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ITS » Undergraduate Theses » Teknik Informatika Ekstensi - S1
Posted by dee@its.ac.id at 09/05/2011 11:26:03  •  1858 Views


ANALISIS KEANDALAN SCANTLING CRANE PEDESTAL FPSO BELANAK TERHADAP BEBAN EKSTREM

RELIABILITY ANALYSIS OF CRANE PEDESTAL SCANTLING BELANAK FPSO DUE TO EXTREME LOAD

Author :
MINARTI, SUSI  ( 4306100021 )




ABSTRAK

FPSO Floating Production Storage and Offloading dalam operasinya men-dapatkan pengaruh signifikan dari beban lingkungan dan operasionalnya. Hal demikian juga akan mempengaruhi komponen-komponen struktur yang ada di atasnya termasuk struktur crane dan pedestalnya yang berfungsi sebagai fasilitas transfer logistik. Konstruksi crane pedestal beserta scantlingnya yang tersambung menerus ke lambung FPSO haruslah kuat menahan beban-beban yang terjadi sampai dengan pada kondisi ekstrem. Sehubungan dengan ini kita harus dapat menentukan kekuatan puncak atau ultimate strength dari scantling crane pedestal sehingga dapat memprediksi kegagalan akhirnya atau ultimate failure. Dalam penelitian ini kekuatan puncak scantling crane pedestal telah dikaji dengan metode deterministik dan metode probabilistik atau keandalan. Pada pengkajian dengan metode deterministik digunakan perangkat lunak ANSYS sedangkan pengkajian keandalan menggunakan simulasi Monte Carlo. Pemodelan beban dinamis FPSO akibat gelombang diselesaikan dengan perangkat lunak MOSES dan untuk mengetahui reaksi tumpuan pada crane digunakan perangkat lunak SACS. Penelitian dilakukan pada scantling crane pedestal pada FPSO Belanak yang berukuran diameter 5.0 m pada bagian bawah dan 3.0 m pada bagian atas dengan tinggi keseluruhan 44.8m mempunyai massa 251 ton dan terbuat dari baja berkekuatan puncak UTS400 MPa. Beban ekstrem yang dikenakan adalah merupakan efek dari gelombang Hs5.3 m angin Vavg4.8 ms dan beban angkat operasional 50 ton. Dari hasil analisa deterministik didapat nilai tegangan maksimum yang timbul akibat kombinasi ketiga beban ekstrem tersebut adalah 52.5 MPa. Dengan simulasi Monte Carlo pada kondisi ini ternyata diperoleh keandalan struktur sebesar K1.0. Dengan demikian dapat disimpulkan bahwa struktur akan tetap aman dalam kondisi ekstrem di lokasi operasinya. Untuk memperoleh indikasi kegagalan akhir beban ekstrem dinaikkan secara gradual sampai dengan batas kriteria basic utilization factor dari ABS sebesar 0.8UTS 320 MPa serta sampai dengan 1.0UTS 400 MPa dan berdasarkan hasil analisa dengan ANSYS dapat dilihat bahwa akibat beban ekstrem daerah kritis pada struktur scantling crane pedestal adalah pada sambungan antara pedestal dan lambung FPSO dan mode kegagalan yang terjadi adalah deformasi plastis. Hasil masing-masing menunjukkan keandalan scantling global K0.4454 dengan peluang kegagalan Pf0.5546 dan K0.0874 dengan Pf0.9126. Khusus pada daerah kritis mengacu pada kriteria ABS keandalan hanya dicapai sebesar K0.1014 dengan Pf0.8986.


ABSTRACT

FPSO Floating Production Storage and Offloading in its operation is signifi-cantly affected by the environmental as well as operational loads. Similarly this would also affect the structural components onboard of the FPSO including the crane and its pedestal structures which are preserved as the logistic transfer equipments. The crane pedestal structure together with the scantlings that extend to the FPSO hulls should be sufficiently strong to endure the loads up onto the extreme conditions. In this regards one should be able to determine the ultimate strength of the crane pedestal scantling and in turn to predict the level of its ulti-mate failure. In this investigation the ultimate strength of crane pedestal scantling has been evaluated through the implementation of deterministic and probablistic or reliability methods. The deterministic evaluation is performed by utilizing ANSYS software whereas the reliability evaluation is accomplished by means of Monte Carlo simulation. The modelling of dynamic loads due to waves on the FPSO was accomplished by using the MOSES software and to identify the crane support reaction by wielding the SACS software. Investigation has been carried out on the crane pedestal scantling attached to the Belanak FPSO sized 5.0 m diameter at the lower part and 3.0 m diameter on its upper part having a total height of 44.8 m with a total mass of 251 tons and fabricated out of a high strength steel of UTS400 MPa. The extreme loads are considered due to the wave of Hs5.3 m wind of Vavg4.8 ms and operational lifting of 50 tons. From the deterministic analysis it is found that the combination of those extreme loads yield a peculiar maximum stress of 52.5 MPa on the structure. By way of Monte Carlo simulation this condition eventually exhibits the reliability level of K1.0. Therefore it could be concluded that the structure would be safe under any predicted extreme condition in its operational site. In order to obtain a specific indication of the ultimate failure the load has been gradually increased up to the ABS criteria of basic utilization factor in the order of 0.8UTS 320 MPa and further as high as 1.0UTS 400 MPa and based on analysis with ANSYS we can observe that as a result of extreme load the critical area is on the connection between pedestal and FPSO hulls and the mode of failure that happened is plastic deformation. Respectively the simulation shows the global structure reliability decreases to K0.4454 or the corresponding probability of failure Pf0.5546 and K0.0874 or Pf0.9126. In particular to the critical area referring to the ABS criteria the reliability can only be attained as much as K0.1014 or Pf0.8986



KeywordsScantling crane pedestal; FPSO; Kekuatan puncak; Keandalan
 
Subject:  Konstruksi beton
Contributor
  1. Prof. Ir. Eko Budi Djatmiko, M.Sc, Ph. D
  2. Solihin, ST, MT
Date Create: 11/08/2010
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-3100010041364
Collection ID: 3100010041364
Call Number: RSKe 627.98 Min a


Source
Undergraduate Thesis of Offshore Engineering, RSKe 627.98 Min a, 2010

Coverage
ITS Community

Rights
Copyright @2010 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-14465-4306100021-Abstract_id.pdf - 193 KB
  2.  ITS-Undergraduate-14465-4306100021-Abstract_en.pdf - 193 KB
  3.  ITS-Undergraduate-14465-4306100021-Conclusion.pdf - 205 KB




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