scholarly journals Investigating Vapour Cloud Explosion Dynamic Fatality Risk on Offshore Platforms by Using a Grid-Based Framework

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 685
Author(s):  
Usama Muhammad Niazi ◽  
Mohammad Shakir Nasif ◽  
Masdi Muhammad ◽  
Faisal Khan
Keyword(s):  
Risk Analysis ◽  
Well Being ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Plant Design ◽  
Maximum Increase ◽  
Fatality Risk ◽  
Dynamic Risk ◽  
Vapour Cloud ◽  
Grid Based

The reliability of petroleum offshore platform systems affects human safety and well-being; hence, it should be considered in plant design and operation in order to determine its effect on human fatality risk. Methane Vapour Cloud Explosions (VCE) in offshore platforms are known to be one of the fatal potential accidents that can be attributed to failure in plant safety systems. Traditional Quantitative Risk Analysis (QRA) lacks in providing microlevel risk assessment studies and are unable to update risk with the passage of time. This study proposes a grid-based dynamic risk analysis framework for analysing the effect of VCEs on the risk of human fatality in an offshore platform. Flame Acceleration Simulator (FLACS), which is a Computational Fluid Dynamics (CFD) software, is used to model VCEs, taking into account different wind and leakage conditions. To estimate the dynamic risk, Bayesian Inference (BI) is utilised using Accident Sequence Precursor (ASP) data. The proposed framework offers the advantage of facilitating microlevel risk analysis by utilising a grid-based approach and providing grid-by-grid risk mapping. Increasing the wind speed (from 3 to 7 m/s) resulted in maximum increase of 21% in risk values. Furthermore, the integration of BI with FLACS in the grid-based framework effectively estimates risk as a function of time and space; the dynamic risk analysis revealed up to 68% increase in human fatality risk recorded from year one to year five.

scholarly journals Integrated Consequence Modelling for Fire Radiation and Combustion Product Toxicity in offshore Petroleum Platform using Risk Based Approach

2018 ◽  
Vol 225 ◽  
pp. 06013
Author(s):  
Usama Muhammad Niazi ◽  
Mohammad Shakir Nasif ◽  
Masdi Bin Muhammad ◽  
Muhammad Imran
Keyword(s):  
Combustion Product ◽  
Emergency Preparedness ◽  
Current Approach ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Fire Dynamics ◽  
Toxic Gases ◽  
Flash Fire ◽  
Thermal Radiations ◽  
Grid Based

The processing area of offshore platform has high probability of leakage of hydrocarbons. Liquefied Natural Gas (LNG) is one of the most common hydrocarbon produced in offshore platforms. Leakage of LNG can cause pool fire, jet fire, flash fire or fire ball. Thermal radiations due to fire is the major source of damage to workers on board. But due to fire, various combustion product toxic gases are also produced that have both acute and chronic health effects. These toxic gases can cause incapacitation, increased heart rate, vomiting and even death. Predicting the human injury due to thermal radiations and concentration of toxic gases are the key issues. A risk based approach takes in to consideration the duration a worker spent on different location of offshore platform and also it has the additive ability to evaluate overall risk due to fire radiation and toxic gases. Grid based approach helps in better visualization of risk posed by fire radiation and combustion product toxic gases at different locations of platform. The current study proposed an integrated consequence modelling approach for fire and combustion product toxic gases using risk based and grid based approaches. The integrated accident is modelled using Computational Fluid Dynamics (CFD) code Fire Dynamics Simulator (FDS). The results showed that risk posed by thermal radiation is confined on sub cellar deck (lower deck) but estimated risk due to combustion product gas (carbon monoxide) on cellar deck (upper deck) has significant value that needs to be considered. The current approach would be useful for emergency preparedness plans and safety measures designs for offshore platforms.

