ABSTRAKPanas Bumi merupakan sumber panas yang berasal dari lapisan magma di dalam tanah yang relatif tidak pernah berkurang, menjadikan panas bumi sebagai sumber energi yang terbarukan. Area sumur 6 lapangan panas bumi di Kamojang Jawa Barat memiliki 6 buah sumur produksi. Salah satu sumur produksi yang belum tereksplorasi yaitu Kamojang-68. Sumur ini memiliki nilai entalpi 2.778 / dan tekanan sebesar 11,86 bar dengan kandungan gas non-terkondensasi sebesar 0,81% berat uap. Tujuan dari penelitian ini yaitu merancang steam turbine yang sesuai dengan kondisi sumur Kamojang-68 dengan daya output 3 . Metode yang dilakukan yaitu pengumpulan data sumur produksi, analisis heat and mass balance, perhitungan ukuran utama turbin. Hasil perancangan diperoleh bahwa uap panas bumi pada sumur produksi Kamojang-68 termasuk tipe uap kering sehingga model konversi energi yang sesuai yaitu direct steam. Daya output pembangkit sebesar 3,02 dengan tekanan 6-6,5 bar masuk ke dalam steam turbine. Steam turbine yang dirancang dalam tujuh tingkat dengan efisiensi dalam relatif turbin sebesar 0,687. Kata kunci: Panas bumi, steam, turbine DIMAS A HALIM, ANWAR NURHARYANTO, UNGGUL S JATI ABSTRACTGeothermal is a source of heat that comes from the layer of magma in the soil which is relatively never reduced, making geothermal energy is a renewable energy source. The well area of 6 Kamojang geothermal fields in West Java has 6 production wells. One of the unexplored production wells is Kamojang-68. This well has an enthalpy value of 2.778 / and a pressure of 11.86 bar with a non-condensed gas content of 0.81% steam weight. The purpose of this study is to design a steam turbine that is in accordance with the conditions of the Kamojang-68 well with output power 3. The method used for design steam turbine was production well data collection, heat and mass balance analysis, calculation of the main turbine size. The results of the design showed that geothermal steam in the Kamojang-68 production well includes dry steam type so that the appropriate energy conversion model is direct steam. The generator output power is 3.02 with a pressure of 6-6.5 bar entering the steam turbine. Steam turbine is designed in seven levels with efficiency in the relative turbine of 0.687.

Pump units with a Caterpillar C27 engine with an EUI (Electronic Unit Injector) fuel system that often has low power due to filter clogging at PT. Sapta Indra Sejati. Filter cloggingoccurs due to due to the thickened biofuel content and creates a crust. If the machine has a problem, the mining process can be disrupted because the coal loading area is flooded. This study aims to create an additional system in the form of a automatic semi-returnless where the fuel return line is changed automatically into the filter because the fuel return is clean. The movement of the return control valve is regulated by a microcontroller which is programmed according to specifications and needs. The microcontroller used is Arduino Unowith pressure and temperature sensors. Arduino Uno is programmed when the engine will experience low power with a fuel pressure of 400 kPa then the return path is changed to semi returnless. With a change in the semi returnless path, the pressure becomes stable at 380 kPa and the engine RPM is stable with power that is still maintained. The advantages of semi-returnless system are that filter replacement costs can be reduced and production time is not interrupted.

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