Gas explosion is a rare but severe event on offshore production facilities. Its impact is a severe load on the structure. This paper identifies the key characteristics of these forces and factors governing the severity of an explosion, and examines the effects of the direct over-pressure loading generated by an offshore explosion on walls, floors and ceilings. The gases venting from the explosion can also generate high drag loads on equipment, pipe work, structural elements etc. sited in the vent areas. Two cases are considered, a module where the dominant loading effects are due to the direct over-pressure and an FPSO where the drag load has a considerable effect on equipment on the deck. This paper discusses the two types of loading mechanism, also the range of analysis methods available to the designer is considered from a simple quasi-static approach to a sophisticated finite element model. Finally, the structural response implications of the variability of the pressure-time histories obtained from both CFD simulations and full scale tests is discussed with a view to setting a design value for blast over-pressures.
Gas explosion effects on offshore structures
1998
5 Seiten, 8 Quellen
Aufsatz (Konferenz)
Englisch
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