Analisa Kegagalan Shaft High Pressure Pump Sea Water Reverse Osmosis di Unit Bisnis Pembangkitan Labuhan Angin

Napitupulu, Wandi Pagar Asi (2026) Analisa Kegagalan Shaft High Pressure Pump Sea Water Reverse Osmosis di Unit Bisnis Pembangkitan Labuhan Angin. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

UBP Labuhan Angin hadir menyediakan energi listrik untuk memenuhi kebutuhan masyarakat dan industri. Dalam upaya pemenuhan kebutuhan listrik dan menjaga kesiapan pembangkit, pengolahan air sebagai bahan utama yang akan diubah menjadi uap kering menjadi hal kritikal untuk diperhatikan. Pada proses pengolahan air tersebut, high pressure (HP) pump hadir sebagai pompa yang berfungsi untuk meningkatkan tekanan kerja air laut menuju ke vessel sea water reverse osmosis (SWRO) untuk menciptakan proses osmosis balik. Adapun terganggunya kinerja HP pump sendiri akan berdampak pada ketersediaan air umpan boiler. Objek kegagalan pada penelitian ini adalah patahnya poros HP pump yang terjadi dalam jangka waktu 5-14 hari operasi yang mana jauh dari standart pabrikan. Untuk itu, peneliti melakukan analisa dan mengidentifikasi mekanisme penyebab dari terjadinya kegagalan tersebut dengan pengujian komposisi kimia, fraktografi, scanning electron microscopy (SEM/EDS), dan uji kekerasan. Adapun hasil analisa didapati bahwa yang kegagalan pada poros diawali oleh kesalahan pada tahap pemilihan jenis material yang tidak seusai rekomendasi pabrikan. Adapun crack initiation terjadi pada area root gear yang dicipu oleh stress concentration pada gear poros dimana selanjutnya retakan tersebut merambat karena adanya beban dinamik sehingga berpropagasi secara fatigue yang mana sisa area poros yang tidak mampu menahan beban akan patah secara getas (brittle).
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UBP Labuhan Angin provides electrical energy to meet the needs of the community and industry. In efforts to fulfill electricity demands and maintain plant readiness, water treatment, as the primary raw material to be converted into dry steam is a critical factor that requires careful attention. In this water treatment process, the high pressure (HP) pump functions to increase the working pressure of seawater toward the seawater reverse osmosis (SWRO) vessel to create a reverse osmosis process. Any disruption in the performance of the HP pump will directly impact the availability of boiler feedwater. The object of failure in this study is the fracture of the HP pump shaft, which occurred within an operational timeframe of 5–14 days, falling far short of the manufacturer's standard. Therefore, the researchers conducted an analysis and identified the mechanisms causing this failure through chemical composition testing, fractography, scanning electron microscopy (SEM/EDS), and hardness testing. The analysis results revealed that the failure of the shaft was initially caused by an error in the selection of the material type, which did not comply with the manufacturer's recommendations. Crack initiation occurred in the root gear area, triggered by stress concentration on the shaft gear. This crack subsequently propagated due to dynamic loading, exhibiting a fatigue propagation pattern, until the remaining cross-section of the shaft is unable to sustain the load and suffered a brittle fracture.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Analisa kegagalan, Poros, Fatigue, Pengolahan air, Failure analysis, Shaft, Fatigue, Water treatment
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Wandi Pagar Asi Napitupulu
Date Deposited:	05 Aug 2026 01:34
Last Modified:	05 Aug 2026 01:34
URI:	http://repository.its.ac.id/id/eprint/143529

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