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All Journal Rotasi GEMA TEKNOLOGI METANA Jurnal Rekayasa Mesin Indonesian Food Science and TechnologyJournal Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Jurnal Pengabdian Vokasi Journal of Vocational Studies on Applied Research Jurnal Inovasi dan Teknologi Pendidikan

Didik Ariwibowo

PSD III Teknik Mesin

Author-ID : 233221

Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Computer Science & IT Decision Sciences, Operations Research & Management Education Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Other

Published : 17 Documents Claim Missing Document

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Design of Blowdown Line LNG Filling Station ISO Tank Ariwibowo, Didik; Wahyuddin, Wahyuddin; Murni, Murni; Sutrisno, Sutrisno; Handayani, Sri Utami
Journal of Vocational Studies on Applied Research 2019: JVSAR, Volume 1 Issue 2 Year 2019 (October 2019)
Publisher : Vocational College of Universitas Diponegoro

LNG (Liquid Natural Gas) is a liquefied natural gas, with composition of 87% - 96% methane, 1,8-5,1% ethan, 0,1-5,1% propane and other compounds. The composition of natural gas (LNG formation) varies depending on the source and the process of its formation. Methane gas in LNG has odorless, non-corrosive and non-toxic properties (Air Products, 1999). LNG is basically an alternative method to deliver gas from producer to consumer. When cooled to -162˚C at 1 atm pressure, natural gas becomes liquid and its volume decreases up to 600 times (Handbook of Liquefied Natural Gas, 2014). With such a large volume reduction, liquefied natural gas (LNG) can be transported through the Tanker Ship and the ISO Tank Truck. PT Badak NGL has 3 (Three) T.U.K.S (Terminal For Ownership) As Tanker Ship Facilities and 1 (One) LNG Filling Station as a means of filling LNG to ISO Tank. Development of business process of PT. Badak NGL leads to an increase in LNG filling Station capacity. Along with the plan to increase the filling station capacity, the problem of BOG (Blow of Gas) wastage along with some LNG to ground flare becomes a serious concern. When the number of fillling stations is only 1 (one) station, the BOG wasted condition is not significant. However, with plans to increase the number of filling stations, BOG wasted need to be considered to be fully utilized. Therefore, there is a thought to utilize BOG to become more economic value, through the design of blowdown line on LNG ISO Tank filling station. In the Design of this line Blowdown, Using Pipe Ø2 "(PIPE BE 40S SS A312-TP305 SMLS) interconnecting with Pipe Ø6" (PIPE BE 40S SS A312-TP305 SMLS) BOG Header of new Filling Station under construction (Beginning January 2018 ).

Reliability Analysis of Fire Water Line Sutrisno, Sutrisno; Ariwibowo, Didik; Darmanto, Seno; Mangestiyono, Wiji; Saputra, Galih Satria Hendri
Journal of Vocational Studies on Applied Research 2020: JVSAR, Volume 2 Issue 2 Year 2020 (October 2020)
Publisher : Vocational College of Universitas Diponegoro

The purpose of this research is to analyze the reliability of firewater as a water distribution for emergency conditions. To determine the remaining useful life (RUL) of the firewater line, this research will apply the counting process so that the rate of remaining useful life (RUL) of the firewater line can be known. The data used as the basis for calculation is failure data gained from technical division databases from 2018. The data obtained will be processed using visual inspection and ultrasonic thickness test methods to produce the remaining useful life of the firewater line. From 5 example fire water lines, only 3 needed to replace of firewater line cause less than 10 years. RUL to 9 years at 10” and 12” Train C/D, 2.45 year at 14” Train C/D, 8 years at 10” and 12” Utilities I. The mathematical modeling will be verified using visual thickness and ultrasonic Test method to ensure Remaining useful life of firewater line at Badak LNG. Visual inspection refer to API 571 and ultrasonic test refer to API 570 and ASME B31.3

Modification of Drain Hayward Strainer Pipe Header Pipes to Improve Efforts of Cooling Water Pump Train EF Badak LNG Bontang Murni, Murni; Ferdiyanto, Riky; Darmanto, Seno; Ariwibowo, Didik
Journal of Vocational Studies on Applied Research 2019: JVSAR, Volume 1 Issue 2 Year 2019 (October 2019)
Publisher : Vocational College of Universitas Diponegoro

