ANALISIS TEGANGAN TERHADAP RISIKO TERJADINYA BUCKLING PADA PROSES PENGGELARAN PIPA BAWAH LAUT

NUGROHO, ANDHIKA HARIS (2014) ANALISIS TEGANGAN TERHADAP RISIKO TERJADINYA BUCKLING PADA PROSES PENGGELARAN PIPA BAWAH LAUT. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

Text 4210100090-Undergraduate_thesis.pdf - Published Version Restricted to Repository staff only Download (3MB) | Request a copy

Abstract

Dalam proses penggelaran pipa bawah laut, banyak sekali
resiko yang dapat mengakibatkan struktur pipa gagal, yang dapat
mengakibatkan kerugian waktu, material dapat berujung pada
kerugian berbentuk materi. Karena berbeda dengan instalasi pipa di
darat, penggelaran pipa bawah laut mendapatkan banyak pengaruh
dalam proses instalasinya, mulai dari tekanan dalam laut yang harus
di perhitungan besarnya, kecepatan arus, besarnya gelobang, dan
tentunya faktor kedalaman dasar laut yang bervariasi. Tugas akhir
ini dilakukan untuk mengestimasikan minimum bending stress
yang terjadi pada daerah kritis agar sesuai dengan kriteria desain
guna menghindari kegagalan pada proses instalasi dalam hal ini
terjadinya buckling pada beberapa segmen pipa. Metode instalasi
yang diamati ialah metode S-Lay. Dari hasil analisis pipa pada
kasus ini dapat disimpulkan instalasi pipa tidak mengalami
overstress maupun risiko local buckling serta propagation buckling
di daerah manapun, ini dikarenakan nilai tegangan yang terjadi pada
area sagbend dan overbend masih memenuhi kriteria, yakni masih
kurang dari 87% SMYS pipa untuk standart DNV OS F101
“Submarine Pipeline System” dan masih kurang dari 85% SMYS
pipa untuk standart DNV 1981 . Serta telah dilakukan validasi menggunakan software yang berbasis finite element yang untuk
menampilkan pergerakan pipa serta persebaran tegangannya, dan
pipa dapat dikatakan aman.

============================================================

In the process of deploying subsea pipelines, a lot of risks
that can lead the failure of pipe structurel.The risks can lead to loss
of time, materials and can influence the loss investment. The
deploying subsea pipeline is different with the onshore pipeline
installation, deployment of subsea pipelines gets a lot of influence
in the installation process. It begin from the internal deep sea
pressure should be calculated, flow velocity, the wave magnitude,
and a factor that varies of the sea depth floor. This final task is
performed to estimate the minimum bending stress that occurs in
the critical region to fit the design criteria in order to avoid failures
in the installation process in this case the occurrence of buckling is
in several segments of pipe. The installation method that will be
observed is S-Lay method. From the stress analysis in this case, it
can be concluded that overstress the pipe installation and the risk of
buckling and local buckling propagation in any area is not occur,
this is because the value of the stress in overbend and sagbend
areas is below the stress criteria, which is still less than 87% SMYS
pipe to DNV standard OS F101 "Submarine pipeline Systems "and
still less than 85% SMYS to DNV 1981 standard for pipeline. And
has been validated using Finite Element software to show the
movement of the pipe and the stress distribution. The conclusion on
this study is the pipeline that has been observed is safe.

Item Type:	Thesis (Undergraduate)
Additional Information:	RSSP 621.867 2 Nug a
Uncontrolled Keywords:	Laying, Stress, Overbend, Sagbend, Local Buckling, Propagation Buckling, Offpipe, Solidworks
Subjects:	T Technology > TS Manufactures > TS280 Pipe Bending, Tube Bending V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Anis Wulandari
Date Deposited:	12 Jan 2017 04:50
Last Modified:	12 Jan 2017 04:50
URI:	http://repository.its.ac.id/id/eprint/1514

Actions (login required)

View Item