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All Journal Jurnal Teknik ITS IJOCE (International Journal of Offshore and Coastal Engineering) International Journal of Marine Engineering Innovation and Research
Yoyok Setyo Hadiwidodo
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Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Analisa Pemasangan Loop Ekspansi Akibat Terjadinya Upheaval Buckling pada Onshore Pipeline Hariono Hariono; Handayanu Handayanu; Yoyok Setyo Hadiwidodo
Jurnal Teknik ITS Vol 3, No 2 (2014)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (629.332 KB) | DOI: 10.12962/j23373539.v3i2.7102

Abstract

Pada pipa yang dipendam didalam tanah sering terjadi kegagalan deformasi. Kegagalan deformasi global yang menyebabkan pipa menekuk vertikal ke atas yang disebut sebagai upheaval buckling. Lengkungan awal pada pipa penyalur yang terpasang bisa terjadi akibat kombinasi dari kenaikan temperatur saat operasional dan gaya friksi tanah akan menghasilkan gaya tekan aksial efektif pada pipa. Salah satu cara yang akan dibahas pada penelitian ini jika terjadi upheaval buckling adalah pemasangan loop ekspansi pada daerah yang mengalami upheaval buckling. Loop ekspansi akan divariasikan dengan 2 tipe yaitu tipe loop horizontal dan tipe loop vertical. Pada penelitian ini terlebih dahulu pipa dimodelkan dengan panjang pipa tertentu kemudian ujung-ujungnya diberi tumpuan sehingga didapatkan besar tegangan longitudinal sebesar 41366,563 Psi. Tegangan tersebut melebihi tegangan ijin sehingga pipa mengalami ekspansi termal atau elongasi yang membentuk lengkungan keatas dengan tinggi 0.259 meter. Maka dilakukan pemodelan loop ekspansi untuk meredam elongasi tersebut dengan panjang loop 5.3 meter. Kedua loop tersebut mampu meredam tegangan aksial menjadi 3662 Psi untuk tipe loop horizontal dan 3670 Psi untuk tipe loop vertikal. Dari kedua tipe loop tersebut kemudian juga dilakukan perbandingan besar tegangan yang terjadi pada bagian elbow. Maka didapatkan bahwa tipe loop horizontal mengalami tegangan relatif lebih kecil dari pada tipe loop vertikal sehingga sebagai bahan rekomendasi maka pemasangan loop horizontal lebih diutamakan.
Analitical Study of Vertical and Lateral Buckling on Pipeline Using Hobbs Method Yoyok Setyo Hadiwidodo; Muhammad Makki Romadhoni; Herman Pratikno
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 2 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (894.413 KB) | DOI: 10.12962/j2580-0914.v1i2.7058

Abstract

During its operation, the pipeline will receive loads of internal pressure and thermal loads of fluid flowed until the pipes have both vertical and lateral buckling. Numerical analysis of vertical and lateral buckling Hobbs this method on a high friction coefficient and the coefficient of friction (0.3 ≤ φ ≤ 0.7) as well as the length of buckling as many as 20 variants were then performed comparisons, as well as axial tension comparison with DnV RP L110. So we get the relationship of temperature increase with the length and amplitude buckling. The data which is used is the gas pipeline Labuhan Maringgai-Muara Bekasi PT. Perusahaan Gas Negara (Persero) Tbk., Including the outer diameter of the pipe = 0.8128 m, plate thickness = 0.015875 m, thermal linear expansion coefficient = 11 x 10-6 m / oC, etc. So the higher coefficient of friction, temperature rise of 13.4%, 13.4% reduced buckling length, and axial tension increased to 12.95%. For the comparisons, the coefficient of friction does not affect the length of buckling on the vertical buckling. Comparison with DnV RP F110, increased coefficient of friction will increase the voltage axial (Seff) of 0.00024% and up 13.4% axial stress (P0) Hobbs.
The Analysis of Coastal Society Vulnerabilities Against the Spread of Covid-19 in Surabaya Using the Analytical Hierarchy Process (AHP) Hasan Ikhwani; Dendy Satrio; Widdi Umari; Sujantoko Sujantoko; Yoyok Setyo Hadiwidodo; Muhammad Rizky Syarifudin
International Journal of Marine Engineering Innovation and Research Vol 7, No 4 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v7i4.14675

