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NOTE: This is an unformatted excerpt from our online fire protection training library.

Hydraulic Calculations

Exposure Protection

This is a very specific application.  An example would be the outside storage of pallets along the side of a building that has masonry walls, with windows at the eave.  If a fire breaks out in the pallet stack, the heat will soon be in the building through the eave windows.  One option to reduce the "exposure" to the building represented by the pallet storage is to move them; a second is to close up the windows at the eave line.  Both of these come with issues - maybe there is no place to move the pallets; and closing the eave windows darkens the building too much, and these windows may also be used for ventilation.

So, in order to reduce the fire exposure to the inside of the building, a line of sprinklers will be used to impinge water, or wash the windows, so that any heat developed is carried away from the glass using the water flow from the nozzles or sprinklers installed outside, just above the windows, at the eave of the building.  In warmer climates, these can be closed sprinklers, but in colder climates, these will be dry pipe systems, or Open head deluge water spray exposure systems.

Open head deluge water spray exposure systems may be the choice of most people, but this is based on the severity of the exposure.  Pallets, or flammable liquids stored along side the building will most likely dictate a quick application of water, so a deluge system is used.  If the exposure is less, perhaps closed sprinklers will do.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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