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All Journal Jurnal Planologi Sultan Agung Rekayasa Mesin Sinergi Rekayasa Sipil Jurnal Ilmiah Manajemen dan Bisnis (JIMB) ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Teknik Mesin Faktor Exacta The Spirit of Society Journal : International Journal of Society Development and Engagement BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Jurnal AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Astonjadro International Journal of Advanced Technology in Mechanical, Mechatronics and Material (IJATEC) International Journal of Innovation in Mechanical Engineering and Advanced Materials Jurnal Pengabdian Masyarakat Nasional Prosiding Seminar Nasional Ilmu Teknik
Agung Wahyudi Biantoro
Universitas Mercu Buana
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Analysis of Contract Change Order (CCO) Factors, which Affect the Fly Over Work (Case Study of The Cisauk Fly Over Development Project) Sukardi, Indra Mahendra; Biantoro, Agung Wahyudi
ASTONJADRO Vol. 14 No. 1 (2025): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v14i1.16392

Abstract

Every project can be guaranteed to experience change orders, which occur at the request of the contractor or owner. Change orders are governed by the terms of the contract. So the projects carried out are usually carried out with results that are not in accordance with what was planned. This research aims to find out what factors cause Contract Change Orders (CCO), which influence the Cisauk flyover work, Tangerang Regency. This research was conducted by distributing questionnaires and respondents to the Cisauk flyover construction project, Tangerang Regency. The research method uses quantitative analysis and questionnaire data processing using Statistic program with the analysis method of questionnaire validity test, questionnaire reliability test, correlation test, factor analysis test and Relative Important Index (RII). The results of the research obtained a ranking order for each factor and obtained the dominant factors that influence the occurrence of a Contract Change Order (CCO). There are 6 (six) research variables for problem formulation, namely contract documents (X1), planning and design (X2), owner involvement (X3), environmental or external conditions (X4), contractors (X5), and resources (X6), Factors that influence the occurrence of a Contract Change Order (CCO) for the Cisauk flyover work based on ranking order 1 to 5 are X.2.5 mismatch between design drawings and field conditions (RII: 0.814), X.2.1 Errors in planning drawings (RII : 0.745), The most dominant factor influencing the occurrence of a Contract Change Order (CCO) on the Cisauk fly over project is the indicator that comes from variable X2, namely planning and design.
Evaluation of FIR bandpass filter and Welch method implementation for centrifugal pump fault detection Romahadi, Dedik; Feleke, Aberham Genetu; Adinarto, Tri Wahyu; Feriyanto, Dafit; Biantoro, Agung Wahyudi; Rachmanu, Fatkur
SINERGI Vol 29, No 2 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2025.2.007

Abstract

The motivation for this research is the high vibration observed during the operation of the centrifugal cooling water pump. Our study aims to assess the pump's state and check the vibrations to ensure the factors underlying the fault of the centrifugal pump in the alkaline chlorine factory. While previous studies have primarily used spectral amplitude results from the Fast Fourier Transform to analyze engine vibrations, we propose a different approach in this study. We employ the Finite Impulse Response (FIR) Bandpass Filter and the Welch Method, a practical analytic approach. The ISO 10816-3 standard is a benchmark of the RMS value to determine the pump's condition. The FIR Bandpass Filter and Welch Method prove to be highly effective in describing and modifying the vibrational signals of the centrifugal pump. The approach is particularly beneficial as it is consistent across sample rate settings, reduces the vibration of amplitude low, produces a smoother spectrum with only the primary frequency component, and segments the vibration signal into the frequency band-aids to identify the primary vibration source. The diagnostic results reveal increased vibrations at 1x, 2x, and ball pass frequency (BPF), indicating impeller damage and disappearance. Post-repair, the vibration value experiences a significant drop, as per the fault analysis results, further confirming the high effectiveness of our approach. These findings have practical implications for the maintenance and fault diagnosis of centrifugal pumps, providing a reliable and effective method for identifying and addressing issues. 
Application of Ultrasonic and Coating Material Thickness Testing on Post-Fire Steel Construction Citra, Zel; Antonius; Biantoro, Agung Wahyudi
Rekayasa Sipil Vol. 19 No. 2 (2025): Rekayasa Sipil Vol. 19 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2025.019.02.12

