scholarly journals A Study on a Quantitative Analysis Method for Fire and Explosion Risk Assessment of Offshore Platforms

2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Zhaohui Shang ◽  
Huibin Yan ◽  
Weidong Ruan ◽  
Yong Bai
Keyword(s):  
Risk Assessment ◽  
Oil And Gas ◽  
Latin Hypercube Sampling ◽  
Assessment Method ◽  
Dispersion Analysis ◽  
Offshore Platform ◽  
Exceedance Probability ◽  
Offshore Platforms ◽  
Gas Explosion ◽  
Explosion Risk

Proper design of the explosion loads is of vital importance in the risk assessment of explosions for offshore oil and gas installations. A quantitative assessment method for gas explosion loads in process modules of offshore platform is proposed in this paper. The proposed approach achieves the following three objectives: (a) defining a suitable number of leak scenarios quantitatively based on the Latin Hypercube Sampling (LHS) technique and statistical analysis; (b) defining the explosion scenarios according to the computational fluid dynamics (CFD) dispersion analysis results in the sampled leak scenarios; (c) designing the explosion loads on interested areas according to the CFD analysis results in different explosion scenarios and exceedance probability methods. The proposed method was applied to a process module of an example offshore platform. The pressure loads on interested areas of the example platform are very close to that suggested in Det Norske Veritas (DNV) codes. The method developed in this paper can benefit the engineers on better assessment of gas explosion risk in process modules for offshore installations.

scholarly journals Study on fire risk assessment of offshore platforms

2021 ◽  
Vol 261 ◽  
pp. 03034
Author(s):  
Tao Chen ◽  
Lin Wang
Keyword(s):  
Risk Assessment ◽  
Oil And Gas ◽  
High Efficiency ◽  
Fire Risk ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Effective Prevention ◽  
Fire Risk Assessment ◽  
Oil And Gas Resources ◽  
Offshore Oil And Gas

As a modern infrastructure for offshore oil and gas resources development, offshore platforms have many advantages, such as high efficiency, concentration, flexibility, and repeatability. At the same time, its upper module environment is bad, the equipment is numerous, has the very big risk. In case of fire and explosion and other accidents, it is difficult to get timely rescue. Therefore, fire risk assessment for offshore platform is very necessary. This paper focuses on the research results in the field of fire risk assessment of offshore platforms at home and abroad, points out the shortcomings of current research, and provides reference for risk reduction and effective prevention of offshore platform operations.

scholarly journals A Critical Review of the Equivalent Stoichiometric Cloud Model Q9 in Gas Explosion Modelling

Eng ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 156-180
Author(s):  
Vincent Tam ◽  
Felicia Tan ◽  
Chris Savvides
Keyword(s):  
Risk Assessment ◽  
Risk Management ◽  
Large Scale ◽  
Cloud Model ◽  
Real Life ◽  
Published Data ◽  
Gas Explosion ◽  
Full Account ◽  
Evaluation Protocol ◽  
Explosion Risk

Q9 is widely used in industries handling flammable fluids and is central to explosion risk assessment (ERA). Q9 transforms complex flammable clouds from pressurised releases to simple cuboids with uniform stoichiometric concentration, drastically reducing the time and resources needed by ERAs. Q9 is commonly believed in the industry to be conservative but two studies on Q9 gave conflicting conclusions. This efficacy issue is important as impacts of Q9 have real life consequences, such as inadequate engineering design and risk management, risk underestimation, etc. This paper reviews published data and described additional assessment on Q9 using the large-scale experimental dataset from Blast and Fire for Topside Structure joint industry (BFTSS) Phase 3B project which was designed to address this type of scenario. The results in this paper showed that Q9 systematically underpredicts this dataset. Following recognised model evaluation protocol would have avoided confusion and misinterpretation in previous studies. It is recommended that the modelling concept of Equivalent Stoichiometric Cloud behind Q9 should be put on a sound scientific footing. Meanwhile, Q9 should be used with caution; users should take full account of its bias and variance.

