Strength assessment of stiffened blast walls in offshore installations under explosions

Sohn, Jung Min; Kim, Sang Jin; Seo, Jung Kwan; Kim, Bong Ju; Paik, Jeom Kee

doi:10.1080/17445302.2015.1035164

Cited by 17 publications

(4 citation statements)

References 11 publications

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“…APSs such as gas detectors and showdown systems are used to prevent accidents and PPSs such as water sprays, heat shields, fire and blast walls and passive fire protection (PFP) are used to address the consequences after the accidents. PPSs are usually preferred over APSs due to the latter's higher cost (Lei et al, 2015;Sohn et al, 2015), and the optimal placement of protection systems also influences their cost effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Methods for determining the optimal arrangement of water deluge systems on offshore installations

et al. 2016

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Offshore installations are prone to fire and/or explosion accidents. Fires have particularly serious consequences due to their high temperatures and heat flux, which affect humans, structures and environments alike. Due to the hydrocarbon explosions caused by delayed ignition following gas dispersion, fires can be the result of immediate ignition after gas release. Accordingly, it can be difficult to decrease their frequency, which is an element of risk (risk = frequency x consequence), using an active protection system (APS) such as gas detectors capable of shutting down the operation. Thus, it is more efficient to reduce the consequence using a passive protection system (PSS) such as water spray. It is important to decide the number and location of water deluge systems, thus the aim of this study is to introduce a new procedure for optimising the locations of water deluge systems using the water deluge location index (WLI) proposed herein. The locations of water deluge systems are thus optimised based on the results of credible fire scenarios using a three-dimensional (3D) computational fluid dynamics (CFD) tool. The effects of water spray and the effectiveness of the WLI are investigated in comparison with uniformly distributed sprays. Keywords 2 / 29 offshore installations, fire accidents, optimisation of water deluge systems, water deluge location index (WLI)

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Section: Introductionmentioning

confidence: 99%

Methods for determining the optimal arrangement of water deluge systems on offshore installations

et al. 2016

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“…As another example, a further study was conducted by Sohn et al (2016), investigating the effects of stiffeners to reduce the probability of having local failures. They concluded that a flat stiffener can be located in the buckling regions to improve the buckling strength of blast walls.…”

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confidence: 99%

Dynamic behaviour of unstiffened stainless steel profiled barrier blast walls

Hedayati

Sriramula

Neilson

2017

Ships and Offshore Structures

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Performing optimum design, reliable assessment or suitable verification for stainless steel profiled barrier blast wall structures requires dealing with various challenges, stemming from the associated uncertainties in material properties, fabrication, installation, and more importantly variations in the blast load characteristics. In the analysis, assessment, and design of these blast walls, one of the key areas to be appreciated and understood is the dynamic response of these structures. This paper presents a methodology developed for identifying the predominant structural behaviour and characteristics of profiled barrier blast wall structures, using a probabilistic approach. Twenty parametric base models are developed using Ansys and by implementing a Latin Hypercube Sampling (LHS) approach, the section properties of the models are represented in terms of probability distributions. A number of models are generated stochastically and modal analyses performed to identify the dynamic sensitivity of these models. The corresponding response classification of these structures is evaluated from the load duration and natural periods of the structures. The results of the study confirm that structural response, for the wide range of profiled blast walls analysed, is mainly quasi-static or static, as opposed to dynamic. In fact, dynamic effects are negligible for unstiffened

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“…Paik et al (2014) has introduced a new procedure for the nonlinear structural response analysis of offshore installations in explosions. Paik et al (2016) investigated hydrocarbon risks of hydrocarbon explosion and fire for offshore units. In addition, structural integrity against gas explosion have been investigated by Czujko and Paik (2015) and Sohn et al (2016).…”

Section: Introductionmentioning

confidence: 99%

“…Paik et al (2016) investigated hydrocarbon risks of hydrocarbon explosion and fire for offshore units. In addition, structural integrity against gas explosion have been investigated by Czujko and Paik (2015) and Sohn et al (2016). Eslami-Majd and Rahbar-Ranji (2015) has investigated the effect of corrosion on the structures against explosion.…”

Section: Introductionmentioning

confidence: 99%

Potential risk of vapour cloud explosion in FLNG liquefaction modules

et al. 2018

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This version is available at https://strathprints.strath.ac.uk/61716/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. still evolving and their safety has yet to be fully and objectively evaluated. This paper explores the probability of occurrence of accidents leading to vapour cloud explosion at one of the topside liquefaction modules of an FLNG. The worst possible scenario with the maximum tolerable probability is identified and the impact of the corresponding vapour cloud explosion is estimated. The strength of the structures supporting the neighbouring modules was examined using finite element analysis to determine if the accident has a potential of escalating to neighbouring modules. Potential Risk of Vapour Cloud Explosion in FLNG Liquefaction ModulesIt is found that the current levels of safety gaps between the liquefaction modules may be insufficient for the structural arrangement in place. It is thought that a new structural design using circular pipes as the structural elements instead of the I-beams may enhance the integrity of the top-side supporting structures against the impact of potential vapour cloud explosion. The effectiveness of the new structure is demonstrated by comparing it to the conventional supporting structure using I-beam members. This also implies that, by using pipe elements, the safety gaps can be reduced, thus making it possible to optimise the topside arrangement more easily.

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Strength assessment of stiffened blast walls in offshore installations under explosions

Cited by 17 publications

References 11 publications

Methods for determining the optimal arrangement of water deluge systems on offshore installations

Methods for determining the optimal arrangement of water deluge systems on offshore installations

Dynamic behaviour of unstiffened stainless steel profiled barrier blast walls

Potential risk of vapour cloud explosion in FLNG liquefaction modules

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