Analisa Pengaruh Penutupan LCV Terhadap Kenaikan Gaya Hot Well Pump Menggunakan Simulasi Fluent

Hadi, Mu'ammar Thoyib (2009) Analisa Pengaruh Penutupan LCV Terhadap Kenaikan Gaya Hot Well Pump Menggunakan Simulasi Fluent. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangkit Listrik Tenaga Uap (PLTU) Gresik memiliki sistem sirkulasi asir dari kondensor menuju cooling tower kemudian kembali lagi ke kondensor. Untuk mengatur debit aliran dari kondensor menuju cooling tower, digunakan katup butterfly yang diberi nama LCV (Logic Control Valve). Sistem Pengendalian LCV adalah tipe diskrit dengan dead band 1 %. Adanya dead band mengakibatkan pergerakan LCV tidak halus, sehingga mengakibatkan perubahan kondisi aliran secara tibatiba. Masalah ini diperburuk dengan adanya overshoot tiap kali LCV menutup. Perubahan kondisi aliran diduga mengakibatkan pembebanan pada Hot Well Pum (HWP), sehingga menjadi penyebab kerusakan pompa. Pada penelitian tugas akhir ini dilakukan evaluasi pengaruh penutupan katup terhadap HWP dan pencarian alternative yang sesuai. Evaluasi dilakukan dengan cara melakukan pemodelan aliran pada sistem katup menggunakan perangkat lunak FLUENT. Setelah diketahui perubahan kondisi aliran akibat penutupan LCV, penelitian dilanjutkan dengan memodelkan aliran pada HWP menggunakan FLUENT. Hasil dari pemodelan aliran pada sistem katup adalah perubahan kondisi aliran. Kondisi aliran yang menjadi perhatian utama adalah perubahan laju aliran akibat penutupan katup. Hasil pemodelan aliran pada HWP adlah perubahan gaya yang terjadi pada impellemya akibat perubahan laju aliran massa. Hasil pemodelan kemudian dibandingkan dengan pemodelan sistem terdahulu dan sistem yang dikembangkan, sehingga didapatkan sistem aktuasi katup yang lebih baik
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The Gresik Steam Power Plant (PLTU) has an air circulation system from the condenser to the cooling tower and then back to the condenser. To regulate the flow rate from the condenser to the cooling tower, a butterfly valve called LCV (Logic Control Valve) is used. The LCV Control System is a discrete type with a 1% dead band. The presence of a dead band causes the LCV movement to be uneven, resulting in sudden changes in flow conditions. This problem is exacerbated by the overshoot every time the LCV closes. Changes in flow conditions are suspected to cause loading on the Hot Well Pump (HWP), thus causing pump damage. In this final project, an evaluation of the effect of valve closure on the HWP and a search for appropriate alternatives was carried out. The evaluation was carried out by modeling the flow in the valve system using FLUENT software. After knowing the changes in flow conditions due to the LCV closure, the research continued by modeling the flow in the HWP using FLUENT. The result of the flow modeling in the valve system is a change in flow conditions. The flow condition that is of primary concern is the change in flow rate due to the valve closure. The results of the flow modeling in the HWP are the changes in force that occur in the impeller due to changes in mass flow rate. The modeling results are then compared with previous system modeling and the developed system, resulting in a better valve actuation system

Item Type:	Thesis (Other)
Additional Information:	RSSP 620.106 4 Had a-1 2009 (weeding)
Uncontrolled Keywords:	LCV, gaya hot well, pump, fluent
Subjects:	Q Science > QC Physics > QC151 Fluid dynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	EKO BUDI RAHARJO
Date Deposited:	21 Nov 2025 06:26
Last Modified:	21 Nov 2025 06:26
URI:	http://repository.its.ac.id/id/eprint/128816

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