In Badak LNG the role of the cooling water pump is very important, and becomes the main support for transferring sea water where the water is used in the cooling process of industrial machinery or as emergency safety for firefighters. Water pump cooling has a hayward strainer that serves to filter water with a smaller filter so that the cooling water that is sent is completely free of dirty water. The purpose of this final project is to find out the main causes of the performance degradation of the EF cooling water pump due to the barrier to the hayward strainer which results in lower pressure on the cooling water. The methodology applied was based on field observations and conducted a solidwork simulation test. Field observations show that when more than one hayward strainer is in backwash, the effectiveness of backwash release decreases because the main disposal of the hayward strainer becomes one. The solidwork simulation found that the pressure on the Hayward train E strainer was high enough to create back pressure and limit the flow of the Hayward strainer outlet. By performing actual simulations by only running only one exhaust system at Hayward train E trainer has improved performance on the hayward strainer system. The performance analysis of the cooling water pump was carried out to determine the cause of the pump pressure drop on the hayward strainer and it was found that the main cause of performance was due to back pressure disposal, the pressure was increasing at each outlet of the Hayward strainer which had more distance to the outlet drain. Taking into account the problem of back pressure, separating the train E and F cooling water pump lines is a good choice. After simulating solid work, the separation of the E train line and the F colling water train shows an increase in the performance of the cooling water pump system because the Hayward strainer runs well so that the pump pressure is maintained for the industrial engine cooling needs.

Techno Economic Modelling of Dried Black Potato (Plectranthus rotundifolius) Ardi, Pradipta Risma Rukmana; Milzam, Muhammad; Ariwibowo, Didik; Paramita, Vita
Journal of Vocational Studies on Applied Research 2019: JVSAR, Volume 1 Issue 1 Year 2019 (April 2019)
Publisher : Vocational College of Universitas Diponegoro

The techno economic modeling of dried black potato (Plectranthus rotundifolius) was studied by employing electrical cabinet oven. The parameters investigated were including parameter obtained from analysis of capital budgeting, breakeven point and financial ratio of rentability. The obtained payback period was 2 years 11 months by investing 53.000.000 rupiah for machinery and 10.000.000 rupiah for start-up cost as initial capital. By assuming 10 years of dried black potato production, the value of net present value was equal to 1.207.982.611 rupiah. The value of gross profit margin and net profit margin were 0.97 and 0.87, respectively. Regarding to the positive value of net present value, the lower payback period value, and the high value of internal rate of return (74.47%) and also the profitability index (20.17), the modeling of techno economic was positively recommending the commercial application of dried black potato by using electrical cabinet oven.

Failure Analysis Of Water Pump Shaft Ariwibowo, Didik; Putra, Sulthonul; Darmanto, Seno; Mrihardjono, Juli; Mangestiyono, Wiji
Journal of Vocational Studies on Applied Research 2019: JVSAR, Volume 1 Issue 2 Year 2019 (October 2019)
Publisher : Vocational College of Universitas Diponegoro

A water pump shaft for utility water raw material was failed. The shaft was broken into two parts. While in dismantling, the sand was found in chamber between bearing and shaft. There was also a bolt in the impeller. According to reports, the pump has been repaired and since there was no replacement shaft but the shaft was reused in reverse position. There was no inspection of the shaft when it was disconnected by operational reasons. The failure analysis of the broken-shaft was performed to investigate the cause of the failure. Two inspection and analysis were perfomed those are visual inspection and material identification and analysis. When material analysis of the shaft was carried out there was difference between examination and data specification of the shaft.The material identification indicate that the material was AISI SS 304 whereas specification data states SS 316. Both materials have similar tensile stress, so the difference was not the contributor of the failure. The present of foreign material was consider as the cause of the failure. The foreign material caused to stucked on rotation of shaft and increasing in tensile of the shaft over its ultimate strength.

