Analisa Perhitungan Sisa Umur Pakai Pipa Gas Menggunakan Metode Indirect dan Direct Assessment pada PT Perusahaan Gas Negara Tbk

Putri, Laras Aditya (2024) Analisa Perhitungan Sisa Umur Pakai Pipa Gas Menggunakan Metode Indirect dan Direct Assessment pada PT Perusahaan Gas Negara Tbk. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Salah satu faktor dominan penyebab kegagalan operasional pada jaringan pipa distribusi dan transmisi gas umumnya disebabkan oleh korosi. Korosi adalah penurunan kualitas yang disebabkan oleh proses reaksi kimia bahan logam dengan unsur unsur lain yang terdapat di alam. Korosi dapat terjadi kapan saja dan tidak dapat dihindari akan tetapi korosi ini dapat dikendalikan dengan menggunakan sistem proteksi sehingga masa pakainya dapat lebih lama. Untuk itu dibutuhkanlah suatu strategi untuk mengetahui sisa umur pakai pada jaringan pipa distribusi dan transmisi gas. Sehingga, penelitian ini dilakukan untuk menganalisa sisa umur pakai pipa gas menggunakan metode indirect assessment yaitu pengambilan data lapangan menggunakan Pipeline Current Mapping (PCM), Close Interval Potential Survey (CIPS), dan Alternative Current Voltage Gradient (ACVG) /Direct Current Voltage gradient (DCVG). Kemudian dilakukan analisa lebih lanjut untuk menemukan indikasi coating defect/metal contact dan menilai kinerja proteksi katodik dari jalur pipa yang dilakukan indirect assessment. Selanjutnya menggunakan metode direct assessment yang dilakukan dengan penggalian langsung di beberapa lokasi pipa yang terindikasi terdapat coating defect/metal contact. Setelah dilakukan analisa ditemukan ada 5 titik dengan tingkat defect medium to large yaitu pada #CD83, #CD89, #CD97, #CD11, #CD71. Hasil perhitungan menunjukkan bahwa sisa umur pakai pipa pada titik #CD83, #CD89, #CD97, #CD11 adalah rata-rata lebih dari 100 tahun. Sedangkan, pada titik #CD71 tidak dapat dilakukan perhitungan dikarenakan pipa berada dalam casing sehingga tidak dapat diukur secara aktual.
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One of the dominant factors causing operational failures in gas distribution and transmission pipelines is generally caused by corrosion. Corrosion is a decrease in quality caused by the process of chemical reactions of metal materials with other elements found in nature. Corrosion can occur at any time and cannot be avoided, but this corrosion can be controlled by using a protection system so that its service life can be longer. For this reason, a strategy is needed to determine the remaining service life of the gas distribution and transmission pipelines. So, this research was conducted to analyze the remaining service life of gas pipelines using the indirect assessment method, namely field data collection using Pipeline Current Mapping (PCM), Close Interval Potential Survey (CIPS), and Alternative Current Voltage Gradient (ACVG) / Direct Current Voltage gradient (DCVG). Then further analysis is carried out to find indications of coating defects / metal contact and assess the cathodic protection performance of the pipeline carried out indirect assessment. Furthermore, using the direct assessment method which is carried out by direct excavation in several pipe locations that are indicated to have coating defects / metal contact. After the analysis, there are 5 points with medium to large defect levels, namely at #CD83, #CD89, #CD97, #CD11, #CD71. The calculation results show that the remaining life of the pipe at points #CD83, #CD89, #CD97, #CD11 is an average of more than 100 years. Meanwhile, at point #CD71 no calculation can be done because the pipe is in the casing so it cannot be measured actually.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	Pipa, Korosi, Sisa Umur Pakai, Indirect Assessment, Direct Assessment, Pipe, Corrosion, Remaining Life
Subjects:	T Technology > T Technology (General) > T174.5 Technology--Risk assessment.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	LARAS ADITYA PUTRI
Date Deposited:	07 Aug 2024 07:39
Last Modified:	07 Aug 2024 07:39
URI:	http://repository.its.ac.id/id/eprint/110384

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