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"ABSTRAKPenelitian ini bertujuan untuk menganalisis pengaruh korosi atmosferlingkungan air laut terhadap disain ketebalan pipa penyalur. Dilakukan pengujianuji komposisi dan uji tarik untuk mengetahui indentifikasi pipa penyalur sesuaidengan API 5L grade B. kemudian dilakukan pengukuran ketebalan aktual pipauntuk mengetahui sisa umur pakai, dilakukan pengujian korosi dengan metodasalt spray dan pengujian lapangan berdasarkan data yang ada, mereview danmenganalisa data pipeline untuk mengetahui nilai risk tertinggi yang dijadikanasumsi dasar ketebalan pipa untuk daerah yang akan dijadikan tempat jalur pipapenyalur. Hasil kalkulasi, sisa umur berdasarkan ketebalan pipa API 5L grade Bdapat layak operasi. Dengan laju korosi 0.67 ipy maka ketebalan untuklingkungan air laut adalah 0.71 inci. dan hasil perhitungan risk tertinggi adalah4.02 maka ketebalan yang tepat adalah 0.51 inci. Dengan ketebalan jauh dariketebalan nominal maka dianjurkan pipa yang melewati laut atau bermalamhingga berhari-hari di dermaga atau pelabuhan perlu dilakukan Coating agar padasaat pemasangan tidak mengalami kemunduran disain.

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ABSTRACTThe main aim of this experiment is to analyze the influence of atmosphericcorrosion of sea water environment to the thickness design of the conduit. Testsperformed are the composition test and tensile test to determine the identificationconduit in accordance with API 5L grade B. Thereafter, the actual thickness ofthe pipe is measured to determine the remaining life, corrosion testing performedby the method of salt spray and field testing based on existing data. The pipelinedata are reviewed and analyzed to determine the highest risk to be the basicassumption thickness of the pipe to be used in the area of the supplier pipeline.The results of calculation of the pipeline remaining life based on the thickness ofthe API 5L grade B have a can reasonable operated. With the corrosion rate of0.67 (ipy) thickness for seawater environment is 0.71 inches and from the riskmanagement, highest risk calculation is 4.02 with the proper thickness is 0.51inches. With a thickness far from the nominal thickness of pipe, it is recommendedfor the pipes, that are distributed through the sea till stay up for days on the pieror port, to be coated so by the time of installation it will not experience a setbackdesign."

"Penelitian ini bertujuan untuk menganalisis kelayakan operasional jalur pipa kondensat material API 5L Grade B terhadap disain sistem proteksi katodik. Verifikasi disain dilakukan pada data-data sekunder seperti hasil survey resistivitas tanah; disain awal sistem proteksi katodik; potential logger saat pemasangan, setelah pemasangan, satu bulan setelah pemasangan, serta hasil komisioning; hasil perhitungan umur sisa; dan hasil pengujian anoda korban. Pengujian yang dilakukan adalah uji tarik dan uji komposisi kimia untuk menganalisis kelayakan konstruksi material API 5L Grade B serta uji metalografi dan laju korosi untuk menganalisis kelayakan disain sistem proteksi katodik pada jalur pipa kondensat material API 5L Grade B. Dari hasil verifikasi pengujian dengan komisioning menunjukkan bahwa sisa umur pakai memenuhi design life. Guna meningkatkan faktor keamanan, maka perlu dilakukan modifikasi disain dalam hal jumlah anoda korban magnesium 32 lbs yang diperlukan dari 96 batang menjadi 100 batang. Dari hasil perhitungan most allowable operating pressure (MAOP), pengujian tarik, dan pengujian komposisi kimia menunjukkan material API 5L Grade B dapat dinyatakan layak secara konstruksi sebagai material pipa kondensat. Sementara itu, dari hasil uji metalografi dan laju korosi menunjukkan sistem proteksi katodik layak secara disain untuk dipasang pada jalur pipa kondensat dengan material API 5L Grade B. Secara umum, jalur pipa kondensat dengan material API 5L Grade B yang dipasangi sistem proteksi katodik dapat dinyatakan layak secara operasional.

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The main aim of this experiment is to analyze of the operational reliability of API 5L Grade B material condensate pipeline using cathodic protection system. Design verfication was done by the secondary datas such as: soil resistivity; cathodic protection system design before verification; installation, before installation, one month after installation, and commissioning test potential loggers; remaining life assessment; and sacrificial anode laboratory test results.

Tensile test and chemical composition test were done to analyze of constructional reliability of API 5L Grade B materials. Metallography and corrosion rate tests were done for analyzing of design reliability of condensate pipeline using cathodic protection system.

The result of design verification showed that according to commissioning test, the cathodic protection system was reliable operationally, but, to increase safety factor, it is necessary to redesign of quantity of 32 lbs magnesium anodes from 96 pieces to 100 pieces.

The result of most allowable operating pressure (MAOP) calculation, tensile test, and chemical composition test showed that API 5L Grade B material was reliable constructionally as a condensate pipeline material.

The result of metallography and corrosion tests showed that cathodic protection system design was reliable to protect API 5L Grade B condensate pipeline from the external corrosion. Generally, API 5L Grade B condensate pipeline with cathodic protection system installed was reliable operationally."