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Analysis of the Effect of Welding Sequence Variations on Residual Stresses and Distortions for Welding Pressure Vessels Structures at PT. Petrokimia Gresik using the Finite Element Method Nur Syahroni; Bayu Iman Fatkurokhim; Handayanu Handayanu
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 2 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

The development of oil and gas industry technology has been very advanced, one of the implementation is to connect material materials to support oil and gas industry facilities. Residual stress may occur due to high temperature differences due to welding and also uneven heat distribution. This causes the material to become hard but brittle so that it may cause structural failure in the connection area. In this final project will be simulated welding pressure vessels to determine the structure of residual stresses that occur as well as the influence of Post Weld Heat Treatment on residual stress itself. The material used is aluminum and WPS data coming from the fabrication company. The simulation is divided into 2 steps: thermal and structural analysis. The value of the residual voltage of 1 to pathline pathline 3 is 189 MPa, 124.8 MPa, 100.76 MPa with distortion value of 40.43 mm. Then analyzed Post Weld Heat Treatment referring to AWS D1.1: 2000 to reduce residual stresses that occur. From the results of the Post Weld Heat Treatment value of the residual stress can be reduced significantly. After being treated Post Weld Heat Treatment with variations of temperatures of 200 C, 300 C The maximum residual voltage reduction occurs in pathline 1 to pathline 3 at 125 MPa, 93 MPa, 100 MPa.

Analysis of Residual Fatigue Life on Jacket Platform Structure Due to Subsidence Effect As Achmad Daffa Dhiya’udien Munaf; Nur Syahroni; Handayanu
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.v10i1.9921

Many oil and gas platforms in Indonesian waters, both those still operating and those that have passed the operating life limit (expired), experience subsidence events, especially in the jacket platform structure. Subsidence around these platforms is caused by massive oil and gas exploitation in producing hydrocarbon reservoirs. This phenomenon poses a risk due to intolerable wave loads, where the waves increase the risk of structural failure, which can impact platform operations. Changes in seabed conditions due to subsidence will also affect the cyclical wave loads received by the platform jacket structure. In this Final Project, the author will analyze the residual fatigue life of the jacket platform structure due to subsidence. This Final Project research aims to analyze the effect of subsidence on the fatigue life of the jacket platform structure. Tests were carried out using cumulative damage and fracture mechanics methods to predict the failure time of the components reviewed in the jacket platform structure under non-subsidence conditions and when subsidence occurs. The analysis results show that the fatigue life of the structure will be reduced when subsidence occurs. With the cumulative damage method, the fatigue life value of the non subsidence condition is 279 years, while the residual fatigue life of the structure in the subsidence condition is 59 years. Meanwhile, using the fracture mechanics method, the value of the fatigue life of the non-subsidence condition is 76 years, and the residual fatigue life of the structure in the subsidence condition is 41 years. These results show a significant decrease in the fatigue life of the structure.

Dynamic Lateral Stability Analysis On Pipeline Under Operating Conditions Soni Fachryan Akbar; Yeyes Mulyadi; Nur Syahroni
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.v9i2.8926

The stability analysis of underwater pipelines refers to DNVGL RP F109 [3] (On-bottom Stability Design of Submarine Pipelines) and DNVGL RP F114 [2] (Pipe Soil Interaction) from 2017. The selection of analysis methods depends on the required level of detail in the design analysis. Dynamic analysis introduces more complexity in terms of numerical calculations and field conditions. It involves simulating the pipe's response to hydrodynamic loads, including random waves, steady currents, and soil resistance in the time domain to replicate extreme conditions realistically. The study's outcomes demonstrate that hydrodynamic forces analyzed through numerical methods in CFD software can be compared to analytical approaches outlined in DNV GL F109 and F114 with an error margin of less than 10%. The Maximum Lateral Displacement is measured at 86.49 mm, falling within the allowable displacement range of 0.5 – 10 times the pipe's outer diameter, as specified in DNV GL F109 & DNVGL F114 guidelines. The Von Mises Stress along the pipeline reaches 266.18 MPa, satisfying the 90% SMYS criteria stipulated in ASME B31.8 [2]

Analysis of the Effect of Welding Sequence Variations on Residual Stresses and Distortions for Welding Pressure Vessels Structures at PT. Petrokimia Gresik using the Finite Element Method Nur Syahroni; Handayanu Handayanu; Bayu Iman Fatkurokhim
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.v1i2.7053

The development of oil and gas industry technology has been very advanced, one of the implementation is to connect material materials to support oil and gas industry facilities. Residual stress may occur due to high temperature differences due to welding and also uneven heat distribution. This causes the material to become hard but brittle so that it may cause structural failure in the connection area. In this final project will be simulated welding pressure vessels to determine the structure of residual stresses that occur as well as the influence of Post Weld Heat Treatment on residual stress itself. The material used is aluminum and WPS data coming from the fabrication company. The simulation is divided into 2 steps: thermal and structural analysis. The value of the residual voltage of 1 to pathline pathline 3 is 189 MPa, 124.8 MPa, 100.76 MPa with distortion value of 40.43 mm. Then analyzed Post Weld Heat Treatment referring to AWS D1.1: 2000 to reduce residual stresses that occur. From the results of the Post Weld Heat Treatment value of the residual stress can be reduced significantly. After being treated Post Weld Heat Treatment with variations of temperatures of 200 C, 300 C The maximum residual voltage reduction occurs in pathline 1 to pathline 3 at 125 MPa, 93 MPa, 100 MPa.

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