Abstract

Coronavirus belongs to the ARI (Acute Respiratory Infection) disease, which has a high level of mortality risk. In 2019, this virus was transformed into Covid-19 with a rapid spread and a more massive impact. This disease has become a worldwide pandemic. Indonesia is a developing country and is included as one of the most densely populated countries affected by the Covid-19 pandemic, which has great potential to fail in overcoming this problem. Approximately 60% of Indonesia's population lives in coastal areas with low levels of welfare in almost all sectors of life such as social, economic, education, and health. This study aims to analyze the level of community vulnerability in the coastal area of Surabaya City by using the Analytical Hierarchy Process method. From the data taken by the survey, the results of the exposure of the Bulak Banteng Village area of Surabaya in the health, socio-cultural, economic, and general fields are 0.0469, 0.0871, 0.1809, and 0.3551, respectively. So the overall vulnerability is 0.67, which is included in the medium vulnerability criteria.
Burst Pressure Assessment of Corroded Steel Pipeline Using DNV-RP-F101 and Finite Element Method with Circumferential Defect Interaction Study Yoyok Setyo Hadiwidodo; Asta Razqi Damarjati; Herman Pratikno
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v10i1.9918

Abstract

Metal loss corrosion is one of the primary degradation mechanisms in steel pipelines in the oil and gas industry. Wall thickness reduction due to corrosion increases hoop stress and reduces the maximum pressure capacity of the pipeline, potentially leading to bursting failure. This study aims to analyze the bursting pressure of corroded steel pipelines using two approaches: the analytical method based on DNV-RP-F101 and the numerical method using the Finite Element Method (FEM) through ANSYS software. The parameters investigated include the defect depth ratio (d/t) and the circumferential spacing between defects. A three-dimensional numerical model was developed considering elastic-plastic material behavior. The results indicate that an increase in defect depth ratio has a dominant effect in reducing bursting pressure, while closer defect spacing intensifies stress interaction and accelerates local plastification. A comparison between DNV-RP-F101 and FEM shows deviations within acceptable engineering tolerance; however, FEM predicts lower failure pressure as it captures stress concentration and plastic distribution in greater detail.
Analysis of Potential Skidway Loadout Failures Based on the Structural Strength and Foundation Settlement on the Fabrication Site in the Pre-Fabrication Phase. Agus Juwarno; Yoyok Setyo Hadiwidodo; Handayanu
International Journal of Offshore and Coastal Engineering Vol. 9 No. 2 (2025)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j225800914.v9i2.8931

Abstract

The abstract A fabrication company plans to undertake the construction of a topside structure with a weight exceeding 19,000 tons. Based on the Soil Investigation Report, it was found that the foundation in the fabrication area was previously used for the construction of a structure weighing 17,500 tons. Based on the consideration of the weight of the structure, it is necessary to review whether the fabrication area is capable of carrying out the construction of the topside structure until loadout. During the analysis process, it was found that the soil bearing capacity of the fabrication yard was 6108.99 MT at row support A1, while the minimum soil bearing capacity during the fabrication to loadout process at row support A1 was 6776.08 MT. Thus, it is necessary to modify the loadout area. In the process of assessing the strength of the soil foundation against structural loads, a support planning model is also made that will be used to support the topside structure during the fabrication process and also in carrying out loadout. The suitability of the structure and support will affect the process of assessing the strength of the soil foundation in parsing the potential for failure. In the process of analyzing the topside structure and support, under settlement conditions in the fabrication stage, it was found that there was a member that experienced a high enough stress with a UC value of 0.984 in member 2807-2808 on the deck leg above the row support. This occurred because during the settlement condition, there was a shift in the weight point of the structure with a joint reaction value of 4246.72 MT at the row support. During the analysis process on the bearing capacity of the foundation, topside structure, and support structure, the percentage of structural failure before modification of the loadout area is 2.12%, which is included in the failure category because it has a value above 1%.
Tie-Braces Design Optimization of Breasting Dolphin Structure at Petrochina Marine Terminal Rudi Walujo Prastianto; Yoyok Setyo Hadiwidodo; Dyah Ayu Puspitorini
International Journal of Offshore and Coastal Engineering Vol. 1 No. 1 (2017)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v1i1.2868

