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ITS » Paper and Presentation » Teknik Kelautan
Posted by aprill@is.its.ac.id at 12/02/2016 08:51:21  •  666 Views


DESIGN OF RISER AND SUBSEA PIPELINE EXPANSION SPOOL CASE STUDY KILO FIELD PT. PERTAMINA HULU ENERGI OFFSHORE NORTH WEST JAVA

PERANCANGAN RISER DAN EXPANSION SPOOL PIPA BAWAH LAUT STUDI KASUS KILO FIELD PT. PERTAMINA HULU ENERGI OFFSHORE NORTH WEST JAVA

Author :
LESMANA, HIDAYAT WUSTA ( 4310 100 028 )




ABSTRAK

Ada beberapa tahap yang harus dilakukan dalam perancangan pipa bawah laut riser maupun spool dog-leg. Pada umumnya pada pipeline department dalam perusahaan-perusahaan engineering memulai desain pipeline dengan tahap routing perhitungan tebal pipa atau riser perhitungan stabilitas pipa di bawah laut perhitungan ekspansi perhitungan cathodic protection dan perhitungan bentang bebas pipa. Setelah itu dilakukan pemodelan pada software. Adapun perhitungan seperti head loss pressure drop sampai pada tahap penentuan diameter luar pada umumnya dilakukan oleh process department. Hasil yang didapat pada perhitungan tebal pipa adalah 7.70 mm untuk pipeline dan 9.06 mm untuk riser dan spool. Sedangkan tebal pipa nominal yang dipilih berdasarkan standard adalah 8.2 mm untuk pipeline dan 9.5 mm untuk riser dan spool. Ekspansi yang terjadi pada ujung pipeline KC adalah 77 mm dan pada ujung pipeline KA adalah 67 mm. Sedangkan panjang spool minimal yang dibutuhkan berdasarkan ekspansi yang terjadi adalah 10.05 m. Berdasarkan hasil perhitungan stabilitas di bawah laut tebal lapisan beton yang dibutuhkan adalah 30 mm. Sedangkan untuk perhitungan free span sampai pada tahap screening fatigue criteria didapatkan bahwa semua panjang span initial pada pipeline dan riser telah memenuhi kriteria. Pada pemodelan dengan software didapat bahwa model mengalami kegagalan pada member spool. Oleh karena itu dilakukan redesign dengan mengganti tebal pipa riser dan spool sesuai dengan pipe schedule yang lebih tebal. Setelah dilakukan pergantian tebal maka tidak didapatkan member yang gagal pada model dengan meninjau tegangan maksimal yang terjadi.


ABSTRACT

There are several steps that must be done in the design of subsea pipelines risers and spool dog-leg. Generally the pipeline department in the engineering companies starts the pipeline design phase with pipeline routing pipeline or riser thickness calculation on bottom stability calculation expansion calculations cathodic protection calculation and pipeline free span calculation. After these steps make the model of pipeline riser and spool using software. The calculations such as head loss pressure drop until determining the outside diameter is generally performed by process department. The thickness calculation result is 7.70 mm for pipeline and 9.06 mm for the riser and spool. The selected nominal pipe thickness based on the standard is 8.2 mm for pipeline and 9.5 mm for riser and spool. Expansion occurs at the end of the KC pipeline is 77 mm and at the end of the KA pipeline is 67 mm. The minimum required length of the spool based on the expansion that occurs is 10.05 m. Based on the on bottom stability calculation a required thickness concrete coating is 30 mm. As for the calculation of free span until the screening stage of the fatigue criteria was found that all the initial span length on the pipeline and riser has fulfill the criteria. The modeling result using autopipe software obtained that the model has failed on the spool member. Therefore the model must be redesign by replacing the pipe thickness riser and spool with the thicker thickness based on the pipe schedule. After replacing the thickness there is no member who fails by reviewing the maximum stress occurrences.



Keywordsekspansi; pipeline; riser; spool; wall thicknes
 
Subject:  jaringan pipa bawah laut
Contributor
  1. Ir. Imam Rochani, M.Sc
  2. Ir. Handayanu, M.Sc. Ph.D
Date Create: 12/02/2016
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-paper-43121150008316
Collection ID: 43121150008316
Call Number: RSKe 621.867 2 Les p


Source
Paper and Presentations, Offshore Engineering, RSKe 621.867 2 Les p, 2016

Coverage
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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-paper-39994-4310100028-paper.pdf - 779 KB
  2.  ITS-paper-39994-4310100028-presentation.pdf - 2096 KB




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