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ITS » Undergraduate Theses » Teknik Kelautan
Posted by setiawan04@its.ac.id at 31/05/2010 13:57:12  •  1729 Views


ANALISIS LAJU PERAMBATAN RETAK UNTUK JENIS KOROSI SCC PADA PIPELINE AKIBAT UNSUR H2S

CRACK PROPAGATION RATE ANALYSIS FOR STRESS CORROSION CRACKING ON PIPELINE DUE TO H2S

Author :
Falakh, Irwan fajrul ( 4305100065 )




ABSTRAK

Dalam industri minyak dan gas masalah korosi selalu menghantui karena pipa-pipa mengalirkan fluida hidrokarbon yang bertekanan tinggi dari sumur minyak ke unit proses sehingga rentan terjadi korosi retak tegangan Stress Corrosion Cracking apalagi jika hal ini disertai oleh keberadaan hidrogen sulfida dalam kandungan fuida hidrokarbon yang dialirkan dalam pipa. Retakan yang diakibatkan oleh SCC akan mengurangi kekuatan pada pipa sehingga umur operasi juga akan berkurang. Dalam tugas akhir ini dibahas tentang laju perambatan retak akibat pengaruh unsur H2S dengan menggunakan metode C-Ring test spesimen. Metode ini sesuai dengan NACE TM 0177 dan ASTM G38 dengan media pengorosi H2S dengan kadar 1 3 dan 5. Spesimen diberikan tegangan sebesar 80 SMYS Spesified Minimum Yield Strength atau sebesar 28000 psi. Pengujian dilakukan dengan variasi waktu 288 432 576 dan 720 jam. Untuk pengujian pada kadar H2S 1 laju perambatan retaknya adalah 10.9 956mday dengan panjang retak rata-rata berturut-turut untuk tiap variasi waktunya 350 393.33 423.33 dan 436.67 956m. Pada pengujian dengan kadar H2S 3 laju perambatan retaknya adalah 17.5 956mday dengan panjang retak berturut-turut 380 416.67 506.67 dan 610 956m. Sedangkan laju perambatan retak pada pengujian untuk kadar H2S 5 adalah 35.35 956mday dengan panjang retak berturut-turut 516.67 530 633.33 dan 1106.67 956m. Sedangkan untuk retakan yang terjadi pada penelitian ini adalah retak transgranular.


ABSTRACT

In oil and gas industri corrosion problem always be a serious problem because the pipes flow high-pressure hydrocarbon fluids from the well one to another. That is why pipe vulnerable occurs stress corrosion cracking. Moreover this is accompanied by sulfide hydrogen contained on hydrocarbon fluids that is flowed by pipe. Crack due to SCC will reduce the power of pipe so the life time will also decrease. On this thesis will be researched about the crack propagation rate due to H2S which is use specimen test methode. This methode accordance with NACE TM 0177 and ASTM G38 with H2S as corrosion maker that is content 1 3 and 5 H2S inside. Specimen was given stress 80 SMYS specified Minimum Yield Strength or 2800 psi. This test was done with several times variation of 288 432 576 720 hours. Test for 1 H2S the crack propagation rate is 10.9 956mday with average crack length continualy for every time variation is 350 393.33 423.33 and 436.67 956m. The test for 3 H2S crack propagation rate is 17.5 956mday with average crack length continually for every time variation is 380 416.67 506.67 and 610 956m. Then for crack corrosion rate 5 H2S is 35.35 956mday with average crack length continually for every time variation is 516.67 530 633.33 and 1106.67 956m. Crack that occurred in this research is transgranular crack type.



KeywordsH2S; Laju Perambatan Retak; SCC; C-Ring; Transgranular; NACE TM 0177; ASTM G38
 
Subject:  Pipa retak
Contributor
  1. Ir. Yeyes Mulyadi, M.Sc.
  2. Ir. Heri Supomo, M.Sc.
Date Create: 12/02/2010
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-3100010039685
Collection ID: 3100010039685
Call Number: RSKe 620.112 6 Fal a


Source
Undergraduate, Ocean Engineering, RSKe 620.112 6 Fal a

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-10810-Abstract_id.pdf - 40 KB
  2.  ITS-Undergraduate-10810-Abstract_en.pdf - 43 KB
  3.  ITS-Undergraduate-10810-Conclusion.pdf - 40 KB
  4.  ITS-Undergraduate-10810-Paper.pdf - 214 KB




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