Modélisation de l'impact de projectiles sur des installations voisines : couplages mécano-probabiliste

National audienceLes projectiles engendrés lors d'une explosion d'un réservoir sont des menaces pour d'autres équipements environnants et peuvent entraîner des explosions successives

The domino effect and integrated probabilistic approaches for risk analysis

International audienceThe paper develops a probabilistic approach in order to deal with domino effects that may occur in industrial facilities : an explosion or accident may generate various sets of projectiles that may impact other existing facilities (tanks under high-pressure, etc) and may generate other sets of projectiles and so on. Three main parts are considered : 1- Source term : for the first set of generated projectiles, probabilistic distributions are considered for the number, masses, velocities, departure angles, geometrical form, dimensions, and constitutive materials properties. The authors have collected existing models from the literature. 2- Target term : for the set of impacted targets, probabilistic distributions are considered for the number of impacting projectiles, velocities, incidence angles and energy at impact, constitutive materials properties, dimensions of the impacted targets, and projectiles penetration depths into the targets. In this paper, new models for the impact are proposed to calculate the penetration depth after impact : case of cylindrical rods impacting rectangular plates, both are metal made. The theoretical results are compared to the experimental data (4 data sets) collected from the literature with the following features : projectiles mass ranging from 0.1g up to 250 kg, projectiles velocity ranging from 10 m/s up to 2100 m/s, projectiles diameters ranging from 1.5 mm up to 90 mm, target strength ranging from 300 MPa up to 1400 MPa and incidence angles ranging from 0 degree up to 70 degrees. 3- Domino effect term : evaluation of the risks of second set of explosions that may take place in the impacted components. Monte Carlo simulations are used in order to calculate the different probabilities : probability of impact, distribution of the penetration depth and probability of domino effect

Méthodologies d’évaluation de la sûreté des structures vieillissantes - panorama et benchmarking

The assessment of the safety of aging structures is mandatory to ensure appropriate operations of industrial systems. The needs of coherent and adapted methodology become more and more significant in various engineering fields, knowing the large number of equipment and their actual ages, on one hand, and the limitations of re-investment capacity, on the other hand. The project IMdR P10-2: “Methodologies of safety assessment of aging structures – panorama and benchmarking”, to which seven subscribers have participated: AMETHYSTE, BUTAGAZ, CETIM, EDF, INERIS, RTE and SNCF, has as an object to identify the existing scientific methodologies, which are applied in different industrial fields, in order to highlight the main concepts, and the requirements in terms of data and skills. For each family, the level of uncertainty control and the risk consideration are identified. A benchmark composed of three industrial examples (atmospheric tank, pressurized pipe and steel structure), based on real data, is established for comparison of the different methodologies, in terms of data acquisition, uncertainty analysis and risk consideration in managing and monitoring the state of the structures.L’évaluation de la sûreté des structures vieillissantes est essentielle pour assurer le bon fonctionnement des installations et des systèmes industriels. Le besoin d’une méthodologie cohérente et adaptée se ressent de plus en plus dans différents secteurs d’ingénierie, étant donné le nombre important d’équipements actuels et de leur âge, d’une part, et les limitations de la capacité de réinvestissement, d’autre part. Le projet IMdR P10-2 : « Méthodes d’évaluation de la sûreté des structures vieillissantes – Panorama et benchmarking », auquel sept souscripteurs ont participé : AMETHYSTE, BUTAGAZ, CETIM, EDF, INERIS, RTE et SNCF1, a pour objet d’identifier les méthodologies scientifiques existantes et utilisées dans des secteurs industriels variés, d’en dégager les concepts fondamentaux et les besoins en termes de données et de compétences. Pour chaque famille de méthodes, le degré de maîtrise des incertitudes et la façon de prendre en compte le risque sont identifiés. Un benchmark composé de trois exemples industriels (réservoir atmosphérique, conduite forcée et structure métallique), s’appuyant sur des données réelles, est établi pour la comparaison des différentes méthodologies, en termes d’acquisition de données, d’analyse d’incertitude et d’intégration du risque pour le suivi et la remise en état des structures

Etude du risque d'explosion d'un réservoir - Cadre et contribution du projet ANR Vulcain

National audienc

Integrated probabilistic framework for domino effect and risk analysis

International audienc

Impact des projectiles sur des équipements industriels

National audienc

Etude de l'impact des projectiles sur des équipements industriels

National audienc

A monte-carlo method used to study the fragment impact effect on the industrial facilities

International audienceThe generated fragments due to the explosion of vessel under pressure may be threats to the surrounding equipments at the impact. The fragment characteristics are number, shape, mass, departure angles, departure velocity. These characteristics are considered as uncertain variables. The authors propose the probability distribution for each variable. A fragment trajectory model concerning its shape is then presented in order to study the impact problem. The numerical simulations using the Monte-Carlo method allow calculating the probability of impact, Pimp between fragments and surrounding equipments