Penelitian di bidang pemesinan dalam menguji tingkat kekasaran perlu dilakukan untuk mendapatkan hasil yang baik dalam proses pemesinan. Tujuan Penelitian ini adalah: menganalisis pengaruh feeding pada proses end milling surface terhadap tingkat kekasaran, untuk mengetahui parameter feeding yang dapat menghasilkan kekasaran yang optimal. Metode yang digunakan yaitu metode eksperimen. Variabel bebas dalam penelitian ini adalah variasi feeding dimana nilai feeding yang diambil adalah 150 mm/min, 300 mm/min, dan 450 mm/min serta 3 variasi material dengan tingkat kekerasan yang berbeda. Variabel terikatnya adalah tingkat kekasaran, sedangkan variabel kontrol adalah depth of cut (0,5 mm) dan kecepatan spindel (3000 Rpm). Sedangkan proses yang digunakan adalah proses CNC milling surface. Pengujian kekasaran menggunakan surface roughness tester. Berdasarkan penelitian yang telah dilakukan, feeding yang paling kecil memberikan hasil kekasaran yang baik.
Latent Heat Thermal Energy Storage (LHTES) is the method to store thermal energy by changing the phase of Phase Change Material (PCM). This method is being developed to store heat loss for increasing energy efficiency. In this paper, the effect of variation flow rate on the melting characteristics PCM was investigated by three-dimensional numerical simulation using ANSYS FLUENT 17. The set-up of this research was carried out on concentrically two cylindrical tubes with diameter outer tube 10 cm and length 60 cm while diameter inner tube 5 cm and length 50 cm. The inner tube is used as a PCM container and the outer tube which has bottom and top hole is used as Heat Transfer Fluid (HTF) circulation. Variation HTF or hot water flowrate was carried out by 4L / min, 8L / min and 12 L / min while the temperature is kept at 75oC, then flowed through bottom hole and out to top hole. From this study it was found that the variation flow rate did not have significant effect on the melting pattern, only the greater flow rate, the smaller melting time. Natural convection is the main role of heat transfer when melting.
Suar bakar atau Flare adalah perangkat untuk membakar gas buang yang dihasilkan oleh plant oil and gas maupun industri lainnya yang menghasilkan limbah gas beracun. Flare pada umumnya diinstall pada ketinggian sesuai desain yang telah di tentukan. Untuk proses installasi pada plant onshore akan mudah mengangkat flare ini dengan crane. Namun pada plant offshore, flare biasanya akan diletakkan pada ujung platform sehingga crane yang berada pada ujung platform yang lain tidak dapat menjangkau ke posisi installasi flare. Hal ini menyebabkan kita harus mendesain device tambahan untuk mengangkat flare yang dikirim dari jalur laut menggunakan kapal dan mampu menderek ke atas hingga mencapai ujung platform. Dalam pembuatan alat angkat, analisa yang dilakukan akan muncul data keadaan platform di lapangan, material yang digunakan, dimensi alat dan perhitungan statis yang dilakukan. Perhitungan manual tanpa trial running analysis software menghasilkan defleksi ketika produk selesai dibuat ketika dilakukan load test. Pada tugas akhir ini akan melakukan perbandingan antara perhitungan manual yang sudah dilakukan dengan kalkulasi software serta perbaikan desain agar kedepannya dalam memfabrikasi alat angkat flare tidak menimbulkan defleksi kembali. Walaupun menurut perhitungan manual dinyatakan aman dan memang pada software dinyatakan aman, tetapi pada desain manual terjadi defleksi diatas angka yang diizinkan sebesar 66.73 mm dan dilakukan modifikasi sehingga defleksi mencapai angka 29.06 mm.
According to the Ministry of Environment (KLH), Indonesia's average population produces 189 thousand tons of garbage per day. Of this amount, 15% is plastic waste or 28.4 thousand tons of plastic waste per day. The famous handling of plastic waste is 3R (Reduce, Reuse, Recycle). Reduce is reducing the purchase or use of goods made from plastic, especially disposable items. Reuse is the repeated use of plastic-based items. Recycle is recycling goods made of plastic. The method used in this design study is to use SolidWorks software by combining the literature study VDI221 to obtain a variant of the design results that will be used. The study results do a plastic bench machine that is integrated to produce plastic seeds, which are PET-shaped, which are extruded in a device that has been brewed. From the results of the design in the data processing and design specifications of the PET plastic waste-processing machine with the extruder method, the construction consists of several units, namely, Shredder unit, Extruder unit, Cutter unit, and Machine frame. The shredder unit serves to destroy plastic waste that is still intact in pieces before being processed in the extruder unit. The extruder unit functions to melt PET waste to be extruded using a screw. The cutter unit operates to cut processed extrusion waste into pellet granules. The engine frame is used to support the entire engine unit. The results of the Plastic Waste Extruder Machine design process with an Autodesk inventor are summarized in the following specifications: machine dimensions are 1625 mm long, 300mm wide, and 1325mm high; screw extruder uses a metering screw type with a diameter of 50.8mm (2 inches) with a length: diameter ratio of 20: 1, so the screw length is 1016mm, estimated throughput rate = 84 lb/h (42kg / h), the motor used is 5.5 PK (4 KW) with a rotation speed of 1450.
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