Pompa sentrifugal banyak digunakan sebagai mesin bantu produksi di industri proses. Pompa ini perlu dilakukan inspeksi getaran agar jika terjadi gejala kerusakan dapat dideteksi sedini mungkin, sehingga kerusakan lebih lanjut dan kerugian akibat berhentinya mesin dapat dicegah. Getaran sangat sesuai untuk mendeteksi gangguan pada pompa sentrifugal. Informasi karakteristik gejala kerusakan pada pompa masih relative sedikit, oleh karena itu diperlukan pengujian untuk mengetahui karakteristik getaran akibat beban atau gangguan tiruan. Alat ukur yang digunakan vibration accelerometer berikut data akuisisi. Metode analisis yang digunakan adalah amplitude magnitude, comparative dan descriptive. Obyek yang digunakan untuk pengujian yaitu Pompa sentrifugal yang dilengkapi dengan frequency regulator. Pengujian dilakukan dengan cara mengatur katup pada sisi hisap (suction) untuk simulasi gangguan kavitasi dan pengaturan katup sisi buang (discharge) untuk pembebanan dengan besar penutupan 0o, 10o, 20o, 30o dan 40o. Hasil yang didapat dari Pengujian getaran berupa karakteristik getaran pompa sentrifugal akibat variasi beban, simulasi gangguan kavitasi dan putaran yang didasarkan grafik amplitude, time domain dan frequency domain serta spektrum getaran dan dapat digunakan sebagai referensi untuk memonitor kondisi pompa sentrifugal. Berdasarkan hasil pengukuran dan analisis, amplitudo getaran pada pompa sentrifugal mengalami peningkatan seiring dengan meningkatnya perubahan beban, simulasi gangguan kavitasi dan putaran. Nilai amplitudo yang mengalami peningkatan terdeteksi pada frekuensi fundamental, dimana karakteristik getaran pompa sentrifugal akibat perubahan beban terletak pada frekuensi fundamental ke 6 dan 7, akibat gangguan simulasi kavitasi terletak pada frekuensi fundamental ke 6 dan akibat perubahan putaran terletak pada frekuensi fundamental ke 6 serta terjadi pergeseran frekuensi pada daerah amplitudo yang memuncak/tinggi. Kata Kunci : Pompa sentrifugal, getaran, amplitude, time domain, frequency domain

Centrifugal pump is widely used as a production auxiliary machine in the process industries. This pump needs to get vibration inspection so that in case of damage symptom happens, it can be detected as early as possible, so the further damage and the loss that caused by machine cessation can be prevented. The vibration is very suitable for detecting disruption in centrifugal pump. The damage symptoms characteristic information of the pump is still relatively few, therefore the test is necessary to find out the vibration characteristics caused by the load or the imitative disruption. The measuring instrument that is used is accelerometer vibration and its data acquisition. The analytical methods that are used are amplitude magnitude, comparative and descriptive. The object that is used for the test is a centrifugal pump that is equipped with a frequency regulator. The test is done by regulating valve on the suction side for cavitation disruption and valve on the exhaust side for loading with large closure 0o, 10o, 20o, 30o and 40o. The result of the vibration test is centrifugal pump vibration characteristic due to load, cavitation fault simulation, and speed variation based on amplitude graph, time domain, and frequency domain and vibration spectrum that can be used as a reference for monitoring the condition of a centrifugal pump. Based on the results of measurement and analysis, the amplitude of vibration in centrifugal pumps has increased along with the increasing load, cavitation fault simulation and speed variation. Amplitude increased detected at the fundamental frequency, where the vibration characteristics of centrifugal pumps as a result of changes in the load lies in the fundamental frequency to 6 and 7, due to interference simulations of cavitation lies in the fundamental frequency to 6 and due to changes in speed lies in the fundamental frequency to 6 as well as a shift frequency amplitude culminating in the area/height . Keywords : centrifugal pumps, vibration, amplitude, time domain, frequency domain

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