Structural Health Monitoring of An Offshore Platform Trend of Corrosion and Marine Growth With Predictive Maintenance

2020 ◽  
Author(s):  
K. S. Suharto
Keyword(s):  
Structural Health Monitoring ◽  
Data Processing ◽  
Production Process ◽  
Health Monitoring ◽  
Oil And Gas ◽  
Gas Production ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Oil And Gas Production ◽  
Potential Failure

Nowadays, there are a lot of oil and gas exploration activities all over the world, especially offshore. Oil and gas production itself has many supporting factors in the production process, of which one of them is the offshore platform. Over time, the offshore platform will experience a degradation in strength from the initial design, therefore offshore platforms need to carry out appropriate inspection, maintenance and repair (IMR) programs so that the offshore platform does not reach critical conditions and disrupt the oil and gas production process, resulting in significant losses and not achieving the planned production rates. The offshore platform design is a combination of steel structure and other materials, methods, and loads that are initially worked at the port, such as wave loads, currents, and several other parameters such as gravity, wind, and earthquake. Most of the offshore platforms that currently exist (worldwide) were made in the period of oil investment that developed between 1970 and 1980, thus, the platform's age has now reached 40 to 50 years (El-Reedy, 2012). This research data based on a platform in the Makassar strait between the islands of Kalimantan and Sulawesi. The method used in this research is the platform's design, data observation, data analysis, data processing, and statistical multilinear regression analysis. This research is investigating the degradation trend of the offshore platform and predicting the future of potential failure because of corrosion and marine growth. After the platform encounters degradation over several years, it will decrease the service life before the degradation starts to matter. The results show after data processing that, offshore platforms encounter degradation over several years, and it is presented by a graph containing the condition trend over a multi-year condition because of corrosion and marine growth, and its effect towards unity check (UC) that define structure health. Unity check value produced from allowable stress versus capacity. In this research, structural health monitoring is predicting the potential failure of the platform towards its UC effect of corrosion and marine growth, with a max of the UC value is 0.8 because its a critical value. The failure of the structure possibly would have an affect on the cost-effectiveness. Therefore it is necessary to predict when the structure will fail so that the costs used are effective. Unfortunately, there is no core data for the environmental changes every year at the platform, so the model's equation does not include environmental conditions.

Deformation Monitoring of Offshore Platform Using the Persistent Scatterer Interferometry Technique

2014 ◽  
Vol 567 ◽  
pp. 325-330 ◽  
Author(s):  
Abdul Nasir Matori ◽  
Amir Sharifuddin Ab Latip ◽  
Indra Sati Hamonangan Harahap ◽  
Daniele Perissin
Keyword(s):  
Structural Integrity ◽  
Oil And Gas ◽  
Deformation Monitoring ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Persistent Scatterer Interferometry ◽  
Reservoir Compaction ◽  
Persistent Scatterer ◽  
Deformation Velocity ◽  
Global Positioning

One of the problems that occur during the exploitation of oil and gas is offshore platform deformation. It could occur due to the environments load as well as the extraction of oil and gas itself under the seabed that caused reservoir compaction. Offshore platform deformation may affect the platform structural integrity and cause loss of production, thus it is very important to monitor its occurrences. Offshore platform deformation monitoring has been carried out using the satellite-based Global Positioning System (GPS) technique until recently. Even though the technique has proven its worth for the job, it has however some limitations, the most prominent is it could only monitor selected portion of the offshore platform. Thus, this study presents an attempt of detecting and monitoring the deformation phenomenon of an offshore platform using the Persistent Scatterer Interferometry (PSI) technique. This technique would overcome some of the limitations of the previous (GPS) deformation monitoring technique. A total of 11 high resolution TerraSAR-X images (i.e., 3 m in StripMap mode) were acquired from Aug, 2012 to Apr, 2013 for this purpose, while one of the offshore platforms in South China Sea is being used as monitored platform. Preliminary results showed that detail and sensitive deformations could be detected by this technique. In addition, analysis results in the form of mean deformation velocity map and displacement time series would allow us to further understand the behaviour of offshore platform deformation.

