Majdi, Muhammad Aujul (2020) Mekanisme Penipisan Tube Superheater pada Pembangkit Tipe Tangentially Fired Pulverized Coal. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Boiler sebagai komponen utama dari Pusat Listrik Tenaga Uap (PLTU) diharapkan mempunyai tingkat keandalan yang tinggi. Keandalan tersebut salah satunya ditopang oleh program Boiler & HRSG Management (BHM). BHM mengelompokkan area-area komponen di dalam boiler menjadi 4 jenis damage status (Active, Incipient, Event Based, Passive) dan 3 jenis Inspection Prioritization Index (A, B, dan C). Area boiler yang wajib di-inspeksi pada setiap overhaul adalah area dengan klasifikasi damage status A dan IPI A. Inspeksi yang selalu dilakukan pada setiap overhaul di area tersebut adalah Ultrasonic Testing (UT) thickness. Data hasil pengukuran UT thickness tersedia sejak pertama kali implementasi BHM pada tahun 2013. Area yang diambil pada penelitian ini adalah area superheater yang berdasarkan data pareto loss PLTU Labuan outage akibat kebocoran boiler adalah area yang paling banyak mengalami kegagalan, dan pengenaan temperatur dan flow flue gas serta tekanan kerja yang tinggi. Data pengukuran thickness juga diseleksi lebih lanjut pada area superheater yang tidak terkena sootblower. Hasil analisa data menunjukkan adanya anomali trend penipisan berdasarkan kurva distribusi antar periode overhaul. Prediksi yang dibuat menghasilkan nilai thickness yang mendekati nilai aktual. Anomali tersebut disebabkan oleh ketidaktepatan prosedur pengukuran thickness. Pengamatan makroskopis dan mikroskopis pada sampel uji memperlihatkan mekanisme penipisan fly ash erosion pada extrados sisi eksternal pipa.
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Boiler as one of the main components of the Coal Fired Steam Power Plant (CFSPP) is expected to have a high level of reliability. One of the tools to maintain its reliability is Boiler & HRSG Management (BHM) program. BHM classifies the component areas in the boiler into 4 types of damage status (Active, Incipient, Event Based, Passive) and 3 types of Inspection Prioritization Index (A, B, and C). The boiler area that must be inspected for each overhaul is the area with damage status A and IPI A. The inspection that is always carried out for every overhaul in the area is Ultrasonic Testing (UT) thickness. Data measured by UT thickness is available since the first BHM implementation in 2013. The area taken in this study is the superheater area which according to the pareto loss Labuan PLTU is the majority cause of boiler failure, and because of the high flue gas temperature and flow and also high work pressure. Thickness measurement data was also selected further in the superheater area that was not affected by the sootblower. The results of the data analysis showed thinning trend anomaly based on the distribution curve between the overhaul periods. The predictions made provide thickness values that are insignificantly different from actual values. The anomaly is caused by the inaccuracy of the thickness measurement procedures. Macroscopic and microscopic observations on tube samples shows thinning mechanism of fly ash erosion on the external side of the pipe extrados.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTM 621.183 Maj m-1 |
| Uncontrolled Keywords: | Tube Erosion, Thinning Mechanism, Thinning Trend, Thickness Prediction, Procedures, Microsopic and Macroscopic Observation |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction T Technology > TJ Mechanical engineering and machinery > TJ263.5 Boilers (general) |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | MUHAMMAD AUJUL MAJDI |
| Date Deposited: | 06 Mar 2025 06:30 |
| Last Modified: | 06 Mar 2025 06:30 |
| URI: | http://repository.its.ac.id/id/eprint/75304 |
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