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All Journal Jurnal Surya Teknika Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Proksima
Putri Nawangsari
Universitas Riau
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Effect of Mold Material on Shrinkage of Investment Casting Wax Pattern Dedy Masnur; Harrianda Hudaya; Putri Nawangsari; Warman Fatra
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 66 No 2 (2022): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (588.16 KB) | DOI: 10.36842/jomase.v66i2.292

Abstract

Various attempts have been made to substitute metal as the wax pattern mold material due to manufacturing costs and time-consumption. This research investigates the linear and volume shrinkage on the wax pattern of gypsum, silicone rubber, and epoxy resin as alternative materials to metal molds. A nylon master pattern was made by machining. The master pattern size was set as a reference for dimensional comparison with the cast wax pattern. Wax pattern molds were created using the master pattern, namely gypsum, silicone rubber, and epoxy resin. Paraffin wax was heated up to 55˚C in metal, then poured into each wax pattern mold. The length, radius, inlet, and outlet diameter were measured using a profile projector, then the linear shrinkage was calculated. The volume shrinkage was obtained through the sample weighing. The results show that silicone rubber has the lowest linear shrinkage of any sample in contrast to its volume shrinkage.
Pengaruh Waktu Mixing Terhadap Kekerasan dan Keausan Pada Campuran Serbuk Soda Lime Glass dan Serbuk Piston Bekas Sebagai Material Alternatif Kampas Rem Non Asbestos Putri Nawangsari; Kaspul Anuar
Retii Prosiding Seminar Nasional ReTII ke-11 2016
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Penelitian mengenai material alternatif kampas rem sepeda motor banyak dikembangkan sebagai material pengganti kampas rem asbestos karena kampas rem asbestos menghasilkan zat karsinogen yang berdampak negatif terhadap kesehatan. Penelitian ini memanfaatkan limbah soda lime glass yang berasal dari limbah kaca dan limbah piston bekas sebagai material alternatif pengganti kampas rem asbestos. Serbuk limbah soda lime glass sebagai penguat, serbuk limbah piston bekas sebagai pengisi (filler), dan phenolic resin sebagai pengikat (binder). Komposisi campuran serbuk soda lime glass, serbuk piston bekas, dan serbuk phenolic resin adalah 20% , 40%, dan 40% berdasarkan fraksi volume dengan memvariasikan waktu mixing, yaitu 30, 45, dan 60 menit. Proses kompaksi dilakukan dengan metode hot compaction single acting pada tekanan 196 bar dan temperatur 150 oC untuk menghasilkan green body dimensi diamater 30 mm dan tebal 7 mm. Green body kemudian disintering pada temperatur 150 oC selama 4 jam. Sampel selanjutnya dilakukan pengujian kekerasan dan keausan dan dibandingkan dengan nilai kekerasan dan keausan produk kampas rem komersial. Hasil penelitian menunjukkan bahwa komposisi campuran dengan waktu mixing 30 menit menghasilkan nilai kekerasan dan keausan yang mendekati produk kampas rem komersial yaitu sebesar 41,296 HVN dan 8,279 x 10-12 m3/m. Kata Kunci : soda lime glass, piston bekas, kampas rem non asbestos, mixing, kekerasan, keausan
Analisis Penggunaan Cathodic Protection dengan Metode Sacrificial Anode Sebagai Pengendalian Korosi Pipa Minyak 16 Inci PT. Chevron Pacific Indonesia Simp. Perawang-Minas Area Dedy Masnur; Eko Saputra; Putri Nawangsari
Proksima Vol 1 No 1 (2023): Jurnal ProKsima
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/proksima.1.1.13-17

Abstract

Cathodic protection is a thermodynamic corrosion control method using metal as the cathode. There are two methods of cathodic protection, namely Sacrificial Anode Cathodic Protection (SACP) and Impressed Current Cathodic Protection (ICPP). This study will analyze the use of Cathodic Protection with the Sacrificial Anode method as corrosion control on a 16 inch oil pipe at PT. Chevron Pacific Indonesia. Carbon steel pipe (API 5L Grade B) with cast magnesium anode material. Calculation of anode requirement for corrosion prevention will be compared with actual field data within 10 years. The calculation results show that the number of calculation parameters used affects the results of the anode requirement on an oil pipe with a length of 16 meters, a diameter of 16 inches, anode with a length of 0.648 m, net weight of anode 7.7 Kg, magnesium anode material with an anode output of 10.8 A/m2, anode density 1765 Kg/m3, wear and tear (volume) 2296 x 10-3 m3 A/y, and a life time of 10 years. Theoretical calculations get 6 anode rods while the actual data requires 8 anode rods.
Investigasi Kegagalan Poros Pompa Sentrifugal IP251-U153 pada Unit Recovery Boiler I PT. X Dedy Masnur; Putri Nawangsari; Dea Musyafiroh Akbar
Proksima Vol 1 No 1 (2023): Jurnal ProKsima
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/proksima.1.1.25-28

Abstract

PT. X is one of the industries engaged in the pulp and paper sector which uses centrifugal pumps to move compounds such as liquor, water, and so on. Failure occurred in the operation of the centrifugal pump, namely the fracture of the shaft component which was made of AISI329 stainless steel. This study aims to investigate the failure of the IP251-U153 centrifugal pump shaft and provide recommendations for actions to prevent failure. The stages of analysis carried out were macroscopic analysis of the fracture surface and testing of chemical composition using a Spectral Metal Analyzer. The results of the analysis show that the fracture pattern is brittle intergranular fracture and there is a difference in the percentage chemical composition of the shaft material with the composition of the standard shaft material in the elements Molybdenum (Mo), Manganese (Mn) and Copper (Cu). These elements affect the durability of the shaft. Checking the material composition when accepting a purchase and carrying out a check for alignment on the shaft installation is necessary to avoid failure.
Kekuatan Lentur dan Kekuatan Impak Komposit Matrik Epoxy Berpenguat Serat Sisal (Agave Sisalana) Menggunakan Metode Vacuum Bagging Asrian, Angga; Putri Nawangsari; Fatra, Warman; Masnur, Dedy
JURNAL SURYA TEKNIKA Vol. 12 No. 1 (2025): JURNAL SURYA TEKNIKA
Publisher : Fakultas Teknik UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jst.v12i1.9083

Abstract

Agave Sisalana is widely grown in the Bukit Bulek area, West Sumatra Province. The Sisal leaf fiber is traditionally utilized by the Bukit Bulek community as a rope material. This indicates it has a great potential to be developed as a composite reinforcement material. This research aims to characterize the flexural and impact strength of Sisal leaf fiber as reinforcement in epoxy matrix composites by varying the fiber volume fractions, 30%, 35%, 40%, and 45% with a 0°/90° fiber orientation laminate. The 20 cm long of fibers and treated with 5% NaOH alkaline solution for 4 hours were employed. The composites were fabricated using the vacuum bagging method. Flexural and impact tests were conducted based on ASTM D-790 and ASTM D-6110 standards, respectively. The results show that the flexural strength increases from 45,20 to 49,67 MPa (maximum) as the fiber volume fraction increases from 30% to 35% fiber. Meanwhile, the impact strength increases as fiber volume fractions from 30% to 45% and reaches a maximum impact strength of 24.60 kJ/m².
Co-Authors Anuar, Kaspul Asrian, Angga Dea Musyafiroh Akbar Dedy Masnur, Dedy Eko Saputra Harrianda Hudaya Warman Fatra, Warman