Perancangan Ulang Pompa Sentrifugal Untuk Distribusi Molasses Di PT. Rejoso Manis Indo Blitar

Riyansyah, Nurul Faizin (2025) Perancangan Ulang Pompa Sentrifugal Untuk Distribusi Molasses Di PT. Rejoso Manis Indo Blitar. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Molases merupakan produk sampingan dari industri gula di PT. Rejoso Manis Indo (RMI) yang memiliki viskositas tinggi dan memerlukan sistem pemompaan yang andal. Pompa sentrifugal yang digunakan untuk mendistribusikan molases dari tangki W-Molasses ke W1-Molasses menunjukkan kinerja yang tidak optimal dan tidak mampu memenuhi debit yang diharapkan. Oleh karena itu, diperlukan perancangan ulang sistem pompa untuk meningkatkan efektivitas produksi. Tahapan pada proyek akhir ini meliputi perhitungan analitis Head efektif instalasi yang divalidasi dengan perhitungan numerik menggunakan perangkat lunak Pipe Flow Expert, koreksi performa pompa terhadap fluida kental, pemilihan pompa sentrifugal yang sesuai, serta perancangan detail komponen impeller dan volute. Hasil pada perhitungan berdasarkan nilai Head efektif instalasi (Heff) sebesar 52,971 m dan kapasitas 77 m³/jam, setelah dilakukan penambahan faktor keamanan dan koreksi viskositas didapatkan head setara air sebesar 59,45 m. Maka pompa sentrifugal yang dipilih adalah Grundfos NBG/NKG 80-50-200/219 dengan efisiensi 78,4% dan putaran 2900 rpm. Rancangan impeller yang sesuai, yakni impeller dengan tipe moderate specific speed impeller, semi-terbuka (semi-open) dengan diameter inlet 0,110 m dan diameter outlet 0,218 m, sudut kelengkungan sudu masuk 17°, sudut kelengkungan sudu keluar 25°, dan jumlah sudu 8 buah. Spesifikasi pasak dengan panjang 20 mm, lebar 8,8 mm, dan tinggi 4,4 mm, serta merekomendasikan bantalan SKF 6407 dengan prediksi umur pakai 2,7 tahun.
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Molasses is a highly viscous by-product of the sugar industry at PT. Rejoso Manis Indo (RMI) that requires a reliable pumping system. The existing centrifugal pump used to distribute molasses from the W-Molasses to the W1-Molasses tank exhibits suboptimal performance and fails to meet the expected flow rate. Therefore, a redesign of the pump system is necessary to improve production effectiveness. The stages in this final project include the analytical calculation of the effective installation head, which is validated by numerical calculation using Pipe Flow Expert software, pump performance correction for viscous fluids, selection of a suitable centrifugal pump, and the detailed design of the impeller and volute components. The results from the calculation, based on an effective installation head (Heff) of 52,971 m and a capacity of 77 m³/h, yielded an equivalent water head of 52.19 m after viscosity correction and adding the safety factor. The selected centrifugal pump is a Grundfos NBG/NKG 80-50-200/219 with an efficiency of 78,4% and a speed of 2900 rpm. The corresponding impeller design is a moderate specific speed impeller, semi-open type, with an inlet diameter of 0.110 m and outlet diameter of 0.218 m, an inlet blade angle of 17°, an outlet blade angle of 25°, and a total of 8 blades. Specifies a key with a length of 20 mm, width of 8,8 mm, and height of 4,4 mm, and recommends an SKF 6407 bearing with a service life of 2,7 years.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Molase, Pompa, Head Efektif, Impeller, Volute, Pump, Effective Head
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ903 Pumping machinery. T Technology > TJ Mechanical engineering and machinery > TJ919 Centrifugal pumps--Design and construction.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Nurul Faizin Riyansyah
Date Deposited:	04 Aug 2025 08:27
Last Modified:	04 Aug 2025 08:27
URI:	http://repository.its.ac.id/id/eprint/126744

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