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ITS » Master Theses » Teknik Kes & Keselamatan Kerja
Posted by jono@its.ac.id at 25/01/2010 12:46:06  •  4525 Views


ANALISA TEGANGAN KRITIS CONDENSOR CN-03 SHELL DI KILANG MINYAK PUSDIKLAT MIGAS CEPU BERDASARKAN STANDAR API 661

THE ANALYSIS CRUCIAL TENSITY IN CONDENSOR CN-03 SHELL IN OIL FIELD OF PUSDIKLAT MIGAS CEPU BASED STANDAR API 661

Author :
MAHMUDI ( 2103203806 )




ABSTRAK

Kondensor Cn-03 di Pusdiklat Migas Cepu merupakan salah satu instrumen produksi yang sangat penting dalam proses pengolahan minyak. Berdasarkan data inspeksi terbaru pada tahun 1996 diketahui ketebalan kondensor yang terjadi pada tahun tersebut adalah 10mm. Pada saat ini terjadi kebocoran pada bagian shell dekat dengan nozzlenya. Setelah diperbaiki dengan mengganti pelat shell kondensor dioperasikan kembali secara normal. Perbaikan tersebut tanpa mengevaluasi penyebab kerusakan. Agar fungsi kondensor tetap terjaga dan dalam operasi tetap aman maka perlu dikaji tegangan kritis yang timbul pada pelat kondensor. Analisis dalam tesis ini membahas bagaimanakah kondisi kondensor baru terhadap pembebanan inner pressure maksimum yang diberikan. Metode yang dilakukan untuk analisa tegangan kritis di kondensor Cn-03 shell di kilang minyak Pusdiklat Migas Cepu adalah memakai metode elemen hingga. Dari pemodelan dilakukan solusi struktural secara komputasi numerik menggunakan software ANSYS. Tegangan maximum yang terjadi akibat beban pressure sebesar 65175 MPa. Hal ini masih jauh di bawah tegangan ijin. Lokasi titik kritis berada di dekat kaki nozzle. Dari hasil perhitungan tebal plate minimum yang masih di ijinkan adalah 37 mm. Corrosion allowance untuk pengoperasian kondensor Cn-03 adalah 63 mm.. Dari simulasi yang dilakukan didapatkan bahwa kondensor dengan ketebalan 37 mm akan mengalami kegagalan setelah diberikan pembebanan MAWP sebesar 11 x 10-1 MPa .Lokasi intensitas tegangan terjadi dan terkonsentrasi pada sambungan shell dengan nozzle. Sedangkan perawatan kondensor Cn-03 untuk memperpanjang umur kondensor Cn-03 lebih lama dan aman dalam operasi


ABSTRACT

Condensor Cn-03 in Pusdiklat Migas Oil and Gas Education and Training Centre Cepu is one of the most important equipment in oil refinery processes.. Based on the newest inspection data in 1996 it is found that the thickness of that condenser is about 10 mm. This time there is a leak on the shell near its nozzle. After repaired by changing the shell plate the condensor is normally operated again. That repairation is without evaluating the cause of the damage. In order to make the condensors function stable and safe in its operation it needs to analyze the critical stress which is occurred on the condensor plate. The analysis of this thesis will discuss how behaviour of the condenser toward the given maximum inner pressure load. The method used in analyzing the critical stress in condensor Cn-03 shell in oil field of Pusdiklat Migas Cepu is Finite Element Methed. The structural solution using numeric computation of ANSYS software is done toward the model. The maximum stress happens because of the pressure load of 65.175 MPa. It is still under the permitted stress The crucial point is located near the nozzle leg. From the calculating result the minimum permitted thickness of plate is 3.7 mm. The corrosion allwance to operate condensor Cn-03 is 6.3 mm. From the simulation it is found that the condensor with the thickness of 3.7 mm will find failure after given MAWP load of 1.1 x 10-1MPa. The intensity location of stress is happened and concentred on the joint of shell and nozzle. Meanwhile the maintenance of condensor Cn-03 is done to lengthen the age of condensor Cn-03 and to make it safe operation.



KeywordsCrucial tensity, inner pressure, shell, MAWP
 
Subject:  Condensers (Steam)
Contributor
  1. Ir.Yusuf Kaelani, MSc.E
Date Create: 25/01/2010
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Master-3100006027842
Collection ID: 3100006027842
Call Number: RTM 621.197 Mah a


Source
Master Theses, Mechanical Engineering, RTM 621.197 Mah a,2006

Coverage
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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 - Open Access ]

  1.  ITS-Master-8357-2103203806-kesimpulan.pdf - 39 KB




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