scholarly journals Causes and Consequences of Fire Emergencies on Oil and Gas Platforms

2021 ◽  
Vol 11 (2) ◽  
pp. 1253-1258
Author(s):  
Elkhan Jafarov
Keyword(s):  
Risk Assessment ◽  
Fire Safety ◽  
Oil And Gas ◽  
Gas Production ◽  
Offshore Platform ◽  
Operating Conditions ◽  
Oil And Gas Production ◽  
Offshore Oil And Gas ◽  
Offshore Oil

This study presents an analysis of the causes and consequences of the largest offshore platform accidents associated with oil and gas production. The research on this problem allows improving the reliability of risk assessment associated with offshore oil and gas production, as well as developing methods for improving the fire safety of oil and gas platforms under various operating conditions.

Structural Safety Analyses for Offshore Platforms Under Explosion Loadings

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Yonghee Ryu ◽  
Bassam Burgan ◽  
Jaewoong Choi ◽  
Heesung Lee
Keyword(s):  
Structural Response ◽  
Time History ◽  
Structural Safety ◽  
Offshore Platforms ◽  
Structural Elements ◽  
Gas Explosion ◽  
Lagrangian Analysis ◽  
Safety Critical ◽  
Compression Waves ◽  
Explosion Risk

A gas explosion in an offshore platform may result in loss of life, pollution, and critical damage to facilities. Safety critical structural elements of these facilities have to be designed to withstand high explosion loads. The present study discusses methodologies for explosion risk assessment (ERA) of safety critical structural elements and introduces a coupled Eulerian–Lagrangian (CEL) method to improve the accuracy of the dynamic structural response under explosion loading. The design accidental load is defined by explosion risk analyses in terms of drag pressure, differential pressure, and overpressure. In current practice, an explosion pressure-time history is simplified into a triangular shape and uniformly applied to the surface of the impacted structures. This approach cannot account for the interaction between elastic waves (normally solved by the Lagrangian method) in the structure and compression waves (normally solved by the Eulerian method) in air. The CEL method which accounts for fluid–structure interaction has been experimentally validated and leads to more realistic predictions of the dynamic response of structures when compared to other analysis methods. The plastic strains derived from the CEL analysis can be approximately 50% lower than those predicted by Lagrangian analysis. Therefore, significant potential weight reduction can be achieved using the CEL method for gas explosion analysis.

Online Measurement and Quick Replacement of Pipeline Segments in an Offshore Platform

2011 ◽  
Vol 261-263 ◽  
pp. 1406-1409 ◽  
Author(s):  
Shi Liang Zhang ◽  
Jin Yan
Keyword(s):  
Oil And Gas ◽  
Economic Benefits ◽  
Offshore Platform ◽  
Gas Pipeline ◽  
New Method ◽  
Online Measurement ◽  
Offshore Platforms ◽  
Pressure Test ◽  
Great Progress ◽  
Long Time

Due to the effect of deterioration and corrosion, large amounts of oil and gas pipeline segments need to be replaced in offshore platforms every year. By using traditional reconstruct method, it needs to stop production in offshore platform firstly, then follows insulation, backout, baiting, jointing, installation, pressure test for tightness, etc. This process will take a long time and much work, and it will greatly influence the regular manufacture of oil and gas. In this work, a new method is introduced that oil and gas pipeline segments are replaced without stopping production. The technology includes precisely measuring geometry dimension of the oil and gas pipeline segments to be replaced, making prefabricate replacement segments exactly offline, and replacing the pipeline segments on site in a speedy and safety way. Last, an engineering applications case is given to show the whole detail process. It proves that the technology not only makes great progress in pipeline reconstruction, but also results in good social and economic benefits.

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