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All Journal TEKNIK Rotasi GEMA TEKNOLOGI Abdimas Rekayasa Mesin J-Dinamika: Jurnal Pengabdian Kepada Masyarakat Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Mechanical Engineering for Society and Industry Jurnal Pengabdian Vokasi Journal of Vocational Studies on Applied Research

Seno Darmanto

Program Diploma III Teknik Mesin Fakultas Teknik Universitas Diponegoro

Author-ID : 249943

Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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ANALISIS PERFORMANCE COOLING TOWER TIPE INDUCED DRAFT COUNTER FLOW PLTP KAMOJANG UNIT 5 Abdurohman, Hasan; Mrihardjono, Juli; Darmanto, Seno
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 8, No 2 (2022): Oktober
Publisher : universitas teuku umar

Cooling tower is a heat exchanger used to cool water from the condenser. The process is carried out by contacting water with air directly and discharged into the atmosphere using air fluid that is flowed naturally or flowed by a fan. Cooling tower type used in PLTP Kamojang Unit 5 is Induced draft Counter Flow. This equipment more important in increasing turbine efficiency, therefore special treatment is needed by knowing and observing the performance of the Cooling tower so that it can be analyzed in actual conditions and make decision steps in carrying out further repairs and maintenance, this is the basis of research that will be carried out by looking for value and the Cooling tower performance trendline. The calculation method uses the standard ASME PTC 23-2003 and CTI ATC-105 where the results are the calculation baseline and the historical trendline of Cooling tower performance based on the parameters of the 3-cell Cooling tower operating conditions. The parameters tested are by taking 5 valid data on PLTP KMJ Unit 5, then the Tower Capability performance values are obtained as follows, namely in the initial commissioning conditions the performance value is 92,1%, Q1 2021 is 78,8%, Q3 2021 is 74, 3%, Q4 2021 is 84,7%, and Q1 2022 is 83,8%. There was a decrease in Q3 2021. Then there was an increase in the trend in Q4 2021 due to previous overhaul activities on the Cooling tower. Keywords: Cooling tower, trendline, overhaul, tower capability

Reliability Analysis of Diesel Engine at LNG Plant using Counting Process Darmanto, Seno; Atmanto, Ireng Sigit; Permana, Bagus Hendra
Journal of Vocational Studies on Applied Research Volume 1, Issue 2, Year 2019 (October 2019)
Publisher : Vocational College of Universitas Diponegoro

The purpose of this research is to analyze the reliability of diesel engine as driver for fire water pump. To determine the reliability level of the diesel engine, this research will apply counting process so that the rate of failure of the diesel engine can be known. The data used as basis for calculation is failure data gained from maintenance work order databases from 2012 to 2017. The data obtained will be processed using counting process method to produce mathematical modeling to predict the amount of failure to diesel engines in the future. From 4 diesel engines, only 3 parametric failure rate (l) that could be generated, for 33-GE-5A, for 33-GE-5B, and for 33-GE-5C, since 33-GE-5D was severely damaged in September 2015. The mathematical modeling will be verified using the Pearson's Chi-squared Test method to ensure the validity of the mathematical model can be guaranteed. The result of the goodness of fit test shows that only parametric failure rate (l) for 33-GE-5B and 33-GE-5C that could be accepted. The outcome mathematical model will be used to predict future behavior and failure of the unit so effective and efficient maintenance strategy for 33-GE-5B and 33-GE-5C could be applied

Failure Analysis at Stem Valve Fire Hydrant in LNG Plant Mrihardjono, Juli; Pohan, Herman Abidin; Darmanto, Seno
Journal of Vocational Studies on Applied Research Volume 1, Issue 2, Year 2019 (October 2019)
Publisher : Vocational College of Universitas Diponegoro

Hydrant is one of fire extinguisher fix system that use pressure water and flowed through the pipes and fire hose. There are more 250 Hydrant in this LNG Plant and based on finding at the field, many stem valve of outlet hydrant in fracture condition, therefore the author wants to analyze about the problem from this material, this reserch aims to find out root cause dan conduct failure analysis, method of reserch that conducted is visual check to predict possible cause from failure of stem valve fire hydrant and then conducted fractographic analysis to find out what type of fracture that happen to this material and Tensile Strenght Test to Find out the the actual strenght of the material

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 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 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.

Failure Analysis Of Water Pump Shaft Ariwibowo, Didik; Putra, Sulthonul; Darmanto, Seno; Mrihardjono, Juli; Mangestiyono, Wiji
Journal of Vocational Studies on Applied Research 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.

Remaining useful life prognosis of low-speed slew bearing using random vector functional link Caesarendra, Wahyu; Rahardja, Dimas Revindra; Abdillah, Muhammad; Darmanto, Seno; Handayani, Sri Utami; Lestari, Wahyu Dwi; Krolczyk, Grzegorz
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12965

Bearings have a very important role in an industry. However, the cost of maintenance and replacement of bearings are very expensive especially for slew-bearing which operated in a very low speed. If the low-speed slew bearing shutdown suddenly, it will also cause a financial issue to the certain industries with rely on the rotating machines because the entire machine will be shut down and the production will be stop Therefore, monitoring of the low-speed slew bearing condition at all times is necessary to predict the bearing failure. There has been advance monitoring devices and systems related to the vibration condition monitoring for bearing and rotating machines, however, in certain cases those monitoring devices and systems are not sufficient. Machine learning is offered to complement and contribute in this case which aims to determine the prediction and Remaining Useful Life (RUL) of the bearing before the bearing experiences more damage. In this paper, the Random Vector Functional Link (RVFL) is used to predict RUL using low speed slew bearing data from University of Wollongong, Australia. The main evaluation matrix such as RMSE is used as an evaluation of the performance of the model used. According to the prediction results, the best modeling results are obtained using a data ratio of 80:20 and a SELU activation function that produces the best average RMSE value. The prediction value of Remaining Useful Life (RUL) of the bearing is 94.24%.

Co-Authors Abdurohman, Hasan Adi Nugroho Al Ayubbi, Irfan Bambang Setyoko Budiharja, Yuniar Anis Daryono, Mohammad Didik Ariwibowo Eko Julianto Sasono Fathurrohman , Nur Kholis Ferdiyanto, Riky Firdaus, Ghifa Haqni, Firdaus Kurniawan Hardyanto, Arief Prakoso Hartono Hartono Ireng Sigit Atmanto Juli Mrihardjono Jusman Jusman Krolczyk, Grzegorz Kusni, Muhammad Margaretha Tuti Susanti Muhammad Abdillah Muhammad Akhsin Muflikhun Mukhamad, Alaya Fadlu Hadi Murni Murni Nina Mardiana (F01108057) Nugroho, Alvin Dio Nugroho, Galih Satrio Permana, Bagus Hendra Pohan, Herman Abidin Putra, Sulthonul Rahardja, Dimas Revindra Ridwan, Mohd. Saputra , Imam Saputra, Galih Satria Hendri Sarwoko Sarwoko Sri Utami Handayani Sriyana Sriyana Sunarso Sugeng Susastro, Susastro Sutrisno, Sutrisno Triyatno Triyatno Wahyu Caesarendra Wahyu Dwi Lestari Wibisono, Anggit Wiji Mangestiyono Windu Sediono Yoga Yuniadi Yuniarto Yuniarto, Yuniarto Yusuf Umardani Yusuf, Bakharuddin

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