tidak memenuhi kriteria screening kelelahan menurut DNV RP F-105. Berdasarkan hasil screening panjang freespan yang harus dilakukan analisis kelelahan lebih lanjut adalah freespan dengan panjang 13 meter atau lebih. Kemudian dipilih tiga freespan yang tidak memenuhi kriteria screening kelelahan yaitu freespan dengan panjang 23 meter 30 meter dan 36 meter. Selanjutnya menghitung tegangan pada freespan akibat variasi beban pressure akibat fluida yang mengalir di dalam pipa dan arus yang mengenai pipa. Pressure tersebut didapat dari output software CFD. Pada hasil analisis ini didapatkan bahwa peningkatan flowrates pada inlet berbanding lurus dengan pressure yang dihasilkan oleh fluida sehingga tegangan yang dihasilkan juga bertambah besar. Semakin besar tegangan yang dialami freespan umur kelelahannya akan semakin kecil. Sehingga bisa disimpulkan semakin besar flowrates semakin kecil umur kelelahan freespan pipa bawah laut.


ABSTRACT

Fluid external and internal flow in the pipeline which can cause vibration resulting in subsea pipeline fatigue has been completely analyzed. Analysis is done by considering the variation of fluid internal flow flowrates and freespan length. Subsea pipeline freespan used in this analysis are those which do not fulfill the fatigue screening criteria in accordance with DNV RP F-105. Based on screening result freespan length that must be done the further analysis are freespan with the length of 13 meter or more. Then three freespan which do not fulfill the fatigue screening criteria are chosen freespan with the length of 23 meter 30 meter and 36 meter. The next step is counting the freespan stress caused by pressure load variation as a result of fluid flowing in the pipeline and flow hitting the pipeline. That pressure is obtained from CFD software output. From this analysis result it is shown that the enhancement of flowrates at the inlet is directly proportional with pressure produced by fluid so that stress produced is bigger. The bigger the stress experienced by freespan the smaller the fatigue life. It can be concluded that the bigger the flowrates the smaller the fatigue life of subsea pipeline freespan.



Keywordsfreespan; aliran internal; aliran eksternal; flowrates; tegangan; umur kelelahan
 
Subject:  jaringan pipa bawah laut
Contributor
  1. Yoyok Setyo Hadiwidodo, S.T., M.T., Ph.D
  2. Ir. J. J. Soedjono, M.Sc
Date Create: 25/02/2016
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-43001150008371
Collection ID: 43001150008371
Call Number: RSKe 620.112 6 Sya a


Source
Undergraduate Thesis of Offshore Engineering, RSKe 620.112 6 Sya a, 2016

Coverage
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Rights
Copyright @2016 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Undergraduate-40359-4310100004-abstract_id.pdf - 177 KB
  2.  ITS-Undergraduate-40359-4310100004-abstract_en.pdf - 234 KB
  3.  ITS-Undergraduate-40359-4310100004-conclusion.pdf - 421 KB




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