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The purpose of this research was to discover the various reasons of failures and appropriate repair options for the line ducting cleaning unit system at PT Pusri Palembang's NPK-1 production facility. The main cause of the failures was determined to be a deterioration of the ducting line material caused by corrosion on the inner side of the ducting pipe composed of SS400 carbon steel. We made investigation including an analysis of the thickness of the damaged ducting pipe, as well as a visual check. The investigation showed that the corrosion caused an average drop in pipe wall thickness of up to 70%, according to the findings. The fixed load superimposed on the ducting pipe and the carrying capacity of the piping affect ducting strength, but corrosion on the inner surface of the pipe, caused by direct contact with corrosive and hygroscopic process dust, reduces ducting wall strength against axial and lateral loads. Failure of this ducting pipe caused losses and unscheduled shutdowns of production process, and increased the repair costs also could increase the risk of human accidents. The suggestion as this investigation results is to upgrade the ducting pipe materials to the more corrosion-resistant materials, such as stainless-steel grade SS304. Other suggestion should be taken is also regularly to inspect the ducting cleanness for the internal of ducting and control the dust flow rate through the scrubbing system. As conclusion, the suggestions given are to mitigate the risk of corrosion impact by maintaini­­­­­­ng ducting strength within the minimizing ducting system failures and ensuring the NPK plant's operation reliability.

The purpose of this research is to calculate the effect of the screw extruder angle on the results of 3-dimensional printer filaments that are printed using a single screw extrusion machine. The machine parameters used in this study were: pull speed 16 rpm, extrusion speed 28 rpm, extrusion mold diameter of 2 mm, and temperature of 180oC. The material used is recycled HDPE plastic. While the tilt angle of the screw in the research conducted by providing 5 variants of the angle of inclination (0o, 10o, 15o, 20o, 25o) where the diameter of the screw shaft used is the same. Data analysis was carried out using a simple linear regression method. Where the results obtained were: 1) the smallest filament diameter was 0.9 mm when using a screw with an angle of 0o, and 2) the highest diameter was 1.86 mm when using a screw with an angle of 25º. The conclusion obtained is that the tilt angle of the helical screw affects the results of recycled HDPE plastic extrusions, where the effect of the screw angle tilt is directly proportional to the filament diameter. In other words, with the addition of the tilt angle of the screw, the diameter of the resulting filament will also increase. In addition, based on the results of measuring the diameter of the filament, the conclusion that can be drawn is that with the increase in the diameter of the extrusion result, the outflow obtained will also be greater.

Batok Kelapa merupakan salah satu bahan yang dapat diproses dalam pembuatan asap cair. Proses produksi arang dari batok kelapa secara tradisional yaitu dengan metode drum klin berpotensi menimbulkan polusi udara. Prototipe penyulingan asap cair berbasis microkontroller bertujuan untuk membantu para pembuat arang guna untuk meminimalisisr potensi polusi udara pada para petani tersebut serta menambah pendapatan selain dari proses penjualan arang. Hasil pengujian prototipe diharapkan dapat meningkatan hasil produksi asap cair dibandingkan dengan menggunakan air yang bersuhu ± 29°C, dimana dengan menggunakan refrigerasi dimana suhu air akan diturunkan sampai 15°C yang basis pengontrolannya secara mictrokontoller yang di program dengan menggunakan aplikasi arduino. Berdasarkan hasil pengujian prototipe mesin penyuling asap cair di Desa Desa Tanjung Lago Kabupaten Banyuasin diperoleh produk berupa asap cair tanpa sistem refrijerasi sebanyak 203 ml dan penyulingan dengan menggunakan sistem refrijerasi sebanyak 375 ml asap cair.

The microcontroller-based liquid smoke distillation device aims to help farmers who produce liquid smoke where liquid smoke is used to freeze rubber latex in order to increase the results of making liquid smoke by using refrigeration technology applications whose control base uses Arduino hardware which is programmed using the matlab application so that has a positive impact in the marketing process of the sales of smoke looking for which previously used water with a temperature of ± 29°C. The process of designing tools takes advantage of CAD software while manufacturing uses drilling machines, hand grinding machines, electric welding machines, and hand tools. After manufacturing, the prototype of the tool will be tested in the laboratory to see the work function of the tool.

Recently, liquid smoke is widely used for various needs, both for food purposes and for freezing rubber latex. Liquid smoke began to grow due to the large demand, also using biomass / waste as a base material. Immediate production results are needed by the condensation process. The application of the refrigeration system guides the temperature of the air which is used as a cooling medium in the condensation process during the process of making liquid smoke. This study uses coconut shell as raw material for pyrolysis, and there are 4 temperature variations that are applied in the liquid smoke production process. First without a refrigeration system, the application of a refrigeration system with temperature variations of 22 ° C, 18 ° C and the last one is 15 ° C. The data is taken every 30 minutes for 6 hours. Based on the research results, it was found that the maximum production results using the refrigeration system at an air temperature of 15 ° C, resulted in 375 ml of liquid smoke.