Installation of Long Span Boat Landing on Float Over Platforms - A Case Study

2021 ◽  
Author(s):  
Charles John George ◽  
Cibu Varghese ◽  
Faris Ragheb Kamal
Keyword(s):  
Production Process ◽  
Energy Absorption ◽  
Arabian Gulf ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Long Span ◽  
Heavy Lift

Abstract Fixed offshore platforms are normally provided with landing platforms that enable berthing of supply vessels, crew boats etc. These landing platforms or ‘Boat landings’ are energy absorption structures provided on substructures (jackets) of offshore platforms. Their purpose is to facilitate personnel access from vessel to platforms for performing various tasks including manning the platform, its maintenance etc. Vessel also approach the platforms for providing supplies in case of a manned platform and for providing bunkers, spares etc. As such, boat landing is an integral part of offshore platform and its design and installation becomes equally important. They are preferably located at leeward direction as far as practical, to avoid accidental vessel drift into the platform. For smaller standalone offshore platforms installed with Heavy Lift Crane Vessels, boat landing is installed after the jacket is piled to seabed. Since sequence of installation of boat landing is prior to that of Topside, such installations are straightforward and without obstructions from the Topside. For the bigger accommodation, production, process platforms located in super-complex (or standalone) with topsides installed by float over method, boat landings sometimes are in the wide float over barge slots. In such cases, installation of boat landing becomes very critical due to the post installation after the Topside and associated obstructions from the Topside. This is similar or more critical than a boat landing removal / refurbishment activity carried for a brownfield project. This paper explores the challenges and associated steps adopted to execute the safe installation of these critical structures underneath a newly installed Topside. This case study details the installation of ∼300mt boat landings onto recently installed Greenfield platforms in Arabian Gulf using efficient rigging, suiting the EPC Contractors’ crane assets.

Morphogenetic Updating Algorithm and its Application in Updating Probabilistic Risk

2019 ◽  
Vol 33 (07) ◽  
pp. 1950008
Author(s):  
Jing Tian ◽  
Germano Resconi
Keyword(s):  
Risk Analysis ◽  
Structural Information ◽  
Guangdong Province ◽  
Special Problem ◽  
Internal Source ◽  
The Core ◽  
Dynamic Risk ◽  
New Information ◽  
Cosine Similarity Measure ◽  
Probabilistic Risk

The problem of risk update is one of the core problems of dynamic risk analysis. As for updating widely used probabilistic risk, it’s a kind of special problem of pattern recognition which means to transfer from old pattern to new pattern with new information. Aiming at updating probabilistic risk only with the new observations and without the original observations, this paper proposes the morphogenetic updating algorithm to update the probabilistic risk with only new observations and old risk values by reproducing the morphogenesis of new observations and old risk values based on morphogenetic estimation. The form rules hidden in the risk values and new observations are discovered by internal source in Write operation, and the projection of the input and the cosine similarity measure as the basis for defining the weight of updating are computed in Read operation. Based on Resconi theorem, the input is reproduced by its projection on the context which provides the same mathematical space for updating and stores the structural information hidden in the risk. By applying the algorithm to updating the probabilistic risk of typhoon rainstorms occurred in Guangdong Province, it proves that morphogenetic updating algorithm provides us a method to updating probabilistic risk fast and satisfactorily and it’s a sustainable updating method which can be used for dynamic risk analysis.

Application of dynamic risk analysis in offshore drilling processes

2020 ◽  
Vol 68 ◽  
pp. 104326
Author(s):  
Bijay B ◽  
Priscilla George ◽  
V.R. Renjith ◽  
Anish Job Kurian
Keyword(s):  
Risk Analysis ◽  
Offshore Drilling ◽  
Dynamic Risk

Dynamic risk analysis of offloading process in floating liquefied natural gas (FLNG) platform using Bayesian Network

2016 ◽  
Vol 41 ◽  
pp. 259-269 ◽  
Author(s):  
ChuiTing Yeo ◽  
Jyoti Bhandari ◽  
Rouzbeh Abbassi ◽  
Vikram Garaniya ◽  
Shuhong Chai ◽  
...  
Keyword(s):  
Natural Gas ◽  
Risk Analysis ◽  
Bayesian Network ◽  
Liquefied Natural Gas ◽  
Dynamic Risk
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