However, using barriers to keep the flammable cloud from dispersing too far downwind is likely to result in a larger volume of gas remaining near the release location and possibly within congested areas inside the facility. This may therefore increase the hazard footprint from the worst credible overpressure scenarios. Similarly, the flow obstruction posed by the barriers may decrease the air flow through the area increasing the overpressure hazard from smaller releases. Since small releases tend to occur more frequently, increasing their potential severity is likely to increase the overall risk to which facility personnel are exposed. Fortunately, not all barrier installations will have an adverse impact on overpressure hazard and/or personnel risk.
This paper will examine the impact of vapor barriers on overpressure hazards for different barrier configurations. The case study will apply CFD modeling to realistic scenarios, inside a detailed 3D model of a typical LNG liquefaction facility.
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