An LPG pipeline break flow model has been develped to evaluate the flammability hazards associated with a pipeline rupture. The model estimates the time-dependent flow rate of LPG from a pipeline rupture, the gravity spreading of the LPG vapor layer over the ground, and the dispersion of the vapor cloud downwind of the break location. Examples of model predictions are presented to illustrate the effects of pipeline isolation valve spacing, and shutdown reaction time on the flammable cloud boundaries that could result from a partial break in a propane pipeline.

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