Defining Spray Requirements for Mitigation

The analysis for the single spray can be extended to curtains by using an aggregate surface area and water flow rate. An expression relating A, the spray area, to z, the axial distance, is required. This simple theoretical model can be modified to predict the spray envelope as well. 

Water sprays are simple, reliable, and inexpensive and can be either fixed or mobile. However, their effective use for protection requires careful evaluation of credible release rates, release durations, chemical characteristics, spray hydrodynamics, and mass transfer. The efficiency of a water-spray system is a function of the following  

Before designing a spray system to mitigate spills of toxic and/or flammable materials, design requirements should be defined. One method of doing this is to  

Define potential scenario, chemical properties, source geometry, and atmospheric conditions, which can affect the width of the cloud, the effect of obstacles on the cloud and the impact of the water sprays themselves  

Calculate hazard zones using well-established and validated hazard models, using experimental data or previous incident data when available  

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