Petroleum is one of the natural resources that can produce energy both for fuel and for generating electricity. One of the most important and widely used equipment in this industry is a pump. A pump is a device for distributing fluids from one place to another. A centrifugal pump is a device for distributing move liquids from one place to another by converting the fluid's kinetic energy into potential energy through an impeller that rotates in the housing. The objective of this research is to analyze the damage of pump 024P108, which indicated high vibration due to using a high-speed shaft. The research is done by using an analytical method, using CFD Fluent analysis with flow discharge capacity under normal conditions and minimum flow conditions, and comparing the results by API 610. Afterward, the right maintenance will be known for the 024P108 centrifugal pump to reduce the high vibration that occurred in the pump. The pump is run at minimum flow with a flow rate of 22 m3/hr and the normal flow rate of the pump is 97.9 m3/hr so that the results show that the pump head has decreased to 198.74 m and the pressure drop has increased by 2.5995×105 Pa. The vibration test data shows that high vibration of 8.5 mm/s is produced by a minimum flow state of 22 m3/hr, this low fluid flow is the cause of high vibration on the pump. High vibration has an impact on pump performance, that is decreasing pump performance (efficiency) and if left continuously it can cause damage to the pump.
Centrifugal pump is a type of pump used in low viscosity fluids. Therefore centrifugal pumps are widely used in the petroleum industry and power plants. At the Residual Fuel Catalytic Cracking (RFCC) there are 103-P-509A and 103-P-509B centrifugal pumps that function as cosolvent circulation media on the 103-V-503 vessel. To circulate cosolvent 103-P-509A and 103-P-509B pumps are arranged in parallel. While the operation of the 103-P-509A, pump impeller has become porous and destroyed. So it is necessary to know the actual performance of the 103-P-509B pump through analysis with analytical methods to process data and then compare it to the design performance. After calculating and comparing with the design performance, the differential head increases by 0.2 m, the decrease in NPSHa and NPSHr are 53.6 m and 0.62 m, and the pump efficiency decreases by 2%. Cosolvent circulation process does not experience interference, but the time needed to circulate cosolvent becomes longer. It can be concluded that the impeller pump 103-P-509B is in good condition.
Electrical energy is one of the important energy needs in human life. To meet the electricity needs in the North Maluku area, it was planned to build a diesel power plant (PLTD) in the coastal area of Halmahera. In the activity of the power plant, it produces heat wastewater from the rest of the radiator cooling process. This study, conducted a numerical simulation to determine the thermal dispersion pattern of waste heat from PLTD cooling water in Halmahera waters. Modeling the dispersion of heat waste temperature of PLTD cooling water is carried out using the Ansys CFD (Computational Fluid Dynamics) method in 3D. The input data are in the form of heat water discharge of 4,000 tons/hour, with heat wastewater temperature 37.5 °C. Ambient seawater temperature is 30.5 °C and seawater density is 1022 kg/m3. Hydrodynamic modeling of oceanic currents is modeled with two variations, namely constant current of 0.4 m/s and UDF current. UDF currents have different current values for each depth with a current velocity of 0.005 m/s up to 0.4 m/s. The simulated results of a constant current show the spread of heat to the environment occurs as far as 210 m to the north of the discharge outlet. The highest temperature value is 37.14°C, the lowest is 30.8°C. For these UDF current models, the heat spread is 210 m to the north of the discharge outlet with the highest temperature value is 37.13°C the lowest is 30.61°C.
Alat transportasi berperan penting dalam mengangkut material konsentrat untuk diolah dalam pabrik smelter secara kontinyu. Peralatan tersebut dijaga agar selalu beroperasi tanpa ada kerusakan. Kerusakan alat dapat mengakibatkan terhentinya proses produksi. Oleh karena itu manajemen peralatan pabrik sangat penting, dengan melakukan maintenance secara berkala untuk menghindari kejadian yang tidak diinginkan. Permasalahan yang sering terjadi pada salah satu alat yaitu belt conveyor adalah adanya tumpahan material ketika beroperasi. Penelitian ini menerapkan metode Reliability Centered Maintenance untuk mengetahui solusi yang tepat atas permasalahan sehingga material belt conveyor memiliki kehandalan yang tinggi dan umur pakainya meningkat. Hasil penelitian menunjukkan bahwa failure mode yang terjadi pada belt conveyor merupakan kategori C dan memiliki persentase terbesar sehingga dampak kerugian ekonominya relatif kecil. Namun tetap demikian kemungkinan terjadinya outage pada plant tetap harus diperhatikan.
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