ANALISIS PERBANDINGAN PROTOKOL JARINGAN DARI SEGI KINERJA DAN KEAMANANNYA PADA FKIP UNTIRTA Ariwibowo, Didik; Turangga, Rollis Kurnia; Rimanada, Talitha Naurah; Oktiana, Nur Rohima; Wibowo, Adam Falrain; Fahreza, Dzikri; Galih, Muhammad Raihan; Nurfirdaus, Anas; Fauzi, Muhamad Luthfi
Jurnal Inovasi dan Teknologi Pendidikan Vol. 4 No. 1 (2025): Jurnal Inovasi dan Teknologi Pendidikan
Publisher : LPPM Universitas Bina Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46306/jurinotep.v4i1.160

Research and Evaluation of security system changes from SSO to open systems are important to protect data. Because the increasing cyber threats make this research crucial. Infrastructure Needs to Improve network capacity for many users are a priority. Explore the impact of system changes on information protection. Understanding bottlenecks can help design better infrastructure. The results of the study can be used to improve network policies. Analyze system transitions in specific environments. and Collect user and IT staff perspectives. Use historical data to review bottleneck incidents and data leaks. Open systems reduce administrative burden but increase the risk of unauthorized access. Bottleneck Bottleneck incidents highlight the need for infrastructure upgrades. SSO security is more secure but more expensive and complex. Recommendations Routine maintenance and capacity upgrades are needed for network security and efficiency.

Optimization of Coffee Bean Extraction Using Subcritical Water: A Response Surface Methodology Approach for Maximizing Caffeine and Antioxidant Yield Sutrisno, Sutrisno; Yulianto, Mohamad Endy; Ariwibowo, Didik; Paramita, Vita; Utari, Febiani Dwi; Azhara, Belinda; Monawisya, Abitha; Rizki, Muhammad
Indonesian Food Science and Technology Journal Vol. 9 No. 1 (2025): Volume 9 Number 1, December 2025 |IFSTJ|
Publisher : Department of Technology of Agricultural product (THP) Jambi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/ifstj.v9i1.43017

This study explores the optimization of Subcritical Water Extraction (SWE) for maximizing caffeine and antioxidant yields from coffee beans using Response Surface Methodology (RSM). A Central Composite Design (CCD) was employed to evaluate the interaction effects of three key variables: temperature, solvent volume, and extraction time. As an eco-friendly alternative to conventional extraction methods, SWE was optimized based on these parameters. Statistical analysis confirmed their significant influence on bioactive compound recovery, with optimal conditions—162.440 °C, 28.409 mL of solvent, and 27.389 minutes—yielding 0.395 mg/mL caffeine and 27.039 μg/mL antioxidants, achieving a composite desirability value of 0.873. SEM analysis revealed significant structural degradation in the SWE-treated coffee extract, enhancing the release of caffeine and antioxidants by increasing porosity and cell wall disruption. This improved extraction efficiency, combined with SWE’s solvent-free nature and scalability, reinforces its role as an efficient method for extracting bioactive compounds from coffee, supporting its adoption as a green technology in sustainable food processing.

Co-Authors Al Ayubbi, Irfan Alaya Fadllu Hadi Mukhammad Ardi, Pradipta Risma Rukmana Azazi, Khasnan Azhara, Belinda Budi Prasetyo Dista Yoel Tadeus Eflita Yohana Fahmi Arifan Fahreza, Dzikri Fauzi, Muhamad Luthfi Ferdiyanto, Riky Galih, Muhammad Raihan Juli Mrihardjono Milzam, Muhammad Mohamad Endy Y Yulianto Monawisya, Abitha Muhammad Rizki Murni Murni Nurfirdaus, Anas Oktiana, Nur Rohima Putra, Sulthonul Rimanada, Talitha Naurah Robbaanii, Moh. Ammar Saputra, Galih Satria Hendri Sembiring, Rinawati Senen Senen Seno Darmanto Sri Utami Handayani Sutrisno, Sutrisno Syarifucin, Yanuar Taufik Turangga, Rollis Kurnia Utari, Febiani Dwi Vita Paramita Vita Paramitha Wahyuddin Wahyuddin Wibowo, Adam Falrain Wijayanto, Bagus Wiji Mangestiyono Yuliyanti yuliyanti

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