Abstract

This paper discusses about optimization design of breasting dolphin’s structural strengthening with additional tie-bra­ces. The breasting dolphin structure has failed because of the increased load on the export activity of tanker. A strengthe­ning project has been carried out in 2014, but the result is considered overdesign and is not optimal. There­fore an optimization design of breasting dolphin structure is carried out as described herein, by looking for the optimum configuration, outside diameter, and wall thickness. The objective function is to determine the minimum weight of the structure. The independent variables are the outside diameter and wall thickness. The constraints are joint deflection check, member stress check, and joint punching shear stress check. There two type analyses performed. Firstly, in-place analysis of several structures with various tie-braces dimensions. The calcu­lation of the initial tie-braces dimension was performed using parameter’s design according to API RP 2A WSD. Secondly is optimization analysis of output data from the in-place evaluation to determine optimum outside diameter and wall thickness of tie-braces, also the weight of the structure. After optimization analysis conducted it is found optimum structural weight be 261 tons, which is some 3 tons lighter than the previous one of 264 tons.
Analitical Study of Vertical and Lateral Buckling on Pipeline Using Hobbs Method Yoyok Setyo Hadiwidodo; Herman Pratikno; Muhammad Makki Romadhoni
International Journal of Offshore and Coastal Engineering Vol. 1 No. 2 (2017)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v1i2.7058

Abstract

Analysis of Inspection Scheduling on Free Spanning Subsea Pipeline Using Risk Based Inspection (RBI) Method Daniel Mohammad Rosyid; Yoyok Setyo Hadiwidodo; Abizar Giffari
International Journal of Offshore and Coastal Engineering Vol. 4 No. 1 (2020)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i1.8703

Abstract

The subsea pipeline system of PT. X located at north of West Java transports natural gas with 19 kilometers long and 16 inches standard pipe size. The rough seabed causes free span problem. The system will be threatened by a structural failure of fatigue due to Vortex Induced Vibration (VIV) and local buckling as the effects of free span. In this Final Project, a total of 136 free spans on subsea pipeline system due to the uneven seabed are analyzed. The screening will be done for spans with length and diameter ratio more than 30 to figure out the free span which pass the screening and know the risk level of the subsea pipeline due to free span. The result for fatigue screening due to VIV, spans with a length more than 25 meters did not pass the screening. Local buckling occurred at the longest free span with a length of 62 meters. The level of risk to structural failure caused fatigue due to VIV has the highest level in terms of business and the environment, namely in the medium category. The level of risk to local buckling failures for safety, environmental, and business terms was in low category.
Trunnion Structure Analysis with Rigging Variations at The Loadout Stage During Lifting Jacket Platform Process Muhammad Faris Pramudiansyah; Yoyok Setyo Hadiwidodo; Handayanu
International Journal of Offshore and Coastal Engineering Vol. 9 No. 1 (2025)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j225800914.v9i1.4504

Abstract

An offshore structure is a structure that is operated at an offshore base and has the general function of oil and gas exploitation and exploration. The making process of this structure is called the fabrication process. Fabrication is the process which is covered the whole activities to produce the structure. Lifting is a process that is included in this fabrication step.Many important lifting items correspond to the requirement to let the lifting process is working. A trunnion is a tubular member that helps lift the structure because it is where slings can be convoluted. Trunnion can be called lifting lugs, depending on the engineer at the company used.In this research, the trunnion that must be analyzed is the trunnion that has the general function for the jacket-to-lifting processes. In contrast, the researcher analyzed the effect of various rigging configurations. The considered variable of rigging configuration is the shape and amount of the spreader bar.
Co-Authors Abizar Giffari Agus Juwarno Asta Razqi Damarjati Daniel Mohammad Rosyid Dendy Satrio Dyah Ayu Puspitorini Handayanu Handayanu Handayanu Hariono Hariono Hasan Ikhwani Herman Pratikno, Herman Muhammad Faris Pramudiansyah Muhammad Makki Romadhoni Muhammad Rizky Syarifudin Rudi Walujo Prastianto Sujantoko Sujantoko Widdi Umari