Abstract

Steel has advantages over other construction materials, including flexibility and processing time. Steel has better elasticity and relatively faster processing time compared to reinforced concrete. However, the weakness is that steel is also very susceptible to temperature changes. If a steel material experiences an increase in temperature, for example, if it is directly exposed to fire, its yield and tensile strength will decrease drastically. This can cause the function of the steel material as a structural element to change. In early 2023, a fire occurred in a steel construction tower used for animal feed processing, PT. XYZ in the Lampung area. As a result of the fire, there is a concern about the risk of structural failure, which could cause worker fatalities in the building. So, it is necessary to test the thickness of steel tower structural elements such as columns, beams, and bracing using the Non-Destructive Test method with an Ultrasonic Material Gauge and Material Coating Thickness. The test samples were taken in as many as 20 samples with the test structure including column elements, beam elements, and bracing at each level or elevation of the fire-affected floor. Test sample include WF200X100X5,5x8, WF250X125X6X9, WF300X150X6,5X9, WF400X200X8X13, HB400X400X13X21 and Pipe Ø6”. The results of the post-fire steel structure measurement, the thickness of columns, beams, and bracing from 20 samples, showed that 95% still met the thickness tolerance of 0.7 mm- 1.2 mm based on the SNI 07-0329-2005. The thickness of the post-fire coating, 95% steel structural coating, did not meet the standards below 240mm. Only 5% met the minimum coating thickness standards, such as pipe bracing Ø6" with a coating thickness of 397 microns. And for repair, repainting is recommended. Repainting must be done to prevent corrosion and restore the structure's safety.
ANALISIS BEBAN PENDINGINAN RUANG GARDU TRAKSI STASIUN LEBAK BULUS BERDASARKAN STANDAR SNI 6389-2011 DAN ASHRAE GUNAWAN, JEFRI; BIANTORO, AGUNG WAHYUDI
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol. 7 No. 2 (2021)
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/ame.v7i2.4936

Abstract

Gardu traksi Stasiun Lebak Bulus dijaga suhu ruangan dan kebersihannya untuk mempertahankan umur pakai peralatannya. Baterai untuk suplai daya sistem 110 VDC idealnya beroperasi pada suhu 20℃ untuk umur pakai 20 tahun karena setiap kenaikan 8℃ umurnya menjadi separuhnya. Suhu ruangan pada tahun 2019-2020 berkisar antara 29.3- 34.6℃ sehingga umur operasinya hanya 38% dari desainnya. Selain itu, terjadi beberapa kali kerusakan pada rectifier, pengisi daya baterai dan RTU (remote terminal unit) sepanjang 2019-2020 yang disebabkan oleh suhu ruangan yang tidak ideal dan berdebu. Untuk menjaga umur peralatan, diperlukan mesin pendingin udara dengan kapasitas sesuai dengan beban pendingin yang diperlukan untuk suhu ruangan 20℃. Sehingga perlu dilakukan analisis beban pendingin meliputi perhitungan beban pendingin dari luar melewati selubung bangunan dan perhitungan beban pendingin total. Metode analisis deskriptif digunakan dengan menghitung nilai OTTV (Overall Thermal Transfer Value) dan beban pendingin berdasarkan Standar SNI 6389-2011 dan ASHRAE. Peralatan yang digunakan antara lain portable thermo-hygrometer dan digital laser distance. Hasilnya, nilai OTTV dari ruang gardu traksi sebesar 8,7 W/m2, sesuai dengan standar SNI 6389-2011 OTTV yaitu  35 W/m2. Kemudian total beban pendingin sebesar 269.318,22 BTU/h, sehingga dibutuhkan mesin pendingin udara dengan kapasitas 22,44 TR = 29,92 PK untuk mendinginkan ruang gardu traksi pada suhu 20℃.
Kondisi Struktur Tower Baja Terdampak Kebakaran Melalui Inspeksi Secara Visual Zel Citra; Antonius Antonius; Biantoro, Agung Wahyudi
Prosiding Seminar Nasional Ilmu Teknik Vol. 1 No. 2 (2024): Desember : Prosiding Seminar Nasional Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/prosemnasproit.v1i2.40

Abstract

Building fires can significantly degrade the strength and integrity of steel structures, so post-incident evaluation is crucial to ensure building safety and feasibility. This study aims to evaluate the condition of the steel tower structure after the fire through a visual inspection method. A total of 35 structural elements were examined, including columns, beams, and bracing, to identify damage caused by heat exposure. The inspection results showed that 6 elements (17%) were in the category of Acceptable, 8 elements (23%) Needs Attention, 5 elements (14%) Not Acceptable, and 1 element (3%) Not Applicable because they had been removed. Steel columns generally remain upright without deformation, but suffer damage to the protective layer (coating). In contrast, most blocks lose their protective layers, are directly exposed to fire, show early signs of corrosion, and some suffer severe damage such as flange tears and cuts. These findings confirm the importance of systematic documentation and classification of element conditions as the basis for technical decision-making for structural improvement. Visual inspection proved effective as an initial step in the evaluation process, providing a relevant initial picture of the extent of damage and the need for intervention. This study recommends follow-up in the form of advanced structural analysis and material testing to ensure the feasibility of reusing the affected steel elements.
ANALYSIS OF THE EFFECT OF PENSTOCK DIAMETER ON HYDROCOIL TURBINE PERFORMANCE IN SUKAJAYA VILLAGE, LEMBANG DISTRICT, WEST JAVA alif, irfan alif; Biantoro, Agung Wahyudi
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 14, No 3 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v14i3.18244

