Experimental analysis of jet fire impingement on industrial pipe

Abstract : In industrial plants, jet fires and pool fires can increase hazards when they impinge and engulf on pipes or vessels. Then, these structures may also become themselves the centre of major accidents (domino effects). Therefore, as part of hazard surveys and more particularly survey of domino effects, some questions are asked about, for example: the relevance to consider the explosion of such or such tank as a result of the contribution of heat since a close fire considered besides, or again the quantitative contribution expected by the implementation of materials of heat insulation or the implementation of means of cooling. Thus a research program supported by the French Ministry for Ecology and Sustainable Development focuses on the thermal impact of fires on industrial pipes and tanks. Its main objective is to develop, to validate and to produce one or several tools of calculation satisfying needs mentioned above. This paper presents an experimental campaign aiming to the analysis of the heat transfers exerting on a pipe impinged by a jet fire. Thus, an experimental apparatus was set up making it possible to determine on the one hand, precisely the characteristics of jet fire and on the other hand, the thermal response of the steel pipe crossed by water flow. First of all, to characterise jet fire, measurements of gas temperatures, gas velocities and heat fluxes are performed for three gases that are the methane, propane and ethylene and for various gas release rates. Additionally, test monitoring has also been done with video camera. These measurements make it possible to define dimensions of jet fires, its surface emissive power as well as the hot gas velocities for finally deducing the heat transfers received by the pipe. The experimental data are compared with the SHELL model which is a semi-empirical model (Chamberlain, 1987) modified by Cook (1987). In the second time, the pipe crossed by cold water is subjected to these various jet fires and the thermal response of pipe is quantified by monitoring the pipe with thermocouples. This second test campaign aims to quantify the influence of the hot soot conduction in the heat transfers.
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Stéphanie Patej, Thierry Durussel. Experimental analysis of jet fire impingement on industrial pipe. 11. International Interflam Conference, Sep 2007, Londres, United Kingdom. pp.1389-1395. ⟨ineris-00976194⟩

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