Abstract

The turbine used in this study is a reaction turbine called hydrocoil turbine. In hydrocoil turbines require penstock pipe components to support turbine performance, the size of the penstock pipe has its own potential. Errors in determining the diameter of the penstock can affect the performance of hydrocoil turbines. The purpose of this study is to perform penstock comparison using ansys with a diameter of 6 inches, 8 inches and 10 inches and determine the diameter of the penstock to get the best hydrocoil turbine performance. This study was conducted using Computational fluid dynamics (CFD) method which includes torque, turbine power, and efficiency, the results of the analysis of the calculation of the highest torque value obtained by the 10-inch penstock at 150 rpm rotation of 398.51 Nm, and the torque value obtained by the 8-inch penstock at 150 rpm rotation of 282.47 Nm, the lowest torque value obtained by the 6-inch penstock at 950 rpm rotation of 51,061 Nm. Then the highest power value obtained by the 10-inch penstock at 950 rpm rotation of 27279.53 Watts and the power obtained by the 8-inch penstock at 950 rpm rotation of 21861.41 Watts, the lowest power obtained by the 6-inch penstock at 950 rpm rotation of 5077.16 Watts. So that the highest efficiency value obtained by 10-inch penstock at 950 rpm rotation of 90.58% and the efficiency value obtained by 8-inch penstock at 950 rpm rotation of 72.59 %, the lowest efficiency value obtained by 6-inch penstock at 950 rpm rotation of 16.85 %. It can be concluded from the values already obtained, penstock with a diameter of 10 inches has the highest value to get the best turbine performance, followed by penstock diameter of 8 inches has the highest value Number 2 and penstock with a size of 6 inches has the lowest value, proven by the speed varied according to the diameter of the penstock and constant discharge indicates that the larger the diameter of the penstock will produce the best turbine performance.
ANALYSIS OF FIRE FIGHTING PUMP PERFORMANCE USING SNI 03-6570-2001 STANDARD ON SELF-CONTAINED HYDRANTS Auf, Abdurrahman; Biantoro, Agung Wahyudi; Romahadi, Dedik; Chaeroni, Amat
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 5, No 2 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v5i2.20898

Abstract

Self-controlled hydrants are fire protection systems located in residential areas that function for early fire extinguishing. In a fire protection system, the pump plays an important role in supplying water from the reservoir to the end point of the installation. Fire pumps must always be in optimum condition and accordance with applicable standards. This study aims to analyze pump performance at current conditions in self-contained hydrants in the Palmerah District and then compare it with the performance that pumps should have in ideal conditions according to SNI 03-6570-2001 standards. The method used is a quantitative descriptive analysis method by comparing the current condition of the pump with applicable standards and conducting a direct survey of the location of the installed fire pump. The measuring instruments used in the study were a pressure gauge, control box, and pitot gauge. The results obtained through testing and calculating pump performance The pump installed on the self-contained hydrant in actual conditions with a total head of 86.62 m produces a flowrate of 0.0189 m3/s at 2800 RPM and can flow a maximum flowrate of 0.0284 m3/s with a head of 66.94 m while in ideal conditions with approximately the same speed and total pump head of 88.83 m, The pump produces a flow rate of 0.0473 m3/s and can produce a maximum flowrate of 0.0710 m3/s with a head of 71.81 m and when shut-off (Q = 0) at actual and ideal conditions produces a same total pump head 94.10 m. However, the pump in actual conditions can flow a minimum flowrate required of 0.040 m3/s with a pressure required of 350 kPa at 3000 RPM with a total pump head of 108.52 m. Thus, the pump must operate heavier due to the higher total head to deliver the required minimum flow rate and pressure.
Co-Authors Abdul Hamid Abdul Hamid Acep Hidayat Adinarto, Tri Wahyu Aditya Putra, Aditya Adnan, Mohd. Shalahuddin Bin Alief Avicenna Luthfie, Alief Avicenna alif, irfan alif Antonius Antonius Antonius Arif Kusnan Hidayanto Auf, Abdurrahman Bambang Darmono Basuki Dwi Effendy bin Muhd Noor, Nik Hisyamudin Budi Susetyo Cahyana, Babay J Chaeroni, Amat Citra, Zel Dadang S. Permana Dafit Feriyanto Effendy, Basuki Dwi Fadilla, Muhammad Riza Fahmi Hidayat Feleke, Aberham Genetu Gunawan, Jefri Hadi Pranoto Heru Maryanto Hidayanto, Arif Kusnan Indriany, Syilvia Iskendar Iskendar Jawu, Patricia Kanicia Kumbarasari, Shanti Maryanto, Heru Mawardi Amin Muhammad Isradi Nabila Afdal Nana Subarna, Nana Permana, D.S. Purbatin, Hari Rachmanu, Fatkur Reni Karno Kinasih Rini Anggraini Romahadi, Dedik Subekti Subekti Subekti Subekti Subekti Subekti Sukardi, Indra Mahendra Supiyat, Agus Vidayanti, Desiana